Android :: Progress Dialog Wont Show With Async Task
Oct 10, 2010
I have been searching for an answer for this for some time now. I have an async task that downloads the database needed for my app, while this is downloading my app cant do anything as all the data it references is in this file, i have the app waiting for the file to be downloaded but i am attempting to show a progress dialog so the user knows something is happening while they wait for this to happen.however nothing shows up i have also tried directly calling ProgressDialog.show in the pre execute and moving this to the calling activity with no luck.
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Apr 24, 2010
I've got an Android activity which grabs an RSS feed from a URL, and uses the SAX parser to stick each item from the XML into an array. This all works fine but, as expected, takes a bit of time, so I want to use AsyncActivity to do it in the background. The line items = parser.getItems() works fine - items being the arraylist containing each item from the XML. The problem I'm facing is that on starting the activity, the ProgressDialog which i create in onPreExecute() isn't displayed until after the doInBackground() method has finished. i.e. I get a black screen, a long pause, then a completely populated list with the items in. Why is this happening? Why isn't the UI drawing, the ProgressDialog showing, the parser getting the items and incrementally adding them to the list, then the ProgressDialog dismissing?
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May 27, 2009
I have an app that communicates with a server.While it is communicating, it shows a progress dialog.The way this actually works is that I have a class that I call my Network Gateway.Each method takes a Handler as a callback so that the gateway can send back the response as a bundle when it has finished. Right now when someone changes orientation while a network operation is occuring, the activity doesn't know that a thread is running the network code and then the callback might be invalid.What's the right way to do this? I want to make it so that after the orientation switch, the activity can check something to see if a network operation is running and if so, display the progress dialog again and wait for the callback, or set itself as the callback handler now, invalidating the old one.My first guess is that this is exactly the kind of thing services were designed for, but I'd like specifics if anyone can supply them.
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Oct 30, 2010
-->I am new to Android And i want to show two progress dialog one after another??
-->First i want to show when my image is load from internet, when this process is done i have set A button on that Remote image.
-->When i click that button i want Dialog for second time..(on clicking button i have set video streaming code.. before video is start i want to close that Dialog..)
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Sep 29, 2010
I download some data from internet in background thread (I use AsyncTask) and display a progress dialog while downlaoding. Orientation changes, Activity is restarted and then my AsyncTask is completed.I want to dismiss the progess dialog and start a new Activity. But calling dismissDialog sometimes throws an exception (probably because the Activity was destroyed and new Activity hasn't been started yet).What is the best way to handle this kind of problem (updating UI from background thread that works even if user changes orientation)? Did someone from Google provide some "official solution"?
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Aug 13, 2009
how to show dialog with only the progress image without the rectangle, background color and text. I want only the spinning image in the dialog.
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Aug 30, 2009
I am creating an app that show a Progress dialog in AsyncTask to inform the user while web information is being fetched. I've read there are two ways of doing this: Using handlers or creating and executing an inner class that overrides the AsyncTask class. I am trying to create and executing inner class that overrides the AsyncTask class, which runs a resource-intensive thread in the background, to provide progress updates, and reports back when finished.
On the OnCreate, I have: protected Dialog onCreateDialog(int id) { return ProgressDialog.show(ListSituation.this, "", "Loading. Please wait...", true); }
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May 19, 2010
I am doing something similar to the below:
private void onCreate() {
final ProgressDialog dialog = ProgressDialog.show(this, "Please wait..", "Doing stuff..", true);
Thread t = new Thread() {
public void run() {
//do some serious stuff...
dialog.dismiss();
}
};
t.start();
t.join();
stepTwo();
}
However, what I am finding is that my progress dialog never even shows up. My App stalls for a moment so I know it is chugging along inside of thread t, but why doesnt my dialog appear? IF I remove the line: t.join(); Then what I find happens is that the progress dialog does show up, but my app starts stepTwo(); before what happens in the thread is complete..
