Question

这是奇怪的事情，有时当我来到我的活动时，它会调用asyncTask，这是我使用ProgressDialog的代码

ProgressDialog ringProgressDialog ;

@Override
protected void onPreExecute()
{
    super.onPreExecute();
    ringProgressDialog= ProgressDialog.show(Myactivity.this, null,"message", true);

}

@Override
protected void onPostExecute(String result)
{
    super.onPostExecute(result);
    ringProgressDialog.dismiss();
}

有一天asynctask得到错误，我想发布错误，但不知怎的，我没有错误。

这是什么问题？为什么它有时会出错，有时它运行正常？我确定问题来自progressDialog。

谢谢

Answer 1

ProgressDialog ringProgressDialog ;
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
             ringProgressDialog= ProgressDialog.show(getApplicationContext(), null,"message", true);

        }

        @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);
            if(ringProgressDialog.isShowing())
            ringProgressDialog.dismiss();
        }

Answer 2

以其他方式尝试

ProgressDialog pDialog;

protected void onPreExecute() {
            super.onPreExecute();
            // Showing progress dialog
            pDialog = new ProgressDialog(Activity.this);
            pDialog.setMessage("Fetching News...");
            pDialog.setCancelable(false);
            pDialog.show();
        }

Answer 3

请尝试这种方式，希望这有助于您解决问题。

   public void getDataFromServer(final Context context){

        new AsyncTask<Void,Void,Void>(){
            ProgressDialog ringProgressDialog ;
            @Override
            protected void onPreExecute() {
                super.onPreExecute();
                ringProgressDialog= ProgressDialog.show(context, null,"message", true);
            }

            @Override
            protected Void doInBackground(Void... params) {
                // write your service call code here
                return null;
            }

            @Override
            protected void onPostExecute(Void aVoid) {
                super.onPostExecute(aVoid);
                ringProgressDialog.dismiss();
            }
        }.execute();
    }

Answer 4

ProgressDialog pDialog;

protected void onPreExecute() {
            super.onPreExecute();
            // Showing progress dialog
            pDialog = new ProgressDialog("Your Activity");
            pDialog.setMessage("Your message");
            pDialog.setCancelable(false);
            pDialog.show();
        }

  @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);
           pDialog.dismiss();
        }

ProgressDialog有时会在asyncTask中出错

4 个答案: