Android Question OutOfMemoryError

[pantaraf]

Hi,
I'm starting to debug my app, when running in Release after using the app for a while switching between the different activities it crashes always with the following exception:

java.lang.OutOfMemoryError
   at android.graphics.Bitmap.nativeCreate(Native Method)
   at android.graphics.Bitmap.createBitmap(Bitmap.java:605)
   at android.graphics.Bitmap.createBitmap(Bitmap.java:585)
   at anywheresoftware.b4a.objects.drawable.CanvasWrapper.Initialize(CanvasWrapper.java:76)
   at com.pantasoft.ApiDroid.textscaler._scaletext(textscaler.java:42)
   at com.pantasoft.ApiDroid.arnie._activity_create(arnie.java:373)
   at java.lang.reflect.Method.invokeNative(Native Method)
   at java.lang.reflect.Method.invoke(Method.java:511)
   at anywheresoftware.b4a.BA.raiseEvent2(BA.java:174)
   at com.pantasoft.ApiDroid.arnie.afterFirstLayout(arnie.java:98)
   at com.pantasoft.ApiDroid.arnie.access$100(arnie.java:16)
   at com.pantasoft.ApiDroid.arnie$WaitForLayout.run(arnie.java:76)
   at android.os.Handler.handleCallback(Handler.java:605)
   at android.os.Handler.dispatchMessage(Handler.java:92)
   at android.os.Looper.loop(Looper.java:137)
   at android.app.ActivityThread.main(ActivityThread.java:4424)
   at java.lang.reflect.Method.invokeNative(Native Method)
   at java.lang.reflect.Method.invoke(Method.java:511)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
   at dalvik.system.NativeStart.main(Native Method)

All the bitmaps are loaded using LoadBitmapSample.
Things went a little bit better after I've put a call to Activity.RemoveAllViews on each activity Pause event.
This happens on three different devices (Asus eeePad Transformer, LG L5, Google Nexus 7).
The app is far from being stable. Any hint from which I can start to investigate?
This crash doesn't happen at all while running in Debug mode.

Thanks.
Raffaele

 

[Erel]

Can you post the code in TextScaler.ScaleText?

 

[pantaraf]

Sub ScaleText(btn As Button, V As View)
  Dim btnCanvas As Canvas
  Dim testo As Float
  Dim fontsize As Int
   
  btnCanvas.Initialize(V)
  testo=btnCanvas.MeasureStringWidth(btn.Text,Typeface.SANS_SERIF,btn.TextSize)
  fontsize=btn.TextSize
  Do While(testo<(btn.Width/1.76))
  fontsize=fontsize+1
    testo=btnCanvas.MeasureStringWidth(btn.text,Typeface.SANS_SERIF,fontsize)
  Loop
  Do While(testo>(btn.Width/1.76))
  fontsize=fontsize-1
    testo=btnCanvas.MeasureStringWidth(btn.text,Typeface.SANS_SERIF,fontsize)
  Loop
  btn.TextSize=fontsize
End Sub

 

[eps]

What size in pixels are the Bitmaps that are used?

Are these defined globally? Counterintuitive, but works well for Android Apps.

Do you reuse bitmap definitions or define lots of them? Once they're on a Canvas you can reuse.

 

[pantaraf]

I've commented out that Sub and so far the errors are gone. Of course my sub is absolutely bad.
I guess that using a new canvas for each call leads to memory wasting.
Is there a better method to make text fit views on different devices?

 

[eps]

You could define the Canvas globally and then only initialise if it isn't already initialised..

 

[klaus]

You can do simething like this:
- declare this once in Activity_Create

Dim bmp As Bitmap
bmp.InitializeMutable(2dip, 2dip)
cvsDummy.Initialize2(bmp)

- and in the ScaleText routine:

testo = cvsDummy.MeasureStringWidth(btn.text,Typeface.SANS_SERIF,fontsize)

 

[pantaraf]

Thank you everyone. I'm gonna try these hints. I'll be back for a follow up.

Thanks!
Raffaele

 

[Erel]

klaus suggestion will fix this issue.

 

[pantaraf]

The problem seems to be solved so far.

I've declared

Private cvsdummy As Canvas
Private bmp As Bitmap

in Globals

In Activity_Create:

If(bmp.IsInitialized=False) Then
  bmp.InitializeMutable(2dip, 2dip)
  cvsdummy.Initialize2(bmp)
End If

This for each activity in my project that needs to call TextScaler.ScaleText.

Thank you for your help.
Raffaele