Android :: Phone Won't Save Current State Of An Activity / Way To Do
Nov 17, 2010
I am trying to save some values in the onSaveInstanceState(Bundle) method of my activty by following the example here: How do I save an Android application's state?
But it doesnt seem to load it from the Oncreate(). the bundle object is always null but whenever i call another activity, it does indeed go into the onSaveInstanceState method to save my values.
Now i read that question i just posted and someone noted how they could not get it to work in an emulator? unfortunately that is all im working on. On an emulator and cant test the app on the device as i have no device available to me right now And the web services i am interacting with are in a local VM on my work machine that cannot be accesses remotely at the moment.
My question is, is it true that saved bundles dont work on emulators? I also noticed how when i do dismiss or bring up a new activity , the activity calles onPause and then onStop. when i bring back the same activty, it goes straight to onCreate?
now according to the docs here http://developer.android.com/guide/topics/fundamentals.html#actlife That is correct in terms of what the lifecycle diagram shows but if you read below that diagram on the onStop() section it says the next step it goes into is either onRestart() or onDestroy()? no mention of onCreate? Type on the docs?
Anyways here is my onSaveInstanceState() and onCreate() both in the same activity: code...
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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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May 17, 2010
I am trying to make a task switcher and i succed in it. My only problem is that when I launch activities, they are relaunched as they were new activities ( for instance, I am writing an email, i press home and go into my activity,launch email, and then the app launch the email bout goes back at the inbox and the email is lost) So that's not true multitasking.
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Jan 22, 2009
In an ActivityUnitTestCase I'm trying to do:
CODE:...............
But on the save state call I get this trace:
CODE:.................................
Going through the ApplicationContext source code I've found this (http://tinyurl.com/d8qsyc):
CODE:...................
It seems the problem is that the activity token is not set. But here I'm puzzled, I don't know where to go next. Any ideas on how to fix it or workaround it are appreciated. I want to test that my application is saving its state correctly.
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Jul 1, 2010
I have an Activity, which contains a bunch of check boxes and a submit button.
When the submit button is clicked, the activity will exit (finish() will be called). Before the activity exits, I want to save the states of the check boxes in the activity, so when the activity starts again, the check boxes can stay in their previous states. What's the correct way to save these states? Should I use SharedPreference.
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Feb 22, 2010
I have a basic app with text inputs, a spinner input, and a second spinner input whose array depends on a setting changed in the Options menu. Currently, when I press Home or press Return while in my app, I either return to the desktop or cycle back through old inputs i put in recently. How can I prevent my app from opening multiple instances of itself so that there is only one instance running at any given time, and then how can I save the data entered into inputs, and the settings chosen in my option menu? I'm a bit new to Java, so I apologize if this is a simple problem.
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Aug 30, 2010
I am writing an app where I get all the data from the rest call and display all the data in a custom component list(based on Linear Layout) which is added to a LinearLayout. I write this code in onCreate of the activity. The problem is when I switch activity using startActivity, and come back to the calling activity (using startActivity) then onCreate is called again. I see onPause, onStop called when I call other activity. Is there any way that I can save the application's state?
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May 13, 2010
The default behavior of an activity when BACK softkey is pressed is, GO BACK TO PREVIOUS ACTIVITY. If some the same activity is waiting for some response from server or some data updation is going on and then press BACK, I want to wait on the same screen till the current task is completely processed and then move out to the previous activity.
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Feb 7, 2010
Yes, I can get sensor update events with SensorEventListener. But this approach has 2 drwwbacks:
1) For some sensors I have to wait for the state to update. For example, temperature may update after a minute!
2) In some cases I can get incorrect readings. For example, the phone lies on a flat surface and does not move. I receive first orientation update event after listener registration. When only a part of the orientation vector changes, other parts may be 0. And it is no way to determine, is it a true 0 degree azimuth or just an incomplete vector. If I move the phone a little, the correct non-zero azimuth appears.
To solve this problems it's possible to create a separate thread that constantly monitors sensors. After some time it will certainly contain true values. But I think that it is an overhead for such simple task.
Is it any other way to get current sensor data?
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Apr 28, 2009
Is it possible to retrieve the current State of a Media Player?
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Aug 7, 2010
I recently rooted and am having issues with my current ROM. My question is, can someone tell me how to do a backup of its current state now. So that way i can try a different ROM. And if its worse i would be able to go back to this one right?
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Aug 16, 2009
My applications carries on processing when the user presses the home key, and generates status bar notifications if something happens the user requested to be notified about.
If a user holds the home key and then selects the application, it is restored in its correct state with the activity on top that showed when the user left.
