[置顶] 【Android】Android开发点击查看手机电量的小功能。学习广播的一个小技能小Demo

package david.qq986945193.com.davidphonebroadcastreceivershowelectricity;

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

/**
* @author ：程序员小冰
* @新浪微博 ：http://weibo.com/mcxiaobing
* @GitHub:https://github.com/QQ986945193
* @CSDN博客: http://blog.csdn.net/qq_21376985 * @交流Qq ：986945193
*/
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();
}
}
}

/**
* 动态注册广播
*/
BatteryInfoBroadcastReceiver receiver = new BatteryInfoBroadcastReceiver();
IntentFilter filter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
registerReceiver(receiver, filter);