Use null safety library.

briar-android/src/androidTest/java/org/briarproject/briar/android/ScreenshotOnFailureRule.java

@@ -1,6 +1,6 @@
 package org.briarproject.briar.android;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.nullsafety.NotNullByDefault;
 import org.junit.rules.TestRule;
 import org.junit.runner.Description;
 import org.junit.runners.model.Statement;

briar-android/src/androidTest/java/org/briarproject/briar/android/UiTest.java

@@ -5,9 +5,9 @@ import android.content.Intent;
 
 import org.briarproject.bramble.api.account.AccountManager;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.settings.SettingsManager;
 import org.briarproject.briar.R;
+import org.briarproject.nullsafety.NotNullByDefault;
 import org.junit.ClassRule;
 
 import javax.inject.Inject;

briar-android/src/androidTestOfficial/java/org/briarproject/briar/android/attachment/media/PngSuiteImageCompressorTest.java

@@ -13,8 +13,8 @@ import java.util.logging.Logger;
 import androidx.test.filters.LargeTest;
 
 import static java.util.logging.Logger.getLogger;
-import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
 import static org.briarproject.bramble.test.TestUtils.isOptionalTestEnabled;
+import static org.briarproject.nullsafety.NullSafety.requireNonNull;
 import static org.junit.Assert.fail;
 import static org.junit.Assume.assumeTrue;
 

briar-android/src/androidTestOfficial/java/org/briarproject/briar/android/attachment/media/PngSuiteImageSizeCalculatorTest.java

@@ -15,8 +15,8 @@ import java.util.logging.Logger;
 import androidx.test.filters.LargeTest;
 
 import static java.util.logging.Logger.getLogger;
-import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
 import static org.briarproject.bramble.test.TestUtils.isOptionalTestEnabled;
+import static org.briarproject.nullsafety.NullSafety.requireNonNull;
 import static org.junit.Assume.assumeTrue;
 
 @LargeTest

briar-android/src/main/java/org/briarproject/briar/android/AndroidDatabaseConfig.java

@@ -2,7 +2,7 @@ package org.briarproject.briar.android;
 
 import org.briarproject.bramble.api.crypto.KeyStrengthener;
 import org.briarproject.bramble.api.db.DatabaseConfig;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.File;
 

briar-android/src/main/java/org/briarproject/briar/android/AndroidKeyStrengthener.java

@@ -4,7 +4,7 @@ import android.security.keystore.KeyGenParameterSpec;
 
 import org.briarproject.bramble.api.crypto.KeyStrengthener;
 import org.briarproject.bramble.api.crypto.SecretKey;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.IOException;
 import java.security.GeneralSecurityException;

briar-android/src/main/java/org/briarproject/briar/android/AndroidNotificationManagerImpl.java

@@ -21,8 +21,6 @@ import org.briarproject.bramble.api.lifecycle.ServiceException;
 import org.briarproject.bramble.api.mailbox.MailboxStatus;
 import org.briarproject.bramble.api.mailbox.event.MailboxProblemEvent;
 import org.briarproject.bramble.api.mailbox.event.OwnMailboxConnectionStatusEvent;
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.settings.Settings;
 import org.briarproject.bramble.api.settings.SettingsManager;
 import org.briarproject.bramble.api.settings.event.SettingsUpdatedEvent;
@@ -46,6 +44,8 @@ import org.briarproject.briar.api.conversation.ConversationResponse;
 import org.briarproject.briar.api.conversation.event.ConversationMessageReceivedEvent;
 import org.briarproject.briar.api.forum.event.ForumPostReceivedEvent;
 import org.briarproject.briar.api.privategroup.event.GroupMessageAddedEvent;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import java.util.Set;
 import java.util.concurrent.Callable;

briar-android/src/main/java/org/briarproject/briar/android/AppModule.java

@@ -16,7 +16,6 @@ import org.briarproject.bramble.api.db.DatabaseConfig;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.mailbox.MailboxDirectory;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.BluetoothConstants;
 import org.briarproject.bramble.api.plugin.LanTcpConstants;
 import org.briarproject.bramble.api.plugin.PluginConfig;
@@ -63,6 +62,7 @@ import org.briarproject.briar.api.android.LockManager;
 import org.briarproject.briar.api.android.NetworkUsageMetrics;
 import org.briarproject.briar.api.android.ScreenFilterMonitor;
 import org.briarproject.briar.api.test.TestAvatarCreator;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.File;
 import java.security.GeneralSecurityException;

briar-android/src/main/java/org/briarproject/briar/android/BriarService.java

@@ -50,7 +50,6 @@ import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.ALREADY_RUNNING;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.SUCCESS;
-import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
 import static org.briarproject.bramble.util.AndroidUtils.isUiThread;
 import static org.briarproject.briar.android.BriarApplication.ENTRY_ACTIVITY;
 import static org.briarproject.briar.api.android.AndroidNotificationManager.FAILURE_CHANNEL_ID;
@@ -59,6 +58,7 @@ import static org.briarproject.briar.api.android.AndroidNotificationManager.ONGO
 import static org.briarproject.briar.api.android.AndroidNotificationManager.ONGOING_NOTIFICATION_ID;
 import static org.briarproject.briar.api.android.LockManager.ACTION_LOCK;
 import static org.briarproject.briar.api.android.LockManager.EXTRA_PID;
+import static org.briarproject.nullsafety.NullSafety.requireNonNull;
 
 public class BriarService extends Service {
 

briar-android/src/main/java/org/briarproject/briar/android/LevelRaisingHandler.java

