Android :: Background Task / Progress Dialog / Orientation Change / Any 100% Working Solution?
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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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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Jul 10, 2009
My program does some network activity in a background thread. Before starting, it pops up a progress dialog. The dialog is dismissed on the handler.This all works fine, except when screen orientation changes while the dialog is up (and the background thread is going). At this point the app either crashes, or deadlocks, or gets into a weird stage where the app does not work at all until all the threads have been killed.How can I handle the screen orientation change gracefully?
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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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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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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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May 14, 2009
I have created an activity for my game which handles all orientation changes by itself and has a fixed "portrait" layout. Actually it uses the accelerometer and is rendered using 2D canvas methods. If the level has been completed I show up a highscore dialog in which the user can enter his name. The dialog is floating above the underlying level screen which gets blurred out nicely. This generally works.
Problem is that the dialog does not get rotated if the orientation of the phone changes. So even if the keyboard is exposed the dialog is shown in portrait mode instead of landscape. I have tried to use an activity with dialog theme instead but the behavior didn't change. After several tries it seems that I have found the reason for this: Once there's an activity with fixed orientation in the activity stack then all subsequent activities keep this orientation, too. They will not react on orientation changes anymore (e.g. if the keyboard gets exposed).
After upgrading to 1.5 SDK the described behavior changed a little bit. Now at subactivities indead react on orientation changes like expected. However, the need to have an opaque background! That means that neither dialogs nor activities with dialog theme will work. Those will stick with the orientation of the underlaying activity. So my workaround is to first start a sub-activity with an opaque black background. This activity then shows my highscore dialog on top. It looks quite okay but I wonder if there's a better solution? Is it possible to show a dialog above a fixed portrait or landscape activity which automatically adapts to orientation changes?
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Jul 27, 2010
Trouble is, that ProgressDialog show only after loading run(), but I need to show it on start and showing it while loading some data. I put: "dialog = ProgressDialog.show(CategoriesListActivity.this,"Working...","Loading data", true);" in method run(), but the same. I print in Log.i() some info (int i++) and put title of ProgressDialog. Method work correctly, but don't show ProgressDialog. I have read some info that some thread block another thread (my created), that's why doesn't show progressDialog, but can't do anything.
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Aug 2, 2010
I'm developing an android app and need to know how to change the positioning of a progress dialog. I need it to be positioned at the bottom of the screen instead of at the center like it is by default.
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Apr 15, 2010
Is it possible to change the font size of the detail message text in the Progress Dialog? Or will I have to create a custom Progress Box?
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Jun 23, 2010
built a simple app that displays an alertDialog with two buttons.The problem is it's not getting dismissed when i change orientation. After change i get a leak warning on debugger and the dialog appears twice(pressing back hides the first dialog, only a second back dismisses it completely).
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Jun 8, 2010
I have an image set as my background and when it is vertical, the image looks fine. However, when the orentation is changed, the image get streched out. If there a way that I can change the image based on the orentation of the device?
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Apr 6, 2010
i've developed an android app that's fetches an xml file and displays this data via several markers on the map. This works fine so far. The problem right now is that when i switch the orientation of the phone (portrait->landscape or vice versa) the markers disappear for a small moment, the xml processing is started again and then they reappear. Is there a way to prevent this re-loading of the file? It only takes about 2-3 seconds.
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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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May 19, 2010
I start a number of background threads in my Activity onCreate that do work to keep the UI free. I was originally destroying these threads in onDestroy. However, the idea of shutting down and restarting these background threads every time there is an orientation change seems like a waste of time to me. What is the preferred way of avoiding the shutdown of my background threads on an orientation change? I supposed I could set a flag in onSaveInstanceState and then not destroy my threads if this flag is set. Is this a valid approach or is there a more standard framework approach that I am overlooking?
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Jun 25, 2010
This seems to be an Android-wide problem, which you can see in API demos under Views -> Progress Bar -> Dialogs. Basically, if you show a progress dialog, it works as expected the first time around. If you dismiss it and show it again (without destroying the activity or anything like that), the spinning image stops spinning.
In the API Demo you can see this by clicking "Show Indeterminate", pressing back to dismiss the dialog, and clicking the button again. I've tried constructing my own progress dialog, however it shows the same problem, as the problem is with the "ProgressBar" spinning image.
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Aug 9, 2010
I have a card game I created in android and it is possible to show the scores at any given time by clicking a menu option. I would like that scores dialog to show a different background image when it's loaded depending on factors like who's leading, etc. In my constructor, I have the following relevant code:
public ScoresDialog(Context context) {
super(context);
this.setTitle(R.string.scoresDialogHeading);
setContentView(R.layout.scores_view);
...
}
I have tried getting that view to change it in the showDialog method i wrote like so: findViewById(R.layout.scores_view).setBackgroundColor(Color.BLUE); However, I got a NPE... I tried moving this statement to the onStart method, thinking that the view is not yet initialized but got the same error... Any thoughts on what the right way to do something like that is?
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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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Aug 9, 2010
I have a custom dialog box that asks for user input. Relevant code below:...............
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Jun 10, 2010
I am overriding the onCreateDialog and onPrepareDialog methods or the Dialog class. I have followed the example from Reto Meier's Professional Android Application Development book, Chapter 5 to pull some XML data and then use a dialog to display the info. I have basically followed it exactly but changed the variables to suit my own XML schema as follows:.................
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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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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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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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