From 33bdc81b3e10d6c19e7ba3efb9869c249d019347 Mon Sep 17 00:00:00 2001
From: akwizgran <michael@briarproject.org>
Date: Wed, 5 May 2021 12:37:23 +0100
Subject: [PATCH] Show instructions for locking Briar to the Xiaomi recent apps
 list.

---
 .../bramble/util/AndroidUtils.java            | 16 ++++
 briar-android/src/main/AndroidManifest.xml    |  3 +-
 .../briar/android/account/DozeFragment.java   |  6 +-
 .../briar/android/account/DozeHelperImpl.java |  3 +-
 .../briar/android/account/SetupActivity.java  | 16 ++++
 .../briar/android/account/XiaomiView.java     | 74 +++++++++++++++++++
 .../main/res/layout/fragment_setup_doze.xml   | 11 ++-
 briar-android/src/main/res/values/strings.xml |  5 ++
 8 files changed, 129 insertions(+), 5 deletions(-)
 create mode 100644 briar-android/src/main/java/org/briarproject/briar/android/account/XiaomiView.java

diff --git a/bramble-android/src/main/java/org/briarproject/bramble/util/AndroidUtils.java b/bramble-android/src/main/java/org/briarproject/bramble/util/AndroidUtils.java
index 5fe56cd5c..bde4b9a23 100644
--- a/bramble-android/src/main/java/org/briarproject/bramble/util/AndroidUtils.java
+++ b/bramble-android/src/main/java/org/briarproject/bramble/util/AndroidUtils.java
@@ -10,17 +10,20 @@ import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
 import java.io.File;
+import java.io.IOException;
 import java.lang.reflect.Field;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
+import java.util.Scanner;
 
 import javax.annotation.Nullable;
 
 import static android.content.Context.MODE_PRIVATE;
 import static android.os.Build.VERSION.SDK_INT;
+import static java.lang.Runtime.getRuntime;
 import static java.util.Arrays.asList;
 import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
 
@@ -118,4 +121,17 @@ public class AndroidUtils {
 	public static String[] getSupportedImageContentTypes() {
 		return new String[] {"image/jpeg", "image/png", "image/gif"};
 	}
+
+	@Nullable
+	public static String getSystemProperty(String propName) {
+		try {
+			Process p = getRuntime().exec("getprop " + propName);
+			Scanner s = new Scanner(p.getInputStream());
+			String line = s.nextLine();
+			s.close();
+			return line;
+		} catch (SecurityException | IOException e) {
+			return null;
+		}
+	}
 }
diff --git a/briar-android/src/main/AndroidManifest.xml b/briar-android/src/main/AndroidManifest.xml
index feeec1655..1eac6796d 100644
--- a/briar-android/src/main/AndroidManifest.xml
+++ b/briar-android/src/main/AndroidManifest.xml
@@ -104,8 +104,7 @@
 
 		<activity
 			android:name="org.briarproject.briar.android.account.SetupActivity"
-			android:label="@string/setup_title"
-			android:windowSoftInputMode="adjustResize|stateAlwaysVisible" />
+			android:label="@string/setup_title" />
 
 		<activity
 			android:name="org.briarproject.briar.android.splash.SplashScreenActivity"
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/account/DozeFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/account/DozeFragment.java
index 343422d7b..5f5706632 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/account/DozeFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/account/DozeFragment.java
@@ -32,6 +32,7 @@ public class DozeFragment extends SetupFragment
 	private DozeView dozeView;
 	private HuaweiProtectedAppsView huaweiProtectedAppsView;
 	private HuaweiAppLaunchView huaweiAppLaunchView;
+	private XiaomiView xiaomiView;
 	private Button next;
 	private boolean secondAttempt = false;
 
@@ -53,6 +54,8 @@ public class DozeFragment extends SetupFragment
 		huaweiProtectedAppsView.setOnCheckedChangedListener(this);
 		huaweiAppLaunchView = v.findViewById(R.id.huaweiAppLaunchView);
 		huaweiAppLaunchView.setOnCheckedChangedListener(this);
+		xiaomiView = v.findViewById(R.id.xiaomiView);
+		xiaomiView.setOnCheckedChangedListener(this);
 		next = v.findViewById(R.id.next);
 		ProgressBar progressBar = v.findViewById(R.id.progress);
 
