Android :: How Do I Return To Calling Activity If User Presses Back?
Aug 4, 2010
My MAIN activity is spawning a child activity that contains a ListView. While this ListView is being populated (through an AsyncTask), an indeterminate progress bar is shown.However, assuming that I am an impatient user and I press the BACK button, the progress bar is cancelled but I am left with a blank screen. I have to press BACK one more time to go back to the MAIN activity.I would like the app to go back directly to the MAIN activity by pressing BACK only once. Can somebody point me in the right direction? I am thinking I should call finish() somewhere but I don't know where to put it.
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Sep 27, 2009
When I currently have my activity on the font of the screen, how can I make Android to 'destory' my activity when user clicks 'back' button? (i.e. onDestory of my Activity gets called)?
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Oct 6, 2010
First of all, maybe i went about this the wrong way in the first place. Situation is, i have a listview that when an item is clicked, it creates an intent and calls startActivityForResult() to another activity, to be able to edit the entries in the row. and that other activity after editing the required values, returns back to the calling activity, when the user clicks on a save button. The activity then uses the row Id to update the item.My problem now is that, if the user presses the BACK button instead, the application crashes. i have been looking around and see solutions like using Shared Preferences or onSavedInstanceState(), but i don't know where exactly i should be putting the code?
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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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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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Nov 11, 2010
I am new in Android. I encounter the following situation, I have a background running service, which will get a keep-updating string from a webpage, I need to show this keep-updating string in my UI through Activity, since this string is get from service, I am wondering, How can the service pass the string to Activity so that activity can render the string on UI.
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Jun 14, 2010
My application supports twitter and needs to open browser for OAuth. When the user clicks the Share on Twitter button, the main activity will create another subactivity (TwitterActivity) to handle twitter authentication issues. Here is a flow graph showing how activities are invoked currently. Main is short for MainActivity and Twit for Twitter Activity. startActivity() OAuth intent OAuth callback finish()Main ---------------> Twit ------------> Browser --------------> Twit --------> Browser As you may notice, after the TwitterActivity calls finish() to stop, it will now return back to MainActivity, but Browser instead. How can I make it return back to MainActivity?
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Jun 29, 2010
Is there a way that a Service can report back to the calling activity when the Service has reached a particular stage of processing? Consider a music player activity that initiates the actual music playing in the background as an Android Service. I want to detect and inform the Activity when the Service has reached the Mediaplayer's onPrepared. Is there a way that the Service can tell the calling Activity when the MediaPlayer's onPrepared is called, to let the Activity know that the audio is prepared and ready to play?I am basically looking to see if there is work around, rather than having a thread in the activity, pinging constantly to check if the Service has reached onPrepared.
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Mar 15, 2010
Does anyone how I go about detecting when a user presses on a bitmap which is inside a canvas?
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Jan 25, 2010
I have an application with 2 activities, LogonAct and MainAct. LogonAct is a logon activity which I want to force the user to go through each time they return to the application. I've set android:clearTaskOnLaunch="true" on LogonAct.
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May 2, 2010
I have an Activity with a list that is bound to a ListAdapter reading data into a ArrayList from a database. All is well when the data is first loaded. While the Activity is open and the list is being displayed it is possible and likely that the data in the database will be updated by a service but the list does not reflect the changes because the ArrayList does not know about the changes. If the Activity is no longer in the foreground as would be the case if the user goes to the home screen and then is brought back to the foreground I would like for the Activity to not display what it did prior but rather reload the data using the ListAdapter the view is bound to. I think something needs to call finish() but I am not sure what.
This is what I have in the Activity.
CODE:.......................
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Oct 8, 2009
I am writing an activity where the user is supposed to some editing and is critical. In this activity, I dont want pressing of Call key to make it go to Call Log so I handle onKeyDown call back and there if the key pressed is Call, I just return true. That solves my problem. But, if Options menu is opened and then I press Call button, I am not getting control in onKeyDown.
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Apr 15, 2010
Experts: My MainActivity launches a SubActivity by calling: startActivityForResult(intent, REQ_CODE); The SubActivity shows a dialog that has two buttons: Yes, No For the dialog, I've the following code: public void onClick(DialogInterface dialog, int whichButton) {/* User clicked OK */setResult(DialogInterface. BUTTON_POSITIVE) ;finish();
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Jul 25, 2010
I have a main screen with buttons to launch other subactivities. I have to press back button each time to go back to the main screen of my application. How do I finish a child activity and automatically return from the caller?
