android dynamic broadcast

最新推荐文章于 2022-07-23 19:40:07 发布

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本文详细介绍了如何使用Android的动态广播机制实现特定功能，包括注册广播接收者、发送自定义广播事件以及相应的响应处理。通过实例展示了动态广播在实际开发中的应用，旨在帮助开发者理解和掌握这一关键的Android开发技巧。

package com.albert.dynamicbroadcast;

import android.os.Bundle;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import android.support.v4.app.NavUtils;

public class MainActivity extends Activity {

int m=3;

final String ACTION="myaction";

   MyBroadCastReceiver receiver;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button btn1 = (Button) this.findViewById(R.id.register);

        btn1.setOnClickListener(new View.OnClickListener() {

           public void onClick(View v) {

               IntentFilter intentFilter = new IntentFilter(ACTION);
               receiver = new MyBroadCastReceiver();
               MainActivity.this.registerReceiver(receiver,intentFilter);
           }
       });

        Button btn2 = (Button) this.findViewById(R.id.send);
        btn2.setOnClickListener(new View.OnClickListener() {

           public void onClick(View v) {
               // TODO Auto-generated method stub
               new Thread(new Runnable()
               {
                   public void run() {
                       // TODO Auto-generated method stub
                       Intent intent = new Intent();
                       intent.setAction(ACTION);
                       MainActivity.this.sendBroadcast(intent);
                   }
               }).start();
           }
       });

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

    class MyBroadCastReceiver extends BroadcastReceiver
    {
       @Override
       public void onReceive(Context arg0, Intent arg1) {
           Toast.makeText(getApplicationContext(), m+"", Toast.LENGTH_LONG).show();
           MainActivity.this.unregisterReceiver(receiver);
       }
    }
}