boolean stop;
float x1,x2;
float y1, y2;

public void  ImageLoopForward(){
        final Handler handler = new Handler();
        runnable = new Runnable() {
            int i = a;

            public void run() {
                    imageView.setImageResource(imageArray[i]);
                    i++;
                    if(stop==true)return;
                    a = i;
                    if (i > imageArray.length - 1) {
                        i = 0;
                    }
                    handler.post(this);
            }
        };
        handler.post(runnable);
    }

    public void  ImageLoopBack(){
        final Handler handler = new Handler();
        runnable = new Runnable() {
            int i = a;

            public void run() {
                imageView.setImageResource(imageArray[i]);
                i--;
                if(stop==true)return;
                a = i;
                if (i == 0) {
                    i = imageArray.length-1;
                }

                handler.post(this);
            }
        };
        handler.post(runnable);
    }

public boolean onTouchEvent(MotionEvent touchevent)
    {
        switch (touchevent.getAction()) {
            // when user first touches the screen we get x and y coordinate
            case MotionEvent.ACTION_DOWN: {
                x1 = touchevent.getX();
                y1 = touchevent.getY();
            }
            case MotionEvent.ACTION_MOVE: {
                x2 = touchevent.getX();
                y2 = touchevent.getY();
                //if left to right sweep event on screen
                if (x1 < x2) {
                    ImageLoopForward();
                }
                // if right to left sweep event on screen
                if (x1 > x2) {
                    ImageLoopBack();
                }
            }
            case MotionEvent.ACTION_UP:{
                stop = true;
            }
        }
        return false;
    }