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 {
onBatteryChanged()37         void onBatteryChanged();
38     }
39 
40     @VisibleForTesting
41     String mBatteryLevel;
42     @VisibleForTesting
43     String mBatteryStatus;
44     private OnBatteryChangedListener mBatteryListener;
45     private Context mContext;
46 
BatteryBroadcastReceiver(Context context)47     public BatteryBroadcastReceiver(Context context) {
48         mContext = context;
49     }
50 
51     @Override
onReceive(Context context, Intent intent)52     public void onReceive(Context context, Intent intent) {
53         String action = intent.getAction();
54         if (mBatteryListener != null && Intent.ACTION_BATTERY_CHANGED.equals(action)
55                 && updateBatteryStatus(intent)) {
56             mBatteryListener.onBatteryChanged();
57         }
58     }
59 
setBatteryChangedListener(OnBatteryChangedListener lsn)60     public void setBatteryChangedListener(OnBatteryChangedListener lsn) {
61         mBatteryListener = lsn;
62     }
63 
register()64     public void register() {
65         mContext.registerReceiver(this,
66                 new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
67     }
68 
unRegister()69     public void unRegister() {
70         mContext.unregisterReceiver(this);
71     }
72 
updateBatteryStatus(Intent intent)73     private boolean updateBatteryStatus(Intent intent) {
74         if (intent != null) {
75             String batteryLevel = Utils.getBatteryPercentage(intent);
76             String batteryStatus = Utils.getBatteryStatus(
77                     mContext.getResources(), intent);
78             if (!batteryLevel.equals(mBatteryLevel) || !batteryStatus.equals(mBatteryStatus)) {
79                 mBatteryLevel = batteryLevel;
80                 mBatteryStatus = batteryStatus;
81                 return true;
82             }
83         }
84         return false;
85     }
86 
87 }