OnTouckListener of listview

Question

I am having a listview, I want to detect the touch movement up and down. I am using this code. However, when I touch the listview both UP & DOWN are called. Why? I used log to view up & down movement. What I do with listview are both in log.

This is the code:

lstviewOrders.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View view, MotionEvent motionEvent) {

        int action = motionEvent.getAction();

        switch(action)
        {

            case MotionEvent.ACTION_DOWN:
                Log.w("down:","YES");
                break;
            case MotionEvent.ACTION_UP:
                Log.w("UP:","YES");
                break;
        }
        return false;
    }
});

Answer 1

If you want to check SWIPE_UP and SWIPE_DOWN you have to implement your own OnTouchListener or you can you this one :

OnSwipeTouchListener.java:

import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
public class OnSwipeTouchListener implements OnTouchListener {

    private final GestureDetector gestureDetector = new GestureDetector(new GestureListener());

    public boolean onTouch(final View view, final MotionEvent motionEvent) {

        super.onTouch(view, motionEvent);
        return gestureDetector.onTouchEvent(motionEvent);
}

private final class GestureListener extends SimpleOnGestureListener {

    private static final int SWIPE_THRESHOLD = 100;
    private static final int SWIPE_VELOCITY_THRESHOLD = 100;

    @Override
    public boolean onDown(MotionEvent e) {
        return true;
    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {

        boolean result = false;
        try {
            float diffY = e2.getY() - e1.getY();
            float diffX = e2.getX() - e1.getX();
            if (Math.abs(diffX) > Math.abs(diffY)) {
                if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
                    if (diffX > 0) {
                        onSwipeRight();
                    } else {
                        onSwipeLeft();
                    }
                }
            } else {
                if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
                    if (diffY > 0) {
                        onSwipeBottom();
                    } else {
                        onSwipeTop();
                    }
                }
            }
        } catch (Exception exception) {
            exception.printStackTrace();
        }
        return result;
    }
}
    public void onSwipeRight() {}
    public void onSwipeLeft() {}
    public void onSwipeTop() {}
    public void onSwipeBottom() {}
}

and apply it to your listView like this :

lstviewOrders.setOnTouchListener(new OnSwipeTouchListener() { 

    public void onSwipeTop() { 
        Toast.makeText(MyActivity.this, "top", Toast.LENGTH_SHORT).show();
    } 
    public void onSwipeRight() { 
        Toast.makeText(MyActivity.this, "right", Toast.LENGTH_SHORT).show();
    } 
    public void onSwipeLeft() { 
        Toast.makeText(MyActivity.this, "left", Toast.LENGTH_SHORT).show();
    } 
    public void onSwipeBottom() { 
        Toast.makeText(MyActivity.this, "bottom", Toast.LENGTH_SHORT).show();
    } 

}); 

Answer 2

Look at the documentation of MotionEvent

The ACTION_UP- link - you get when pressed gesture has finished and the ACTION_DOWN - link - you get when a pressed gesture has started. Every time when you make pressed gesture you call both.

The ACTION_UP and ACTION_DOWN are not the same as swipe up and swipe down.