Question

我想知道我是否连接到服务器，如果没有连接显示消息，我一直在使用此代码，但无法使其正常工作，

CODE：

public boolean isConnectedToServer(String url, int timeout) {
try{
    URL myUrl = new URL(url);
    URLConnection connection = myUrl.openConnection();
    connection.setConnectTimeout(timeout);
    connection.connect();
    return true;
} catch (Exception e) {
    // IN THIS PART I ADDED A TOAST, TO SHOW A MESSAGE WHEN THERE NO CONNECTION BUT IT ALWAYS SHOWS IT WHEATER THERE IS OR NOT.
    return false;
 }
}

使用我在开始条件时添加的相同代码

如果：

   if (!isConnectedToServer("http://vil/ong.php", 60)) {
        new AlertDialog.Builder(this.getActivity())
                .setTitle("Connected")
                .setMessage("You are connected to server")
                .create().show();
    } else {
        new AlertDialog.Builder(this.getActivity())
                .setTitle("Not Connected")
                .setMessage("You are not connected to server")
                .create().show();
    }

例外：

我收到了错误

java.net.SocketTimeoutException: failed to connect to http://vil/ong.php (port 80) after 60ms
  at libcore.io.IoBridge.connectErrno(IoBridge.java:169)
  at libcore.io.IoBridge.connect(IoBridge.java:122)
  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:452)
  at java.net.Socket.connect(Socket.java:884)
  at com.android.okhttp.internal.Platform.connectSocket(Platform.java:117)
  at com.android.okhttp.internal.http.SocketConnector.connectRawSocket(SocketConnector.java:438)
  at com.android.okhttp.internal.http.SocketConnector.connectCleartext(SocketConnector.java:105)
  at com.android.okhttp.Connection.connect(Connection.java:1333)
  at com.android.okhttp.Connection.connectAndSetOwner(Connection.java:1412)
  at com.android.okhttp.OkHttpClient$1.connectAndSetOwner(OkHttpClient.java:131)
  at com.android.okhttp.internal.http.HttpEngine.nextConnection(HttpEngine.java:481)
  at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:462)
  at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:368)
  at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:476)
  at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:118)
  at com.example.lupitagarcia.yosoyvallarta.Reportes.isConnectedToServer(Reportes.java:408)
  at com.example.lupitagarcia.yosoyvallarta.Reportes.onMapReady(Reportes.java:110)
  at com.google.android.gms.maps.MapView$zza$1.zza(Unknown Source)
  at com.google.android.gms.maps.internal.zzt$zza.onTransact(Unknown Source)
  at android.os.Binder.transact(Binder.java:387)
  at er.b(:com.google.android.gms.DynamiteModulesB@11951434:20)
  at com.google.android.gms.maps.internal.bf.a(:com.google.android.gms.DynamiteModulesB@11951434:5)
  at com.google.maps.api.android.lib6.impl.bc.run(:com.google.android.gms.DynamiteModulesB@11951434:5)
  at android.os.Handler.handleCallback(Handler.java:739)
  at android.os.Handler.dispatchMessage(Handler.java:95)
  at android.os.Looper.loop(Looper.java:148)
  at android.app.ActivityThread.main(ActivityThread.java:7406)
  at java.lang.reflect.Method.invoke(Native Method)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

但是AGAIN它显示了相同的信息，对于这两种情况，所以我真的不知道为什么会发生这种情况，我真的很感激如何解决这个问题。

Answer 1

您收到SocketTimeoutException，这表示连接到您的网址需要花费太多时间。因此，Java会输入您的catch块，并返回false。

您需要检查您是否可以访问互联网，以及您的网址是否正确。另请注意，只能从UI线程显示Toast，并且应在不同的线程上调用网络操作;不是UI线程。由于您的Toast正在显示，我假设您在UI线程上进行了错误的网络操作。

与服务器的连接显示相同的警报对话框（即使没有连接）

1 个答案: