Android :: Save State Of Droid Application When Back Button Is Pressed?
Sep 20, 2010
I have noticed while working in the emulator that whenever i get out of my app via any method other than pressing the back button, my toggle button (if pressed) will have its state saved and return to that state when i return to the app. im guessing its because its value gets saved in a bundle and reloaded when i return. when i leave the app via the back button, this does not happen and the toggle is always off when i return. is there any way to get the value of the toggle back if the user leaves via the back button, without having to save the value in a db table? alternatively, if my apps notification is in the status bar, i can be confident that the toggle should always be selected, so if there is no way to save the state, is there a way to find out if my apps notification is currently being displayed? then it would be easy to just set the toggle each time via a quick check of the status bar.
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Mar 17, 2010
I have an activity that contains several user editable items (an EditText field, RatingBar, etc). I'd like to prompt the user if the back/home button is pressed and changes have been made that have not yet been saved. After reading through the android documentation, it seems like this piece of code should go in the onPause method. I've tried putting an AlertDialog in the onPause however the dialog gets shown and then immediately tears down because nothing is there to block the pause from completing.
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Oct 24, 2009
I am having an issue related to home key . when i press home key all current activity gets hidden. but when i press the executable it again starts from the fisrt screen . I have overidden all methods nsaveInstaceState opPause onStop onResume
but there are still issues what is the right way to handle those conditions. When i am pressing home button i am storing the widgets state in database and when i again click the exectable i am checking the database state and starting the new Intent as saved when user presses the home button .Is it the right way to do that as i am facing the problem when user does the same and again presses the back button , there is already on intent available in stack of activity .
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Oct 4, 2010
I am trying to remove an ImageButton's background in only the default state. I'd like the pressed and selected states to behave as usual so that they look correct on different devices, which use different colors for the pressed and selected states.
Is there any way to set an ImageButton's background default state's drawable without affecting the pressed and selected states?
I've tried to do this with a selector, but it does not appear to allow you to use the default drawables for some states - you have to set all the states yourself. Since there's no API to retrieve the device's default pressed/selected drawables, I don't know what to set the pressed/selected states to.
I also tried getting the StateListDrawable object for the button that the system creates when you are not using a selector and then modify it change the default state. That didn't work either.
I seems that on Android, if you want to change the drawable for one state of a button, then you must set all the states, and thus cannot preserve the default drawables for the other states. Is this correct?
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Aug 11, 2010
Is android have application state, like background or front?I have a situation when need to update same data if app is coming to front.onRestart or onStart is not good idea, because this method fire when we come from another activity.
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Jul 16, 2010
I am developing an android application in which,the first activity is that for Login. After successful authentication, user can see an activity with 4 Tabs. My problem is that when user taps on the home button,the application should terminate and when the user again starts my application, he should be able to see the Login screen again and after successful Login, user should be able to see the tab on which he was working before application terminated(i.e., save state for all the tabs).
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Aug 9, 2010
I've encountered a problem wile using my own subclass of android.app.Application. I have numerous activities in my application and I'm running a custom ROM which consumes quite a lot of memory. What happens is when I launch a third party activity (Camera) my Application is killed. My Application subclass stores vital data for the whole app so it can't work without it. android.app.Application doesn't have any methods for saving or restoring application state. Activity does have them but they are not suitable.
How to perform save/restore state on Application subclass?
UPDATE I've managed to do so by filling a Bundle obtained from onSaveInstanceState and restoring values in onCreate. But is there any better way?
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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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Jan 11, 2010
As a follow on from my question on sharing state between Activities, how can I save the instance state of my Application? Since Application does not extend Activity, there is no onSaveInstanceState method to override.
NB: In advance, this is not a duplicate. Despite its name, How do I save an Android application's state? relates to Activity state
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Jul 8, 2010
I have a problem and that is my SplashScreen I have. It is built as an intro and after 3 seconds it shows the main menu of the program. Anyway, if I press down Back or Home button during the time the SplashScreen shows, it closes, but the activity I have chosen to follow after the SplashScreen will still run after the three seconds.
My code: **UPDATED CODE**
Handler ur = new Handler();
myRun = new Runnable() {
public void run() {
mainIntent = new Intent(SplashScreen.this,MyApp.class);
SplashScreen.this.startActivity(mainIntent);
SplashScreen.this.finish();..........................