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Aug 30, 2010
I have some data I load into the database the first time a user enters my Activity, and want to show a ProgressDialog while this data is loaded for the first time. My Activity is an ExpandableListActivity and I don't create the SimpleExpandableListAdapter or call setListAdapter passing my adapter until I'm sure the data is actually there. My onCreate looks like this:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mCategoryDbHelper = new CategoryDBHelper(this);
// Build default categories... if not there yet
CategoryDbBuilder builder = new CategoryDbBuilder(this);................
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Nov 22, 2010
I just have a concern about AsycnTask. If i have one activity which starts a async task. Now that activity goes in background and new activity gets opened & visible to us.
So the async task opened by previous activity stops or it still keeps going in background or it pauses or stops ?
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Feb 24, 2010
I don't know how to position the progress dialog(the one with the rotating image). When my application starts its display an full screen image and a progress dialog box. I need to moved the progress dialog box a little lower.
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Jul 16, 2010
What is the difference between Service, Async Task & Thread. If i am not wrong all of them are used to do some stuff in background. So, how to decide which to use and when?
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Jun 12, 2010
I read somewhere (and have observed) that starting threads is slow. I always assumed that AsyncTask created and reused a single thread because it required being started inside the UI thread.The following (anonymized) code is called from a ListAdapter's getView method to load images asynchronously. It works well until the user moves the list quickly, and then it becomes "janky".final File imageFile = new File(getCacheDir().getPath() + "/img/" + p.image);image.setVisibility(View.GONE);view.findViewById(R.id.imageLoading).setVisibility(View.VISIBLE);
(new AsyncTask<Void, Void, Bitmap>() {
@Override
protected Bitmap doInBackground(Void... params) {
try {Bitmap image;
if (!imageFile.exists() || imageFile.length() == 0) {
image = BitmapFactory.decodeStream(new URL(
"http://example.com/images/"
+ p.image).openStream());
image.compress(Bitmap.CompressFormat.JPEG, 85,
new FileOutputStream(imageFile));
image.recycle();
}image = BitmapFactory.decodeFile(imageFile.getPath(),
bitmapOptions);
return image;
} catch (MalformedURLException ex) {
// TODO Auto-generated catch block
ex.printStackTrace();
return null;
} catch (IOException ex) {
// TODO Auto-generated catch block
ex.printStackTrace();
return null;
@Override
protected void onPostExecute(Bitmap image) {
if (view.getTag() != p) // The view was recycled.
return;
view.findViewById(R.id.imageLoading).setVisibility(
View.GONE);
view.findViewById(R.id.image)
.setVisibility(View.VISIBLE);
((ImageView) view.findViewById(R.id.image))
.setImageBitmap(image);
}}).execute();I'm thinking that a queue-based method would work better, but I'm wondering if there is one or if I should attempt to create my own implementation.
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Mar 5, 2010
I have a simple app and I'm using the AsyncTask to test out a background process, for clearness purposes I've opted to put my AsyncTask in a separate class rather than in an inner class, which where my problems begin, this is my AsyncTask. Code...
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Jan 25, 2010
I am having a problem about repeating Login dialog (an AlertDialog) and progress dialog, coordinating with http thread. I suppose repetitive Login dialog (if fail, continue) handling should be common and straightforward. I guess my approach must be wrong somewhere. I already spent 2 days on this and am desperate. So please help. User starts the app, the main activity starts.Show a login dialog (generated by the main thread, i.e. from on Create. The main thread then starts a wait_thread, which will wait for http to return data and check the data and decide what to do.After user input username/password and press login, a progress dialog starts.The progress dialog starts an http_thread to talk to the server and get replies. Once done, it will notify the waiting thread.If the user type in the right username password first time, the code works fine.But it always fail for 2nd time Login, i.e. When first login fail(wrong username/ password),the wait_thread will generate 2nd Login dialog to let user repeat the login process. But after user hit the login on this 2nd Login dialog, the system always crashes.
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Nov 9, 2010
WebView webView = new WebView(this);
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setUserAgentString("Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.7 (KHTML, like Gecko) Chrome/7.0.517.44 Safari/534.7");
webView.setWebViewClient(new HelloWebViewClient());
ProgressDialog dialog = ProgressDialog.show(this, "",
"Loading. Please wait...", true);
setContentView(webView);
webView.loadUrl("http://www.preisjaeger.at");
dialog.cancel();Why does the ProgressDialog not appear?
