Immutable bitmap crash error

Question

java.lang.IllegalStateException: Immutable bitmap passed to Canvas constructor
at android.graphics.Canvas.<init>(Canvas.java:127)
at app.test.canvas.StartActivity.applyFrame(StartActivity.java:214)
at app.test.canvas.StartActivity$1.onClick(StartActivity.java:163)
at android.view.View.performClick(View.java:4223)
at android.view.View$PerformClick.run(View.java:17275)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4898)
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:1006)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
at dalvik.system.NativeStart.main(Native Method)

I get this crash error from the developer console .. I don't understand what is the problem ..

    BitmapFactory.Options opt = new BitmapFactory.Options();
    opt.inScaled = true;
    opt.inPurgeable = true;
    opt.inInputShareable = true;
    Bitmap brightBitmap = BitmapFactory.decodeResource(getResources(), position, opt); 
    brightBitmap = Bitmap.createScaledBitmap(brightBitmap, 550, 550, false);
    chosenFrame = brightBitmap;
    Bitmap workingBitmap = Bitmap.createBitmap(chosenFrame);
    workingBitmap = Bitmap.createBitmap(workingBitmap); 
    Canvas c = new Canvas(workingBitmap);

I think it's related to this ?

Answer 1

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 2

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 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