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      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 
     17 package com.android.settings.fuelgauge;
     18 
     19 import android.content.BroadcastReceiver;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.content.IntentFilter;
     23 import android.support.annotation.VisibleForTesting;
     24 
     25 import com.android.settings.Utils;
     26 
     27 /**
     28  * Use this broadcastReceiver to listen to the battery change, and it will invoke
     29  * {@link OnBatteryChangedListener} if any of the following happens:
     30  *
     31  * 1. Battery level has been changed
     32  * 2. Battery status has been changed
     33  */
     34 public class BatteryBroadcastReceiver extends BroadcastReceiver {
     35 
     36     interface OnBatteryChangedListener {
     37         void onBatteryChanged();
     38     }
     39 
     40     @VisibleForTesting
     41     String mBatteryLevel;
     42     @VisibleForTesting
     43     String mBatteryStatus;
     44     private OnBatteryChangedListener mBatteryListener;
     45     private Context mContext;
     46 
     47     public BatteryBroadcastReceiver(Context context) {
     48         mContext = context;
     49     }
     50 
     51     @Override
     52     public void onReceive(Context context, Intent intent) {
     53         updateBatteryStatus(intent, false /* forceUpdate */);
     54     }
     55 
     56     public void setBatteryChangedListener(OnBatteryChangedListener lsn) {
     57         mBatteryListener = lsn;
     58     }
     59 
     60     public void register() {
     61         final Intent intent = mContext.registerReceiver(this,
     62                 new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
     63         updateBatteryStatus(intent, true /* forceUpdate */);
     64     }
     65 
     66     public void unRegister() {
     67         mContext.unregisterReceiver(this);
     68     }
     69 
     70     private void updateBatteryStatus(Intent intent, boolean forceUpdate) {
     71         if (intent != null && mBatteryListener != null && Intent.ACTION_BATTERY_CHANGED.equals(
     72                 intent.getAction())) {
     73             String batteryLevel = Utils.getBatteryPercentage(intent);
     74             String batteryStatus = Utils.getBatteryStatus(
     75                     mContext.getResources(), intent);
     76             if (forceUpdate || !batteryLevel.equals(mBatteryLevel) || !batteryStatus.equals(
     77                     mBatteryStatus)) {
     78                 mBatteryLevel = batteryLevel;
     79                 mBatteryStatus = batteryStatus;
     80                 mBatteryListener.onBatteryChanged();
     81             }
     82         }
     83     }
     84 
     85 }