Set rotated drawable as TextView's drawableLeft

Question

I want to rotate drawableLeft in a TextView.

I tried this code:

Drawable result = rotate(degree);
setCompoundDrawables(result, null, null, null);

private Drawable rotate(int degree)
{
    Bitmap iconBitmap = ((BitmapDrawable)originalDrawable).getBitmap();

    Matrix matrix = new Matrix();
    matrix.postRotate(degree);
    Bitmap targetBitmap = Bitmap.createBitmap(iconBitmap, 0, 0, iconBitmap.getWidth(), iconBitmap.getHeight(), matrix, true);

    return new BitmapDrawable(getResources(), targetBitmap);
}

But it gives me a blank space on the left drawable's place.

Actually, even this simplest code gives blank space:

Bitmap iconBitmap = ((BitmapDrawable)originalDrawable).getBitmap();
Drawable result = new BitmapDrawable(getResources(), iconBitmap);
setCompoundDrawables(result, null, null, null);

This one works fine:

 setCompoundDrawables(originalDrawable, null, null, null);

Answer 1

According to the docs , if you want to set drawableLeft you should call setCompoundDrawablesWithIntrinsicBounds (int left, int top, int right, int bottom) . Calling setCompoundDrawables() only works if setBounds() has been called on the Drawable, which is probably why your originalDrawable works.

So change your code to:

Drawable result = rotate(degree);
setCompoundDrawablesWithIntrinsicBounds(result, null, null, null);

Answer 2

You can't just "cast" a Drawable to a BitmapDrawable

To convert a Drawable to a Bitmap you have to "draw" it, like this:

Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap); 
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);

See the post here:

How to convert a Drawable to a Bitmap?