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      1 /*
      2  * Copyright (C) 2018 The Android Open Source Project
      3  * Licensed under the Apache License, Version 2.0 (the "License");
      4  * you may not use this file except in compliance with the License.
      5  * You may obtain a copy of the License at
      6  *
      7  *      http://www.apache.org/licenses/LICENSE-2.0
      8  *
      9  * Unless required by applicable law or agreed to in writing, software
     10  * distributed under the License is distributed on an "AS IS" BASIS,
     11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     12  * See the License for the specific language governing permissions and
     13  * limitations under the License.
     14  */
     15 
     16 package com.android.settings.fuelgauge.batterysaver;
     17 
     18 import android.content.ContentResolver;
     19 import android.content.Context;
     20 import android.database.ContentObserver;
     21 import android.net.Uri;
     22 import android.os.Handler;
     23 import android.os.Looper;
     24 import android.provider.Settings;
     25 import android.support.annotation.VisibleForTesting;
     26 import android.support.v7.preference.Preference;
     27 import android.support.v7.preference.PreferenceScreen;
     28 import android.util.Log;
     29 import android.view.accessibility.AccessibilityNodeInfo;
     30 
     31 import com.android.settings.R;
     32 import com.android.settings.Utils;
     33 import com.android.settings.core.BasePreferenceController;
     34 import com.android.settings.widget.SeekBarPreference;
     35 import com.android.settingslib.core.lifecycle.Lifecycle;
     36 import com.android.settingslib.core.lifecycle.LifecycleObserver;
     37 import com.android.settingslib.core.lifecycle.events.OnStart;
     38 import com.android.settingslib.core.lifecycle.events.OnStop;
     39 
     40 /**
     41  * Controller that update the battery saver seekbar
     42  */
     43 public class AutoBatterySeekBarPreferenceController extends BasePreferenceController implements
     44         LifecycleObserver, OnStart, OnStop, SeekBarPreference.OnPreferenceChangeListener {
     45     private static final String TAG = "AutoBatterySeekBarPreferenceController";
     46     @VisibleForTesting
     47     static final String KEY_AUTO_BATTERY_SEEK_BAR = "battery_saver_seek_bar";
     48     private SeekBarPreference mPreference;
     49     private AutoBatterySaverSettingObserver mContentObserver;
     50 
     51     public AutoBatterySeekBarPreferenceController(Context context, Lifecycle lifecycle) {
     52         super(context, KEY_AUTO_BATTERY_SEEK_BAR);
     53         mContentObserver = new AutoBatterySaverSettingObserver(new Handler(Looper.getMainLooper()));
     54         if (lifecycle != null) {
     55             lifecycle.addObserver(this);
     56         }
     57     }
     58 
     59     @Override
     60     public void displayPreference(PreferenceScreen screen) {
     61         super.displayPreference(screen);
     62         mPreference = (SeekBarPreference) screen.findPreference(
     63                 KEY_AUTO_BATTERY_SEEK_BAR);
     64         mPreference.setContinuousUpdates(true);
     65         mPreference.setAccessibilityRangeInfoType(
     66                 AccessibilityNodeInfo.RangeInfo.RANGE_TYPE_PERCENT);
     67         updatePreference(mPreference);
     68     }
     69 
     70     @Override
     71     public int getAvailabilityStatus() {
     72         return AVAILABLE;
     73     }
     74 
     75     @Override
     76     public void updateState(Preference preference) {
     77         super.updateState(preference);
     78         updatePreference(preference);
     79     }
     80 
     81     @Override
     82     public void onStart() {
     83         mContentObserver.registerContentObserver();
     84     }
     85 
     86     @Override
     87     public void onStop() {
     88         mContentObserver.unRegisterContentObserver();
     89     }
     90 
     91     @Override
     92     public boolean onPreferenceChange(Preference preference, Object newValue) {
     93         final int progress = (int) newValue;
     94         Settings.Global.putInt(mContext.getContentResolver(),
     95                 Settings.Global.LOW_POWER_MODE_TRIGGER_LEVEL, progress);
     96         return true;
     97     }
     98 
     99     @VisibleForTesting
    100     void updatePreference(Preference preference) {
    101         final ContentResolver contentResolver = mContext.getContentResolver();
    102 
    103         // Override the max value with LOW_POWER_MODE_TRIGGER_LEVEL_MAX, if set.
    104         final int maxLevel = Settings.Global.getInt(contentResolver,
    105                 Settings.Global.LOW_POWER_MODE_TRIGGER_LEVEL_MAX, 0);
    106         if (maxLevel > 0) {
    107             if (!(preference instanceof SeekBarPreference)) {
    108                 Log.e(TAG, "Unexpected preference class: " + preference.getClass());
    109             } else {
    110                 final SeekBarPreference seekBarPreference = (SeekBarPreference) preference;
    111                 if (maxLevel < seekBarPreference.getMin()) {
    112                     Log.e(TAG, "LOW_POWER_MODE_TRIGGER_LEVEL_MAX too low; ignored.");
    113                 } else {
    114                     seekBarPreference.setMax(maxLevel);
    115                 }
    116             }
    117         }
    118 
    119         // Set the current value.
    120         final int level = Settings.Global.getInt(contentResolver,
    121                 Settings.Global.LOW_POWER_MODE_TRIGGER_LEVEL,
    122                 AutoBatterySaverPreferenceController.DEFAULT_TRIGGER_LEVEL);
    123         if (level == 0) {
    124             preference.setVisible(false);
    125         } else {
    126             preference.setVisible(true);
    127             preference.setTitle(mContext.getString(R.string.battery_saver_seekbar_title,
    128                     Utils.formatPercentage(level)));
    129             SeekBarPreference seekBarPreference = (SeekBarPreference) preference;
    130             seekBarPreference.setProgress(level);
    131             seekBarPreference.setSeekBarContentDescription(
    132                     mContext.getString(R.string.battery_saver_turn_on_automatically_title));
    133         }
    134     }
    135 
    136     /**
    137      * Observer that listens to change from {@link Settings.Global#LOW_POWER_MODE_TRIGGER_LEVEL}
    138      */
    139     private final class AutoBatterySaverSettingObserver extends ContentObserver {
    140         private final Uri mUri = Settings.Global.getUriFor(
    141                 Settings.Global.LOW_POWER_MODE_TRIGGER_LEVEL);
    142         private final ContentResolver mContentResolver;
    143 
    144         public AutoBatterySaverSettingObserver(Handler handler) {
    145             super(handler);
    146             mContentResolver = mContext.getContentResolver();
    147         }
    148 
    149         public void registerContentObserver() {
    150             mContentResolver.registerContentObserver(mUri, false, this);
    151         }
    152 
    153         public void unRegisterContentObserver() {
    154             mContentResolver.unregisterContentObserver(this);
    155         }
    156 
    157         @Override
    158         public void onChange(boolean selfChange, Uri uri, int userId) {
    159             if (mUri.equals(uri)) {
    160                 updatePreference(mPreference);
    161             }
    162         }
    163     }
    164 }
    165