Android :: AsyncTask To Run On Activity Start Fails After Previously Getting Cancelled
Sep 10, 2010
I am using an AsyncTask to fetch the ring tone for a contact when my application starts, it works fine until after my Activity closes a couple of times during the AsyncTask, after this happens the AsyncTask will only ever get to onPreExecute() and never doInBackground, so I can never fetch the ringtone then until either a force stop or device restart.
Why this might be happening? Why the AsyncTask would get to onPreExecute but then never run doInBackground()?
Here is my code: (Following the Shelves source code)
CODE:.....................
And onAddRingtone() is used in onCreate and onCancelRingTone() is used in onDestroy() as well as where you can see if in the code above. I have spent 3 days on this and I haven't been able to find a solution? Am I taking the wrong approach? Using cancel wrong? Is there a bug?
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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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Oct 12, 2009
I have an activity that starts with an AsyncTask to check the connection to my servers api.
Since this should not run in the UI thread i have made a AsyncTask for this.
The problem is that is get an runtime exception when i start the background process of the Asynctask.
How can i avoid this?
From log:
code:.........................
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Sep 12, 2010
I use an AlarmManager to run a Service which tries to download a file from the web. If it fails I'd like to retry that Service in 5 minutes.
Inside the Service I run an AsyncTask to run my code. As far as I know the only way I can tell if it failed or not is from the onPostExecute().
What is the best way of implementing a retry of that Service again?
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Feb 19, 2010
Is there anyway to go back to a previously launched Activity while running an Instrumentation test? Currently, when I use sendKeyDownUpSync( KeyEvent.KEYCODE_BACK);, this forces my test to exit, rather than go back to the previous Activity.
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Jun 13, 2010
In my TabActivity the user may be asked to switch to browser activity for OAuth phase, and if the phase takes too much time, my activity will be killed. After the user switches back to my activity, its onCreate() method is invoked again and tabs are recreated.
So I would like to know if there is any simple way to switch back to previous tab, and keep the tab as what it was. For example, one of the tab views contains a ViewSwitcher child, and I want to switch back to the switched view after recreating the activity.
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Nov 14, 2010
Java/android how to start an AsyncTask after 3 seconds of delay? how i can do that?
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Apr 3, 2009
Tried to trace for the first time but got the following exception when I started the "traceview" application with my trace file. mane@Labbe:/tmp$ traceview gldraw.trace Exception in thread "main" java.lang.RuntimeException: Method exit (java/lang/BootClassLoader.getInstance ()Ljava/lang/BootClassLoader;) does not match currentmethod (dalvik/system/VMDebug.startClassPrep () V) at com.android.traceview.ThreadData.exit(ThreadData.java:116) at com.android.traceview.ThreadData.handleCall(ThreadData.java: 78).....
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Jul 23, 2010
Windows 7 x64
Eclipse Helios x64
JDK x64
Android SDK r06
When I try to start an emulator from Eclipse (Android SDK setup application) with the scale parameter it just fails. Second Command Prompt screen (which I think is actually a Java app) shows some exception but it closes itself right after. This is very annoying because without the scale, WVGA emulator does not fit on my laptop's screen. Any idea how to fix this? And when I try to start an emulator from Command Prompt with the scale, it works.
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Aug 9, 2010
I know this is not how an async task should behave but my question is how to "block" the user while executing it.My need is the following: I have my own backup/restore process and I have an async task to run these two actions. The backup is fine, I can warn the user when the backup is done and that's just fine But my problem is about the restore process. When the user click on restore he shouldn't be able to make any change in the application (and anyway don't want to because he would lose all his changes).I understand that having the user blocked while restoring (or maybe with a progress bar) is not a best pratice but I do not see any other possibility in this context.
