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 /** Controller to update the battery saver entry preference. */
39 public class BatterySaverController extends BasePreferenceController
40         implements LifecycleObserver, OnStart, OnStop, BatterySaverReceiver.BatterySaverListener {
41     private static final String KEY_BATTERY_SAVER = "battery_saver_summary";
42     private final BatterySaverReceiver mBatteryStateChangeReceiver;
43     private final PowerManager mPowerManager;
44     private Preference mBatterySaverPref;
45     private final ContentObserver mObserver =
46             new ContentObserver(new Handler(Looper.getMainLooper())) {
47                 @Override
48                 public void onChange(boolean selfChange) {
49                     updateSummary();
50                 }
51             };
52 
BatterySaverController(Context context)53     public BatterySaverController(Context context) {
54         super(context, KEY_BATTERY_SAVER);
55 
56         mPowerManager = mContext.getSystemService(PowerManager.class);
57         mBatteryStateChangeReceiver = new BatterySaverReceiver(context);
58         mBatteryStateChangeReceiver.setBatterySaverListener(this);
59         BatterySaverUtils.revertScheduleToNoneIfNeeded(context);
60     }
61 
62     @Override
getAvailabilityStatus()63     public int getAvailabilityStatus() {
64         return AVAILABLE;
65     }
66 
67     @Override
getPreferenceKey()68     public String getPreferenceKey() {
69         return KEY_BATTERY_SAVER;
70     }
71 
72     @Override
displayPreference(PreferenceScreen screen)73     public void displayPreference(PreferenceScreen screen) {
74         super.displayPreference(screen);
75         mBatterySaverPref = screen.findPreference(KEY_BATTERY_SAVER);
76     }
77 
78     @Override
onStart()79     public void onStart() {
80         mContext.getContentResolver()
81                 .registerContentObserver(
82                         Settings.Global.getUriFor(Settings.Global.LOW_POWER_MODE_TRIGGER_LEVEL),
83                         true /* notifyForDescendants */,
84                         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 =
105                 Settings.Global.getInt(
106                         resolver,
107                         Global.AUTOMATIC_POWER_SAVE_MODE,
108                         PowerManager.POWER_SAVE_MODE_TRIGGER_PERCENTAGE);
109         if (mode == PowerManager.POWER_SAVE_MODE_TRIGGER_PERCENTAGE) {
110             final int percent =
111                     Settings.Global.getInt(
112                             resolver, Settings.Global.LOW_POWER_MODE_TRIGGER_LEVEL, 0);
113             return percent != 0
114                     ? mContext.getString(
115                             R.string.battery_saver_off_scheduled_summary,
116                             Utils.formatPercentage(percent))
117                     : mContext.getString(R.string.battery_saver_off_summary);
118         } else {
119             return mContext.getString(R.string.battery_saver_pref_auto_routine_summary);
120         }
121     }
122 
updateSummary()123     private void updateSummary() {
124         if (mBatterySaverPref != null) {
125             mBatterySaverPref.setSummary(getSummary());
126         }
127     }
128 
129     @Override
onPowerSaveModeChanged()130     public void onPowerSaveModeChanged() {
131         updateSummary();
132     }
133 
134     @Override
onBatteryChanged(boolean pluggedIn)135     public void onBatteryChanged(boolean pluggedIn) {}
136 }
137