diff --git a/res/xml/development_settings.xml b/res/xml/development_settings.xml
index 89e5167a11b..6319763f579 100644
--- a/res/xml/development_settings.xml
+++ b/res/xml/development_settings.xml
@@ -649,6 +649,11 @@
android:title="@string/enable_non_resizable_multi_window"
android:summary="@string/enable_non_resizable_multi_window_summary" />
+
+
diff --git a/src/com/android/settings/development/BackAnimationPreferenceController.java b/src/com/android/settings/development/BackAnimationPreferenceController.java
new file mode 100644
index 00000000000..003b1f92850
--- /dev/null
+++ b/src/com/android/settings/development/BackAnimationPreferenceController.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.development;
+
+import android.content.Context;
+import android.provider.Settings;
+
+import androidx.preference.Preference;
+import androidx.preference.SwitchPreference;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.development.DeveloperOptionsPreferenceController;
+
+import java.util.Objects;
+
+/**
+ * PreferenceController for enabling/disabling animation related to back button and back gestures.
+ */
+public class BackAnimationPreferenceController extends DeveloperOptionsPreferenceController
+ implements Preference.OnPreferenceChangeListener, PreferenceControllerMixin {
+
+ private static final String BACK_NAVIGATION_ANIMATION_KEY =
+ "back_navigation_animation";
+
+ private static final int SETTING_VALUE_OFF = 0;
+ private static final int SETTING_VALUE_ON = 1;
+ private final DevelopmentSettingsDashboardFragment mFragment;
+
+ @VisibleForTesting
+ BackAnimationPreferenceController(Context context) {
+ super(context);
+ mFragment = null;
+ }
+
+
+ public BackAnimationPreferenceController(Context context,
+ DevelopmentSettingsDashboardFragment fragment) {
+ super(context);
+ Objects.requireNonNull(fragment);
+ mFragment = fragment;
+ }
+
+ @Override
+ public String getPreferenceKey() {
+ return BACK_NAVIGATION_ANIMATION_KEY;
+ }
+
+ @Override
+ public boolean onPreferenceChange(Preference preference, Object newValue) {
+ final boolean isEnabled = (Boolean) newValue;
+ Settings.Global.putInt(mContext.getContentResolver(),
+ Settings.Global.ENABLE_BACK_ANIMATION,
+ isEnabled ? SETTING_VALUE_ON : SETTING_VALUE_OFF);
+ if (mFragment != null && isEnabled) {
+ BackAnimationPreferenceDialog.show(mFragment);
+ }
+ return true;
+ }
+
+ @Override
+ public void updateState(Preference preference) {
+ final int mode = Settings.Global.getInt(mContext.getContentResolver(),
+ Settings.Global.ENABLE_BACK_ANIMATION, SETTING_VALUE_OFF);
+ ((SwitchPreference) mPreference).setChecked(mode != SETTING_VALUE_OFF);
+ }
+
+ @Override
+ protected void onDeveloperOptionsSwitchDisabled() {
+ super.onDeveloperOptionsSwitchDisabled();
+ Settings.Global.putInt(mContext.getContentResolver(),
+ Settings.Global.ENABLE_BACK_ANIMATION, SETTING_VALUE_OFF);
+ ((SwitchPreference) mPreference).setChecked(false);
+ }
+}
diff --git a/src/com/android/settings/development/BackAnimationPreferenceDialog.java b/src/com/android/settings/development/BackAnimationPreferenceDialog.java
new file mode 100644
index 00000000000..8347e8dea95
--- /dev/null
+++ b/src/com/android/settings/development/BackAnimationPreferenceDialog.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.development;
+
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.app.settings.SettingsEnums;
+import android.content.DialogInterface;
+import android.os.Bundle;
+
+import androidx.annotation.NonNull;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentActivity;
+import androidx.fragment.app.FragmentManager;
+
+import com.android.settings.R;
+import com.android.settings.core.instrumentation.InstrumentedDialogFragment;
+
+/**
+ * Information dialog shown when enabling back animations
+ */
+public class BackAnimationPreferenceDialog extends InstrumentedDialogFragment
+ implements DialogInterface.OnClickListener {
+
+ public static final String TAG = "BackAnimationDlg";
+
+ private BackAnimationPreferenceDialog() {
+ }
+
+ /**
+ * Show this dialog.