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Mar 5, 2010
I'm App I'm doing I try to do some operations that are not very fast, and I want to add a progress dialog...
I have the next code:
CODE:..........
When I execute it, I don't see the progress dialog (but I see the program gets doing things)
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Sep 26, 2009
I've created ProgressDialog with a second thread according to the DevGuide,changes screen orientation or 2) hits the back button twice (first to hide the dialog, second to hide the app) to hide the application and run the app again after a while.Then, onCreate() is called (for the second time), and progress bar stops responding properly. My thread may work for a few minutes and I want to give the user possibility to hide it and do sth else. After a while he might want to run the app again in order to check the progress.I found a few articles concerning this topic, but I couldn't find the exact solution I should chose for this problem. So, could you tell mi what is the proper way to handle this? Should i save the handler and dialog state with "onRetainNonConfigurationInstance()"? If so, how to do it properly and is it safe?
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Sep 13, 2010
I have to show progress dialog while button click. Is there any sample code to show this.
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Apr 3, 2010
I'm using the progress dialog example from Android API Demos AlertDialogSamples.java (case DIALOG_PROGRESS). After the orientation changed the dialog is freezing with no progress anymore.
What should I change to make the example working properly after orientation change?
The piece of code is following:
CODE:...................
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Aug 21, 2009
I have an application that downloads some content from the network, processes it and displays it. When any link is clicked, the user task(async task) is used to download and process the content and the content is shown in the new activity.
I want to show a progress dialog until the content gets downloaded and processed. But when i call the progessdialog.show() method I am getting the following error.
'android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@435904d8 is not valid; is your activity running'
I use the get method to get the result from the user task. I make the main thread to wait until the usertask completes its work. I know this is a bad way, but the normal handler does not work here.I think it is not good idea to start a new activity in the onPostExecute method.
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Aug 28, 2010
I want to create a progress dialog that will be run for a predetermind time after that it will be automatically dissmissed.how to do it in android
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Apr 13, 2010
In my application i'm loading 40 images in background from web.
- At the time i need to progress dialog or progress bar in status bar (not title bar ).
- How to show it ?
- I tried so much sample programs.
- All are showing only images not progress.
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Apr 25, 2010
I am developing one application for facebook. In this application when user click on login button i start WebView acitvity there user can login. On success of login i start activity from where user pressed that login button.
Now My problem is On main activity I get all friends list from facebook. That takes some time. So i want to show ProgressDialog, however that progress dialog is not showing up in main activity.
Here is my code.
On Login success i am using this method:
CODE:...................
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Sep 26, 2010
can i keep progress dialog anywhere in activity? if possible then how can i do it?
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Sep 27, 2010
Is it possible to add any layout in progress dialog box in android??
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Nov 17, 2010
I want to make a dummy progress dialog appear for 2 or 3 seconds. It won't actually do anything other than say detecting.
I have the code:
CODE:................
But what do I put in between the show, and the dismissal to have the dialog appear for a few seconds?
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Jun 10, 2010
I have looked at the Android API and other posts here on stackoverflow, but have not been able to figure this out.
My app downloads files to the sd card. I would like to pop a "loading..." dialog while the file is downloading and then have it disappear when the download is finished. This is what i came up with using the android API:
CODE:.............
However the dialog doesn't actually show. when i debug it, it claims that it is showing, but it is obviously not on the screen.
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Nov 22, 2010
Is there a way to embed the progress bar in the UI with out an dialog. And not programmatically but with layout xml files. I am guessing it has to be some sort of animation or a "drawable"
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Jul 28, 2010
I'm facing some problems with the progress dialogs. I use a managed progress dialog to show the user that an operation is being carried out with the following code written in the onCreateDialog(int id) function.When the operation completes I call dismissDialog(PROGRESS_DIALOG). The problem is that if I rotate the phone while the progress dialog is displayed then when the operation completes the dismiss call has no effect and the progress remains showing. And this I cannot understand why.
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