Broadcast Receviewer

使用Braodcast Receiver

一.新建一个空的工程，命名为LearnBroadcastReceiver

二.为主界面添加一个按钮

三.新建一个broadcast receiver，命名为MyReceiver，并添加如下所示代码

public void onReceive(Context context, Intent intent) {
        // TODO: This method is called when the BroadcastReceiver is receiving
        // an Intent broadcast.
       System.out.println("Received the message,and the message is"+intent.getStringExtra("data"));
    }

四.在MainActivit.java中设置监听器

 protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        findViewById(R.id.btnSendMessage).setOnClickListener( this);
    }
 public void onClick(View v) {
        switch(v.getId()){
            case R.id.btnSendMessage:
                Intent i = new Intent(this,MyReceiver.class);
                i.putExtra("data","hello world");
                sendBroadcast(i);
                break;
        }
    }

五.运行结果