Android :: Activity.finish() With AsyncTask Still Running In Background?

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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Android :: Problem Long Running AsyncTask With Reference To Activity

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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Android :: Start Activity When Main Activity Is Running In Background

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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Android :: Instance Variable Of Activity Not Being Set OnPostExecute Of AsyncTask - Return Data From AsyncTask

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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Android :: Activity Finish Method Waits To Finish?

Aug 14, 2010

With this sample code, the activity is told to finish, but continues execution afterwards and displays the message. I'm trying to understand why this happens. The only fix I can think of is to place 'return' after finish.

public void someMethod() {
if( valueIsTrue) {
startActivity(new Intent(this, NewActivity.class));
CurrentActitivy.this.finish();

// return; // if uncommented, Toast doesn't show
}
Toast.maketext(this, "Some message", Toast.LENGTH_SHORT).show();}

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Android :: Start Activity From Service - Running In Background

Nov 13, 2009

I want to develop a application that continuously running in background as service. And after that if i press any numeric key, it should start an application.

I have developed a service which is running continuously. Is it possible in Android?

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Android :: Pop Up Dialog Or Activity From Service Running In Background When Keyguard Locked?

Nov 19, 2010

I have an application in which there will be a service continuously running in background and on certain conditions service should call an activity or pop-up a dialog. I think this is possible. The question is, in case device keyguard gets on say after 2 minutes of idle time then will the service continue running in background. And what will happen when the condition of opening pop-up or Activity is reached.

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Android :: Finish Any Previous Activity In Stack From Current Activity?

Apr 27, 2010

How to finish any previous activity in application stack (at any level , I mean not immediate parent) , from current activity like on some particular event I want to invalidate this previous activity?

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Android :: Finish Activity Not Started From Current Activity

May 1, 2010

I have following problem with my application: From my main activity ("activity 1"), there is a menu from which user can launch an action. This action will result in an Intent being received by a BroadcastReceiver, defined in my application. Finally, this BroadcastReceiver will start an activity ("activity 2") to deal with this intent.

The problem is that I have a "quit application" entry in my menu, and I can only finish() currently active activity. ie I am not able to finish "activity 1" from the menu of "activity 2". And I can't use startActivityForResult() as "activity 2" can't be started from "activity 1". Any suggestion would be much appreciated Thank you very much guys, regards.

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Android :: AsyncTask Run Progress Background

Apr 11, 2010

I don't understand why I'm getting this error. I'm using AsyncTask to run some processes in the background. I have:
protected void onPreExecute()
{
connectionProgressDialog = new ProgressDialog(SetPreference.this);
connectionProgressDialog.setCancelable(true);
connectionProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
connectionProgressDialog.setMessage("Connecting to site...");
connectionProgressDialog.show();
downloadSpinnerProgressDialog = new ProgressDialog(SetPreference.this);
downloadSpinnerProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
downloadSpinnerProgressDialog.setMessage("Downloading wallpaper...");....

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Android :: Use AsyncTask To Show ProgressDialog While Doing Background Work

Oct 8, 2010

I am developing my first Android App and I need a ProgressDialog to be showed while a background task, in this case just a http call on the server, happens.

I did a bit of studying on this and also have already checked other threads related to this subject.

http://developer.android.com/reference/android/os/AsyncTask.html

[url]

[url]

[url]

Among others.

Than I got to write a bit of code:

1) In My Activity I declare a variable to be of type ProgressDialog

code:............

2) I have also written an inner class to extend AsyncTask as required, here in the doInBackGround is where I call a static method which actually do the POST http request to the server, in the server side I have blocked the server response 20s to validate the progress dialog.

code:............

3) When the button is pressed I than build the ProgressDialog anc call the AsyncTask I have created:

code:...................

Well, this is it, I believe this was suppose to show a progress dialog while the AsyncTask would query the server in background, but what I get is NO progress bar until server response arrives and than for a fraction of time(less than 1 second) the progress shows and the next Activity is called.

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Android :: Restart An AsyncTask Or Avoid If RUNNING?

Sep 24, 2010

I am Developing an App that parses data from HTML. One of the data that is parsed is an integer that increases over time and rather than constantly requesting the data I would like to have a task that intervals the integer. Due to the fact that I need the value updated into a TextView I decided to go with an AsyncTask rather than a Timer.

My issue is I want to be able to restart my task once I know that it has finished, or if it is currently RUNNING simply avoid manipulating it.

Here is my AsyncTask:

CODE:.......

My attempt to start or avoid:

CODE:................

Am I going about this correctly?

