BroadcastReceiver监听电量变化

  用BroadcastReceiver监听电量的变化,可以实现BroadcastReceiver接收电量变化的广播,然后获取电量百分比信息。

  BatteryChangedReceiver.java

public class BatteryChangedReceiver extends BroadcastReceiver{
    private static final String TAG="BatteryChangedReceiver";
    @Override
    public void onReceive(Context context,Intent intent){
        int currLevel=intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);//当前电量
        int total=intent.getIntExtra(BatteryManager.EXTRA_SCALE, 1);//总电量
        int percent=currLevel*100/total;
        Log.i(TAG,"battery:"+percent+"%");
    }
}

  在清单文件中注册广播接收者以及要拦截的Action:

<receiver android:name=".BatteryChangedReceiver">
    <intent-filter>
        <action android:name="android.intent.action.BATTERY_CHANGED"/>
    </intent-filter>
</receiver>

  有些时候,我们需要立即获取电量,而不是等电量变化的广播,可以通过下面的方式:

Intent batteryIntent=getApplicationContext().registerReceiver(null,new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
int currLevel=batteryIntent.getIntExtra(BatteryManager.EXTRA_LEVEL,0);
int total=batteryIntent.getIntExtra(BatteryManager.EXTRA_SCALE,1);
int percent=currLevel*100/total;
Log.i("battery","battery:"+percent+"%");

 

 

posted @ 2014-04-07 20:43  我是大嘴猴  阅读(1356)  评论(0编辑  收藏  举报