Immutable bitmap crash error

Question

java.lang.IllegalStateException: Immutable bitmap passed to Canvas constructor
at android.graphics.Canvas.(Canvas.java:127)
at app.test.canvas.StartActiv         


        

Answer 1

BitmapFactory.decodeResource() returns an immutable copy of the bitmap and you cannot draw to its canvas. In order to get its canvas, you need to get a mutable copy of the images' bitmap and that can be done with single line code addition.

opt.inMutable = true;

Add that line to your code and it should address the crash.

Answer 2

You have to convert your workingBitmap to Mutable Bitmap for drawing on Canvas. (Note: this method does not help save memory, it will use extra memory)

Bitmap workingBitmap = Bitmap.createBitmap(chosenFrame);
Bitmap mutableBitmap = workingBitmap.copy(Bitmap.Config.ARGB_8888, true);
Canvas canvas = new Canvas(mutableBitmap);

This answer helps don't waste memory Convert immutable bitmap to a mutable bitmap

Answer 3

Unless you don't want to make your IMMUTABLE bitmap to MUTABLE bitmap, you can save memory by ALWAYS REUSING THE BITMAP

workingBitmap = workingBitmap.copy(Bitmap.Config.ARGB_8888, true);
Canvas canvas = new Canvas(workingBitmap);

However I think this may be same as making the bitmap mutable by calling

workingBitmap.isMutable = true

Answer 4

This works as well, I just tested it.

final BitmapFactory.Options options = new BitmapFactory.Options();
options.inMutable = true;
return BitmapFactory.decodeByteArray(resultDecoded, 0, resultDecoded.length,options);

Answer 5

in order to minimize memory usage, you can check out this post about converting/decoding a mutable bitmap straight from the resources :

https://stackoverflow.com/a/16314940/878126