Redesign the update logic of Allow Background Usage Page.

- Use one Controller to manage preferences related to battery Optimization Mode.
- Move optimization mode & preferences status update logic from Fragment to Controller.

Bug: 373544647
Test: atest AdvancedPowerUsageDetailTest  PowerBackgroundUsageDetailTest BatteryOptimizationModePreferenceControllerTest BackgroundUsageAllowabilityPreferenceControllerTest
Flag: EXEMPT for simple fix
Change-Id: I2b1fed837fb4904e4118ab51c1d0cda36c0f6198

src/com/android/settings/fuelgauge/BatteryOptimizationModePreferenceController.java

@@ -0,0 +1,136 @@
+/*
+ * Copyright (C) 2024 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.fuelgauge;
+
+import android.content.Context;
+import android.util.Log;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.VisibleForTesting;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.core.BasePreferenceController;
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.widget.MainSwitchPreference;
+import com.android.settingslib.widget.SelectorWithWidgetPreference;
+
+/** Controller to update the app background usage mode state in Allow background usage page */
+public class BatteryOptimizationModePreferenceController extends BasePreferenceController
+        implements PreferenceControllerMixin {
+
+    @VisibleForTesting
+    static final String KEY_BACKGROUND_USAGE_ALLOWABILITY_SWITCH =
+            "background_usage_allowability_switch";
+
+    @VisibleForTesting static final String KEY_OPTIMIZED_PREF = "optimized_preference";
+    @VisibleForTesting static final String KEY_UNRESTRICTED_PREF = "unrestricted_preference";
+
+    private final BatteryOptimizeUtils mBatteryOptimizeUtils;
+    @Nullable @VisibleForTesting MainSwitchPreference mBackgroundUsageAllowabilityPreference;
+    @Nullable @VisibleForTesting SelectorWithWidgetPreference mOptimizedPreference;
+    @Nullable @VisibleForTesting SelectorWithWidgetPreference mUnrestrictedPreference;
+
+    public BatteryOptimizationModePreferenceController(
+            @NonNull Context context,
+            @NonNull String preferenceKey,
+            @NonNull BatteryOptimizeUtils batteryOptimizeUtils) {
+        super(context, preferenceKey);
+        mBatteryOptimizeUtils = batteryOptimizeUtils;
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public void updateState(@NonNull Preference preference) {
+        updatePreferences(mBatteryOptimizeUtils.getAppOptimizationMode());
+    }
+
+    @Override
+    public void displayPreference(@NonNull PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mBackgroundUsageAllowabilityPreference =
+                screen.findPreference(KEY_BACKGROUND_USAGE_ALLOWABILITY_SWITCH);
+        mOptimizedPreference = screen.findPreference(KEY_OPTIMIZED_PREF);
+        mUnrestrictedPreference = screen.findPreference(KEY_UNRESTRICTED_PREF);
+        initPreferences();
+    }
+
+    @VisibleForTesting
+    void initPreferences() {
+        if (mBackgroundUsageAllowabilityPreference == null
+                || mOptimizedPreference == null
+                || mUnrestrictedPreference == null) {
+            return;
+        }
+        final boolean isEnabled = mBatteryOptimizeUtils.isOptimizeModeMutable();
+        mBackgroundUsageAllowabilityPreference.setEnabled(isEnabled);
+        mOptimizedPreference.setEnabled(isEnabled);
+        mUnrestrictedPreference.setEnabled(isEnabled);
+        if (isEnabled) {
+            mBackgroundUsageAllowabilityPreference.setOnPreferenceChangeListener(
+                    (preference, isAllowBackground) -> {
+                        handleBatteryOptimizeModeUpdated(
+                                (boolean) isAllowBackground
+                                        ? BatteryOptimizeUtils.MODE_OPTIMIZED
+                                        : BatteryOptimizeUtils.MODE_RESTRICTED);
+                        return true;
+                    });
+            mOptimizedPreference.setOnPreferenceClickListener(
+                    preference -> {
+                        handleBatteryOptimizeModeUpdated(BatteryOptimizeUtils.MODE_OPTIMIZED);
+                        return true;
+                    });
+            mUnrestrictedPreference.setOnPreferenceClickListener(
+                    preference -> {
+                        handleBatteryOptimizeModeUpdated(BatteryOptimizeUtils.MODE_UNRESTRICTED);
+                        return true;
+                    });
+        }
+    }
+
+    @VisibleForTesting
+    void updatePreferences(int optimizationMode) {
+        if (mBackgroundUsageAllowabilityPreference == null
+                || mOptimizedPreference == null
+                || mUnrestrictedPreference == null) {
+            return;
+        }
+        final boolean isAllowBackground = optimizationMode != BatteryOptimizeUtils.MODE_RESTRICTED;
+        mBackgroundUsageAllowabilityPreference.setChecked(isAllowBackground);
+        mOptimizedPreference.setEnabled(isAllowBackground);
+        mUnrestrictedPreference.setEnabled(isAllowBackground);
+        mOptimizedPreference.setChecked(optimizationMode == BatteryOptimizeUtils.MODE_OPTIMIZED);
+        mUnrestrictedPreference.setChecked(
+                optimizationMode == BatteryOptimizeUtils.MODE_UNRESTRICTED);
+    }
+
+    @VisibleForTesting
+    void handleBatteryOptimizeModeUpdated(int newBatteryOptimizeMode) {
+        if (mBatteryOptimizeUtils.getAppOptimizationMode() == newBatteryOptimizeMode) {
+            Log.w(TAG, "ignore same mode for: " + mBatteryOptimizeUtils.getPackageName());
+            return;
+        }
+        mBatteryOptimizeUtils.setAppUsageState(
+                newBatteryOptimizeMode, BatteryOptimizeHistoricalLogEntry.Action.APPLY);
+        updatePreferences(newBatteryOptimizeMode);
+    }
+}