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

Finally, I found the reason/solution!!!

This is a known bug for Android 3.1+

Issue 17343

Issue 22493

Possible workaround are:

text.setText(text+"\n");

or

final String DOUBLE_BYTE_SPACE = "\u3000";
text.setText(text + DOUBLE_BYTE_SPACE);