Can I set some message to appear like a "tooltip" for a TextView or Button?
There's no concept of "hovering" in a touch screen, but you could set a LongClickListener for your View, and have a Toast appear after a long press. Something like this:
Toast viewToast = Toast.makeText(this, "My View Tooltip", Toast.LENGTH_SHORT);
View myView = (View)findViewById(R.id.my_view);
myView.setOnLongClickListener(new OnLongClickListener() {
@Override
public void onLongClick(View v) {
viewToast.show();
}
});
EDIT: After reading your comment, you should just use the hint
attribute in your EditText XML layout:
<EditText
android:hint="My tip here" />