@@ -98,7 +101,8 @@ public class DozeFragment extends SetupFragment
 	public void onCheckedChanged() {
 		next.setEnabled(dozeView.isChecked() &&
 				huaweiProtectedAppsView.isChecked() &&
-				huaweiAppLaunchView.isChecked());
+				huaweiAppLaunchView.isChecked() &&
+				xiaomiView.isChecked());
 	}
 
 	@SuppressLint("BatteryLife")
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/account/DozeHelperImpl.java b/briar-android/src/main/java/org/briarproject/briar/android/account/DozeHelperImpl.java
index 0824643d9..3ae0638ed 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/account/DozeHelperImpl.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/account/DozeHelperImpl.java
@@ -10,6 +10,7 @@ class DozeHelperImpl implements DozeHelper {
 		Context appContext = context.getApplicationContext();
 		return needsDozeWhitelisting(appContext) ||
 				HuaweiProtectedAppsView.needsToBeShown(appContext) ||
-				HuaweiAppLaunchView.needsToBeShown(appContext);
+				HuaweiAppLaunchView.needsToBeShown(appContext) ||
+				XiaomiView.isXiaomiOrRedmiDevice();
 	}
 }
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/account/SetupActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/account/SetupActivity.java
index 68d90ad95..e0df4a520 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/account/SetupActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/account/SetupActivity.java
@@ -20,6 +20,9 @@ import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TASK;
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
 import static android.content.Intent.FLAG_ACTIVITY_TASK_ON_HOME;
+import static android.view.WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE;
+import static android.view.WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE;
+import static android.view.WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN;
 import static org.briarproject.briar.android.BriarApplication.ENTRY_ACTIVITY;
 import static org.briarproject.briar.android.account.SetupViewModel.State.AUTHOR_NAME;
 import static org.briarproject.briar.android.account.SetupViewModel.State.CREATED;
@@ -55,10 +58,13 @@ public class SetupActivity extends BaseActivity
 
 	private void onStateChanged(SetupViewModel.State state) {
 		if (state == AUTHOR_NAME) {
+			showKeyboard();
 			showInitialFragment(AuthorNameFragment.newInstance());
 		} else if (state == SET_PASSWORD) {
+			showKeyboard();
 			showPasswordFragment();
 		} else if (state == DOZE) {
+			hideKeyboard();
 			showDozeFragment();
 		} else if (state == CREATED || state == FAILED) {
 			// TODO: Show an error if failed
@@ -84,6 +90,16 @@ public class SetupActivity extends BaseActivity
 		overridePendingTransition(R.anim.screen_new_in, R.anim.screen_old_out);
 	}
 
