1 /*
2  * Copyright (C) 2017 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 package com.android.settings.fuelgauge;
17 
18 import android.content.ContentResolver;
19 import android.content.Context;
20 import android.database.ContentObserver;
21 import android.os.Handler;
22 import android.os.Looper;
23 import android.os.PowerManager;
24 import android.provider.Settings;
25 import android.provider.Settings.Global;
26 
27 import androidx.preference.Preference;
28 import androidx.preference.PreferenceScreen;
29 
30 import com.android.settings.R;
31 import com.android.settings.Utils;
32 import com.android.settings.core.BasePreferenceController;
33 import com.android.settingslib.core.lifecycle.LifecycleObserver;
34 import com.android.settingslib.core.lifecycle.events.OnStart;
35 import com.android.settingslib.core.lifecycle.events.OnStop;
36 import com.android.settingslib.fuelgauge.BatterySaverUtils;
37 
38 /**
39  * Controller to update the battery saver entry preference.
40  */
41 public class BatterySaverController extends BasePreferenceController
42         implements LifecycleObserver, OnStart, OnStop, BatterySaverReceiver.BatterySaverListener {
43     private static final String KEY_BATTERY_SAVER = "battery_saver_summary";
44     private final BatterySaverReceiver mBatteryStateChangeReceiver;
45     private final PowerManager mPowerManager;
46     private Preference mBatterySaverPref;
47     private final ContentObserver mObserver = new ContentObserver(
48             new Handler(Looper.getMainLooper())) {
49         @Override
50         public void onChange(boolean selfChange) {
51             updateSummary();
52         }
53     };
54 
BatterySaverController(Context context)55     public BatterySaverController(Context context) {
56         super(context, KEY_BATTERY_SAVER);
57 
58         mPowerManager = mContext.getSystemService(PowerManager.class);
59         mBatteryStateChangeReceiver = new BatterySaverReceiver(context);
60         mBatteryStateChangeReceiver.setBatterySaverListener(this);
61         BatterySaverUtils.revertScheduleToNoneIfNeeded(context);
62     }
63 
64     @Override
getAvailabilityStatus()65     public int getAvailabilityStatus() {
66         return AVAILABLE;
67     }
68 
69     @Override
getPreferenceKey()70     public String getPreferenceKey() {
71         return KEY_BATTERY_SAVER;
72     }
73 
74     @Override
displayPreference(PreferenceScreen screen)75     public void displayPreference(PreferenceScreen screen) {
76         super.displayPreference(screen);
77         mBatterySaverPref = screen.findPreference(KEY_BATTERY_SAVER);
78     }
79 
80     @Override
onStart()81     public void onStart() {
82         mContext.getContentResolver().registerContentObserver(
83                 Settings.Global.getUriFor(Settings.Global.LOW_POWER_MODE_TRIGGER_LEVEL),
84                 true /* notifyForDescendants */, mObserver);
85 
86         mBatteryStateChangeReceiver.setListening(true);
87         updateSummary();
88     }
89 
90     @Override
onStop()91     public void onStop() {
92         mContext.getContentResolver().unregisterContentObserver(mObserver);
93         mBatteryStateChangeReceiver.setListening(false);
94     }
95 
96     @Override
getSummary()97     public CharSequence getSummary() {
98         final boolean isPowerSaveOn = mPowerManager.isPowerSaveMode();
99         if (isPowerSaveOn) {
100             return mContext.getString(R.string.battery_saver_on_summary);
101         }
102 
103         final ContentResolver resolver = mContext.getContentResolver();
104         final int mode = Settings.Global.getInt(resolver,
105                 Global.AUTOMATIC_POWER_SAVE_MODE, PowerManager.POWER_SAVE_MODE_TRIGGER_PERCENTAGE);
106         if (mode == PowerManager.POWER_SAVE_MODE_TRIGGER_PERCENTAGE) {
107             final int percent = Settings.Global.getInt(resolver,
108                     Settings.Global.LOW_POWER_MODE_TRIGGER_LEVEL, 0);
109             return percent != 0 ?
110                     mContext.getString(R.string.battery_saver_off_scheduled_summary,
111                             Utils.formatPercentage(percent)) :
112                     mContext.getString(R.string.battery_saver_off_summary);
113         } else {
114             return mContext.getString(R.string.battery_saver_pref_auto_routine_summary);
115         }
116     }
117 
updateSummary()118     private void updateSummary() {
119         if (mBatterySaverPref != null) {
120             mBatterySaverPref.setSummary(getSummary());
121         }
122     }
123 
124     @Override
onPowerSaveModeChanged()125     public void onPowerSaveModeChanged() {
126         updateSummary();
127     }
128 
129     @Override
onBatteryChanged(boolean pluggedIn)130     public void onBatteryChanged(boolean pluggedIn) {
131     }
132 }
133