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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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...
I draw 2d images on the canvas using the following tutorial.
http://www.designerandroid.com/?cat=3
I want to save what ever displaying in a canvas as a jpg image, how can i do it?
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?
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...
View 3 Replies View RelatedI 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.
View 1 Replies View RelatedIn 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?
I want to get the current bitmap associated with my canvas so I can perform operations on it. I can't see how to do this though.
I've seen some examples where you create a bitmap and set the canvas to use this bitmap, so obviously you can then access it later, but I'm using the canvas returned from a SurfaceHolder so there's no constructor.
For instance, examples often show this kind of thing:
CODE:...........
So at this point I can see bmp.
In my case, the canvas is obtained by:
CODE:......
So how can I get the bitmap for c?
In short, my aim is to capture the current canvas contents where I have drawn "stuff", and make a copy of it, reversed, to put underneath. Like a reflection. The example of this that I found performed it all via bitmaps, so I assumed I needed to somehow capture the current canvas to a bitmap to then use it.
I need a small help on rotating one image around its center of axis among multiple images which are drawn to canvas in android.
I am loading images to canvas like below.
canvas.drawBitmap(mMachineBackground, 0, 0, null);
canvas.drawBitmap(mMachineRotator, 0, 0, null);
I want to rotate only the second bitmap around its center of axis instead of rotating the entire canvas(which includes first bitmap also).
how to get font from the previous activity on current activity on canvas
View 1 Replies View RelatedYes, 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?
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.
View 2 Replies View RelatedI know how to set the background of an XML layout as your current wallpaper, but I'm trying to find out how to set the background of canvas as current wallpaper.
View 1 Replies View RelatedI want to capture much larger image than the current small image captured by the android g1 phone camera.
View 9 Replies View RelatedIs it possible to retrieve the current State of a Media Player?
View 23 Replies View RelatedI am doing a painting program (KIds Paint - you can find in Android Market) and I have a lot of requests to save the content on disk or to wallpaper. I have been searching around but cannot find solution. My guess is that I probably wanted to get the bitmap from the canvas, but I can't find ways to get it. Then I try to set an empty bitmap into the canvas and draw on the canvas, and save the bitmap... but I got an empty bitmap..........
View 7 Replies View RelatedI 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?
View 3 Replies View RelatedMy 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?
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?
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();
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?
View 1 Replies View RelatedI 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).
View 3 Replies View RelatedI'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?
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.
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?
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?
View 2 Replies View RelatedI 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.
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.
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.
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