@@ -1,6 +1,6 @@
 package org.briarproject.briar.android;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.logging.Handler;
 import java.util.logging.Level;

briar-android/src/main/java/org/briarproject/briar/android/Localizer.java

@@ -5,7 +5,7 @@ import android.content.SharedPreferences;
 import android.content.res.Configuration;
 import android.content.res.Resources;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.Locale;
 

briar-android/src/main/java/org/briarproject/briar/android/NetworkUsageMetricsImpl.java

@@ -3,8 +3,8 @@ package org.briarproject.briar.android;
 import android.net.TrafficStats;
 import android.os.Process;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.api.android.NetworkUsageMetrics;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.logging.Logger;
 

briar-android/src/main/java/org/briarproject/briar/android/RecentEmojiImpl.java

@@ -9,12 +9,12 @@ import org.briarproject.bramble.api.db.DatabaseExecutor;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager.OpenDatabaseHook;
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.settings.Settings;
 import org.briarproject.bramble.api.settings.SettingsManager;
 import org.briarproject.bramble.api.system.AndroidExecutor;
 import org.briarproject.bramble.util.StringUtils;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import java.util.ArrayList;
 import java.util.Collection;

briar-android/src/main/java/org/briarproject/briar/android/ScreenFilterMonitorImpl.java

@@ -13,10 +13,10 @@ import android.content.pm.PackageManager.NameNotFoundException;
 import android.content.pm.Signature;
 
 import org.briarproject.bramble.api.lifecycle.Service;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.system.AndroidExecutor;
 import org.briarproject.bramble.util.StringUtils;
 import org.briarproject.briar.api.android.ScreenFilterMonitor;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.ByteArrayInputStream;
 import java.io.InputStream;

briar-android/src/main/java/org/briarproject/briar/android/StartupFailureActivity.java

@@ -3,13 +3,13 @@ package org.briarproject.briar.android;
 import android.content.Intent;
 import android.os.Bundle;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BaseActivity;
 import org.briarproject.briar.android.fragment.BaseFragment.BaseFragmentListener;
 import org.briarproject.briar.android.fragment.ErrorFragment;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;

briar-android/src/main/java/org/briarproject/briar/android/account/AuthorNameFragment.java

@@ -10,9 +10,9 @@ import android.widget.Button;
 import com.google.android.material.textfield.TextInputEditText;
 import com.google.android.material.textfield.TextInputLayout;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import javax.annotation.Nullable;
 

briar-android/src/main/java/org/briarproject/briar/android/account/DozeFragment.java

@@ -9,10 +9,10 @@ import android.view.ViewGroup;
 import android.widget.Button;
 import android.widget.ProgressBar;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.account.PowerView.OnCheckedChangedListener;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import androidx.annotation.Nullable;
 

briar-android/src/main/java/org/briarproject/briar/android/account/DozeView.java

@@ -4,8 +4,8 @@ package org.briarproject.briar.android.account;
 import android.content.Context;
 import android.util.AttributeSet;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import androidx.annotation.Nullable;
 import androidx.annotation.UiThread;

briar-android/src/main/java/org/briarproject/briar/android/account/HuaweiAppLaunchView.java

@@ -6,8 +6,8 @@ import android.content.Intent;
 import android.util.AttributeSet;
 import android.widget.Toast;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.logging.Logger;
 

briar-android/src/main/java/org/briarproject/briar/android/account/HuaweiProtectedAppsView.java

@@ -4,8 +4,8 @@ package org.briarproject.briar.android.account;
 import android.content.Context;
 import android.util.AttributeSet;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import javax.annotation.Nullable;
 

briar-android/src/main/java/org/briarproject/briar/android/account/LockManagerImpl.java

@@ -11,8 +11,6 @@ import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.event.EventListener;
 import org.briarproject.bramble.api.lifecycle.Service;
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.settings.Settings;
 import org.briarproject.bramble.api.settings.SettingsManager;
 import org.briarproject.bramble.api.settings.event.SettingsUpdatedEvent;
@@ -20,6 +18,8 @@ import org.briarproject.briar.R;
 import org.briarproject.briar.android.BriarService;
 import org.briarproject.briar.api.android.AndroidNotificationManager;
 import org.briarproject.briar.api.android.LockManager;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import java.util.concurrent.Executor;
 import java.util.logging.Logger;

briar-android/src/main/java/org/briarproject/briar/android/account/PowerView.java

@@ -11,8 +11,8 @@ import android.widget.ImageButton;
 import android.widget.ImageView;
 import android.widget.TextView;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import androidx.annotation.Nullable;
 import androidx.annotation.StringRes;

briar-android/src/main/java/org/briarproject/briar/android/account/SetPasswordFragment.java

@@ -12,10 +12,10 @@ import android.widget.ProgressBar;
 import com.google.android.material.textfield.TextInputEditText;
 import com.google.android.material.textfield.TextInputLayout;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.login.StrengthMeter;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import javax.annotation.Nullable;
 

briar-android/src/main/java/org/briarproject/briar/android/account/SetupActivity.java

@@ -4,12 +4,12 @@ import android.annotation.TargetApi;
 import android.content.Intent;
 import android.os.Bundle;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BaseActivity;
 import org.briarproject.briar.android.fragment.BaseFragment.BaseFragmentListener;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import javax.annotation.Nullable;
 import javax.inject.Inject;

briar-android/src/main/java/org/briarproject/briar/android/account/SetupFragment.java

