How to destroy a drawable inside an ImageView if we don't need it?

Question

This question is related with Do we have to explicitly recycle the bitmap if we don't need it?.

There is an ImageView have a drawable, when user clicks a button, it will assign a new drawable to the ImageView.

Do we have to destroy the old drawable belongs to the ImageView, and how?

Drawable oriDrawable = imageView.getDrawable()

// set callback to null
oriDrawable.setCallback(null);

// get the bitmap and recycle it
((BitmapDrawable)oriDrawable).getBitmap().recycle();

Is the code above correct? What's the best solution?

Answer 1

You could try using something like:

Drawable drawable = imageView.getDrawable();
if (drawable instanceof BitmapDrawable) {
    BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
    Bitmap bitmap = bitmapDrawable.getBitmap();
    bitmap.recycle();
}

Where imageView is your ImageView.

Original answer here.