简单的广播发送与接收

 public class MainActivity extends Activity { //先在布局文件main.xml中定义一个Button
/*
  * 
  * <Button
  *  android:layout_width="fill_parent" 
  *  android:layout_height="wrap_content"
  *  android:text="@string/button_send"
  *  android:id="@+id/send_broadcast_button"
  *  />
  * 
  */


private Button send_broadcast_button; @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        send_broadcast_button = (Button) this.findViewById(R.id.send_broadcast_button);
        send_broadcast_button.setOnClickListener(new SendBroadcast());
    }
private class SendBroadcast implements View.OnClickListener {  @Override
  public void onClick(View v) {
   
   Intent intent = new Intent();
   intent.setAction("cn.abel.action.broadcast");
   
   //要发送的内容
   intent.putExtra("author", "Abel");
   
   //发送 一个无序广播
   MainActivity.this.sendBroadcast(intent);
  }
  
}
}

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("cn.abel.action.broadcast");
        this.registerReceiver(new MyBroadcastReciver(), intentFilter);
    }
    private class MyBroadcastReciver extends BroadcastReceiver {  @Override
  public void onReceive(Context context, Intent intent) {
   String action = intent.getAction();
   if(action.equals("cn.abel.action.broadcast")) {
    String author = intent.getStringExtra("author");
    
    //在控制台显示接收到的广播内容
    System.out.println("author==>"+author);
    
    //在android端显示接收到的广播内容
    Toast.makeText(MainActivity.this, author, 1).show();
    
    //在结束时可取消广播
    //MainActivity.this.unregisterReceiver(this);
   }
  }
     
    }
}