Question

我的Android应用程序使用ProgressDialog。当向服务器发送http请求（RESTFul Webservice）时，会显示对话框，当从服务器接收结果时隐藏对话框

private class GetMyTimeSheetTask extends AsyncTask<String, Void, String>
{
    private ProgressDialog progress;

    protected String doInBackground(String... params) {

        MyTimeSheetFragment.this.getActivity().runOnUiThread(new Runnable() {
            public void run() {
                progress = new ProgressDialog(MyTimeSheetFragment.this.getContext());
                progress.setTitle(getResources().getString(R.string.app_name));
                progress.setMessage(getResources().getString(R.string.loading));
                progress.setProgressStyle(ProgressDialog.STYLE_SPINNER);
                progress.setCancelable(false);
                progress.show();
            }
        } );

        String result = HttpUtil.httpGet(
                params[0], params[1],
                params[2], params[3],
                params[4]);
        return result;
    }

    protected void onPostExecute(String param) {
        progress.dismiss();
        ....
        }
    }

问题是有时服务器有问题，进度对话框永远显示，我不知道如何关闭它。如何解决这个问题呢？感谢您的帮助。

Answer 1

您的HttpUtil应在发生错误时返回错误消息，并在超时时返回超时信息，以便您在收到这些异常消息时隐藏对话框。我看不到HttpUtil代码，到目前为止可能是一个解决方案：

private class GetMyTimeSheetTask extends AsyncTask<String, Void, String> {  
    private static final int REQUEST_TIMEOUT = 5000;
    private ProgressDialog progress;
    private Handler handler = new Handler(Looper.getMainLooper());
    private Runnable hideDialogTask = new Runnable(){
        @Override
        public void run() {
            progress.dismiss();
        }
   };

    protected String doInBackground(String... params) {

        MyTimeSheetFragment.this.getActivity().runOnUiThread(new Runnable(){
            public void run() {
            progress = new ProgressDialog(MyTimeSheetFragment.this.getContext());
            progress.setTitle(getResources().getString(R.string.app_name));
            progress.setMessage(getResources().getString(R.string.loading));
            progress.setProgressStyle(ProgressDialog.STYLE_SPINNER);
            progress.setCancelable(false);
            progress.show();
            handler.postDelayed(hideDialogTask, REQUEST_TIMEOUT);
        }
    } );

    String result = HttpUtil.httpGet(
            params[0], params[1],
            params[2], params[3],
            params[4]);
    return result;
}

protected void onPostExecute(String param) {
    progress.dismiss();
    ....
    }
}

Answer 2

尝试实施超时方案以及异步任务

停止不确定的进度条android

2 个答案: