Android:TextView height doesn't change after shrinking the font size

Question

When I click on the button, the font size shrinks to 12. However, the result is :

Answer 1

try calling invalidate() or a variant of invalidate(). From android developer docs:

public void invalidate ()

Since: API Level 1 Invalidate the whole view. If the view is visible, onDraw(android.graphics.Canvas) will be called at some point in the future. This must be called from a UI thread. To call from a non-UI thread, call postInvalidate().

http://developer.android.com/reference/android/view/View.html#invalidate()