Hi Nivek,
Unfortunately, doing recycle on the drawable returned by
ContextWrapper.getWallpaper() results in a run-time exception the next
time the app is launched: attempt to use recycled bitmap. Though
curiously, if I launch the app again after receiving the exeption, it
works fine. I.e., run time exception every other launch.
At any rate, thanks for the pointer to Romain Guy's blog -- I
wasn't aware of the onRetainNonConfigurationInstance method. Should
be useful in some cases.
Cheers,
Steve
On Aug 17, 10:53 am, Nivek <[email protected]> wrote:
> When you change the device orientation, you app is closed and then
> reopened.
>
> Android handles bitmaps a "special" way, you HAVE to explicitly
> recycle them as soon as you don't need them anymore... or they stay
> allocated in memory and NEVER get freed.
>
> I have started to code an app which uses a set of ImageViews. To avoid
> allocation errors on orientation changes, I had to override the
> onDestroy() method this way :
> /*
> * (non-Javadoc)
> *
> * @see android.app.Activity#onDestroy()
> */
> @Override
> protected void onDestroy() {
> super.onDestroy();
> if (isFinishing()) {
> for (ImageView view : mImgViews) {
> Drawable toRecycle = view.getDrawable
> ();
> if (toRecycle != null) {
> ((BitmapDrawable)
> toRecycle).getBitmap().recycle();
> }
> }
> }
> }
>
> After this, If the orientation change time is too long, you have to
> store the data (bitmaps and whatever else you need) with
> onRetainNonConfigurationInstance() and get them back on reinit with
> getLastNonConfigurationInstance().
>
> This has been explained by Romain Guy on his blog
> :http://www.curious-creature.org/2009/02/16/faster-screen-orientation-...
>
> On 17 août, 15:58, Flying Coder <[email protected]> wrote:
>
>
>
> > This has been driving me nuts and I'm hoping someone will be able to
> > help me understand what is happening (or better yet, how to fix
> > it! ;-).
>
> > I set the background image in one of my apps to the system wallpaper
> > image using the following code:
>
> > Drawable wp = this.getWallpaper();
> > background = (ImageView) findViewById(R.id.background);
> > background.setImageDrawable(wp);
>
> > This seems to work fine, but periodically, I get the out of memory
> > error shown below. Actually, on the emulator, all I have to do is
> > repeatedly rotate the device and this error will consistently happen
> > after 10-12 rotations. On the G1, opening and closing the keyboard
> > doesn't seem to cause this, but I'll still get the failure every once
> > in a while.
>
> > Is getWallpaper() actually making a copy of the image (I would have
> > thought I'd just get a refernece to the existing bitmap)? Do I need
> > to do anything special to free the image?
>
> > 08-17 08:32:37.943: ERROR/dalvikvm-heap(1597): 614400-byte external
> > allocation too large for this process.
> > 08-17 08:32:37.943: ERROR/(1597): VM won't let us allocate 614400
> > bytes
> > 08-17 08:32:38.054: DEBUG/AndroidRuntime(1597): Shutting down VM
> > 08-17 08:32:38.054: WARN/dalvikvm(1597): threadid=3: thread exiting
> > with uncaught exception (group=0x4000fe70)
> > 08-17 08:32:38.054: ERROR/AndroidRuntime(1597): Uncaught handler:
> > thread main exiting due to uncaught exception
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597):
> > java.lang.OutOfMemoryError: bitmap size exceeds VM budget
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at
> > android.graphics.BitmapFactory.nativeDecodeFileDescriptor(Native
> > Method)
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at
> > android.graphics.BitmapFactory.decodeFileDescriptor(BitmapFactory.java:
> > 424)
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at
> > android.app.ApplicationContext.getCurrentWallpaperLocked
> > (ApplicationContext.java:523)
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at
> > android.app.ApplicationContext.peekWallpaper(ApplicationContext.java:
> > 515)
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at
> > android.app.ApplicationContext.getWallpaper(ApplicationContext.java:
> > 504)
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at
> > android.content.ContextWrapper.getWallpaper(ContextWrapper.java:201)
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at ....onCreate
> > (MyApp.java:247)
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at
> > android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:
> > 1123)
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at
> > android.app.ActivityThread.performLaunchActivity(ActivityThread.java:
> > 2231)
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at
> > android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:
> > 2284)
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at
> > android.app.ActivityThread.access$1800(ActivityThread.java:112)
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at
> > android.app.ActivityThread$H.handleMessage(ActivityThread.java:1692)
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at
> > android.os.Handler.dispatchMessage(Handler.java:99)
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at
> > android.os.Looper.loop(Looper.java:123)
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at
> > android.app.ActivityThread.main(ActivityThread.java:3948)
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at
> > java.lang.reflect.Method.invokeNative(Native Method)
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at
> > java.lang.reflect.Method.invoke(Method.java:521)
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at
> > com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run
> > (ZygoteInit.java:782)
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at
> > com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540)
> > 08-17 08:32:38.313: ERROR/AndroidRuntime(1597): at
> > dalvik.system.NativeStart.main(Native Method)- Hide quoted text -
>
> - Show quoted text -
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