Merge changes Ib3d3df9f,Iae9096a1

* changes:
  Use BatterySaverReceiver in battery saver settings
  Add controller for battery saver button

src/com/android/settings/applications/LayoutPreference.java

@@ -42,6 +42,24 @@ public class LayoutPreference extends Preference {
 
     public LayoutPreference(Context context, AttributeSet attrs) {
         super(context, attrs);
+        init(context, attrs, 0 /* defStyleAttr */);
+    }
+
+    public LayoutPreference(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        init(context, attrs, defStyleAttr);
+    }
+
+    public LayoutPreference(Context context, int resource) {
+        this(context, LayoutInflater.from(context).inflate(resource, null, false));
+    }
+
+    public LayoutPreference(Context context, View view) {
+        super(context);
+        setView(view);
+    }
+
+    private void init(Context context, AttributeSet attrs, int defStyleAttr) {
         TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.Preference);
         mAllowDividerAbove = TypedArrayUtils.getBoolean(a, R.styleable.Preference_allowDividerAbove,
                 R.styleable.Preference_allowDividerAbove, false);
@@ -50,7 +68,7 @@ public class LayoutPreference extends Preference {
         a.recycle();
 
         a = context.obtainStyledAttributes(
-                attrs, com.android.internal.R.styleable.Preference, 0, 0);
+                attrs, com.android.internal.R.styleable.Preference, defStyleAttr, 0);
         int layoutResource = a.getResourceId(com.android.internal.R.styleable.Preference_layout,
                 0);
         if (layoutResource == 0) {
@@ -64,15 +82,6 @@ public class LayoutPreference extends Preference {
         setView(view);
     }
 
-    public LayoutPreference(Context context, int resource) {
-        this(context, LayoutInflater.from(context).inflate(resource, null, false));
-    }
-
-    public LayoutPreference(Context context, View view) {
-        super(context);
-        setView(view);
-    }
-
     private void setView(View view) {
         setLayoutResource(R.layout.layout_preference_frame);
         final ViewGroup allDetails = view.findViewById(R.id.all_details);
@@ -106,4 +115,4 @@ public class LayoutPreference extends Preference {
         return mRootView.findViewById(id);
     }
 
-}
+}

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

@@ -27,7 +27,7 @@ import com.android.settings.Utils;
 
 /**
  * Use this broadcastReceiver to listen to the battery change, and it will invoke
- * {@link OnBatteryChangedListener} if any of the followings has been changed:
+ * {@link OnBatteryChangedListener} if any of the following has been changed:
  *
  * 1. Battery level(e.g. 100%->99%)
  * 2. Battery status(e.g. plugged->unplugged)
@@ -35,7 +35,14 @@ import com.android.settings.Utils;
  */
 public class BatteryBroadcastReceiver extends BroadcastReceiver {
 
-    interface OnBatteryChangedListener {
+    /**
+     * Callback when the following has been changed:
+     *
+     * Battery level(e.g. 100%->99%)
+     * Battery status(e.g. plugged->unplugged)
+     * Battery saver(e.g. off->on)
+     */
+    public interface OnBatteryChangedListener {
         void onBatteryChanged();
     }
 

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

@@ -69,7 +69,7 @@ public class BatterySaverReceiver extends BroadcastReceiver {
         mBatterySaverListener = lsn;
     }
 
-    interface BatterySaverListener {
+    public interface BatterySaverListener {
         void onPowerSaveModeChanged();
         void onBatteryChanged(boolean pluggedIn);
     }

src/com/android/settings/fuelgauge/batterysaver/BatterySaverButtonPreferenceController.java

@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2018 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.batterysaver;
+
+import android.content.Context;
+import android.os.PowerManager;
+import android.support.annotation.VisibleForTesting;
+import android.support.v7.preference.Preference;
+
+import com.android.settings.fuelgauge.BatteryBroadcastReceiver;
+import com.android.settings.fuelgauge.BatterySaverReceiver;
+import com.android.settings.widget.TwoStateButtonPreferenceController;
+import com.android.settingslib.core.lifecycle.Lifecycle;
+import com.android.settingslib.core.lifecycle.LifecycleObserver;
+import com.android.settingslib.core.lifecycle.events.OnStart;
+import com.android.settingslib.core.lifecycle.events.OnStop;
+
+/**
+ * Controller to update the battery saver button
+ */
+public class BatterySaverButtonPreferenceController extends
+        TwoStateButtonPreferenceController implements
+        LifecycleObserver, OnStart, OnStop, BatterySaverReceiver.BatterySaverListener {
+    private static final String KEY = "battery_saver_button_container";
+    private BatterySaverReceiver mBatterySaverReceiver;
+    @VisibleForTesting
+    PowerManager mPowerManager;
+
+    public BatterySaverButtonPreferenceController(Context context, Lifecycle lifecycle) {
+        super(context, KEY);
+        mPowerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
+        mBatterySaverReceiver = new BatterySaverReceiver(context);
+        mBatterySaverReceiver.setBatterySaverListener(this);
+        if (lifecycle != null) {
+            lifecycle.addObserver(this);
+        }
+    }
+
+    @Override
+    public void onStart() {
+        mBatterySaverReceiver.setListening(true);
+    }
+
+    @Override
+    public void onStop() {
+        mBatterySaverReceiver.setListening(false);
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        super.updateState(preference);
+        setButtonVisibility(!mPowerManager.isPowerSaveMode());
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public void onButtonClicked(boolean stateOn) {
+        mPowerManager.setPowerSaveMode(stateOn);
+    }
+
+    @Override
+    public void onPowerSaveModeChanged() {
+        setButtonVisibility(!mPowerManager.isPowerSaveMode());
+    }
+
+    @Override
+    public void onBatteryChanged(boolean pluggedIn) {
+        setButtonEnabled(!pluggedIn);
+    }
+}

