java - android中如何显示未连接互联网

Question

我需要帮助。我想要一个 toast 来显示我的应用程序中的互联网状态。它适用于 wifi 和移动数据包(移动互联网)。但当互联网完全断开时，它什么也没有显示。我不知道该怎么做。这是我的代码

public class ConnectivityReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
    Log.d("myapp", "action: " + intent.getAction());
    ConnectivityManager cm =
            (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
    boolean isConnected = activeNetwork != null &&
                          activeNetwork.isConnectedOrConnecting();

     if(isConnected)
     {
     if(activeNetwork.getType() == ConnectivityManager.TYPE_WIFI)
     {
         Toast toast = Toast.makeText(context, "Connected to wifi", Toast.LENGTH_LONG);
         toast.show();
     }
     else if(activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE)
     {
         Toast toast = Toast.makeText(context, "Connected to Mobile Data Pakage", Toast.LENGTH_LONG);
         toast.show();

     }
     else 
      {
         Toast toast = Toast.makeText(context, "Not Connected", Toast.LENGTH_LONG);
         toast.show();

      }

也尝试一下，但编译器显示错误。请帮助我。提前致谢。

 else if(activeNetwork.getType() == ConnectivityManager.EXTRA_NO_CONNECTIVITY)
      {
                                                                                  Toast toast = Toast.makeText(context, "Not Connected", Toast.LENGTH_LONG);
         toast.show();

声明

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

Answer 1

公共(public)类ConnectionDetector{

private Context _context;

public ConnectionDetector(Context context){
    this._context = context;
}

public boolean isConnectingToInternet(){
    ConnectivityManager connectivity = (ConnectivityManager) _context.getSystemService(Context.CONNECTIVITY_SERVICE);
      if (connectivity != null) 
      {
          NetworkInfo[] info = connectivity.getAllNetworkInfo();
          if (info != null) 
              for (int i = 0; i < info.length; i++) 
                  if (info[i].getState() == NetworkInfo.State.CONNECTED)
                  {
                      return true;
                  }

      }
      return false;
}

}

创建这个类

并在您的接收器 onreceive 中使用 isConnecting to internet 方法应该可以正常工作

也许编码:)