Question

I am trying to create a bitmap out of a relative layout that i have created programmatically.
The Realtivelayout is showing as expected but when i try to create a bitmap , it returns illegal argument exception that height and width must be > 0
this is how i am doing it

Bitmap.createBitmap(saveLayout.getWidth(),
            saveLayout.getHeight(), Bitmap.Config.ARGB_8888);

Any pointers?

Edit: added this code, too:

    ViewTreeObserver viewTreeObserver = saveLayout.getViewTreeObserver();
    if (viewTreeObserver.isAlive()) {
        viewTreeObserver
                .addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
                    @Override
                    public void onGlobalLayout() {
                        saveLayout.getViewTreeObserver()
                                .removeGlobalOnLayoutListener(this);
                        viewWidth = saveLayout.getWidth();
                        viewHeight = saveLayout.getHeight();

                    }
                });
    }

In above given code onGlobalLayout() also never seemed to be called.

Answer 1

If you’re programmatically creating the saveLayout, you may be asking for its width and height too early. (just an educated guess, because I can’t see the rest of your code)

See this explanation

The reason why that createBitmap() call throws that exception is:

if the width or height are <= 0

So, try to defer creating the Bitmap until after the view appears, or find another way to calculate the width/height.

This question has a few options/answers for how to defer this calculation to avoid 0 results