+ */
+ public static void show(@NonNull Fragment host) {
+ FragmentActivity activity = host.getActivity();
+ if (activity == null) {
+ return;
+ }
+ FragmentManager manager = activity.getSupportFragmentManager();
+ if (manager.findFragmentByTag(TAG) == null) {
+ BackAnimationPreferenceDialog dialog = new BackAnimationPreferenceDialog();
+ dialog.setTargetFragment(host, 0 /* requestCode */);
+ dialog.show(manager, TAG);
+ }
+ }
+
+ @Override
+ public int getMetricsCategory() {
+ return SettingsEnums.DIALOG_BACK_ANIMATIONS;
+ }
+
+ @Override
+ @NonNull
+ public Dialog onCreateDialog(Bundle savedInstanceState) {
+ return new AlertDialog.Builder(getActivity())
+ .setTitle(R.string.back_navigation_animation)
+ .setMessage(R.string.back_navigation_animation_dialog)
+ .setPositiveButton(android.R.string.ok, this /* onClickListener */)
+ .create();
+ }
+
+ @Override
+ public void onClick(DialogInterface dialog, int which) {
+ // Do nothing
+ }
+}
diff --git a/src/com/android/settings/development/DevelopmentSettingsDashboardFragment.java b/src/com/android/settings/development/DevelopmentSettingsDashboardFragment.java
index 722e94e409b..3fbea5249a0 100644
--- a/src/com/android/settings/development/DevelopmentSettingsDashboardFragment.java
+++ b/src/com/android/settings/development/DevelopmentSettingsDashboardFragment.java
@@ -607,6 +607,7 @@ public class DevelopmentSettingsDashboardFragment extends RestrictedDashboardFra
controllers.add(new OverlaySettingsPreferenceController(context));
controllers.add(new StylusHandwritingPreferenceController(context));
controllers.add(new IngressRateLimitPreferenceController((context)));
+ controllers.add(new BackAnimationPreferenceController(context, fragment));
return controllers;
}
diff --git a/tests/unit/src/com/android/settings/development/BackAnimationPreferenceControllerTest.java b/tests/unit/src/com/android/settings/development/BackAnimationPreferenceControllerTest.java
new file mode 100644
index 00000000000..36693583fe9
--- /dev/null
+++ b/tests/unit/src/com/android/settings/development/BackAnimationPreferenceControllerTest.java
@@ -0,0 +1,151 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.development;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import android.app.Instrumentation;
+import android.content.ContentResolver;
+import android.content.Context;
+import android.database.ContentObserver;
+import android.net.Uri;
+import android.os.Handler;
+import android.os.Looper;
+import android.os.UserHandle;
+import android.provider.Settings;
+
+import androidx.preference.PreferenceManager;
+import androidx.preference.PreferenceScreen;
+import androidx.preference.SwitchPreference;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
+
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.MockitoAnnotations;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+@RunWith(AndroidJUnit4.class)
+public class BackAnimationPreferenceControllerTest {
+
+ private static final int SETTING_VALUE_OFF = 0;
+ private static final int SETTING_VALUE_ON = 1;
+
+ private SwitchPreference mPreference;
+
+ private Context mContext;
+ private BackAnimationPreferenceController mController;
+ private Looper mLooper;
+
+ @Before
+ public void setUp() {