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Feb 18, 2010
private class ExecuteLocations extends AsyncTask<String, Void, Void>{
private final ProgressDialog dialog = new ProgressDialog(ListProfiles.this);
protected void onPreExecute() {
//this.dialog.setMessage("Starting pre-execute...");
//this.dialog.show();
} @Override protected Void doInBackground(String... arg0) {
check_profiles_lm=(LocationManager) ListProfiles.this.getSystemService(LOCATION_SERVICE);
myLocListen = new LocationListener(){
@Override public void onLocationChanged(Location location) { HashMap params = new HashMap();
params.put("lat", Double.toString(location.getLatitude()));
params.put("long", Double.toString(location.getLongitude()));
postData("http://mydomain.com",params);
} @Override public void onStatusChanged(String provider, int status,Bundle extras) {
} @Override public void onProviderDisabled(String provider) {
} @Override public void onProviderEnabled(String provider) {
} };
check_profiles_lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 30000, 0, myLocListen);
return null; } protected void onPostExecute(final Void unused) {
if (this.dialog.isShowing()) { //this.dialog.dismiss();
} //Do something else here
} }
Basically, my objective is:
Constantly post the latitude/longitude to my website every minute or so. Of course, I want to do this in another thread, so it doesn't mess up my UI thread. This AsyncTask is supposed to solve that but it's bringing up an error and I don't know why. What can you do to accomplish my objective? It's very simple...just scan location and post to web every minute, in the background. By the way, my onCreate method is like this. That's basically it.
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
new ExecuteLocations().execute();
setContentView(R.layout.main_list);
}
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Mar 27, 2010
I have an AsyncTask object which starts executing when the activity is created and does stuff in the background (downloads upto 100 images). Everything works fine but there is this peculiar behavior which i'm not able to understand.For eg: when the android screen's orientation changes then the activity is destroyed and created again. So I override the onRetainNonConfigurationInstance() method and save all the downloaded data executed in the AsyncTask. My purpose of doing this is to not have AsyncTask run each time activity is destroyed-created during orientation changes, but as i can see in my logs the previous AsynTask is still executing. (The data is saved correctly though)I even tried to cancel the AsynTask in the onDestroy() method of the activity but the logs still show AsynTask as running.This is really strange behavior and would really be thankful if someone can tell me the correct procedure to stop/cancel the AsynTask.
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Apr 28, 2010
What happens on Activity.finish() with an AsyncTask still running in background?
Does it just pop the Activity off the Activity Stack, but wait to destroy the Activity object until the AsyncTask fully completes (since the AsyncTask is an inner class of my Activity)?
Also, would it act any differently if the AsyncTask were a public, non-inner class that held no references to the instance of the Activity?
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Jul 24, 2010
I have an AsyncTask that scans the file system and publishes progress through Notifications. To do this I need a reference to the current Activity in the AsyncTask.
I also don't want to kill the task when the activity is destroyed. How do I avoid leaking the activity and everything it references on each configuration change?
One possibility is to remove the reference in OnPause() to be sure it is gone when the Activity is destroyed, but that would mean notifications stops coming as soon as you leave the activity which is no good.
Isn't there a recommended way of dealing with AsyncTasks in this way?
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Jan 19, 2010
My code is calling setContentView(R.layout.someLayoutID); from an activities' onCreate method. The activity is launched with the following: Code...
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Apr 12, 2010
What i'm trying to do is to open an Activity when i click on a button.
This is my code in my main activity.
CODE:...........
The program launches no problem when i just implement the first button (restuarant).
But when i try to implement the button that i have commented out it fails to launch. and yes i have added the activity to the manifest file.
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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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Jan 26, 2009
I have an application with contains multiple activities. The main activity will start the others ( use startActivity() ) depends on user event, when an activity close, it calls finish() and return back to main activity. It appears to behavior like that.
However, the "problem" I see is main activity's onCreate function is called every time. I think the the main activity should be placed in the activity stack and simply push to front when others exit, therefore only onResume, onStart are called. Is there some flag I need to set or I misunderstand the activity behaviro?
In child activity, besides calling finish() or startActivity for main activity, what is other way to move main activity to front?
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Jan 10, 2010
I created an application which enables the user to set whether he wants to receive notification while the application runs in background mode. If the notifications are enabled an activity should be started (the dialog should appear on the screen).
I tried to enabled it the following way:
CODE:...........
This is the method from main activity. When onPause() is executed isRunningInBackground is set true.
When I tried to debug it when the main application was running in the background the line
startActivity(intent) had no effect (the activity didn't appear).
Does anyone know how to midify the logic in order to start an activity from the main activity when the main activity is running in the background (after onPause() is called)?
