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I have a TextView with the id “tx”. I’ve set an OnTouchListener to allow the user to drag the view.
tx.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent event) {
float x = event.getRawX();
float y = event.getRawY();
if (event.getAction() == MotionEvent.ACTION_MOVE) {
// Offsets center the TextView to the center of the MotionEvent
view.setX(x - view.getWidth() / 2);
view.setY(y - view.getHeight() / 2);
}
return true;
}
How can I create a dragging effect whereby wherever the user initially clicks, that position is the one where the dragging begins? I want fine control (identical to Snapchat or Autodesk Sketch) so if I decide to drag from the left, there is no re-centering. I think this is what most users expect from this kind of interaction. They don’t want their TextView to be re-positioned at the center of where they first clicked.
All help greatly appreciated!
Answer
There will always be an MotionEvent.ACTION_DOWN preceded by MotionEvent.ACTION_MOVE
You should first handle the MotionEvent.ACTION_DOWN event which will give you the position where the user first touched. You can store those coordinates and then use them in the MotionEvent.ACTION_DOWN to do whatever you want to do.