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Apr 30, 2010
This is a bit complicated to explain (and my first post), so bear with me please: I am currently trying to figure out the best way of saving my application's state in a bundle on the onSaveInstanceState event (working on a game). My application's state is based on a "world" class which contains various objects. Among these objects there is a creature object which contains bitmaps (Bitmap object)(allowing me to draw the various sprites of the creature when it's walking with more flexibility and accessibility).
Bit of creature constructor Java:
CODE:.................
After looking around for a few hours I found that serializing the world object (and all its sub-objects) was an acceptable way of saving it in the bundle. Unfortunately it appears that we can't serialize bitmaps and considering they're a part of my "creature" I can't seem to see a workaround.
Here come my questions: 1- Am I doing something fundamentally wrong? (not supposed to save bitmaps in objects? supposed to handle bitmaps in a separate class which I don't pass on the bundle and reload my bitmaps when restoring the application? ...) 2- Is there another way of passing my "world" object into my bundle (would using Parcelable work?)
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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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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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Sep 10, 2009
There is know problem in all the Android phones. Go to Bluetooth Settings->Turn ON bluetooth->Click on bluetooth discovery->Then timer will start in summary->Long press on Bluetooth device discovery-> observe Bluetooth ON/OFF title start to toggle with Bluetooth Discovery toggle. I analyzed the issue. Blueooth ON/OFF is CheckBoxPreference. Bluetooth Discovery is also CheckBoxPreference which has dependency on Bluetooth ON/OFF. When we click on Bluetooth discovery then On thread will run at every second to update summary in Bluetooth Discovery preference. When we change the Bluetooth discovery to OFF then thread will be removed/ killed. When i press the Bluetooth discovery for long time when its already in ON State then still the thread will be updating the summary (remaining time from 120 to 00) till i press it. When i leave the Thread will stop. As it has dependency on Bluetooth ON/OFF, its making to the title invisible. But it should not happen. Solution: When i touch the Device Discovery i should kill the update summary thread then i guess, that problem will be solved. But in prefence i dont have any listener to know the pressed state. I hope somebody can give me solution.
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May 2, 2012
How to know whether a particular key (ex-KEYCODE_Q) is pressed or not in android at any instant.
Is there any API like(GetPressedState(int keycode))?
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Apr 16, 2010
In my android app I have a Tabhost with a ListView as one of the tabs. By clicking on an item in the ListView (an address) I start an Intent to Google Maps for directions and the choice dialog pops up for google maps, web browser etc. Problem is if I press the hard back button then the launch dialog goes away but also the ListView is cleared. Any idea why?
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Nov 16, 2010
I'm developing an application which allows user to edit an image and save that edited image as new image on sd card I want to get the current state of the canvas object.
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Sep 11, 2010
I have some 34 checkboxes on one Activity which i have to mark and unmark. and I want to save the status of the each checkbox.
I want this persistently. So should i have a sqlite table or preferences ?
If sqlite table is recommended, then what should be the ideal table structure design?
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Mar 9, 2010
I cant find a way to save the checkbox state when using a Cursor adapter. Everything else works fine but if i click on a checkbox it is repeated when it is recycled. Ive seen examples using array adapters but because of my lack of experience im finding it hard to translate it into using a cursor adapter. Could someone give me an example of how to go about it.code...
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Feb 19, 2010
In Android, you need to implement the following Activity methods so your application can be restored to its previous state if the OS decides to destroy then recreate your activity:
public void onSaveInstanceState(Bundle savedInstanceState)
public void onRestoreInstanceState(Bundle savedInstanceState)
The examples I've seen of implementing these methods is to use put/getBoolean, put/getInt etc. on the Bundle object (i.e. primitive objects only) to save the application state. This seems hugely error prone way to save your state for a start and I cannot see how this scales to storing complex objects without writing lots of code.
What options do I have for storing/restoring state in a robust and easy to implement fashion?
In case it's important, my application (a game) needs to store about 50 objects, which each store maybe 5 float variables and some store references to other objects. I don't particularly want to have to write save/restore methods for every class and subclass (maybe about 15 of these) I use. It would be ideal if I could just stick all my state relevant objects in an object called "state" and then just call save/load on "state" to handle everything.
Is using Java serialization an option? I've heard it's very slow, but is that a problem for save/restoring? Could I just write my data to the SD card? To a database?
