好吧,我正在尝试获取一个进度对话框,以显示何时从互联网下载数据并将其应用于用户界面。我的 asynctask 工作正常,它运行所有步骤,但它从未显示对话框。我不知道我在这里做错了什么,我几乎碰壁了。我什至尝试将异步任务放入新的可运行线程中并像这样运行它,这也没有显示对话框。我这样调用异步任务
new runningMan().execute();
这是我尝试运行的代码。
private class runningMan extends AsyncTask<Void, Void, Integer>
{
@Override
protected void onPreExecute() {
super.onPreExecute();
Log.d("Runningman: ", "Started running");
//this method will be running on UI thread
progress = ProgressDialog.show(PromotionMain.this, "Loading", "PleaseWait", true);
}
@Override
protected Integer doInBackground(Void... params) {
//parse the JSON string
JSONParser jp = new JSONParser();
try {
Log.d(username , password);
jp.parsesData(promos, myJson, pictureArray, pathArray, labelArray);
Log.d("Runningman: ", "Finished parsing");
} catch (IOException e) {
e.printStackTrace();
}
return 1;
}
@Override
protected void onPostExecute(Integer result) {
super.onPostExecute(result);
ArrayList<ListItem> listData = getListData();
fillListView(listData);
Log.d("Runningman: ", "Finished runing");
//this method will be running on UI thread
progress.dismiss();
}
}
感谢您对此提供的任何帮助。
最佳答案
调用“super.onPreExecute();”和“super.onPostExecute(结果);”在进度对话框的代码之后。或者更好的是,摆脱他们(如果你没有理由调用他们)。
使用以下代码:
private class runningMan extends AsyncTask<Void, Void, Integer>
{
@Override
protected void onPreExecute() {
Log.d("Runningman: ", "Started running");
//this method will be running on UI thread
progress = ProgressDialog.show(PromotionMain.this, "Loading", "PleaseWait", true);
super.onPreExecute();
}
@Override
protected Integer doInBackground(Void... params) {
//parse the JSON string
JSONParser jp = new JSONParser();
try {
Log.d(username , password);
jp.parsesData(promos, myJson, pictureArray, pathArray, labelArray);
Log.d("Runningman: ", "Finished parsing");
} catch (IOException e) {
e.printStackTrace();
}
return 1;
}
@Override
protected void onPostExecute(Integer result) {
ArrayList<ListItem> listData = getListData();
fillListView(listData);
Log.d("Runningman: ", "Finished runing");
//this method will be running on UI thread
progress.dismiss();
super.onPostExecute(result);
}
}
关于android - 异步任务调用期间未显示进度对话框,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/36706544/