onProgressUpdate 仅在 AsyncTask 结束时调用（创建套接字）

Question

我正在尝试在套接字建立连接时显示“等待”对话框。你知道为什么这段代码不起作用吗？

onProgressUpdate 在 doInBackground 结束时被调用。我打算在 connectionSocket.connect 超时之前显示它。

以下位

dialog = connection.dialog("progress");
        dialog.show();

单独使用效果很好！

@Override
    protected Boolean doInBackground(String... ip) {
        Log.i("CONNECTION","doInBackground : Creating socket");
        Boolean result = false;
        try {
            publishProgress();
            connectionSocket = new Socket();
            connectionSocket.connect(new InetSocketAddress(ip[0], connection.getServerPort()), 5000);
            publishProgress();
            Log.i("CONNECTION","doInBackground : Socket created");
            result = true;
        } catch (UnknownHostException e) {
            Log.i("CONNECTION","doInBackground : Error creating socket. UnknownHostException");
        } catch (IOException ioe) {
            Log.i("CONNECTION","doInBackground : Error creating socket. IOException");
        }
        return result;
    }

   @Override
    protected void onProgressUpdate(Void... values) {
        super.onProgressUpdate(values);
        Log.i("CONNECTION","onProgressUpdate");
        dialog = connection.dialog("progress");
        dialog.show();
    }

感谢您的帮助：*

Answer 1

您需要在 onPreExecute 中显示对话框，而不是在 onProgressUpdate 中。 OnProgressUpdate 用于长时间操作，您手头的任务有特定百分比的更新。

@Override
protected void onPreExecute() {
    dialog = connection.dialog("progress");
    dialog.show();
}