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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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Apr 8, 2010
I am working on my App. in between i pressed the Home button on the device. my app will go to the background tasks. After that i long press the home button it will show my app as a persistent state. i.e where and what i had done in my app. But i click my app in the directory window it restarts my app. i want to do if my app is in the background tasks it will wake up else it will start. how to achieve that?
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Dec 30, 2009
Does anybody have any insight as to why a game appliction would restart when exiting with the back button. It does not automatically restart when using the Home button to exit and this only occurs one time (after the second attempt to exit with the back button, it exits cleanly). Also, I can reproduce this consistently on the Motorola Droid, but have not been able to reproduce on the G1 or the emulator running 2.0. I've tried changing the launchMode of my activities, but have not found something that works. These are my activities:
1. Splash Screen, Single Instance, Main/Launcher 2. Help, Single Instance 3. High Score, Single Top 4. Preferences, Single Top 5. Options, Single Top 6. Game, Single Top, with SurfaceView
The steps to reproduce the problem are: 1. User starts application, launching Splash Screen Activity 2. User starts game, launching Game Activity 3. Game Activity launches Options Activity (for result) 4. Game Activity restarts with result and game begins. 5. Pressing Back Button returns to Splash Screen Activity 6. Pressing Back Button again, briefly shows home screen, then relaunches Game Activity which starts Options Acitivity 7. Pressing Back Button again finally shows the home screen
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Sep 24, 2010
Either exit button or back button only can be implemented in my application. But i want both the implementations in my application
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Jun 1, 2014
i have a drawer menu, when i press one of its buttons to start a sharing intent as below:
Code:
Intent iFriends = new Intent(Intent.ACTION_SEND);
iFriends.setType("text/plain");
iFriends.putExtra(Intent.EXTRA_TEXT, "http://www.liveplus.mobi");
iFriends.createChooser(iFriends, "Invite Friends");
startActivity(iFriends);
The sharing dialog appears, but if i press the back button, the whole application exits!
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Jan 30, 2009
Does anyone know how to tell when the headset button is being pressed? I'd like to support the usb headsets and possibly bluetooth headsets. My app is a media player and ideally, I could register it somewhere so that if no app that uses the headset button has focus it button press would act as a play/pause command in my app. If the phone is ringing or a call is in progress, I'd like to be sensitive to that and let the button do what it normally does: pickup and hang up calls. we've been trying to chase the button down using this: Intent Filter headset Filter = new Intent Filter (Intent.ACTION_HEADSET_PLUG); headset Filter.addAction ("android.intent.action.HEADSET_STATE_CHANGED"); headsetFilter.addAction("android.bluetooth.intent.HEADSET_STATE"); headset Filter.addAction ("android.bluetooth.intent.HEADSET_STATE_CHANGED"); headset Filter.addAction ("android.bluetooth.intent.action.MODE_CHANGED"); headsetFilter.addAction("android.intent.action.MODE_CHANGED");
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Jul 14, 2010
Is there a way I could get the color that is used when a button is pressed? I know that the button uses a default selector xml that consists of the pressed image. But, I am having some custom buttons for which I want it to be close to the default image used for pressed state.
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Nov 18, 2010
Is there an easy way in android to get the pressure that the user extended during an onClick event?
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Sep 30, 2009
i have an app widget that has a couple of buttons on it, and in my onUpdate() call, I am hooking up the buttons to do something when you press them
RemoteViews remoteViews = new RemoteViews(context.getPackageName (), R.layout.appwidget); remoteViews.setOnClickPendingIntent(R.id.Button1, button1PendingIntent); remoteViews.setOnClickPendingIntent(R.id.Button2, button2PendingIntent);
The problem is that when I click on button2, it sends the button1 pending intent. i think that's because it's reusing the pending intent. http://groups.google.com/group/android-developers/browse_thread/threa. "If the creating application later re-retrieves the same kind of PendingIntent (same operation, same Intent action, data, categories, and components, and same flags), it will receive a PendingIntent representing the same token if that is still valid, and can thus call cancel() to remove it." So then the question is, how do I communicate which button was pressed?
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Feb 5, 2009
I have an application with main view having a search button. On clicking the search button, search results are displayed in a text view. When I hit the back button at this view, instead of navigating to the previous screen, application itself gets closed. Could anybody please let me know how to go back to previous screen.
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