Android手机点击查看手机电量Demo,android开发小项目Test 利用广播

首先给大家看一下效果图：

 ![这里写图片描述](http://img.blog.csdn.net/20160530093308263)

先写一个广播类：

package phonebroadcastreceiver.david.com.phonebroadcastreceiver;

import android.app.AlertDialog;
import android.app.Dialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;

/**
* David Zheng on 2015/11/7 15:38
*

* www.93sec.cc
*

* weibo.com/mcxiaobing
*/

/**
* 广播电池电量类
*/
public class BatteryInfoBroadcastReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
if (Intent.ACTION_BATTERY_CHANGED.equals(intent.getAction())){

        int level = intent.getIntExtra("level",0);
        //默认总电量 数值范围
        int scale = intent.getIntExtra("scale",100);

        Dialog dialog = new AlertDialog.Builder(context).setTitle(
                "电池电量"
        ).setMessage("电池电量为："+String.valueOf(level*100/scale)+"%").setNegativeButton(
                "关闭",new DialogInterface.OnClickListener(){

                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                    }
                }
        ).create();
        dialog.show();
    }
}

}

然后再用一个主类进行调用即可：

//启动广播 进行动态注册
BatteryInfoBroadcastReceiver receiver = new BatteryInfoBroadcastReceiver();
IntentFilter filter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
registerReceiver(receiver, filter);

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