安卓Broadcast Receiver（广播消息）应用实例

Posted 2020-10-11 浮生缘，半生梦

 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）

 1 package com.example.playmessage;
 2 
 3 import android.app.Activity;
 4 import android.content.Intent;
 5 import android.os.Bundle;
 6 import android.view.Menu;
 7 import android.view.MenuItem;
 8 import android.view.View;
 9 import android.view.View.OnClickListener;
10 import android.widget.Button;
11 
12 public class MainActivity extends Activity {
13     Button ob1;
14     Intent intent;
15     @Override
16     protected void onCreate(Bundle savedInstanceState) {
17         super.onCreate(savedInstanceState);
18         setContentView(R.layout.activity_main);
19         
20         ob1=(Button) findViewById(R.id.bu1);  //按钮
21         intent=new Intent("com.example.playmessage");   //设置唯一标识
22         ob1.setOnClickListener(new OnClickListener() {
23             
24             @Override
25             public void onClick(View v) {
26                 // TODO Auto-generated method stub
27                 sendBroadcast(intent);         //发送广播
28                 
29             }
30         });
31         
32         
33     }
34 
35 
36 }

Broadcast-Receiver

 1 package com.example.playmessage;
 2 
 3 import android.content.BroadcastReceiver;
 4 import android.content.Context;
 5 import android.content.Intent;
 6 import android.media.MediaPlayer;
 7 import android.widget.Toast;
 8 
 9 public class MyReceiver extends BroadcastReceiver {
10     public MyReceiver() {
11     }
12      MediaPlayer play;
13     @Override
14     public void onReceive(Context context, Intent intent) {
15         // TODO: This method is called when the BroadcastReceiver is receiving
16         // an Intent broadcast.
17         Toast.makeText(context, "收到广播，播放音乐",2).show();;
18         play=MediaPlayer.create(context,R.raw.sleep);
19         play.start();
20         
21     }
22 }

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>