【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();
        }
    }
}