+ MockitoAnnotations.initMocks(this);
+ Instrumentation instrumentation = InstrumentationRegistry.getInstrumentation();
+ mContext = instrumentation.getTargetContext();
+ mController = new BackAnimationPreferenceController(mContext);
+ mPreference = new SwitchPreference(mContext);
+ if (Looper.myLooper() == null) {
+ Looper.prepare();
+ }
+ mLooper = Looper.myLooper();
+
+ Settings.Global.putInt(mContext.getContentResolver(),
+ Settings.Global.ENABLE_BACK_ANIMATION, -1);
+
+ final PreferenceManager preferenceManager = new PreferenceManager(mContext);
+ final PreferenceScreen screen = preferenceManager.createPreferenceScreen(mContext);
+ mPreference.setKey(mController.getPreferenceKey());
+ screen.addPreference(mPreference);
+ mController.displayPreference(screen);
+ }
+
+ @Test
+ public void onPreferenceChange_switchEnabled_shouldEnableBackAnimations() {
+ mController.onPreferenceChange(mPreference, true /* new value */);
+
+ final int mode = Settings.Global.getInt(mContext.getContentResolver(),
+ Settings.Global.ENABLE_BACK_ANIMATION, -1 /* default */);
+ assertThat(mode).isEqualTo(SETTING_VALUE_ON);
+ }
+
+ @Test
+ public void onPreferenceChange_switchDisabled_shouldDisableBackAnimations() {
+ mController.onPreferenceChange(mPreference, false /* new value */);
+
+ final int mode = Settings.Global.getInt(mContext.getContentResolver(),
+ Settings.Global.ENABLE_BACK_ANIMATION, -1 /* default */);
+ assertThat(mode).isEqualTo(SETTING_VALUE_OFF);
+ }
+
+ @Test
+ public void updateState_settingEnabled_preferenceShouldBeChecked() {
+ Settings.Global.putInt(mContext.getContentResolver(),
+ Settings.Global.ENABLE_BACK_ANIMATION, SETTING_VALUE_ON);
+ mController.updateState(mPreference);
+ assertTrue(mPreference.isChecked());
+ }
+
+ @Test
+ public void updateState_settingDisabled_preferenceShouldNotBeChecked() {
+ Settings.Global.putInt(mContext.getContentResolver(),
+ Settings.Global.ENABLE_BACK_ANIMATION, SETTING_VALUE_OFF);
+
+ mController.updateState(mPreference);
+ assertFalse(mPreference.isChecked());
+ }
+
+ @Test
+ public void onDeveloperOptionsSwitchDisabled_shouldDisablePreference()
+ throws InterruptedException {
+ ContentResolver contentResolver = mContext.getContentResolver();
+ int mode = doAndWaitForSettingChange(() -> mController.onDeveloperOptionsSwitchDisabled(),
+ contentResolver);
+ assertThat(mode).isEqualTo(SETTING_VALUE_OFF);
+ assertFalse(mPreference.isEnabled());
+ assertFalse(mPreference.isChecked());
+ }
+
+ private int doAndWaitForSettingChange(Runnable runnable, ContentResolver contentResolver) {
+ CountDownLatch countDownLatch = new CountDownLatch(1);
+ ContentObserver settingsObserver =
+ new ContentObserver(new Handler(mLooper)) {
+ @Override
+ public void onChange(boolean selfChange, Uri uri) {
+ countDownLatch.countDown();
+ }
+ };
+ contentResolver.registerContentObserver(
+ Settings.Global.getUriFor(Settings.Global.ENABLE_BACK_ANIMATION),
+ false, settingsObserver, UserHandle.USER_SYSTEM
+ );
+ runnable.run();
+ try {
+ countDownLatch.await(500, TimeUnit.MILLISECONDS);
+ } catch (InterruptedException e) {
+ Assert.fail(e.getMessage());
+ }
+ return Settings.Global.getInt(contentResolver,
+ Settings.Global.ENABLE_BACK_ANIMATION, -1 /* default */);
+ }
+}