android - i am working on media player i want to chnage the brightness of the screen when user slide on the left sideof the screen -


i use following code detect side user slide user not working @ suppose work 

    relay.setontouchlistener(new view.ontouchlistener() {         @override         public boolean ontouch(view v, motionevent touchevent) {             switch (touchevent.getaction())             {                 // when user first touches screen x , y coordinate                 case motionevent.action_down:                 {                     x1 = touchevent.getx();                     y1 = touchevent.gety();                     toast.maketext(videoplay.this, x1+""+x2, toast.length_short).show();                     break;                 }                 case motionevent.action_up:                 {                     x2 = touchevent.getx();                     y2 = touchevent.gety();                                               //if left right sweep event on screen                     if (x1 < x2)                     {                         toast.maketext(videoplay.this, "left right swap performed", toast.length_long).show();                     }                      // if right left sweep event on screen                     if (x1 > x2)                     {                         toast.maketext(videoplay.this, "right left swap performed", toast.length_long).show();                     }                      // if down sweep event on screen                     if (y1 < y2)                     {                         toast.maketext(videoplay.this, "up down swap performed", toast.length_long).show();                     }                                               //if down sweep event on screen                     if (y1 > y2)                     {                         toast.maketext(videoplay.this, "down swap performed", toast.length_long).show();                     }                     break;                 }             }             return false;         }             // return super.ontouchevent(event);      });

can me how can detect user has slide on right side of activity in upward or downward direction

use below code in activity

private float startpoint,endpoint; static final int min_swipe_distance = 150;  @override public boolean ontouchevent(motionevent event) {          switch(event.getaction())     {       case motionevent.action_down:           startpoint = event.getx();                                 break;                 case motionevent.action_up:           endpoint = event.getx();           float dx = endpoint- startpoint;           if (math.abs(dx) > min_swipe_distance)           {               //left right swipe           }                                break;         }                 return super.ontouchevent(event);         }

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