@@ -10,11 +10,11 @@ import android.view.View.OnClickListener;
 import android.widget.TextView;
 import android.widget.TextView.OnEditorActionListener;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.fragment.BaseFragment;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import javax.inject.Inject;
 

briar-android/src/main/java/org/briarproject/briar/android/account/SetupViewModel.java

@@ -6,10 +6,10 @@ import org.briarproject.android.dontkillmelib.DozeHelper;
 import org.briarproject.bramble.api.account.AccountManager;
 import org.briarproject.bramble.api.crypto.PasswordStrengthEstimator;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.android.viewmodel.LiveEvent;
 import org.briarproject.briar.android.viewmodel.MutableLiveEvent;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import java.util.concurrent.Executor;
 import java.util.logging.Logger;

briar-android/src/main/java/org/briarproject/briar/android/account/UnlockActivity.java

@@ -10,12 +10,12 @@ import android.os.Bundle;
 import android.os.CancellationSignal;
 import android.widget.Toast;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BaseActivity;
 import org.briarproject.briar.api.android.LockManager;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import java.util.logging.Logger;
 

briar-android/src/main/java/org/briarproject/briar/android/account/XiaomiLockAppsView.java

@@ -4,8 +4,8 @@ import android.content.Context;
 import android.util.AttributeSet;
 import android.widget.Toast;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.logging.Logger;
 

briar-android/src/main/java/org/briarproject/briar/android/account/XiaomiRecentAppsView.java

@@ -3,8 +3,8 @@ package org.briarproject.briar.android.account;
 import android.content.Context;
 import android.util.AttributeSet;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import javax.annotation.Nullable;
 

briar-android/src/main/java/org/briarproject/briar/android/activity/BaseActivity.java

@@ -6,8 +6,6 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.view.ViewGroup.LayoutParams;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.AndroidComponent;
 import org.briarproject.briar.android.BriarApplication;
@@ -21,6 +19,8 @@ import org.briarproject.briar.android.widget.TapSafeFrameLayout;
 import org.briarproject.briar.android.widget.TapSafeFrameLayout.OnTapFilteredListener;
 import org.briarproject.briar.api.android.ScreenFilterMonitor;
 import org.briarproject.briar.api.android.ScreenFilterMonitor.AppDetails;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import java.util.ArrayList;
 import java.util.Collection;

briar-android/src/main/java/org/briarproject/briar/android/activity/BriarActivity.java

@@ -5,8 +5,6 @@ import android.transition.Transition;
 import android.view.Window;
 import android.widget.CheckBox;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.system.AndroidWakeLockManager;
 import org.briarproject.bramble.api.system.Wakeful;
 import org.briarproject.briar.R;
@@ -18,6 +16,8 @@ import org.briarproject.briar.android.controller.handler.UiResultHandler;
 import org.briarproject.briar.android.login.StartupActivity;
 import org.briarproject.briar.android.logout.ExitActivity;
 import org.briarproject.briar.api.android.LockManager;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import java.util.logging.Logger;
 

briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentCreationTask.java

@@ -5,11 +5,11 @@ import android.net.Uri;
 
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.briar.android.attachment.media.ImageCompressor;
 import org.briarproject.briar.api.attachment.AttachmentHeader;
 import org.briarproject.briar.api.messaging.MessagingManager;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.IOException;
 import java.io.InputStream;

briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentCreator.java

@@ -3,10 +3,10 @@ package org.briarproject.briar.android.attachment;
 import android.net.Uri;
 
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.briar.api.attachment.AttachmentHeader;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.Collection;
 import java.util.List;

briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentCreatorImpl.java

@@ -6,7 +6,6 @@ import android.net.Uri;
 
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.briar.R;
@@ -15,6 +14,7 @@ import org.briarproject.briar.api.attachment.Attachment;
 import org.briarproject.briar.api.attachment.AttachmentHeader;
 import org.briarproject.briar.api.attachment.FileTooBigException;
 import org.briarproject.briar.api.messaging.MessagingManager;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.IOException;
 import java.util.ArrayList;

briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentDimensions.java

@@ -2,8 +2,8 @@ package org.briarproject.briar.android.attachment;
 
 import android.content.res.Resources;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import javax.annotation.concurrent.Immutable;
 

briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentItem.java

@@ -3,10 +3,10 @@ package org.briarproject.briar.android.attachment;
 import android.os.Parcel;
 import android.os.Parcelable;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.briar.api.attachment.AttachmentHeader;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import javax.annotation.concurrent.Immutable;
 

briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentItemResult.java

@@ -2,7 +2,7 @@ package org.briarproject.briar.android.attachment;
 
 import android.net.Uri;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.Immutable;

briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentManager.java

@@ -2,8 +2,8 @@ package org.briarproject.briar.android.attachment;
 
 import android.net.Uri;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.api.attachment.AttachmentHeader;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.Collection;
 import java.util.List;

briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentResult.java

@@ -1,6 +1,6 @@
 package org.briarproject.briar.android.attachment;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.Collection;
 

briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentRetriever.java

@@ -2,12 +2,12 @@ package org.briarproject.briar.android.attachment;
 
 import org.briarproject.bramble.api.db.DatabaseExecutor;
 import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.briar.api.attachment.Attachment;
 import org.briarproject.briar.api.attachment.AttachmentHeader;
 import org.briarproject.briar.api.messaging.PrivateMessageHeader;
 import org.briarproject.briar.api.messaging.event.AttachmentReceivedEvent;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.InputStream;
 import java.util.List;

briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentRetrieverImpl.java

@@ -3,7 +3,6 @@ package org.briarproject.briar.android.attachment;
 import org.briarproject.bramble.api.db.DatabaseExecutor;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.NoSuchMessageException;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.briar.android.attachment.AttachmentItem.State;
 import org.briarproject.briar.android.attachment.media.ImageHelper;
@@ -13,6 +12,7 @@ import org.briarproject.briar.api.attachment.Attachment;
 import org.briarproject.briar.api.attachment.AttachmentHeader;
 import org.briarproject.briar.api.attachment.AttachmentReader;
 import org.briarproject.briar.api.messaging.PrivateMessageHeader;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.BufferedInputStream;
 import java.io.InputStream;

briar-android/src/main/java/org/briarproject/briar/android/attachment/media/ImageHelper.java

@@ -1,6 +1,6 @@
 package org.briarproject.briar.android.attachment.media;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.InputStream;
 

briar-android/src/main/java/org/briarproject/briar/android/attachment/media/ImageHelperImpl.java

@@ -3,7 +3,7 @@ package org.briarproject.briar.android.attachment.media;
 import android.graphics.BitmapFactory;
 import android.webkit.MimeTypeMap;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.InputStream;
 

briar-android/src/main/java/org/briarproject/briar/android/attachment/media/ImageSizeCalculator.java

@@ -1,6 +1,6 @@
 package org.briarproject.briar.android.attachment.media;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.InputStream;
 

briar-android/src/main/java/org/briarproject/briar/android/attachment/media/ImageSizeCalculatorImpl.java

@@ -2,8 +2,8 @@ package org.briarproject.briar.android.attachment.media;
 
 import com.bumptech.glide.util.MarkEnforcingInputStream;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.android.attachment.media.ImageHelper.DecodeResult;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.IOException;
 import java.io.InputStream;

briar-android/src/main/java/org/briarproject/briar/android/attachment/media/Size.java

@@ -1,6 +1,6 @@
 package org.briarproject.briar.android.attachment.media;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import javax.annotation.concurrent.Immutable;
 

briar-android/src/main/java/org/briarproject/briar/android/blog/BaseViewModel.java

@@ -11,7 +11,6 @@ import org.briarproject.bramble.api.event.EventListener;
 import org.briarproject.bramble.api.identity.IdentityManager;
 import org.briarproject.bramble.api.identity.LocalAuthor;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.bramble.api.system.AndroidExecutor;
@@ -23,6 +22,7 @@ import org.briarproject.briar.api.blog.BlogCommentHeader;
 import org.briarproject.briar.api.blog.BlogManager;
 import org.briarproject.briar.api.blog.BlogPostHeader;
 import org.briarproject.briar.util.HtmlUtils;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.ArrayList;
 import java.util.Collections;

briar-android/src/main/java/org/briarproject/briar/android/blog/BlogActivity.java

@@ -3,8 +3,6 @@ package org.briarproject.briar.android.blog;
 import android.content.Intent;
 import android.os.Bundle;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.briar.R;
@@ -13,6 +11,8 @@ import org.briarproject.briar.android.activity.BriarActivity;
 import org.briarproject.briar.android.fragment.BaseFragment;
 import org.briarproject.briar.android.fragment.BaseFragment.BaseFragmentListener;
 import org.briarproject.briar.android.sharing.BlogSharingStatusActivity;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import javax.annotation.Nullable;
 import javax.inject.Inject;

briar-android/src/main/java/org/briarproject/briar/android/blog/BlogFragment.java

@@ -10,8 +10,6 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Toast;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
@@ -22,6 +20,8 @@ import org.briarproject.briar.android.sharing.ShareBlogActivity;
 import org.briarproject.briar.android.util.BriarSnackbarBuilder;
 import org.briarproject.briar.android.view.BriarRecyclerView;
 import org.briarproject.briar.android.widget.LinkDialogFragment;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import javax.inject.Inject;
 

briar-android/src/main/java/org/briarproject/briar/android/blog/BlogPostAdapter.java

@@ -4,9 +4,9 @@ import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import androidx.recyclerview.widget.DiffUtil;
 import androidx.recyclerview.widget.ListAdapter;

briar-android/src/main/java/org/briarproject/briar/android/blog/BlogPostFragment.java

@@ -9,14 +9,14 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ProgressBar;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.fragment.BaseFragment;
 import org.briarproject.briar.android.widget.LinkDialogFragment;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import java.util.logging.Logger;
 

briar-android/src/main/java/org/briarproject/briar/android/blog/BlogPostViewHolder.java

@@ -9,12 +9,12 @@ import android.view.ViewGroup;
 import android.widget.ImageButton;
 import android.widget.TextView;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.view.AuthorView;
 import org.briarproject.briar.api.blog.BlogCommentHeader;
 import org.briarproject.briar.api.blog.BlogPostHeader;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import androidx.annotation.UiThread;
 import androidx.core.view.ViewCompat;

briar-android/src/main/java/org/briarproject/briar/android/blog/BlogViewModel.java