+	private void showKeyboard() {
+		getWindow().setSoftInputMode(SOFT_INPUT_ADJUST_RESIZE |
+				SOFT_INPUT_STATE_ALWAYS_VISIBLE);
+	}
+
+	private void hideKeyboard() {
+		getWindow().setSoftInputMode(SOFT_INPUT_ADJUST_RESIZE |
+				SOFT_INPUT_STATE_HIDDEN);
+	}
+
 	@Override
 	@Deprecated
 	public void runOnDbThread(Runnable runnable) {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/account/XiaomiView.java b/briar-android/src/main/java/org/briarproject/briar/android/account/XiaomiView.java
new file mode 100644
index 000000000..91a7412b9
--- /dev/null
+++ b/briar-android/src/main/java/org/briarproject/briar/android/account/XiaomiView.java
@@ -0,0 +1,74 @@
+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 javax.annotation.Nullable;
+
+import androidx.annotation.StringRes;
+import androidx.annotation.UiThread;
+
+import static android.os.Build.BRAND;
+import static org.briarproject.bramble.util.AndroidUtils.getSystemProperty;
+import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
+import static org.briarproject.briar.android.util.UiUtils.showOnboardingDialog;
+
+@UiThread
+@NotNullByDefault
+class XiaomiView extends PowerView {
+
+	public XiaomiView(Context context) {
+		this(context, null);
+	}
+
+	public XiaomiView(Context context, @Nullable AttributeSet attrs) {
+		this(context, attrs, 0);
+	}
+
+	public XiaomiView(Context context, @Nullable AttributeSet attrs,
+			int defStyleAttr) {
+		super(context, attrs, defStyleAttr);
+		setText(R.string.setup_xiaomi_text);
+		setButtonText(R.string.setup_xiaomi_button);
+	}
+
+	@Override
+	public boolean needsToBeShown() {
+		return isXiaomiOrRedmiDevice();
+	}
+
+	public static boolean isXiaomiOrRedmiDevice() {
+		return "Xiaomi".equalsIgnoreCase(BRAND) ||
+				"Redmi".equalsIgnoreCase(BRAND);
+	}
+
+	@Override
+	@StringRes
+	protected int getHelpText() {
+		return R.string.setup_xiaomi_help;
+	}
+
+	@Override
+	protected void onButtonClick() {
+		int bodyRes = isMiuiTenOrLater()
+				? R.string.setup_xiaomi_dialog_body_new
+				: R.string.setup_xiaomi_dialog_body_old;
+		showOnboardingDialog(getContext(), getContext().getString(bodyRes));
+		setChecked(true);
+	}
+
+	private boolean isMiuiTenOrLater() {
+		String version = getSystemProperty("ro.miui.ui.version.name");
+		if (isNullOrEmpty(version)) return false;
+		version = version.replaceAll("[^\\d]", "");
+		try {
+			return Integer.parseInt(version) >= 10;
+		} catch (NumberFormatException e) {
+			return false;
+		}
+	}
+}
diff --git a/briar-android/src/main/res/layout/fragment_setup_doze.xml b/briar-android/src/main/res/layout/fragment_setup_doze.xml
index 8571fde69..e32cf10b0 100644
--- a/briar-android/src/main/res/layout/fragment_setup_doze.xml
+++ b/briar-android/src/main/res/layout/fragment_setup_doze.xml
@@ -38,6 +38,15 @@
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/huaweiProtectedAppsView" />
 
+		<org.briarproject.briar.android.account.XiaomiView
+			android:id="@+id/xiaomiView"
+			android:layout_width="match_parent"
+			android:layout_height="wrap_content"
+			android:paddingBottom="@dimen/margin_large"
+			app:layout_constraintEnd_toEndOf="parent"
+			app:layout_constraintStart_toStartOf="parent"
+			app:layout_constraintTop_toBottomOf="@+id/huaweiAppLaunchView" />
+
 		<Button
 			android:id="@+id/next"
 			style="@style/BriarButton"
@@ -48,7 +57,7 @@
 			app:layout_constraintBottom_toBottomOf="parent"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/huaweiAppLaunchView"
+			app:layout_constraintTop_toBottomOf="@+id/xiaomiView"
 			app:layout_constraintVertical_bias="1.0"
 			tools:enabled="true" />
 
diff --git a/briar-android/src/main/res/values/strings.xml b/briar-android/src/main/res/values/strings.xml
index 42af8d838..e2a7cff7f 100644
--- a/briar-android/src/main/res/values/strings.xml
+++ b/briar-android/src/main/res/values/strings.xml
@@ -30,6 +30,11 @@
 	<string name="setup_huawei_app_launch_text">Please tap the button below, open the \"App launch\" screen and make sure Briar is set to \"Manage manually\".</string>
 	<string name="setup_huawei_app_launch_button">Open Battery Settings</string>
 	<string name="setup_huawei_app_launch_help">If Briar is not set to \"Manage manually\" in the \"App launch\" screen, it will not be able to run in the background.</string>
+	<string name="setup_xiaomi_text">To run in the background, Briar needs to be locked to the recent apps list</string>
+	<string name="setup_xiaomi_button">Protect Briar</string>
+	<string name="setup_xiaomi_help">If Briar is not locked to the recent apps list, it will be unable to run in the background.</string>
+	<string name="setup_xiaomi_dialog_body_old">1. Open the recent apps list (also called the app switcher)\n\n2. Swipe down on the image of Briar to show the padlock icon\n\n3. If the padlock is not locked, tap to lock it</string>
+	<string name="setup_xiaomi_dialog_body_new">1. Open the recent apps list (also called the app switcher)\n\n2. Press and hold the image of Briar until the padlock button appears\n\n3. If the padlock is not locked, tap to lock it</string>
 	<string name="warning_dozed">%s was unable to run in the background</string>
 
 	<!-- Login -->