【Android】动态注册广播接收器

import android.app.Activity;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.os.Bundle;import android.util.Log;import android.widget.Toast; public class MainActivity extends Activity {     //定义一个过滤器；    private IntentFilter intentFilter;     //定义一个广播监听器；    private NetChangReceiver netChangReceiver;     @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.fragment_main);         //实例化过滤器；        intentFilter = new IntentFilter();        //添加过滤的Action值；        intentFilter.addAction(Intent.ACTION_AIRPLANE_MODE_CHANGED);         //实例化广播监听器；        netChangReceiver = new NetChangReceiver();         //将广播监听器和过滤器注册在一起；        registerReceiver(netChangReceiver, intentFilter);    }     @Override    protected void onDestroy() {        // TODO Auto-generated method stub        super.onDestroy();         //销毁Activity时取消注册广播监听器；        unregisterReceiver(netChangReceiver);    }     //创建一个继承BroadcastReceiver的广播监听器；    class NetChangReceiver extends BroadcastReceiver {         //重写onReceive方法，该方法的实体为，接收到广播后的执行代码；        @Override        public void onReceive(Context context, Intent intent) {            // TODO Auto-generated method stub            Log.i("MainActivity", "飞行模式启动~");             Toast.makeText(MainActivity.this, "飞行模式启动~", Toast.LENGTH_SHORT)                    .show();        }    }}
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