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 
22 import androidx.preference.Preference;
23 import androidx.preference.PreferenceScreen;
24 
25 import com.android.settings.core.TogglePreferenceController;
26 import com.android.settings.fuelgauge.BatterySaverReceiver;
27 import com.android.settings.widget.TwoStateButtonPreference;
28 import com.android.settingslib.core.lifecycle.LifecycleObserver;
29 import com.android.settingslib.core.lifecycle.events.OnStart;
30 import com.android.settingslib.core.lifecycle.events.OnStop;
31 import com.android.settingslib.fuelgauge.BatterySaverUtils;
32 
33 /**
34  * Controller to update the battery saver button
35  */
36 public class BatterySaverButtonPreferenceController extends
37         TogglePreferenceController implements
38         LifecycleObserver, OnStart, OnStop, BatterySaverReceiver.BatterySaverListener {
39 
40     private final BatterySaverReceiver mBatterySaverReceiver;
41     private final PowerManager mPowerManager;
42 
43     private TwoStateButtonPreference mPreference;
44 
BatterySaverButtonPreferenceController(Context context, String key)45     public BatterySaverButtonPreferenceController(Context context, String key) {
46         super(context, key);
47         mPowerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
48         mBatterySaverReceiver = new BatterySaverReceiver(context);
49         mBatterySaverReceiver.setBatterySaverListener(this);
50     }
51 
52     @Override
getAvailabilityStatus()53     public int getAvailabilityStatus() {
54         return AVAILABLE;
55     }
56 
57     @Override
isSliceable()58     public boolean isSliceable() {
59         return true;
60     }
61 
62     @Override
onStart()63     public void onStart() {
64         mBatterySaverReceiver.setListening(true);
65     }
66 
67     @Override
onStop()68     public void onStop() {
69         mBatterySaverReceiver.setListening(false);
70     }
71 
72     @Override
displayPreference(PreferenceScreen screen)73     public void displayPreference(PreferenceScreen screen) {
74         super.displayPreference(screen);
75         mPreference = screen.findPreference(getPreferenceKey());
76     }
77 
78     @Override
isChecked()79     public boolean isChecked() {
80         return mPowerManager.isPowerSaveMode();
81     }
82 
83     @Override
setChecked(boolean stateOn)84     public boolean setChecked(boolean stateOn) {
85         // This screen already shows a warning, so we don't need another warning.
86         return BatterySaverUtils.setPowerSaveMode(mContext, stateOn,
87                 false /* needFirstTimeWarning */);
88     }
89 
90     @Override
updateState(Preference preference)91     public void updateState(Preference preference) {
92         super.updateState(preference);
93         if (mPreference != null) {
94             mPreference.setChecked(isChecked());
95         }
96     }
97 
98     @Override
onPowerSaveModeChanged()99     public void onPowerSaveModeChanged() {
100         final boolean isChecked = isChecked();
101         if (mPreference != null && mPreference.isChecked() != isChecked) {
102             mPreference.setChecked(isChecked);
103         }
104     }
105 
106     @Override
onBatteryChanged(boolean pluggedIn)107     public void onBatteryChanged(boolean pluggedIn) {
108         if (mPreference != null) {
109             mPreference.setButtonEnabled(!pluggedIn);
110         }
111     }
112 }
113