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Android :: How To Intent A Dialog When The Thread.run() Finish Running

Aug 11, 2010

I'm develop a download manager function which the dialog will popup when the the item was finished download. the download function was running at background.

My question is how can I know when the downloading was finished and the project is intent other activity?

For example:

CODE:............

The above method where should I put? i try put it at onResume(), onStart() in every activity which will open by user. but unlucky it won't work.

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Android :: Finish Activity From Other Activity

Oct 8, 2010

I am having application in which i am using menu , on tap on menu item i am redirecting to specified activity. I want to make sure that when i am redirected to another menu item my current all activity should be finished to reduce the stackflow of the activity and better performance. So when i tap on back from my tapped activity from the selected menu activity i should be redirected to another activity and finish current activity. So i am wondering is there any way by which i can finish another activity from my current activity. Or should i override the OnKeyDown Method..

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Android :: How To Make Service Running When Phone Finish Booting?

Jan 18, 2010

Can anybody tell about the Broadcast Receiver in android to make make my service to run when the the phone just finishes the booting.

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Sprint HTC Hero : Running Apps After Exitting It - Still Running In Background

Oct 19, 2009

I noticed that if i dont use the app to kill running apps after i exit them they are still running in the background is this normal for the Android? I am coming from Pre so not sure if they are killed when exited.

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Android :: AsyncTask And UI Activity

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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Android :: How Finish An Activity In This Instance

Aug 16, 2010

We all know that hitting the back button on the device doesn't kill the application, it merely finishes (destroys) the activity running on the foreground.

Well I have come across some code which helps me capture the back button signal so that I cannot exit the application. The only way to exit it in such cases is to press the home key.

Now this situation presents me with a unique disadvantage! The inability to kill finish the application on a time of my own choosing allows the application to keep running in the background like nothing has changed.

So in such cases is the task manager my only friend or is there a way for me to otherwise kill this application?

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Android :: Activity Pause Rather Than Finish?

Nov 30, 2009

I see no means by which my activity can pop itself off the activity stack to return the user to the one he was using before it was invoked. Is there one? My purpose is that my app has some data structures built from data provider queries that take 5-15 seconds to assemble and I don't want a lot of latency if it is used in a few one-shot purposes in rapid succession. I'm more than willing to let the system ask my app to die, but I'd like to keep warmed and ready otherwise.

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Android :: Wait For Activity To Finish?

Sep 7, 2010

I have one activity call a camera view activity, and in the onActivityResult, I have it start that activity again with different parameters. Android doesn't seem to like that, and gives me an error that the camera is not available if I start it right after it returns. I tried just waiting a few seconds, but this doesn't seem to work on all phones, and it sometimes crashes. Is there some way to wait until that activity finishes properly, and gives up all resources?

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Android :: Finish Not Killing Activity

Apr 12, 2009

I've got an application that has (among other things) three Activities, let's call them A, B, and C. A is the main navigation point for the entire application, and launches B and C directly using startActivity(). They work fine that way. However, when I call C from inside B, I get a strange problem. The code for launching Activity C is exactly the same in both places. The problem is the hardware back button. In the emulator, it takes two presses of the back button in order to close Activity C and come back to B. On a G1, it takes 3 or 4 presses. Upon seeing this, I implemented the usual suspects in C - onPause(), onStop(), and onDestroy(), and onResume() in B. When I press the back button from C and it doesn't work, I get onPause(), onStop(), onDestroy () - in that order, but nothing happens. When it works (on press 3 or 4 on the G1), I get onPause(), then onResume() in B, then onStop() and onDestroy().

I've tried catching the key press of the back button and calling finish (), but that doesn't make a difference. Has anyone seen this? To pre-empt some questions: All C does is display some data. There are no threads or any other special resources that C might have an active handle to that's preventing it from closing. But out of curiosity, if it did, how would I detect that? Any ideas for further diagnostics here?

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Android :: Finish() Won't Close Activity

Jul 23, 2009

I have an EditText field and I want to pop up a new window/activity whenever a user touches/clicks the field. The new window has some widgets and of course Apply and Cancel buttons. Here is the code how I intercept the onTouch event.

EditText ctlMaskEt = (EditText)findViewById(R.id.mask_field); ctlMaskEt.setOnTouchListener(new OnTouchListener() { public boolean onTouch (View v, MotionEvent event) { popMaskEditor(); return true; } });

Everythings work fine until I click the Apply and Cancel buttons. The API finish() won't close the new window unless I click the same button one more time. Calling popMaskEditor() from a button's OnClick event handler doesn't have this problem.

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Android :: List Of Running Process Running In The Background

Aug 19, 2009

I am trying to get the list of process running in the background.

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Android :: Finish Activity Doesn't Work

Nov 5, 2009

In main Activity, I called start Activity For Result(intentB, 100) to start a new activity B, then in B, I called startActivity(intentC) to start another activity C. Lastly I wanted to call finish Activity(100) in C to close activity B, but seemed it was not successfully destroyed(I can use BACK key to see it's still there.)

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Android :: Finish Activity When Home Pressed?

Mar 25, 2010

I saw another thread related to this question, but did not find the answer that was useful to me. Is it possible when the user presses the Home button to be able to finish() my activity somewhere? I saw that people were having problems with using onStop(). Has anyone found a resolution to see if this is always called on Home being pressed?

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Android :: Finish Child Activity From Another In Droid?

Sep 14, 2010

I have a parent activity (as ACTIVITY GROUP) and some child activity of this parent activity (as ACTIVITY).
I am just calling child1 now i want to move from child1 to child2 and just want to finish() child1.
But when i am calling finish() it is also finishing the parent activity.

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Android :: Does Pressing Back Always Cause Activity To Finish()?

May 10, 2010

I've heard that pressing the back button will essentially cause the current Activity to finish(). Is this always the case? Seems like it would be with the way it pops the Activity off the stack.

The one situation I'm not so sure about is when the root Activity in a Task has back pressed. I'm currently experiencing a very weird effect, described as follows:

On loading my application, the first Activity is for initialization, and once it finishes, it calls my main Activity (a TabActivity). This first init activity has android:noHistory="true" set in the Manifest so pressing Back from my main Activity won't go back to that. It goes to the Launcher. When I click on my App in the Launcher a second time, the initialization activity loads again, and loads the main Activity when done. Almost immediately after, it loads a second instance of my main Activity. But ONLY after the Application has already been run once, and was exited by pressing BACK from the main Activity. It does it every subsequent time until I force quit the app or load a new version from the IDE.

Based on this, I am suspecting some kind of Activity instance is lying around and being reused, since it only happens on the second+ time I run the application (and exit with BACK -- using HOME just returns to the last state of the app, no big deal).

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Android :: Finish Activity From Custom BaseAdapter

Nov 22, 2010

In my android application I have custom listview with an image and textview. In extended BaseAdapter under getView method click events of textview and image are associated with onClick method using setOnClickListener as shown in code below

CODE:.............

And

CODE:...................

When clicking on image it acutally deletes that entry from List which works fine, but on clicking textview i would like to return the text of clicked textview to main activity but I am unable to achieve this, although I can do this from setOnItemClickListener of this custom listview acitivity.

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Android :: Finish Parent Activity From Child?

Mar 30, 2010

My child activity X is called from Parent activity P through startActivity(intent). I want to close P when X called its finish() method. I override a method finishFromChild(Activity child) in P and called finish() in it. But this functions (finishFromChild(Activity child)) is not being called after X finish() Is it a known bug or I am missing some thing? I googled and also searched the groups but no help.

An alternative could be... using StartActivityForResult() and a "fake" onActivityResult, where I can finish the parent activity, but this way is quite bad, i think...

I prefer the first one, if it would work....

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Android :: Calling Finish() After Starting A New Activity

Apr 26, 2010

The first Activity that loads in my application is an initialization activity, and once complete it loads a new Activity. I want to ensure if the user presses 'Back' they go straight to the Launcher, and not the initialization screen. Side note, is this even the best approach, or would this be better done with some kind of Intent Flag?

Is it correct to call finish() after calling startActivity() on the new activity?

CODE:...................

I'm still taking in the whole 'Message Queue' method of doing things in Android, and my assumption is that calling startActivity() and then finish() from my first Activity's onCreate() will log each respective message in the message queue, but finish execution of onCreate() before moving on to starting the next Activity and finishing my first one. Is this a correct understanding?

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Android :: Why Restarting Activity When Call Finish()

Sep 10, 2010

I have an activity that after some user interaction calls finish() on itself. From time to time it gets into a loop where when it calls finish() it finishes but immediately restarts again. Any idea why android tries to restart my activity?

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Android :: Finish An Activity Not Started From Service

Jun 17, 2010

I've a service which listens to user request for ending one activity and starting another activity. For Ex: Say there are activities1,2 ,& 3. Now if there is already activity1 started by someother activity then based on the user request i need to stop activity1 and start activity2 or activity3. If the acitivity1 is started by my service then i can do finishactivity(requestcode) and shall receive a call to onActivityResult() then i can start next activity 2 or 3. But can i stop the activity1 which is started by some other activity from a service?