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Mar 8, 2010
I want to do some activity on sms after user read it, so how can my background service in android know that particular sms is now read(when my service start work) to react for some task.
Is there system generate any integer when user read sms. if it generate than how will i get?
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Jul 9, 2010
I have a Contact Activity which is derived from ListActivity, which displays list of contacts, and on click of item, a new Activity Message Activity derived from ListActivity is initialized.Now I know, I can pack some information in Bundle and pass it before creating activity, but is there a way I can get instance of "ContactActivity" in onCreate method of "MessageActivity"?
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Sep 12, 2010
For something like a 'help I can't get up' app -- is there a way for a user to set a contact number, and then for the app to call that number in the future WITHOUT the user initiating the dialout? I've tried the below but there seems to be a problem. Code...
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Mar 31, 2009
I call WebView.clearHistory(), but I am still able to go back after doing so. I want to reuse a WebView, but I don't want the back button to allow the user to go back further than the current "session" of using the WebView. Anybody know what is the best way to handle this? I thought for sure that clearHistory() would do it.
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Oct 1, 2010
i seem to have a classic task, yet i can't find any examples on how to do it.i want to download something. well i call a web service and get a response but its pretty much the same.in order to do this i have an activity that starts a service that spawns a thread that does the job.now i would like to use the data i got in the activity that started the service.(i assume that starting another activity to handle the job of displaying the result would be simple)my problem is how does the service notify an activity (the one that started it or another one) of something.
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Nov 4, 2010
This is what I'm trying to support. Can this be done?
a) User is an Activity A in my app. b) The user is taken to the native dialer when he chooses a particular action in my Activity c) User presses the back key d) Taken to homescreen
Is there a way I can change it, so the back key press returns him to my app, instead of native homescreen?
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Jul 13, 2010
I have a app with 2 activities, A B A has a button that launches a new intent for B. When at B I press home, then launch app again, B is resumed with onResume(). But if after I press home, I use something like taskiller to clear tasks, then I launch app again, it still shows B, but onCreate() is called. What I want for the second situation is for the app to start A instead of B. How can that be done?
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Feb 28, 2009
I'm looking for a way to resume my activity (which makes phone call) after call ends by user. Currently after user ends a call, it always returns to the phone's native call-log screen instead of the activity that originated the call. Is there any way to prevent or customize this?
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Mar 14, 2010
Is it possible to configure an android app so that if a user has opened your app, launched numerous activities, then returns to the home screen and relaunches your app again, instead of going to the main activity they will instead be taken to the activity highest on the stack (the most recent activity in your app)?
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Oct 14, 2010
I have one main activity and one preference Activity. On my first activity I call menu and go on preference Activity by calling startActivityForResult. Code...
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Sep 10, 2009
As the title says? Or what situations can cause this method to return null? I would of thought it retained this object always.
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Jul 19, 2010
Newbie Question from an iPhone developer.
I have called the startActivity(intent) and the new activity loads. How do I go 'back' to the calling activity once a button is pushed. 'Popping' the activity off the stack basically.
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Mar 23, 2010
I have 3 classes in my example:
Class A, the main activity. Class A calls a startActivityForResult:
Intent intent = new Intent(this, ClassB.class);
startActivityForResult(intent, "STRING");
Class B, this class is a TabActivity:
Intent intent = new Intent(this, ClassC.class);
tabHost.addTab...
Class C, this class is a regular Activity:
Intent intent = this.getIntent();
intent.putExtra("SOMETHING", "EXTRAS");
this.setResult(RESULT_OK, intent);
finish();
onActivityResult is called in Class A, but the resultCode is RESULT_CANCELED instead of RESULT_OK and the returned intent is null. How do I return something from the Activity inside a TabHost?
I realize that the problem is that my Class C is actually running inside of Class B, and Class B is what is returning the RESULT_CANCELED back to Class A. I just don't know a work around yet.
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Dec 7, 2009
I have a TabActivity subclass that attempts to start a new activity via a menu item selection in onOptionsItemSelected.I am receiving the following exception which eludes me at the moment.I'm not sure why it thinks I am *not* in an activity!
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Nov 19, 2010
i am writing an app in which i need a background service to call an activity and show some result.
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Apr 4, 2010
me and my partners are working on developing a pwa client for android Am getting an error while calling an activity from another activity.the error is as follows...
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