[安卓广播入门][1]Android Studio接收系统广播

最新推荐文章于 2024-06-06 15:50:06 发布

岔路ko

最新推荐文章于 2024-06-06 15:50:06 发布

阅读量403

点赞数

分类专栏：安卓爬坑文章标签： android android studio ide

本文链接：https://blog.youkuaiyun.com/u011993802/article/details/131152597

版权

安卓爬坑专栏收录该内容

7 篇文章

订阅专栏

本文介绍了如何在Android应用中创建一个新的项目，并添加权限ACCESS_NETWORK_STATE来检测网络连接状态。通过创建BroadcastReceiver子类NetworkChangeReceiver，并在onReceive方法中检查网络是否可用，实现了网络状态的变化提醒。应用在销毁时会取消对广播的注册。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

一、新建项目

二、增加权限

  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

三、代码

public class MainActivity extends AppCompatActivity {

    private IntentFilter intentFilter;//过滤隐式意图
    private NetworkChangeReceiver networkChangeReceiver;//


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        
        intentFilter = new IntentFilter();
        intentFilter.addAction("android.net.conn.CONNECTIVITY_CHANGE");//过滤的方法
        networkChangeReceiver = new NetworkChangeReceiver();
        registerReceiver(networkChangeReceiver, intentFilter);//注册
        
    }

//取消订阅广播
    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(networkChangeReceiver);
    }

//新建类继承 BroadcastReceiver 重写 onReceive
    class NetworkChangeReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            ConnectivityManager connectionManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo networkInfo = connectionManager.getActiveNetworkInfo();
            if (networkInfo != null && networkInfo.isAvailable()) {
                Toast.makeText(context, "network is available", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(context, "network is unavailable", Toast.LENGTH_SHORT).show();
            }

        }
    }
}