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;//@Overrideprotected 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@Overrideprotected void onDestroy() {super.onDestroy();unregisterReceiver(networkChangeReceiver);}//新建类继承 BroadcastReceiver 重写 onReceiveclass NetworkChangeReceiver extends BroadcastReceiver {@Overridepublic 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();}}}
}

四、效果

扩展 一个解决方案中多个项目（类似VS Studio）

修改文件名称

一个多个app

点击完成即可

以上，瑞思拜