Add button for opening Xiaomi battery settings during setup.

briar-android/src/main/AndroidManifest.xml

@@ -459,6 +459,7 @@
 		<package android:name="com.huawei.systemmanager" />
 		<package android:name="com.huawei.powergenie" />
 		<package android:name="com.evenwell.PowerMonitor" />
+		<package android:name="com.miui.powerkeeper" />
 
 		<intent>
 			<action android:name="android.intent.action.VIEW" />

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 XiaomiBatterySaverView xiaomiBatterySaverView;
 	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);
+		xiaomiBatterySaverView = v.findViewById(R.id.xiaomiBatterySaverView);
+		xiaomiBatterySaverView.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() &&
+				xiaomiBatterySaverView.isChecked());
 	}
 
 	@SuppressLint("BatteryLife")

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) ||
+				XiaomiBatterySaverView.needsToBeShown(appContext);
 	}
 }

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

@@ -0,0 +1,76 @@
+package org.briarproject.briar.android.account;
+
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.util.AttributeSet;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.briar.R;
+
+import java.util.List;
+
+import javax.annotation.Nullable;
+
+import androidx.annotation.StringRes;
+import androidx.annotation.UiThread;
+
+import static android.content.pm.PackageManager.MATCH_DEFAULT_ONLY;
+
+@UiThread
+@NotNullByDefault
+class XiaomiBatterySaverView extends PowerView {
+
+	private final static String PACKAGE_NAME = "com.miui.powerkeeper";
+	private final static String CLASS_NAME =
+			PACKAGE_NAME + ".ui.HiddenAppsConfigActivity";
+
+	public XiaomiBatterySaverView(Context context) {
+		this(context, null);
+	}
+
+	public XiaomiBatterySaverView(Context context,
+			@Nullable AttributeSet attrs) {
+		this(context, attrs, 0);
+	}
+
+	public XiaomiBatterySaverView(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 needsToBeShown(getContext());
+	}
+
+	public static boolean needsToBeShown(Context context) {
+		PackageManager pm = context.getPackageManager();
+		List<ResolveInfo> resolveInfos = pm.queryIntentActivities(getIntent(),
+				MATCH_DEFAULT_ONLY);
+		return !resolveInfos.isEmpty();
+	}
+
+	@Override
+	@StringRes
+	protected int getHelpText() {
+		return R.string.setup_xiaomi_help;
+	}
+
+	@Override
+	protected void onButtonClick() {
+		getContext().startActivity(getIntent());
+		setChecked(true);
+	}
+
+	private static Intent getIntent() {
+		Intent intent = new Intent();
+		intent.setClassName(PACKAGE_NAME, CLASS_NAME);
+		return intent;
+	}
+
+}

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.XiaomiBatterySaverView
+			android:id="@+id/xiaomiBatterySaverView"
+			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/xiaomiBatterySaverView"
 			app:layout_constraintVertical_bias="1.0"
 			tools:enabled="true" />
 

briar-android/src/main/res/values/strings.xml

@@ -30,6 +30,9 @@
 	<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">Please tap the button below and make sure Briar is set to \"No restrictions\".</string>
+	<string name="setup_xiaomi_button">Open Background Settings</string>
+	<string name="setup_xiaomi_help">Briar must be set to \"No restrictions\" in the \"Background settings\" screen so that it can run in the background.</string>
 	<string name="warning_dozed">%s was unable to run in the background</string>
 
 	<!-- Login -->