I am creating an android app in Java in which I have a lot of <TextView> around the screen, all of them with onTouchListeners defined. They are wrapped in a <ScrollView> because they occupy more space than available in the screen.
My problem is: when I scroll the app, up/down, by touching at the screen and moving my finger up/down, the scroll works as expected but the onTouchListener of the touched <TextView> is also fired (which is probably expected as well) - I don't want that to happen though. I want the onTouchListener to be ignored when I'm touching the screen to scroll it.
How can I accomplish this? I don't want my function to run when the user is scrolling and "accidentally" fires the onTouchListener on a certain <TextView>.
After searching more, I found this solution by Stimsoni. The idea is to check if the time between the ACTION_DOWN and ACTION_UP events is lower or higher than the value given by ViewConfiguration.getTapTimeout().
From the documentation:
[Returns] the duration in milliseconds we will wait to see if a touch event is a tap or a scroll. If the user does not move within this interval, it is considered to be a tap.
Code:
view.setOnTouchListener(new OnTouchListener() {
private long startClickTime;
@Override
public boolean onTouch(View view, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
startClickTime = System.currentTimeMillis();
} else if (event.getAction() == MotionEvent.ACTION_UP) {
if (System.currentTimeMillis() - startClickTime < ViewConfiguration.getTapTimeout()) {
// Touch was a simple tap. Do whatever.
} else {
// Touch was a not a simple tap.
}
}
return true;
}
});