Add Settings for back animation developer option DO NOT MERGE

Bug: 228936326
Test: BackAnimationPreferenceController
Change-Id: I48516c1f68de799473eac99d35a086046d7e6de9

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);
+    }
+}

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
+    }
+}

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;
     }