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Android : Activity Finish - X System Exit

Jan 21, 2010

I've been using System.exit to quit the application. Is Activity.finish a better approach? What would be the differences?

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Android : How Activity.finish() / StartActivityForResult() Collaborate With Each Other

Nov 12, 2010

I got a question about Activity.finish(). In my Android code, there are 4 activities(A,B,C,D). The starting activity A calls startActivityForResult(intent, reqCode) to start activity B. B starts C, and then finish(), not waiting for result. C does exactly the same as B, starts D and then finish(). D will return some result, by setResult(resultCode).

When my code runs and activity D returns some result, A will catch a RESULT_CANCELED on onActivityResult(), even if RESULT_OK is returned in D. I guess the RESULT_CANCELED is from activity B, which has been terminated before D returns a result, rather than from D.

But, my question is, why activity A catch RESULT_CANCELED after D returns some result, rather than immediately after B is terminated? And, what should I do to make A catch results from D? Do I have to keep B and C alive, to pass results from D to A?

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Android :: Executed ASyncTask In Activity But Not Working

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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Android :: AsyncTask Won't Stop Even When Activity Has Destroyed

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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Android :: 1.5 And 1.6 After Calling Finish Activity And Home Button

Jan 12, 2010

I open splash screen at the end i call finish() then i moved to browse page. At the browse page when i click on home button it hide the application.(b/c of Android's Multi tasking feature) When i go to Android's desktop launch application again it starts from splash screen. Android Platform 1.6

I open splash screen at the end i call finish() then i moved to browse page. At the browse page when i click on home button it hide the application.(b/c of Android's Multi tasking feature) When i go to Android's desktop launch application again it always starts from browse screen instead of splash screen why is that..............

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Android :: How To Finish Series Of Open Sub-activities From One Activity

Apr 8, 2010

I am trying to make an exit button for my application. Anyhow I am able to track all the instance of activity in my application and then finish them all. But still some activity remain alive in some cases. Dont know how. Is there any method to kill a particular application in android. Or any other way can I exit from my application.

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Android :: OnPause() Not Being Called For SingleTask Finish()'d Activity?

Feb 17, 2010

I'm not sure why onPause() is not called in the following scenario.

Here's my activity:

CODE:.......................

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Android :: When Does Activity Object Really Get Killed After Calling Finish()

Nov 5, 2010

I created a thread in my activity, and that thread will print out the value of my instance variables in my activity after running for about 10 seconds. I pressed the back key to destroy my activity before the thread prints out the values, and when the thread reaches that line of code, it can still print out the values correctly. That means even though the activity is finished, the java object of the activity is still there. Will the object always be there? Or it is just waiting to be GCed? Or it will be killed only when Android needs memory?

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Android : How To Finish Old Activity / Start A New One / Vice Versa?

Nov 15, 2010

I know, that I get the same result with both code snippets

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Android :: How To Override The Back Button So It Doesn't Finish() My Activity

Jun 29, 2010

I currently have an Activity that when it gets displayed a Notification will also get displayed in the Notification bar.

This is so that when the User presses home and the Activity gets pushed to the background they can get back to the Activity via the Notification.

The problem arises when a User presses the back button, my Activity gets destroyed but the Notification remains as I want the user to be able to press back but still be able to get to the Activity via the Notification. But when a USER tries this I get Null Pointers as its trying to start a new activity rather than bringing back the old one.

So essentially I want the Back button to act the exact same as the Home button and here is how I have tried so far:

CODE:.........

However the above code still seems to allow my Activity to be destroyed, How can I stop my Activity from being destroyed when the back button is pressed?

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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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Android :: Return To Previous Activity Without Calling Finish() / Save This Information?

Oct 26, 2009

I have an android application with a LOT of activities, think of something like a book where every page is a new activity. The user can make changes in each activity, for example highlight certain texts with different colored markers etc. and it's crucial that I'll remember this information as long as the application stays alive (and I don't want/need to remember any of this when it's not). As I understand the best mechanism for storing this kind of information is via onSaveInstanceState(Bundle outState) and onCreate(Bundle)/onRestoreInstanceState(Bundle) rather than lets say, the Preferences mechanism. My only problem is that the user can navigate backwards to previous pages (Activities) and the only way i know of achieving this is by calling finish() which of course kills the current activity without calling onSaveInstanceState(Bundle outState) and even if it did call it, the next time I would launch an activity representing that page it would be an entirely new instance. So my question is: Is there a way to go back to the previous activity without calling finish()? or, is there a better way to save this information? maybe through static variables?

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Android :: Trap In TabHost When AsyncTask Delays Set Content View At Activity Startup

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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