互联网连接侦听器在安卓工作室中不起作用

Question

我正在尝试创建一个互联网连接侦听器。但不起作用。我没有犯任何错误。我认为NetworkStateChangeReceiver根本不起作用。因为 Log.e 不会出现在日志猫中。我是Android的新手，这对我来说很复杂。

安卓清单

<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 中注册广播接收器

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

2. 在清单中设置互联网权限

   <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
   }
   }