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);
}
}

}
}