@@ -12,8 +12,6 @@ import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.identity.IdentityManager;
 import org.briarproject.bramble.api.identity.LocalAuthor;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.bramble.api.sync.event.GroupRemovedEvent;
 import org.briarproject.bramble.api.system.AndroidExecutor;
@@ -27,6 +25,8 @@ import org.briarproject.briar.api.blog.BlogSharingManager;
 import org.briarproject.briar.api.blog.event.BlogInvitationResponseReceivedEvent;
 import org.briarproject.briar.api.blog.event.BlogPostAddedEvent;
 import org.briarproject.briar.api.sharing.event.ContactLeftShareableEvent;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import java.util.ArrayList;
 import java.util.Collection;

briar-android/src/main/java/org/briarproject/briar/android/blog/FeedFragment.java

@@ -9,8 +9,6 @@ import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
@@ -20,6 +18,8 @@ import org.briarproject.briar.android.util.BriarSnackbarBuilder;
 import org.briarproject.briar.android.view.BriarRecyclerView;
 import org.briarproject.briar.android.widget.LinkDialogFragment;
 import org.briarproject.briar.api.blog.Blog;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import javax.inject.Inject;
 

briar-android/src/main/java/org/briarproject/briar/android/blog/FeedViewModel.java

@@ -11,7 +11,6 @@ import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.identity.Author;
 import org.briarproject.bramble.api.identity.IdentityManager;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.bramble.api.sync.event.GroupRemovedEvent;
 import org.briarproject.bramble.api.system.AndroidExecutor;
@@ -20,6 +19,7 @@ import org.briarproject.briar.api.android.AndroidNotificationManager;
 import org.briarproject.briar.api.blog.Blog;
 import org.briarproject.briar.api.blog.BlogManager;
 import org.briarproject.briar.api.blog.event.BlogPostAddedEvent;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.ArrayList;
 import java.util.Collections;

briar-android/src/main/java/org/briarproject/briar/android/blog/ReblogFragment.java

@@ -7,8 +7,6 @@ import android.view.ViewGroup;
 import android.widget.ProgressBar;
 import android.widget.ScrollView;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.briar.R;
@@ -20,6 +18,8 @@ import org.briarproject.briar.android.view.TextSendController.SendListener;
 import org.briarproject.briar.android.view.TextSendController.SendState;
 import org.briarproject.briar.android.widget.LinkDialogFragment;
 import org.briarproject.briar.api.attachment.AttachmentHeader;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import java.util.List;
 

briar-android/src/main/java/org/briarproject/briar/android/blog/RssFeedActivity.java

@@ -3,12 +3,12 @@ package org.briarproject.briar.android.blog;
 import android.os.Bundle;
 import android.widget.Toast;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BriarActivity;
 import org.briarproject.briar.android.fragment.BaseFragment.BaseFragmentListener;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import javax.inject.Inject;
 

briar-android/src/main/java/org/briarproject/briar/android/blog/RssFeedAdapter.java

@@ -7,9 +7,9 @@ import android.view.ViewGroup;
 import android.widget.ImageButton;
 import android.widget.TextView;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.api.feed.Feed;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import androidx.recyclerview.widget.DiffUtil;
 import androidx.recyclerview.widget.ListAdapter;

briar-android/src/main/java/org/briarproject/briar/android/blog/RssFeedDeleteFeedDialogFragment.java

@@ -4,11 +4,11 @@ import android.app.Dialog;
 import android.content.Context;
 import android.os.Bundle;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.BaseActivity;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import javax.inject.Inject;
 

briar-android/src/main/java/org/briarproject/briar/android/blog/RssFeedImportFailedDialogFragment.java

@@ -4,10 +4,10 @@ import android.app.Dialog;
 import android.content.Context;
 import android.os.Bundle;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.BaseActivity;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import javax.inject.Inject;
 

briar-android/src/main/java/org/briarproject/briar/android/blog/RssFeedImportFragment.java

@@ -10,11 +10,11 @@ import android.widget.Button;
 import android.widget.EditText;
 import android.widget.ProgressBar;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.fragment.BaseFragment;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import javax.annotation.Nullable;
 import javax.inject.Inject;

briar-android/src/main/java/org/briarproject/briar/android/blog/RssFeedManageFragment.java

@@ -9,13 +9,13 @@ import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.fragment.BaseFragment;
 import org.briarproject.briar.android.view.BriarRecyclerView;
 import org.briarproject.briar.api.feed.Feed;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import javax.annotation.Nullable;
 import javax.inject.Inject;
@@ -24,9 +24,9 @@ import androidx.lifecycle.ViewModelProvider;
 import androidx.recyclerview.widget.LinearLayoutManager;
 
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
-import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 import static org.briarproject.briar.android.blog.RssFeedAdapter.RssFeedListener;
+import static org.briarproject.nullsafety.NullSafety.requireNonNull;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault

briar-android/src/main/java/org/briarproject/briar/android/blog/RssFeedViewModel.java

@@ -9,7 +9,6 @@ import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.db.TransactionManager;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.bramble.api.system.AndroidExecutor;
 import org.briarproject.briar.android.viewmodel.DbViewModel;
@@ -18,6 +17,7 @@ import org.briarproject.briar.android.viewmodel.LiveResult;
 import org.briarproject.briar.android.viewmodel.MutableLiveEvent;
 import org.briarproject.briar.api.feed.Feed;
 import org.briarproject.briar.api.feed.FeedManager;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.IOException;
 import java.net.MalformedURLException;

briar-android/src/main/java/org/briarproject/briar/android/blog/WriteBlogPostActivity.java

