Android Question [Solved] OutOfMemoryError with canvas

[angel_]

On some devices (low range) I have this error.

java.lang.OutOfMemoryError: Failed to allocate a 182088012 byte allocation with 4194304 free bytes and 64MB until OOM
    at dalvik.system.VMRuntime.newNonMovableArray(Native Method)
    at android.graphics.Bitmap.nativeCreate(Native Method)
    at android.graphics.Bitmap.createBitmap(Bitmap.java:812)
    at android.graphics.Bitmap.createBitmap(Bitmap.java:789)
    at android.graphics.Bitmap.createBitmap(Bitmap.java:756)
    at anywheresoftware.b4a.objects.drawable.CanvasWrapper.Initialize(CanvasWrapper.java:81)
    at anywheresoftware.b4a.objects.B4XCanvas.Initialize(B4XCanvas.java:54)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at anywheresoftware.b4a.shell.Shell.runVoidMethod(Shell.java:777)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:354)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:197)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:193)
    at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:80)
    at android.view.View.performClick(View.java:4900)
    at android.view.View$PerformClick.run(View.java:20381)
    at android.os.Handler.handleCallback(Handler.java:815)
    at android.os.Handler.dispatchMessage(Handler.java:104)
    at android.os.Looper.loop(Looper.java:194)
    at android.app.ActivityThread.main(ActivityThread.java:5877)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)

Sub Activity_Create(FirstTime As Boolean)
    Activity.LoadLayout("Layout")
  
    Panel1.Height = 6 * 100%y
    Panel1.Width = 6 * 100%x
End Sub

Sub Button1_Click
    Dim cvsPnl As B4XCanvas
    cvsPnl.Initialize(Panel1)
   'doing something
End Sub

Is there a way to avoid this error?

 

[Erel]

There is no such thing.

 

[agraham]

You might be able to use ScaleImageView. Either the user, or your program without user intervention, could zoom and position your large image and the OnDraw event provides a Canvas object whose Bitmap property you could probably use to get the displayed portion of the image. You could probably not make it visible or hide it off screen if you don't want the user to see it.

I know it's not cross platform but I guess you could do something different in B4J as it JavaFX can probably display much larger images than Android.

Thre's lots of probables because I haven't tried it!

 

[angel_]

In the end, instead of getting the image of the large panel and cropped, I opted to create a new panel with the dimensions of the content (smaller dimensions) of the large panel and then get the image of the latter panel then I delete this panel