Is it possible to get a progress dialog (a "loading..." one, not a percentual one) without using threads? I would even accept a custom dialog with an static image instead of the loading animation. So, is it possible? How?
Its not possible.
I would recomend using an AsyncTask which is what the Android Team made to simplify threading.
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How can I display a Progress at start up application in android
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I have a heavy user interface that can delay the application load. I want to show an preloader before the UI of activity loaded. note that my ui is in xml file
EDIT:
If you want to load 10 tabs in a view pager, use a FragmentStatePagerAdapter which only loads neighboring tabs(default behavior).
If the heavy UI you specify is only the UI elements, then the app must freeze while loading it. So you'd better show a non-cancelable dialog(without animation) with loading message and after a few moment (like 200ms) load up your UI and explicitly dismiss the dialog.
But if the heavy stuffs is not just UI, maybe some calculations or image processing, just do it in a background thread while showing a dialog with progress and cancel the dialog when the task is done.
#Hassan according to me if on clicking the launcher icon if it takes sometime for your application to render the first screen(perhaps giving a black screen in between). This needs to be corrected in your application.
On the contrary if your applications main screen requires population/retrieval of certain resources for effectively engaging the users, You can possibly do something like a splash screen(outdated) where you do all "population/retrieval" and then simply pass data to your heavy UI.
Now regarding the progress bar if this fetching of data is small, you can give an indeterminate "custom"(some moving animation that would suite your app) progress bar,else if its something like a download you can easily track its progress and show in a horizontal progressbar
You sure can! You are describing a preloader. Here is a nice example of one https://github.com/rtheunissen/md-preloader
You'll have to add more info to your question to get a specific answer, but there are a few basic principles.
You make your life a lot easier if you use a preloader which doesn't show progress of the load, it just goes round and round, because the speed of some load processes can't be measured.
If its a data-load which is taking the time (such as a call to an API), you might want to set a variable for "loading" to true at the top of your script, then when the data has resolved, set it to "false". In your view, have a state or a conditional element which hides / unhides the preloader.
If lots of images are slowing down the page, you might want to look into "lazy-loading" or using "infinite scroll" to only show content when the UI needs to display it on screen.
Thats all the info I can give without more information on the code you have so far. Hope that helps!
Currently, I am using Libgdx for making app with lots of animation. I am trying to use android Dialog for showing paragraph with html tags through Interface. While, I can change dim color of background UI back to normal with following code.
paragraphDialog.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);
Is there anything I can do to make background UI work? (Button click, textview focus etc)
And, I have tried GlyphLayout of Libgdx for paragraph. It frequently crashes & also doesn't support html tags. I am using dialogs, as it is pretty easy to use xml layout easily with dialogs. If there are any other options, Please suggest.
Thanks,
your dialog is blocking the entire screen, doesn't matter if the edges/background are somewhat transparent or not 100% alpha, it is still the view that is currently on top. therefor, you can't click on it directly.
i think the best way to achieve your goal is with a fragment. not a dialog.
I am building an android app which will download some data and display it to the user. Now I need to show a circular progress bar until the data is downloaded. The download will begin on a button click. How can I achieve this? Sample code would be very helpful.
You need to use an AsyncTask to execute your download and ProgressBar instance to show a circular progress.
There are many resources you can find which describe exactly how to use the combination to do what you want.
Check Android AsyncTask class for what you want to achieve.
Basically you start showing a ProgressDialog in the onPreExecute of AsyncTask and dismiss it in onPostExecute when your background job is done.
Check these also.
android how to work with asynctasks progressdialog
http://twigstechtips.blogspot.com/2011/11/for-my-app-moustachify-everything-i-was.html
http://javatech.org/2011/02/discovering-android-opening-a-progress-dialog-with-asynctask/
I have a program that copies a file to the sd card. The program takes a while to run, and now it just freezes while the file is being copied.
I saw some other programs that have a animation of a wheel spinning in the center of the screen while the file is being down loaed.
I tried to google spin control, but this brought up animation about a selector control using spinning wheels.
Is this feature built into the android?
Use a ProgressBar widget with indeterminate="true". You can use a ProgressDialog, read http://developer.android.com/guide/topics/ui/dialogs.html
Also, learn about threads, as you should be doing your file save in a background thread. http://developer.android.com/guide/components/processes-and-threads.html
You should use an AsyncTask to download the file. This will prevent your UI from freezing, and also easily allows you to show progress information if you want. If you want to let it download in the background, and let the user continue using the app, that's doable as well.
You can find an AsyncTask in one of my open source projects that downloads a file and shows the progress information using a progress bar here. You can change the style of the progress dialog to suit your needs.
I'm assuming you're using some sort of AsyncTask to download it?
If this is the case you can make an indeterminate progress bar start spinning right before you call task.execute() and then in onPostExecute() you can set the progress bar's visibility to view.GONE
here is an example on progress bars: http://codehenge.net/blog/2011/06/android-development-tutorial-progressbar-example/
I parse the .html page and take set of checkbox, than I add checkboxes to layout and setContentView(layout). But parsing is slow, and I want to create loading window during data is loading. I don't know how to do it, help me please. Thank you for, anyway.
For that you can implement AsyncTask (Painless Threading), implement ProgressBar inside the onPreExecute() method of AsyncTask.
As i have marked it is known as Painless Threading as we developer need not to bother about to start/pause/stop the thread, it is managed by Android itself.
Update:
You can also show ProgressDialog inside the onPreExecute() method and then hide the same in onPostExecute() method. For the same, i suggest you to go through this article, really helpful: https://sites.google.com/site/androidhowto/how-to-1/asynctasks-with-progressdialogs
You can do this using a progress dialog. There is a tutorial on the Android Developers Website, and this is where It starts to explain:
A ProgressDialog is an extension of the AlertDialog class that can
display a progress animation in the form of a spinning wheel, for a
task with progress that's undefined, or a progress bar, for a task
that has a defined progression. The dialog can also provide buttons,
such as one to cancel a download.
The Link is here: http://developer.android.com/guide/topics/ui/dialogs.html