@@ -9,8 +9,6 @@ import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.identity.IdentityManager;
 import org.briarproject.bramble.api.identity.LocalAuthor;
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
@@ -23,6 +21,8 @@ import org.briarproject.briar.api.attachment.AttachmentHeader;
 import org.briarproject.briar.api.blog.BlogManager;
 import org.briarproject.briar.api.blog.BlogPost;
 import org.briarproject.briar.api.blog.BlogPostFactory;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import java.security.GeneralSecurityException;
 import java.util.List;

briar-android/src/main/java/org/briarproject/briar/android/contact/ContactItem.java

@@ -1,8 +1,8 @@
 package org.briarproject.briar.android.contact;
 
 import org.briarproject.bramble.api.contact.Contact;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.api.identity.AuthorInfo;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import javax.annotation.concurrent.Immutable;
 

briar-android/src/main/java/org/briarproject/briar/android/contact/ContactItemViewHolder.java

@@ -5,10 +5,10 @@ import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.view.TrustIndicatorView;
 import org.briarproject.briar.api.identity.AuthorInfo;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import javax.annotation.Nullable;
 

briar-android/src/main/java/org/briarproject/briar/android/contact/ContactListAdapter.java

@@ -4,9 +4,9 @@ import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.NullSafety;
 import org.briarproject.briar.R;
+import org.briarproject.nullsafety.NotNullByDefault;
+import org.briarproject.nullsafety.NullSafety;
 
 import androidx.recyclerview.widget.DiffUtil.ItemCallback;
 import androidx.recyclerview.widget.ListAdapter;

briar-android/src/main/java/org/briarproject/briar/android/contact/ContactListFragment.java

@@ -11,8 +11,6 @@ import com.google.android.material.floatingactionbutton.FloatingActionButton;
 import com.google.android.material.snackbar.Snackbar;
 
 import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.contact.add.nearby.AddNearbyContactActivity;
@@ -22,6 +20,8 @@ import org.briarproject.briar.android.conversation.ConversationActivity;
 import org.briarproject.briar.android.fragment.BaseFragment;
 import org.briarproject.briar.android.util.BriarSnackbarBuilder;
 import org.briarproject.briar.android.view.BriarRecyclerView;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import javax.annotation.Nullable;
 import javax.inject.Inject;

briar-android/src/main/java/org/briarproject/briar/android/contact/ContactListItem.java

@@ -1,11 +1,10 @@
 package org.briarproject.briar.android.contact;
 
 import org.briarproject.bramble.api.contact.Contact;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.api.attachment.AttachmentHeader;
 import org.briarproject.briar.api.client.MessageTracker.GroupCount;
-import org.briarproject.briar.api.conversation.ConversationMessageHeader;
 import org.briarproject.briar.api.identity.AuthorInfo;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.Immutable;

briar-android/src/main/java/org/briarproject/briar/android/contact/ContactListItemViewHolder.java

@@ -3,8 +3,8 @@ package org.briarproject.briar.android.contact;
 import android.view.View;
 import android.widget.TextView;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.Locale;
 

briar-android/src/main/java/org/briarproject/briar/android/contact/ContactListViewModel.java

@@ -12,11 +12,11 @@ import org.briarproject.bramble.api.db.TransactionManager;
 import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.system.AndroidExecutor;
 import org.briarproject.briar.api.android.AndroidNotificationManager;
 import org.briarproject.briar.api.conversation.ConversationManager;
 import org.briarproject.briar.api.identity.AuthorManager;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.concurrent.Executor;
 

briar-android/src/main/java/org/briarproject/briar/android/contact/ContactsViewModel.java

@@ -17,7 +17,6 @@ import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.event.EventListener;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.event.ContactConnectedEvent;
 import org.briarproject.bramble.api.plugin.event.ContactDisconnectedEvent;
 import org.briarproject.bramble.api.system.AndroidExecutor;
@@ -26,11 +25,10 @@ import org.briarproject.briar.android.viewmodel.LiveResult;
 import org.briarproject.briar.api.avatar.event.AvatarUpdatedEvent;
 import org.briarproject.briar.api.client.MessageTracker;
 import org.briarproject.briar.api.conversation.ConversationManager;
-import org.briarproject.briar.api.conversation.ConversationMessageHeader;
-import org.briarproject.briar.api.conversation.event.ConversationMessageReceivedEvent;
 import org.briarproject.briar.api.conversation.event.ConversationMessageTrackedEvent;
 import org.briarproject.briar.api.identity.AuthorInfo;
 import org.briarproject.briar.api.identity.AuthorManager;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.ArrayList;
 import java.util.Collections;

briar-android/src/main/java/org/briarproject/briar/android/contact/add/nearby/AddNearbyContactActivity.java

@@ -6,8 +6,6 @@ import android.view.MenuItem;
 import android.widget.Toast;
 
 import org.briarproject.bramble.api.identity.Author;
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BriarActivity;
@@ -18,6 +16,8 @@ import org.briarproject.briar.android.contact.add.nearby.AddNearbyContactViewMod
 import org.briarproject.briar.android.fragment.BaseFragment;
 import org.briarproject.briar.android.fragment.BaseFragment.BaseFragmentListener;
 import org.briarproject.briar.android.util.ActivityLaunchers.RequestBluetoothDiscoverable;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import java.util.logging.Logger;
 

briar-android/src/main/java/org/briarproject/briar/android/contact/add/nearby/AddNearbyContactErrorFragment.java

