Android :: Update View When AsyncTask Finished In Service
Oct 12, 2010
I have an activity which starts a service. In the service there is a network lookup in an AsyncTask. Results from the lookup are saved to a database.
The activity queries to database and shows the newest entries. But at the very first run the database is empty, so there is nothing to show. In this case I would like to show a progress dialog to the user while the network lookup is taking place. I would like to dismiss the progress dialog when the first lookup is finished.
Is there a way to access the progress dialog created in the activity from the service? Or how to do it?
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Jun 26, 2010
I have a service, that requests another class, which launches an AsyncTask
Service->Weather Class->Execute Method->Asynctask->Execute
this is launched in the service by
new Weather(this).execute(); // the execute is a method of the class, not of the AsyncTask
how do I detect in Service that the AsyncTask finished so I can call stopSelf?
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Jan 26, 2010
I am programming a game. I have a service for the background-music. When I press the home-button and leave my activities, the service still runs in background. How can I stop the service, when there is no more visible activity in my program and restart it, when the user goes back to my game (some activity of it)?
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Jun 30, 2010
I have an Android Service that is started by my application and does some things in a threadPool using Executors.newCachedThreadPool()
Once it has finished doing it's work I would like the service to stopSelf(), how can I get the service to determine when it is no longer needed (ie, there are no more Threads executing) so that it can shut itself down automatically?
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May 1, 2010
Everything is in the title.
On the official documentations it is stated that Note that services, like other application objects, run in the main thread of their hosting process and AsyncTask only works if it is executed in the UIThread.
So is it possible to use AsyncTask in a Service class? code...
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Aug 12, 2010
I have a Service that creates AsyncTasks for downloading files. In activities, we create Runnables or Threads that we pass to Activity.runOnUiThread(). I can't access that method from a service, so how do I use AsyncTask correctly, (do heavy work without blocking the UI Thread)?
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Apr 8, 2013
I need a endless loop/while/for.How to do this in a AsyncTask or Service?
[HIGH]public class Back extends AsyncTask<Void, Void, Void>{
@Override
protected Void doInBackground(Void... params) {
handler.postDelayed(new B1(), 2000);
handler.postDelayed(new B2(), 3000);
return null;
}
}[/HIGH]
I want to make my handler endless loop/while/for.
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Jun 1, 2010
I was wondering if it's possible to call specific methods defined within the AsynTask class from another class and/or service ?
In my specific case I have a Service playing some sounds, but the sound is selected from a List with available sounds...
When a sounds is selected it is downloaded from my home server, this takes some time (not much, let's say around the 3-4 seconds, the sounds/effects aren't big in size)...
So my problem at the moment is that I have a service to play those sounds, and when I select one I wanted to show a progressdialog... The way (if I understood correctly) is to use an AsyncTask, but the only thing the AsyncTask will do is telling my Service to play a specific sound from my server... So there is no "callback" from the service to the Asynctask...
How can I call a running AsyncTask, which sits in another class, and tell him all work is done and thus he can stop showing the ProgressDialog ? Or am I over-engineering it and there are other ways ?
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Nov 3, 2009
I've got a tab host activity started from a home screen shortcut. When my application starts it downloads information from a server using an AsyncTask. In the onPostExecute method of the AsyncTask I call setContentView to display the TabHost.When I start the homescreen shortcut by tapping on the shortcut using my finger everything works as expected, I download the information from the server and display the TabHost with the information in the tabs. However starting the application by navigating to the shortcut with the mouse wheel and then clicking on the shortcut with the mouse wheel leads to a trap in the framework code as soon as my application starts. This looks like a simple fix since mCurrentView is null at the time that this method is called - can this issue be addressed? Does anyone know of any workarounds?
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Jul 28, 2010
I'm trying to figure out the correct way to create an AsyncTask to retrieve some data from the internet and then to take that data and bundle it up in an Intent and pass it to a new activity(A list display). So in the first activity I just have an EditText and Button. In the event of an OnClick the task should be called and when it is finished the data should be bundled inside an Intent and passed to the next Activity. The problem is when I take the results from onPostExecute and set them to an instance variable of the main activity, that instance variable is still null when the task is complete. Here is the barebones version of the code:
CODE:...........
When I debug the application I see onPostExecute does contain a valid PlacesList full of results, so why is the instance variable places set to null after the task is executed? I am going about "returning data" from an AsyncTask incorrectly?
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May 4, 2009
If I have a View that I want updated at the same time another View updates itself. What is the correct way of doing this?
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May 13, 2009
I wrote a simple service, how can I get which view the service served?
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May 15, 2010
I have ListViewActivity
public class SelectActivity extends ListActivity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.select_one_of);
SimpleAdapter adapter = new SimpleAdapter(
this,
createChildList(),
R.layout.select_one_of_childrow,
new String[] { KEY_VALUE },
new int[] { R.id.selectoneof_add_new_item});
setListAdapter(adapter);
}
// ...
}
after setListAdapter() calls I would like to execute the following code:
((TextView) getListView().getChildAt(0).findViewById(R.id.selectoneof_add_new_item)).setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ticked, 0); but getListView().getChildAt(xxx) returns null and I catch NullPointerException. Where should I put mentioned above code-snippet?
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May 22, 2009
I want to show a view on calling a Service API. Currently the only way looks like using the Toast class.
I tried the following after getting the WindowManager service, but it crashes at addView. I looked into the Toast class and found that it uses WindowManagerImpl which is not accessible publicly - is there any way to access the WindowManagerImpl functionality?
CODE:.................
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Nov 18, 2010
I want to get the current focus view in my Service to check the view is a EditText and append some texts in it (for all EditTexts, not only in my application).
