1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.settings.fuelgauge.batterysaver; 18 19 import android.content.Context; 20 import android.os.PowerManager; 21 import android.support.v7.preference.Preference; 22 import android.support.v7.preference.PreferenceScreen; 23 24 import com.android.settings.core.TogglePreferenceController; 25 import com.android.settings.fuelgauge.BatterySaverReceiver; 26 import com.android.settings.widget.TwoStateButtonPreference; 27 import com.android.settingslib.core.lifecycle.LifecycleObserver; 28 import com.android.settingslib.core.lifecycle.events.OnStart; 29 import com.android.settingslib.core.lifecycle.events.OnStop; 30 import com.android.settingslib.fuelgauge.BatterySaverUtils; 31 32 /** 33 * Controller to update the battery saver button 34 */ 35 public class BatterySaverButtonPreferenceController extends 36 TogglePreferenceController implements 37 LifecycleObserver, OnStart, OnStop, BatterySaverReceiver.BatterySaverListener { 38 39 private final BatterySaverReceiver mBatterySaverReceiver; 40 private final PowerManager mPowerManager; 41 42 private TwoStateButtonPreference mPreference; 43 BatterySaverButtonPreferenceController(Context context, String key)44 public BatterySaverButtonPreferenceController(Context context, String key) { 45 super(context, key); 46 mPowerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE); 47 mBatterySaverReceiver = new BatterySaverReceiver(context); 48 mBatterySaverReceiver.setBatterySaverListener(this); 49 } 50 51 @Override getAvailabilityStatus()52 public int getAvailabilityStatus() { 53 return AVAILABLE; 54 } 55 56 @Override isSliceable()57 public boolean isSliceable() { 58 return true; 59 } 60 61 @Override onStart()62 public void onStart() { 63 mBatterySaverReceiver.setListening(true); 64 } 65 66 @Override onStop()67 public void onStop() { 68 mBatterySaverReceiver.setListening(false); 69 } 70 71 @Override displayPreference(PreferenceScreen screen)72 public void displayPreference(PreferenceScreen screen) { 73 super.displayPreference(screen); 74 mPreference = (TwoStateButtonPreference) screen.findPreference(getPreferenceKey()); 75 } 76 77 @Override isChecked()78 public boolean isChecked() { 79 return mPowerManager.isPowerSaveMode(); 80 } 81 82 @Override setChecked(boolean stateOn)83 public boolean setChecked(boolean stateOn) { 84 // This screen already shows a warning, so we don't need another warning. 85 return BatterySaverUtils.setPowerSaveMode(mContext, stateOn, 86 false /* needFirstTimeWarning */); 87 } 88 89 @Override updateState(Preference preference)90 public void updateState(Preference preference) { 91 super.updateState(preference); 92 if (mPreference != null) { 93 mPreference.setChecked(isChecked()); 94 } 95 } 96 97 @Override onPowerSaveModeChanged()98 public void onPowerSaveModeChanged() { 99 final boolean isChecked = isChecked(); 100 if (mPreference != null && mPreference.isChecked() != isChecked) { 101 mPreference.setChecked(isChecked); 102 } 103 } 104 105 @Override onBatteryChanged(boolean pluggedIn)106 public void onBatteryChanged(boolean pluggedIn) { 107 if (mPreference != null) { 108 mPreference.setButtonEnabled(!pluggedIn); 109 } 110 } 111 } 112