src/com/android/settings/fuelgauge/batterysaver/BatterySaverSettings.java

@@ -78,6 +78,7 @@ public class BatterySaverSettings extends DashboardFragment {
         final List<AbstractPreferenceController> controllers = new ArrayList<>();
         controllers.add(new AutoBatterySaverPreferenceController(context));
         controllers.add(new AutoBatterySeekBarPreferenceController(context, lifecycle));
+        controllers.add(new BatterySaverButtonPreferenceController(context, lifecycle));
         return controllers;
     }
 

src/com/android/settings/widget/TwoStateButtonPreference.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2018 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.widget;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.support.v4.content.res.TypedArrayUtils;
+import android.util.AttributeSet;
+import android.widget.Button;
+
+import com.android.settings.R;
+import com.android.settings.applications.LayoutPreference;
+
+/**
+ * Preference that presents a button with two states(On vs Off)
+ */
+public class TwoStateButtonPreference extends LayoutPreference {
+    public TwoStateButtonPreference(Context context, AttributeSet attrs) {
+        super(context, attrs, TypedArrayUtils.getAttr(
+                context, R.attr.twoStateButtonPreferenceStyle, android.R.attr.preferenceStyle));
+
+        if (attrs != null) {
+            final TypedArray styledAttrs = context.obtainStyledAttributes(attrs,
+                    R.styleable.TwoStateButtonPreference);
+            final int textOnId = styledAttrs.getResourceId(
+                    R.styleable.TwoStateButtonPreference_textOn,
+                    R.string.summary_placeholder);
+            final int textOffId = styledAttrs.getResourceId(
+                    R.styleable.TwoStateButtonPreference_textOff,
+                    R.string.summary_placeholder);
+            styledAttrs.recycle();
+
+            final Button buttonOn = getStateOnButton();
+            buttonOn.setText(textOnId);
+            final Button buttonOff = getStateOffButton();
+            buttonOff.setText(textOffId);
+        }
+    }
+
+    public Button getStateOnButton() {
+        return findViewById(R.id.state_on_button);
+    }
+
+
+    public Button getStateOffButton() {
+        return findViewById(R.id.state_off_button);
+    }
+}

src/com/android/settings/widget/TwoStateButtonPreferenceController.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2018 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.widget;
+
+import android.content.Context;
+import android.support.v7.preference.PreferenceScreen;
+import android.view.View;
+import android.widget.Button;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+
+/**
+ * Controller to update the button with two states(On vs Off).
+ */
+public abstract class TwoStateButtonPreferenceController extends BasePreferenceController
+        implements View.OnClickListener {
+    private Button mButtonOn;
+    private Button mButtonOff;
+
+    public TwoStateButtonPreferenceController(Context context, String key) {
+        super(context, key);
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        final TwoStateButtonPreference preference =
+                (TwoStateButtonPreference) screen.findPreference(getPreferenceKey());
+        mButtonOn = preference.getStateOnButton();
+        mButtonOn.setOnClickListener(this);
+        mButtonOff = preference.getStateOffButton();
+        mButtonOff.setOnClickListener(this);
+    }
+
+    protected void setButtonVisibility(boolean stateOn) {
+        if (stateOn) {
+            mButtonOff.setVisibility(View.GONE);
+            mButtonOn.setVisibility(View.VISIBLE);
+        } else {
+            mButtonOff.setVisibility(View.VISIBLE);
+            mButtonOn.setVisibility(View.GONE);
+        }
+    }
+
+    protected void setButtonEnabled(boolean enabled) {
+        mButtonOn.setEnabled(enabled);
+        mButtonOff.setEnabled(enabled);
+    }
+
+    @Override
+    public void onClick(View v) {
+        final boolean stateOn = v.getId() == R.id.state_on_button;
+        onButtonClicked(stateOn);
+    }
+
+    /**
+     * Callback when button is clicked
+     *
+     * @param stateOn {@code true} if stateOn button is clicked, otherwise it means stateOff
+     *                button is clicked
+     */
+    public abstract void onButtonClicked(boolean stateOn);
+}