@@ -8,12 +8,12 @@ import android.view.ViewGroup;
 import android.widget.Button;
 import android.widget.TextView;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.fragment.BaseFragment;
 import org.briarproject.briar.android.util.UiUtils;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import javax.inject.Inject;
 

briar-android/src/main/java/org/briarproject/briar/android/contact/add/nearby/AddNearbyContactFragment.java

@@ -10,8 +10,6 @@ import android.widget.LinearLayout.LayoutParams;
 import android.widget.TextView;
 import android.widget.Toast;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.contact.add.nearby.AddContactState.ContactExchangeStarted;
@@ -23,6 +21,8 @@ import org.briarproject.briar.android.fragment.BaseFragment;
 import org.briarproject.briar.android.qrcode.CameraException;
 import org.briarproject.briar.android.qrcode.CameraView;
 import org.briarproject.briar.android.view.QrCodeView;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import java.util.logging.Logger;
 

briar-android/src/main/java/org/briarproject/briar/android/contact/add/nearby/AddNearbyContactIntroFragment.java

@@ -6,11 +6,11 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ScrollView;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.fragment.BaseFragment;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import javax.annotation.Nullable;
 import javax.inject.Inject;

briar-android/src/main/java/org/briarproject/briar/android/contact/add/nearby/AddNearbyContactViewModel.java

@@ -34,7 +34,6 @@ import org.briarproject.bramble.api.keyagreement.event.KeyAgreementListeningEven
 import org.briarproject.bramble.api.keyagreement.event.KeyAgreementStartedEvent;
 import org.briarproject.bramble.api.keyagreement.event.KeyAgreementWaitingEvent;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.BluetoothConstants;
 import org.briarproject.bramble.api.plugin.LanTcpConstants;
 import org.briarproject.bramble.api.plugin.Plugin;
@@ -57,6 +56,7 @@ import org.briarproject.briar.android.qrcode.QrCodeDecoder;
 import org.briarproject.briar.android.qrcode.QrCodeUtils;
 import org.briarproject.briar.android.viewmodel.LiveEvent;
 import org.briarproject.briar.android.viewmodel.MutableLiveEvent;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.IOException;
 import java.nio.charset.Charset;

briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/AddContactActivity.java

@@ -5,12 +5,12 @@ import android.os.Bundle;
 import android.view.MenuItem;
 import android.widget.Toast;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BriarActivity;
 import org.briarproject.briar.android.fragment.BaseFragment.BaseFragmentListener;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import javax.annotation.Nullable;
 import javax.inject.Inject;

briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/AddContactViewModel.java

@@ -11,12 +11,12 @@ import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.NoSuchPendingContactException;
 import org.briarproject.bramble.api.db.TransactionManager;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.system.AndroidExecutor;
 import org.briarproject.briar.android.viewmodel.DbViewModel;
 import org.briarproject.briar.android.viewmodel.LiveEvent;
 import org.briarproject.briar.android.viewmodel.LiveResult;
 import org.briarproject.briar.android.viewmodel.MutableLiveEvent;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.security.GeneralSecurityException;
 import java.util.concurrent.Executor;

briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/LinkExchangeFragment.java

@@ -16,11 +16,11 @@ import android.widget.Toast;
 import com.google.android.material.textfield.TextInputEditText;
 import com.google.android.material.textfield.TextInputLayout;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.fragment.BaseFragment;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import java.util.regex.Matcher;
 

briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/NicknameFragment.java

@@ -20,11 +20,11 @@ import org.briarproject.bramble.api.contact.PendingContact;
 import org.briarproject.bramble.api.db.ContactExistsException;
 import org.briarproject.bramble.api.db.PendingContactExistsException;
 import org.briarproject.bramble.api.identity.Author;
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.fragment.BaseFragment;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import javax.annotation.Nullable;
 import javax.inject.Inject;

briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/PendingContactItem.java

@@ -2,7 +2,7 @@ package org.briarproject.briar.android.contact.add.remote;
 
 import org.briarproject.bramble.api.contact.PendingContact;
 import org.briarproject.bramble.api.contact.PendingContactState;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import javax.annotation.concurrent.Immutable;
 

briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/PendingContactListActivity.java

@@ -7,13 +7,13 @@ import android.view.MenuItem;
 import com.google.android.material.snackbar.Snackbar;
 
 import org.briarproject.bramble.api.contact.PendingContactId;
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BriarActivity;
 import org.briarproject.briar.android.util.BriarSnackbarBuilder;
 import org.briarproject.briar.android.view.BriarRecyclerView;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import java.util.Collection;
 

briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/PendingContactListAdapter.java

@@ -6,9 +6,9 @@ import android.view.View;
 import android.view.ViewGroup;
 
 import org.briarproject.bramble.api.contact.PendingContact;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.util.BriarAdapter;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 @NotNullByDefault
 class PendingContactListAdapter extends

briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/PendingContactListViewModel.java

@@ -16,11 +16,11 @@ import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.event.EventListener;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.rendezvous.RendezvousPoller;
 import org.briarproject.bramble.api.rendezvous.event.RendezvousPollEvent;
 import org.briarproject.bramble.api.system.AndroidExecutor;
 import org.briarproject.briar.android.viewmodel.DbViewModel;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.ArrayList;
 import java.util.Collection;

briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/PendingContactViewHolder.java

