用广播(BroadcastReceiver)监听电池的变化

如果我们想要监听电池电量的变化，只是使用监听事件的话，当我们程序没有运行，就监听不到电池电量的改变，这时候就需要使用广播了，这里就介绍一下广播监听电池的使用，以及一些电池的属性

<pre name="code" class="java">package com.example.butterydemo;

import android.os.BatteryManager;
import android.os.Bundle;
import android.util.Log;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;

public class MainActivity extends Activity {
BatteryBroadcast bb;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

/*
* 代码注册
*/
// 创建广播对象
bb = new BatteryBroadcast();
// 创建意图对象
IntentFilter iFilter = new IntentFilter();
// 添加电池改变的活动
iFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
registerReceiver(bb, iFilter);
}

@Override
protected void onDestroy() {
super.onDestroy();
//注销
unregisterReceiver(bb);
}

/**
* 监控电池的广播
*/
public class BatteryBroadcast extends BroadcastReceiver {

/**
* 当电池电量发生改变时会执行此方法
*/
@Override
public void onReceive(Context context/* 触发广播的Activity */, Intent intent/* 触发广播的意图 */) {
Bundle extras = intent.getExtras();//获取意图中所有的附加信息
//获取当前电量，总电量
int level = extras.getInt(BatteryManager.EXTRA_LEVEL/*当前电量*/, 0);
int total = extras.getInt(BatteryManager.EXTRA_SCALE/*总电量*/, 100);

//电池温度温度
int temperature = extras.getInt(BatteryManager.EXTRA_TEMPERATURE/*电池温度*/);

Log.d("温度", temperature+"");
Log.e("电量", level+"");
Log.wtf("电量", total+"");

//电池状态
int status = extras.getInt(BatteryManager.EXTRA_STATUS/*电池状态*/);
switch (status) {
case BatteryManager.BATTERY_STATUS_CHARGING://充电
break;
case BatteryManager.BATTERY_STATUS_DISCHARGING://放电
break;

case BatteryManager.BATTERY_STATUS_FULL://充满
break;
//BatteryManager.BATTERY_STATUS_NOT_CHARGING，未充电，包括放电和充满
//BATTERY_STATUS_UNKNOWN：未知状态
default:
break;
}

//电池健康程度
int health = extras.getInt(BatteryManager.EXTRA_HEALTH);
switch (health) {
case BatteryManager.BATTERY_HEALTH_GOOD://健康状态
break;
case BatteryManager.BATTERY_HEALTH_OVERHEAT://过热
break;
case BatteryManager.BATTERY_HEALTH_COLD://过冷
break;
case BatteryManager.BATTERY_HEALTH_OVER_VOLTAGE://电压过高
break;
default://其他三个放在default中。dead、unknown、unspecial failure
break;
}
}

}

}