安卓Broadcast Receiver（广播消息）应用实例

 利用Intent发送广播消息，广播消息的内容可以是应用程序相关的数据信息，也可以是Android的系统消息例如：网络连接变化、电池电量变化、接收短信或系统设置变化。

  截图：

代码：（主Activity）

package com.example.playmessage;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {
    Button ob1;
    Intent intent;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        ob1=(Button) findViewById(R.id.bu1);  //按钮
        intent=new Intent("com.example.playmessage");   //设置唯一标识
        ob1.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                sendBroadcast(intent);         //发送广播
                
            }
        });
        
        
    }


}

Broadcast-Receiver

package com.example.playmessage;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.widget.Toast;

public class MyReceiver extends BroadcastReceiver {
    public MyReceiver() {
    }
     MediaPlayer play;
    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO: This method is called when the BroadcastReceiver is receiving
        // an Intent broadcast.
        Toast.makeText(context, "收到广播，播放音乐",2).show();;
        play=MediaPlayer.create(context,R.raw.sleep);
        play.start();
        
    }
}

需要在清单文件中Broadcast-Receiver下添加Intent的过滤

<intent-filter>

      <action android:name="  设置的唯一标识 " />

<intent-filter>