However, since the intent that is associated with the status bar notification is FLAG_ACTIVITY_NEW_TASK and I put in the class name of the activity that launched the application (I assume this is what I must do?), the launcher activity is started when the notification is "clicked". I can then switch the application back to the current activity by starting that "active" activity again, but then I seem to have two instances of the activity in memory, since I have to press back twice to leave it. And I suspect my activity stack is then messed up as well.
I have set the launcher activity to be singleTask, but that only helped a bit. From my reading I thought this would just give the task focus if the launcher activity is not on top, but instead it gives the launcher activity the focus.
Is there a way for a notification click to work more like the task switcher provided by long pressing the home button?
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May 31, 2010
I am trying to determine if my current connection state is WIFI or Cell network (3g/2g... etc)
I am using SDK 1.5.
Tried couple of technique not really working.
Any working suggestions?
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Sep 1, 2010
can someone helpme out with how to save state of the app when the screen orientation is changed i read the development guide at http://developer.android.com/guide/topics/resources/runtime-changes.html#HandlingTheChange
But i dont know how to define the method collectMyLoadedData();
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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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Sep 4, 2010
In a previous question I asked how I could display two different layouts for portrait and landscape orientations:
Problem switching to landscape orientation
Now I would like to know how I can save the state of my application before it goes into another orientation? I seem to lose this data any time orientation changes.
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May 23, 2012
When I do factory reset (which means the same as 'wipe', right?) it does resetting current installed ROM to its original state, right?
So, let's say I am doing factory reset the first time (so currently my phone has store ROM installed) so factory reset will revert all the changes in the installed ROM (such as settings, installed apps, all the data) to its original state - which the phone had since it got ROM installed.
But If I got root (which means I replaced secured kernel with unsecured one) and I installed another customized ROM and for some reason I want to do factory reset again - what's gonna happen?
Will factory reset revert original store ROM back or it will revert manually installed ROM (customized ROM) to its after installation?
And as far as I understood factory reset does nothing with kernel? It only affects ROM? So in the second case , when I use non-store ROM and I am doing factory reset - nothing will happen with my unsecured kernel?
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Aug 27, 2010
My app is comprised of a set of reusable Activities that other apps can reuse. For various reasons, I would like my Activities to be launched in context of the invoking Activity's process, instead of always being launched in my Activity's process (default behavior on Android). How can I achieve this?
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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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Nov 5, 2010
The default behavior from my observation is if current activity force closes Android tries to go to previous activity on stack How can I control this behavior? I want force close to close all activities
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Jul 16, 2010
I used Toast to make notification, but it seems it will appear even its activity is not in the current screen and some other activity has been started.I want to check this situation, when the activity is not the current one, I'd not send the Toast notification. But how to do ?
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Oct 12, 2010
I was looking at the way Android handles orientation change for my application (I discovered that it restarts the mainactivity on orientation change :| ). I've seen that you can ovveride the method protected void onSaveInstanceState(Bundle outState)to save stuff, then have the in onStart. The problem is that I've my view with custom objects and a listview using a custom adapter... Everything is in a ArrayList of these objects, but I've noticed that you can't put arbitrary objects in the bundle! So how do I save the state?
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Sep 24, 2009
I wonder what is the right way to implement this? Could anybody advice whether my solution is correct?
So:
Activity is created
User clicks on button and dialog is launched (Dialog, not dialog styled activity)
User opens keyboard
we have onSaveInstanceState called where we save that our dialog was opened and all respective dialog input
we have onRestoreInstanceState and here we check whether dialog was shown, recreate the dialog with respective input.
Is it the right approach? or there is smth. that is done by Android and I am doing some redundant actions.
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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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Feb 8, 2009
I'm a little confused by what I'm seeing with regards to phone state transitions via the PhoneStateListener. When I receive a call, this is what happens: (call comes in) RINGING -> IDLE (I pick up) OFFHOOK (I hang up) IDLE It's that first transition from RINGING to IDLE without any interaction from me (not ending the call, not answering the call) that confuses me. Do I really have to implement an idle counter to know that an incoming call has really ended? Seems like the reported phone state represents some sort of phone state that isn't the obvious one.Is this a bug or am I just not in tune with the paradigm here?
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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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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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Jul 3, 2010
I created an instance of a custom class RestaurantList to hold my data (a list of restaurant data received from a web service as json data).How can I save it in onSaveInstanceState? Code...
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Sep 29, 2010
I'm new to android, please help me how to save the state of checkbox,
i.e.
I've ListView with checkbox, three textview and again checkbox. I wish to save the checked state of item(s),
how to save the state of checkbox.
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