I found some methods to do this, like Activity.getCurrentFocus() and Windows.getCurrentFocus(). But these methods are used in a Activity.
How can I use these methods in a Service? Or is there another way to do?
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Jun 20, 2010
The Android market seems to move so fast. Just wondering, what is considered the 'best' and most 'finished' Android phone on the market right now? And, also what is the most promising device in the wings?
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Jul 1, 2010
Im trying to show a ProgressDialog while the activity is loading. my problem is that although i completed all the work in the activity. it takes a long time for the activity to load, i suspect this is because i use
multiple views with multiple listviews with custom array adapters inside a viewflipper. it takes a long time for the UI to show.how would i go about checking that all the UI inside the activity finished loading? or is there a way to preload all the activity and the UI?
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Oct 31, 2010
I'm writing a bitmap editor and I'm trying to write an autosave feature. When onPause is called, I write the application state to an autosave file. As this takes between 0.1s and 1.5s, I've been advised this IO operation be performed in a background thread.
In the onCreate method of my activity, I check to see if the autosave file exists and, if it does, I open it.
Are there any scenarios I have to consider where the user can somehow leave the activity, the autosave thread starts and the user can return to the activity before the thread has finished? If so, how can I detect this and wait for the thread to finish before I check the state of the autosave file?
I was going to make it that, when the user backs out of my activity, they're asked to wait a second while the data is saved. This seems OK, but I can't do this when my activity is interrupted by something like a phone call.
Also, I'm a bit confused about how multiple versions of the same activity can be started as this makes dealing with autosaving more complex. Is there a way to make sure only one instance of my activity is allowed to run at a time?
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Dec 7, 2009
I want to do something immediately after my application installed into the system. Is there such intent or hook to do this?
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Jun 8, 2010
So say you want to use your phone as a personal map, and you don't have service.This still possible. Seems to me that it would call and stream the available map.
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Sep 24, 2012
I have two list view which is display data from the web service.
List 1 -- with different background
List 2 -- with different background
I have two ArrayAdapter<String> to handle the values. I have issue in the display. my xml file is structured as
<Linear Layout>
<ListView> </ListView>
<ListView> </ListView>
<Linear Layout>
its displays the two list items by dividing the screen into two equal parts and scrolls within the list individually.
I wanted the List 1 to be displayed fully and then followed by List 2 and also it should screen should be scroll not with in the list but full screen so that List 2 could be seen below.
i tired many ways but still the results are not fine.
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May 25, 2010
I use my hands free headphones that come with the desire to recieve/make calls whilst I am cycling.The only problem is that once the call has finished the screen comes back on, even when it is in my pocket.Meaning I end up pressing buttons, changing music tracks, opening apps and making calls.My iPhone used to just stay in "power save mode" with the screen off once a call had finished.
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Dec 28, 2009
this is the current state/situation: I have an Activity which binds a Service which creates AsyncTasks which downloads various web resources. That works well, but of course the ProgressBar shows nothing. Previously i had an Activity which created an AsyncTask which downloaded some stuff. The AsyncTask got the View which holds the ProgressBar. So i could update the progress using onProgressUpdate and publishProgress. Obviously this doesn't work any longer because I have no reference to the ProgressBar.
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Mar 18, 2010
I am trying to create a simple Android application that has a ActivityList of information, when the application starts, I plan to start a Service that will be constantly calculating the data (it will be changing) and I want the ActivityList to be in sync with the data that the service is calculating for the life of the app. How can I set up my Activity to be listening to the Service? Is this the best way to approach this problem? For example, if you imagine a list of stock prices - the data would be being changed regularly and need to be in sync with the (in my case) Service that is calculating/fetching the data constantly.
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Jul 21, 2010
Koush just confirmed via Twitter recovery is done
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Jun 24, 2010
I bought a new sony ericsson x10 mini the other day and it is a fantastic phone. It is running in the Android system which is really good. The only thing that I can not figure our is that when I open up an application I don't know how to close them so I am left with multiples of Apps open at the same time. This seem to run the battery down really fast, but I can't seem to find any where or anybody that knows how to close the apps when I am finishes.
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Sep 1, 2010
died about 60% through. Now it won't charge on charger or computer but will stay powered up when plugged into either, sometimes. But only thing on the screen is Bootloader 30.1 in the top left. Code corrupt down the left a few lines below that, then below that it just flashes battery low cannot program. I try to power+camera+volume down and nothing i also try to home+power and nothing.
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Oct 8, 2010
I love using swype: quick and efficient. But in some programs I use (e.g. Tasker / Jotro) the swype keyboard pops up when I click a text field (as it should), but if I'm done, sometimes it shows a "done" button on the swype keyboard itself (and when I click on that, the swype keyboard dissappears), but sometimes, there isn't a done key on the keyboard (only an enter key which gives a new line in the text field I'm editing) and I can't scroll in the program to the save/done button in the program itself to save what I just typed. Does someone know whether there is a quick way to get rid of the Swype keyboard after I finished typing?
My (frustrating workaround) is to go to Swype options, press back, and the swype keyboard is gone.
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Aug 28, 2012
I am stage managing a show and have all of the sound cues on my Droid 4
The only problem is that I am using 'My Music' and when cue finishes (say a gunshot) the next begins (say a fog horn). This is very problematic
They all under the same album 'download'
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Sep 5, 2010
I have an app widget that uses a Service to handle updates (as per the SDK sample). If a task killer kills the service, the widget obviously stops updating. Is there any way I can notify the widget that the service has been killed so it can attempt to restart it?
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