@@ -4,9 +4,9 @@ import android.view.View;
 import android.widget.TextView;
 
 import org.briarproject.bramble.api.contact.PendingContact;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.view.TextAvatarView;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import androidx.appcompat.widget.AppCompatImageButton;
 import androidx.core.content.ContextCompat;

briar-android/src/main/java/org/briarproject/briar/android/contact/connect/BluetoothIntroFragment.java

@@ -9,10 +9,10 @@ import android.view.ViewGroup;
 import android.widget.Button;
 import android.widget.Toast;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.util.ActivityLaunchers.RequestBluetoothDiscoverable;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import javax.inject.Inject;
 

briar-android/src/main/java/org/briarproject/briar/android/contact/connect/BluetoothProgressFragment.java

@@ -5,9 +5,9 @@ import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;

briar-android/src/main/java/org/briarproject/briar/android/contact/connect/ConnectViaBluetoothActivity.java

@@ -6,11 +6,11 @@ import android.view.MenuItem;
 import android.widget.Toast;
 
 import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BriarActivity;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import javax.inject.Inject;
 

briar-android/src/main/java/org/briarproject/briar/android/contact/connect/ConnectViaBluetoothViewModel.java

@@ -14,7 +14,6 @@ import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.event.EventListener;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.PluginManager;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
 import org.briarproject.bramble.api.plugin.event.ConnectionOpenedEvent;
@@ -27,6 +26,7 @@ import org.briarproject.briar.android.contact.connect.ConnectViaBluetoothState.S
 import org.briarproject.briar.android.viewmodel.DbViewModel;
 import org.briarproject.briar.android.viewmodel.LiveEvent;
 import org.briarproject.briar.android.viewmodel.MutableLiveEvent;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.concurrent.Executor;
 import java.util.logging.Logger;

briar-android/src/main/java/org/briarproject/briar/android/contactselection/BaseContactSelectorAdapter.java

@@ -3,10 +3,10 @@ package org.briarproject.briar.android.contactselection;
 import android.content.Context;
 
 import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.android.contact.BaseContactListAdapter;
 import org.briarproject.briar.android.contact.ContactItemViewHolder;
 import org.briarproject.briar.android.contact.OnContactClickListener;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.ArrayList;
 import java.util.Collection;

briar-android/src/main/java/org/briarproject/briar/android/contactselection/BaseContactSelectorFragment.java

@@ -8,8 +8,6 @@ import android.view.ViewGroup;
 
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.contact.ContactItemViewHolder;
@@ -17,6 +15,8 @@ import org.briarproject.briar.android.contact.OnContactClickListener;
 import org.briarproject.briar.android.controller.handler.UiResultExceptionHandler;
 import org.briarproject.briar.android.fragment.BaseFragment;
 import org.briarproject.briar.android.view.BriarRecyclerView;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import java.util.ArrayList;
 import java.util.Collection;

briar-android/src/main/java/org/briarproject/briar/android/contactselection/BaseSelectableContactHolder.java

@@ -4,10 +4,10 @@ import android.view.View;
 import android.widget.CheckBox;
 import android.widget.TextView;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.contact.ContactItemViewHolder;
 import org.briarproject.briar.android.contact.OnContactClickListener;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import javax.annotation.Nullable;
 

briar-android/src/main/java/org/briarproject/briar/android/contactselection/ContactSelectorActivity.java

@@ -3,12 +3,12 @@ package org.briarproject.briar.android.contactselection;
 import android.os.Bundle;
 
 import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.BriarActivity;
 import org.briarproject.briar.android.fragment.BaseFragment.BaseFragmentListener;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 import java.util.ArrayList;
 import java.util.Collection;

briar-android/src/main/java/org/briarproject/briar/android/contactselection/ContactSelectorAdapter.java

@@ -5,9 +5,9 @@ import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.contact.OnContactClickListener;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 @NotNullByDefault
 class ContactSelectorAdapter extends

briar-android/src/main/java/org/briarproject/briar/android/contactselection/ContactSelectorController.java

@@ -2,10 +2,10 @@ package org.briarproject.briar.android.contactselection;
 
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.briar.android.controller.DbController;
 import org.briarproject.briar.android.controller.handler.ResultExceptionHandler;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.Collection;
 

briar-android/src/main/java/org/briarproject/briar/android/contactselection/ContactSelectorControllerImpl.java

@@ -6,12 +6,12 @@ import org.briarproject.bramble.api.contact.ContactManager;
 import org.briarproject.bramble.api.db.DatabaseExecutor;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.briar.android.controller.DbControllerImpl;
 import org.briarproject.briar.android.controller.handler.ResultExceptionHandler;
 import org.briarproject.briar.api.identity.AuthorInfo;
 import org.briarproject.briar.api.identity.AuthorManager;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.ArrayList;
 import java.util.Collection;

briar-android/src/main/java/org/briarproject/briar/android/contactselection/ContactSelectorFragment.java

@@ -5,10 +5,10 @@ import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
 
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.contact.OnContactClickListener;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault

briar-android/src/main/java/org/briarproject/briar/android/contactselection/ContactSelectorListener.java

@@ -1,7 +1,7 @@
 package org.briarproject.briar.android.contactselection;
 
 import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.Collection;
 

briar-android/src/main/java/org/briarproject/briar/android/contactselection/SelectableContactHolder.java

@@ -2,8 +2,8 @@ package org.briarproject.briar.android.contactselection;
 
 import android.view.View;
 
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.android.contact.OnContactClickListener;
+import org.briarproject.nullsafety.NotNullByDefault;
 
 import javax.annotation.Nullable;