Manipulate disappearing messages settings via settings screen

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

@@ -29,6 +29,7 @@ import org.briarproject.briar.android.contact.add.remote.PendingContactListActiv
 import org.briarproject.briar.android.conversation.AliasDialogFragment;
 import org.briarproject.briar.android.conversation.ConversationActivity;
 import org.briarproject.briar.android.conversation.ConversationSettingsActivity;
+import org.briarproject.briar.android.conversation.ConversationSettingsFragment;
 import org.briarproject.briar.android.conversation.ImageActivity;
 import org.briarproject.briar.android.conversation.ImageFragment;
 import org.briarproject.briar.android.forum.CreateForumActivity;
@@ -237,4 +238,6 @@ public interface ActivityComponent {
 
 	void inject(ImageFragment imageFragment);
 
+	void inject(ConversationSettingsFragment conversationSettingsFragment);
+
 }

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationSettingsActivity.java

@@ -1,20 +1,40 @@
 package org.briarproject.briar.android.conversation;
 
+import android.content.Intent;
 import android.os.Bundle;
 import android.view.MenuItem;
 
+import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BriarActivity;
 
+import javax.inject.Inject;
+
 import androidx.appcompat.app.ActionBar;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.lifecycle.ViewModelProviders;
+
+import static org.briarproject.briar.android.conversation.ConversationActivity.CONTACT_ID;
 
 public class ConversationSettingsActivity extends BriarActivity {
 
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+
+	private ConversationViewModel viewModel;
+
+	private ContactId contactId;
+
 	@Override
 	public void onCreate(Bundle bundle) {
 		super.onCreate(bundle);
 
+		Intent i = getIntent();
+		int id = i.getIntExtra(CONTACT_ID, -1);
+		if (id == -1) throw new IllegalStateException();
+		contactId = new ContactId(id);
+
 		ActionBar actionBar = getSupportActionBar();
 		if (actionBar != null) {
 			actionBar.setHomeButtonEnabled(true);
@@ -22,6 +42,19 @@ public class ConversationSettingsActivity extends BriarActivity {
 		}
 
 		setContentView(R.layout.activity_conversation_settings);
+
+		viewModel = ViewModelProviders.of(this, viewModelFactory)
+				.get(ConversationViewModel.class);
+	}
+
+	@Override
+	public void onResume() {
+		super.onResume();
+		// Trigger loading of contact data, noop if data was loaded already.
+		//
+		// We can only start loading data *after* we are sure
+		// the user has signed in. After sign-in, onCreate() isn't run again.
+		if (signedIn()) viewModel.setContactId(contactId);
 	}
 
 	@Override

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationSettingsFragment.java

@@ -1,16 +1,120 @@
 package org.briarproject.briar.android.conversation;
 
+import android.content.Context;
 import android.os.Bundle;
 
+import org.briarproject.bramble.api.db.DatabaseExecutor;
+import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.bramble.api.db.TransactionManager;
 import org.briarproject.briar.R;
+import org.briarproject.briar.api.autodelete.AutoDeleteManager;
 
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import androidx.lifecycle.ViewModelProvider;
+import androidx.lifecycle.ViewModelProviders;
+import androidx.preference.Preference;
 import androidx.preference.PreferenceFragmentCompat;
+import androidx.preference.SwitchPreference;
 
-public class ConversationSettingsFragment extends PreferenceFragmentCompat {
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
+import static org.briarproject.briar.android.util.UiUtils.observeOnce;
+import static org.briarproject.briar.api.autodelete.AutoDeleteConstants.NO_AUTO_DELETE_TIMER;
+
+public class ConversationSettingsFragment extends PreferenceFragmentCompat
+		implements Preference.OnPreferenceChangeListener {
+
+	private static final String DM_ENABLE = "pref_key_disappearing_messages";
+
+	private static final Logger LOG =
+			Logger.getLogger(ConversationSettingsFragment.class.getName());
+
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+
+	@Inject
+	@DatabaseExecutor
+	Executor dbExecutor;
+
+	@Inject
+	TransactionManager db;
+
+	@Inject
+	AutoDeleteManager autoDeleteManager;
+
+	private ConversationSettingsActivity listener;
+
+	private SwitchPreference enableDisappearingMessages;
+
+	private volatile boolean disappearingMessages = false;
+
+	@Override
+	public void onAttach(Context context) {
+		super.onAttach(context);
+		listener = (ConversationSettingsActivity) context;
+		listener.getActivityComponent().inject(this);
+	}
 
 	@Override
 	public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
 		addPreferencesFromResource(R.xml.conversation_settings);
+
+		enableDisappearingMessages = findPreference(DM_ENABLE);
+
+		enableDisappearingMessages.setOnPreferenceChangeListener(this);
+
+		viewModel = ViewModelProviders.of(requireActivity(), viewModelFactory)
+				.get(ConversationViewModel.class);
+	}
+
+	private ConversationViewModel viewModel;
+
+	@Override
+	public void onStart() {
+		super.onStart();
+		setSettingsEnabled(false);
+		loadSettings();
+	}
+
+	private void setSettingsEnabled(boolean enabled) {
+		enableDisappearingMessages.setEnabled(enabled);
+	}
+
+	private void loadSettings() {
+		observeOnce(viewModel.getContact(), this, c -> {
+			dbExecutor.execute(() -> {
+				try {
+					db.transaction(false, txn -> {
+						long timer = autoDeleteManager
+								.getAutoDeleteTimer(txn, c.getId());
+						disappearingMessages = timer != NO_AUTO_DELETE_TIMER;
+					});
+					displaySettings();
+				} catch (DbException e) {
+					logException(LOG, WARNING, e);
+				}
+			});
+		});
+	}
+
+	private void displaySettings() {
+		listener.runOnUiThreadUnlessDestroyed(() -> {
+			enableDisappearingMessages.setChecked(disappearingMessages);
+			setSettingsEnabled(true);
+		});
+	}
+
+	@Override
+	public boolean onPreferenceChange(Preference preference, Object newValue) {
+		if (preference == enableDisappearingMessages) {
+			boolean dmSetting = (Boolean) newValue;
+			viewModel.setAutoDeleteTimerEnabled(dmSetting);
+		}
+		return true;
 	}
 
 }

briar-android/src/main/res/xml/conversation_settings.xml

@@ -5,7 +5,7 @@
 
 	<SwitchPreference
 		android:defaultValue="true"
-		android:key="pref_key_lock"
+		android:key="pref_key_disappearing_messages"
 		android:summary="@string/disappearing_messages_summary"
 		android:title="@string/disappearing_messages_title"
 		app:iconSpaceReserved="false"/>