Set hint on TextInputLayout instead of EditText so that it animates properly when you start typing.

From documentation:
* The hint should be set on the TextInputLayout, rather than the EditText. If a hint is specified
 * on the child EditText in XML, the TextInputLayout might still work correctly; TextInputLayout
 * will use the EditText's hint as its floating label. However, future calls to modify the hint will
 * not update TextInputLayout's hint.