java - 互联网连接监听器在 Android Studio 中不起作用

Question

我正在尝试创建一个 Internet 连接监听器。但不工作。我没有收到任何错误。我认为 NetworkStateChangeReceiver 根本不起作用。因为log.e并没有出现在logcat中。我是 Android 新手，这对我来说很复杂。

Android list

<receiver
        android:name=".NetworkStateChangeReceiver">
        <intent-filter >
            <action android:name="com.gdm.retailalfageek.NetworkAvailable" />
        </intent-filter>
    </receiver>

NetworkStateChangeReceiver.java

public class NetworkStateChangeReceiver extends BroadcastReceiver {

public static final String NETWORK_AVAILABLE_ACTION = "com.gdm.retailalfageek.NetworkAvailable";
public static final String IS_NETWORK_AVAILABLE = "isNetworkAvailable";

@Override
public void onReceive(Context context, Intent intent) {
    Intent networkStateIntent = new Intent(NETWORK_AVAILABLE_ACTION);
    networkStateIntent.putExtra(IS_NETWORK_AVAILABLE,  getConnectionType(context));
    LocalBroadcastManager.getInstance(context).sendBroadcast(networkStateIntent);
    Log.e("Network Available ", "On receive called");
}

@IntRange(from = 0, to = 2)
public static int getConnectionType(Context context) {
    int result = 0; // Returns connection type. 0: none; 1: mobile data; 2: wifi
    ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        if (cm != null) {
            NetworkCapabilities capabilities = cm.getNetworkCapabilities(cm.getActiveNetwork());
            Log.e("Network Available ", "On receive called");
            if (capabilities != null) {
                if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
                    Log.e("Network Available ", "On receive called");
                    result = 2;
                } else if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                    Log.e("Network Available ", "On receive called");
                    result = 1;
                }
            }
        }
    } else {
        if (cm != null) {
            NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
            if (activeNetwork != null) {
                Log.e("Network Available ", "On receive called");
                // connected to the internet
                if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {
                    Log.e("Network Available ", "On receive called");
                    result = 2;
                } else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
                    Log.e("Network Available ", "On receive called");
                    result = 1;
                }
            }
        }
    }
    return result;
}}

应用程序类

     @Override
  public void onCreate() {
    super.onCreate();

    IntentFilter filter = new IntentFilter();
    filter.addAction("isNetworkAvailable");
    registerReceiver(new NetworkStateChangeReceiver(), filter);

  }

Answer 1

希望下面给出的代码对您有所帮助。

1. 在Manifest.file中注册BroadcastReceiver

   <receiver android:name=".MyBroadcastReceiver" > 
   <intent-filter>
   <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
   </intent-filter>
   </receiver>
   

2. 在 list 中设置互联网权限

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

3. 实现接收类。

       public class MyBroadcastReceiver extends BroadcastReceiver {
       @Override
       public void onReceive(Context context, Intent intent) {
           // This will execute upon receiving event
       }
       }