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Apr 20, 2010
I have tried to write an Android application with an activity that should be launched from a different application. It is not a content provider, just an app with a gui that should not be listed among the installed applications. I have tried the code examples here and it seems to be quite easy to launch existing providers and so on, but I fail to figure out how to just write a "hidden" app and launch it from a different one.
The basic use case is:
App A is a normal apk launchable from the application list.
App B is a different apk with known package and activity names, but is is not visible or launchable from the application list.
App A launches app B using the package and class names (or perhaps a URI constructed from these?).
I fail in the third step. Is it possible to do this?
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Sep 10, 2010
I need to made an activity (without layout) that on start check if a service is running. if it is true it starts Activity2, if it false it starts Activity1.
I tried with this code:
CODE:............
Enter code here
But when I check, in the onCreate method, if serviceConnect!=null I receive sometime a NullPointerExcption.
I tried also to insert the operation in the method onCreate in an Async Task:
CODE:............
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Apr 22, 2010
I have a huge maze of activities in my application. What I need to do, is that when the user logs in into the system, the activity history should be cleared. I cant just use finish() when I start a new activity, because I want the activities to have a history until the user logs in. I have experimentet with the different flags when starting an activity, but I have had no success.
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Apr 11, 2010
I have a widget that supposed to call an Activity of the main app when the user clicks on widget body. My setup works for a single widget instance but for a second instance of the same widget the PendingIntent gets reused and as result the vital information that I'm sending as extra gets overwritten for the 1st instance. So I figured that I should pass widget ID as Intent data however as soon as I add Intent#setData I would see in the log that 2 separate Intents are appropriately fired but the Activity fails to pick it up so basically Activity will not come up and nothing happens (no error or warning ether)
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Nov 19, 2010
I want to start a new activity from ab activity that (extends from Linearlayout) .. but this code is not right
CODE:..........
public class SearchResultForm extends LinearLayout{ ...
And i get this error ..
No enclosing instance of the type SearchResultForm is accessible in scope.
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Aug 19, 2009
An activity can be called from existing activity through *startActivity(intent); *
Is t possible to call an activity from non Activity class ? and how?
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Apr 8, 2010
I am developing an aplication. This one is designed to login a user, then select how find a place, using simple data or using a map. When I try to set in the event OnClick for select the "Map way" (using intent):
startActivity(new Intent(getApplicationContext(), MapviewController.class));
I have problems and didn't work.
My class and manifest are:
CODE:...........
Do you know any way to call the MapActivity from other?
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May 15, 2010
Can some one tell me ,why launch is canceled ? [2010-05-15 07:56:22 - Helloandroid] Device API version is 7 (Android 2.1) [2010-05-15 07:56:22 - Helloandroid] HOME is up on device 'emulator-5554' [2010-05-15 07:56:22 - Helloandroid] Uploading Helloandroid.apk onto device 'emulator-5554' [2010-05-15 07:56:28 - Helloandroid] Failed to upload Helloandroid.apk on device 'emulator-5554' [2010-05-15 07:56:28 - Helloandroid] java.io.IOException: Unable to upload file: timeout [2010-05-15 07:56:28 - Helloandroid] Launch canceled! You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscribe@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
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Jan 5, 2010
I am working on a travelling application and i am using tabs and each tab has an activity i.e world clock in one tab ,weather data in another tab and so on with in the weather tab i am displaying the users selected cities and the scenario is that when the user selects a city that city's forecast is to be displayed and later to view details as well which is in another activity . how can i launch this new activity from the already started activity with in the same tab ?
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Sep 13, 2010
I'm trying to start an Activity with startActivityForResult, but I keep getting an ActivityNotFound exception, and I can't work out why. I've looked through the code multiple times, and it seems to be identical to some other, working code. Any suggestions?
The newNoteButton that starts the Activity:
CODE:...........
And the beginning of the TypyEdit Activity:
CODE:................
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Sep 15, 2010
I have created two classes: Example1 and Example2, which extends activity.
Example1 contains a UI of buttons, while Example2 contains UI of TextEdit.
I want to call Example2 when a button is clicked, so this code is in an onclick method
Intent i = new Intent();
i.setClassName("com.a.ui", "com.a.ui.Example2");
startActivity(i);
So I am able to get the UI of Example2 successfully.
What's an alternate way of calling intent?
Is there any alternate way to start an activity?
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