获取设备电量的aide代码

一、创建广播接收器

package com.mx.getdl;
import android.content.BroadcastReceiver;
import android.content.Intent;
import android.content.Context;
import android.widget.Toast;

/**
 * 获取设备电量的aide代码
 * Created by 梦雪 on 2019/11/14.
 */
public class BatteryReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context p1, Intent p2) {
        //获取当前电量
        int current=p2.getExtras().getInt("level");
        //获取总电量
        int total=p2.getExtras().getInt("scale");
        Toast.makeText(p1, "当前电量：" + current + "%\n" + "总电量：" + total, Toast.LENGTH_LONG).show();
    }

}

二、动态注册广播

package com.mx.getdl;

import android.app.Activity;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;

public class MainActivity extends Activity { 
    private BatteryReceiver battery;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //设置接收广播的类型
        IntentFilter filter=new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        //实例化BatteryReceiver广播接收器
        battery = new BatteryReceiver();
        //动态注册广播
        registerReceiver(battery, filter);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        //摧毁广播
        unregisterReceiver(battery);
    }

} 

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