Android :: Back Button Activity

Aug 25, 2010

I was wondering how or if it is possible to exclude activities from the back buttons history list? For example not letting the user back into the Splash Screen?

Android :: Back Button Activity


Android :: How To Control Activity Flow - Back Button Versus Home Button

Sep 2, 2010

I have 3 activities in my app: Activity1 -> Activity2 -> Activity3. Inside Activity3, if the user presses Back, I would like to return to Activity2. In Activity3's onPause event, I added a finish() statement. That's probably not even necessary, but I wanted to make sure this Activity gets cleaned up. This works fine.
However, while in Activity3, if the user presses Home or starts a new app (through notification bar or some other means), I want both Activity3 and Activity2 to finish. If the user returns to this app, he should resume with Activity1.

I have figured out how to do one or the other, but I can't figure out how to handle both cases, if it's even possible. Can I trap the "Back" button in Activity3 and send a message back to Activity2 telling it not to finish()? It seems like the Activities follow the same lifecycle flow (Pause, Stop) regardless of what you do to send them to the background. Just to answer the question of why I want this behavior, imagine that Activity1 is a login screen, Activity2 is a selection screen, and Activity3 is a content screen. If I press Back from the content page, I want to be able to make a new selection. If I exit via any other means (Home, notification bar), I want the user to be "logged out".

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Android : Activity And Back Button

Nov 2, 2010

on the ui i am having a back button displayed. there are three activities say A,B,C. Activity A is splash screen. Activity B is home screen. Activity C is edit screen. on edit screen only i am having a back button. when the user press that i open the activity B which also contains some sort of http request and response. i want that the previous activity from stack should get displayed? how can i achieve that? i am able to open previous activity on pressing the back button of device? when i press back button on device there doesnt goes any http request? i want to achieve this behaviour when i press the ui back button.

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Android : Back Button And Last Activity

Aug 17, 2010

My app chains some activities.

if you press the back button, you go back through old activities then you suddenly quit the application !

so I need to show a message like "do you really want to exit" if it's the last activity on stack

I know how to override the back button but i can't figure how to know how many activity are in history

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

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Android :: Star Activity And Back Button

Oct 22, 2009

I am starting an external activity from my application and would like the back button to return the user to the point in my application where they started the activity. is this possible?

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Android : Back Button Not Stopping Activity

Feb 28, 2009

In my game, I've got one activity starting another activity via an intent. When the user is finished with the second activity, they quit it using the back button. However, I have a problem: when this happens, the second activity is still running, even if it's quit with the back button.

My second activity will eventually give a "game over" message using a pop up window if there is no user input for a period of time. Problem is, when I back out of the second activity (where the game is happening) the "game over" message still appears eventually. This is how I know the second activity is still running. It even displays a "game over" message if my entire app is quit (on the Android OS).

How do I stop an activity completely when the user presses the back button?

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Android :: Back Button Doesn't Go To Previous Activity

Jul 4, 2010

I have two activities. The first is a list where the user selects one of the items which takes them to a second activity showing the details of the item they selected. When the user clicks the back button I want the app to return to the first activity.

Is there anything special i need to do to make this happen?

Right now when I click the back button from the second activity it exits the app just like the home button would.

Here is how I am starting the Second Activity. startActivity(new Intent(getApplication(), SecondActivity.class)); finish();

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Android :: Moving Back To First Activity On Button Click

May 5, 2010

I am writing a application where I am dealing with 4 activities, let's say A, B, C & D. Activity A invokes B, B invokes C, C invokes D. On each of the activity, I have a button called "home" button. When user clicks on home button in any of the B, C, D activities, application should go back to A activity screen ?

How to simulate "home" button in this case ?

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Android :: How To Pass Result From Activity Terminated By BACK Button?

Apr 20, 2010

I am trying to setResult after the BACK button was pressed. I call in onDestroy. So, how can I pass result from activity terminated by BACK button?

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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 :: Activity State On Pressing Back And Home Button On Screen

May 6, 2009

Whenever I press the home button when Im in the root task of my application and when I click on the icon of my app again the state of my task (activity) is retained, but when i press the back button on the emulator and when I open my application its state is not retained. I want the state to be retained in both the scenarios.

In the mnifest I have given the below entries,

android:alwaysRetainTaskState="true" for the root activity

android:launchMode="singleTask" for the application

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Android :: Don't Need Previous Activities Load On Pressing Back Button On First Activity

Jul 15, 2010

When i leave my app after pressing home button and then re launch it from menus it behaves in a strange way.Sometimes it launches the same activity on which i pressed home button.But sometimes it launches the first activity of my app. One reason for this could be that whenever system has memory shortage it clears any activities existing in But the strange thing is if i press back button from first activity it takes me back to the same activity on which i pressed home button and all other previous activities are also there(like if i press back button again previous activities also exist.)I haven't set any launching mode for any activity in my app(like single instance etc).What i don't need is that previous activities load on pressing back button on first activity.

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Android :: Main Activity Grayed-out / Disabled On Back Button - Cause This Problem?

Jun 25, 2010

I have a problem on going back (clicking the Back button) from sub-activity to main activity: from my main activity I launch a new one (with passing some extras). code...

In the started activity I am getting data from extras and showing, etc. So everything works very well until I click Back button to return back to main activity. Then main activity appears but directly after - grays-out. I can't do anything there anymore... This "grayed-out" style looks something like there should be a dialog displayed, but there is no dialog shown, just the whole activity is pushed down/disabled instead...

One another interesting thing I noticed - that activity is still alive in background, because if I click "Search" button the Quick Search Box appears on top of my activity and if I click Back button then (to cancel it) - it disappears and my activity then becomes fully functional again (gray-out effect simply disappears...)

Tried watching logcat, but it shows nothing useful, no exceptions thrown, just this text always comes up:

W/KeyCharacterMap( 564): No keyboard for id 0
W/KeyCharacterMap( 564): Using default keymap: /system/usr/keychars/qwerty.kcm.bin

What could cause this problem?

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Android :: Pass Value Back To Same Activity On Button Click And Refresh Page?

Jan 21, 2010

I need to pass a value back to the same activity and refresh the activity to generate new data. Can anyone please provide me some ideas/guidance on how to do it?
I had try using intent to call the same activity but it doesn't work. Here is the code which i tried to use intent code...

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Android : Make An Activity Destory When User Presses 'Back Button?

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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Android :: On Logout Clear Activity History Stack Preventing Back Button

Jun 9, 2010

All activities in my application require a user to be logged-in to view. Users can log out from almost any activity. This is a requirement of the application. At any point if the user logs-out, I want to send the user to the Login Activity. At this point I want this activity to be at the bottom of the history stack so that pressing the "back" button returns the user to Android's home screen.

I've seen this question asked a few different places, all answered with similar answers (that I outline here), but I want to pose it here to collect feedback. I've tried opening the Login activity by setting its Intent flags to FLAG_ACTIVITY_CLEAR_TOP which seems to do as is outlined in the documentation, but does not achieve my goal of placing the Login activity at the bottom of the history stack, and preventing the user from navigating back to previously-seen logged-in activities. I also tried using android: launchMode ="singleTop" for the Login activity in the manifest, but this does not accomplish my goal either (and seems to have no effect anyway). I believe I need to either clear the history stack, or finish all previously- opened activities. One option is to have each activity's onCreate check logged-in status, and finish() if not logged-in. I do not like this option, as the back button will still be available for use, navigating back as activities close themselves. The next option is to maintain a LinkedList of references to all open activities that is statically accessible from everywhere (perhaps using weak references). On logout I will access this list and iterate over all previously-opened activities, invoking finish() on each one. I'll probably begin implementing this method soon.

I'd rather use some Intent flag trickery to accomplish this, however. I'd be beyond happy to find that I can fulfill my application's requirements without having to use either of the two methods that I've outlined above. Is there a way to accomplish this by using Intent or manifest settings, or is my second option, maintaining a LinkedList of opened activities the best option? Or is there another option that I'm completely overlooking?

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Android :: Prevent Activity From Saving State When User Selects Back Button

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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Android : Avoiding An Activity To Destroy - Just Stopping Or Pausing It When Pushing The Back Button

Mar 19, 2010

I would like to pausing or putting the application on background when pressing the back button, I don't want the application to go through the destroy state. Things are when I override onKeyDown and when I force to pause or stop the application by using onPause, I have some issuees with the wakelock and application crash, but when I press home button I go through onPause method and I have no exception, it's weird!

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Android :: Activity Which Downloads Data In Background With Service - Doesn't Get Destroyed On Hitting Back Button

Nov 9, 2010

I need to develop an application with downloads the data at the background and update about the progress in the front.

I guess this can be achieved using services and activity and passing data in between the. But, what I need to do is even if I hit back button and then start the activity again. It should check if the service is running or not. If service is not running it should start one else it should display the data from running service.

Something like music player where music is played by a service at a background and activity displays the information. Even on browsing through other activities of the application or hitting back, state of the music player is maintained.

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Android :: Android - Override The Back Button So Doesn't Finish - 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 :: Android Activity With Splash Screen Restart And The Back Button

Nov 8, 2010

I have an Android app with a splash screen.

This splash screen pre-loads data and when finished starts the application's main activity and finishes (through a finish() call).

This works quite well as long as the application is not totally killed. So, I can usually switch back and forth between different tasks as usual: when I leave the app from a sub activity and return soon after I will be presented with this sub activity.

Now, when I leave this sub activity and do some other stuff for a while inevitably this application process is killed by the OS.

No problem so far. Now I would expect Android, being unaware of my preloading (if the data was not preloaded it would just take longer or not display some fonts, but Android cannot be aware of the fact that I am doing preloading somewhere), to restore the sub activity from a Bundle. However the splash screen activity is started.

So, I say, that's fine then... the splash screen activity is after all the launcher / main activity. Now, the actual mystery I have is as follows.

When I press the back-button from this newly loaded splash screen I will be presented with the sub activity I left the application from before it got killed. I really don't understand this. Apparently Android DID save the sub activity's state (and its history stack) to be reloaded but instead of reloading it chose to start the splash screen instead, with this sub activity (I left the task earlier before it got killed) one step back on the activity stack.

Why does this happen?

When the process is not killed I can switch back to where I left off. When it's killed I cannot (yet still have the whole earlier history of that app restored). I know that Android has to load state etc. in the latter case, but that shouldn't be a problem and is performed automatically by default (according to the docs).

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Android :: Android Back Button Does Not Restart Activity

May 8, 2010

My app intiates an activity. On the click of a button, the app opens up the browser with a webpage. When I hit the back button, it comes back to my initial activity screen, but does not resume or restart the activity.

When I put all the layout code and activity code in onResume instead of onCreate, the activity gets restarted.

My question is whether this is the right way to go about it? Can I use onResume to draw my layout and initiate the activity, or is this poor design? When the browser fires up, does the initial activity forget its layout?

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Motorola Droid X : Back Button Functionality - Cannot Simply Go Back One Menu Using The Back Key

Jul 15, 2010

This is my first android device and i'm loving it... but one thing that irks me is the use, or lack thereof, of the back button.

As I am navigating menus and options in the Settings, I cannot simply go back one menu using the back key. For example, if I go to Settings->Battery Manager->Battery Profile Options and want to go back to the Settings screen, I cannot.

Pushing the back button does nothing and I can only go back to the Settings menu by going Home, then re-entering.

Another quirk regarding the back button is when reading emails. Using a regular email account such as Hotmail, I cannot simply read an email and go back to the inbox using the button.

It makes navigating the phone very tedious.

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Android :: WebView.clearHistory() - Don't Want Back Button To Allow User To Go Back Further Than Current Session

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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Android : Back Button - Disable In Buffering Or Should Prevent The Player Tostart If Back Is Clicked

Oct 11, 2010

In my android application i have a video list screen,a buffering screen and a videoplayer screen.
As soon as the user clicks an item from videolist screen ,he is navigated to buffering screen and then to videoplayer.
In the buffering screen i am using Async task and doing the loading process in on background process.

Now my issue is like the user if has selested a video then gets navigated to buffering screen.But if the user clicks back when he is in buffering screen then initially he is getting navigated to videolist screen but immediately after that again he is navigated to videoplayer screen.

What i would like to have is either the back button should be made disable in buffering or should prevent the player tostart if back is clicked.

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Android :: Ok Button On AlertDialog Should Work As Back Button

Jun 16, 2009

In My code I am displaying a AlertDialog based on some condition.

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

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Android :: Starting Second Activity From Main Activity On Button Click

Dec 4, 2009

Need an example of how to create/start a new activity from the main activity. I have a button click event on the main layout. Originally I just used setContentView(R.layout.secondactivity); which brings up the layout but I don't think that is correct since the secondactivity class is not instantiated at this point yet. I have looked for such an example and can not find one.

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Android :: Start An Activity And Return Back To Original Activity

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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Android :: How To Clear Activity From Second Activity Going Back To Home Screen?

Mar 3, 2010

example scenario is: from login screen - main screen - then when i clicked a hide button the app will go to home screen, and when im going to click the app again the main screen would be called.

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Motorola Droid X : Back Button - Swipe Left To Right On Maybe The Top Bar It Goes Back

Jul 19, 2010

I'm finding that I'm using the back button A LOT whether browsing the web or just navigating the OS. It kind of sucks because the buttons on the droid x are well, really small, and sometimes hard to press because they are so narrow and flimsy feeling. And depending on how you are holding the phone, it could be a good bit of distance for your thumb to travel or I'm finding myself having to reposition the phone in my hands just to reach the back button, which you seem to need very frequently.

Anyone know of any kind of back 'swipe' implementation ? Like some software you can install that makes it if you swipe left to right on maybe the top bar it goes back?

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