ontouchlistener - Slide Up an image using EventMotion in Android -

i trying slide layout in android using touch listener. expecting motion_up should intercepted when user touches screen , drags finger screen. , motion_down other way. when debug, both , down called.

i trying slide layout when drag using animation. don't understand doing wrong. did had situation before? hints helpful, thank you.

this code:

@targetapi(build.version_codes.honeycomb) public class mainactivity extends activity implements animationlistener,         ondraglistener {      // animation     private animation animslideup;     private imageview img;     private rect rect;      @targetapi(build.version_codes.honeycomb)     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          img = (imageview) findviewbyid(r.id.interstitialimg);         img.setondraglistener(this);         img.setontouchlistener(new view.ontouchlistener() {              @override             public boolean ontouch(view v, motionevent event) {                  if (event.getactionmasked() == motionevent.action_up) {                     system.out.println("up");                      rect = new rect(v.getleft(), v.gettop(), v.getright(), v                             .getbottom());                     v.gethitrect(rect);                     if (rect.contains(math.round(v.getx() + event.getx()),                             math.round(v.gety() + event.gety()))) {                         system.out.println("inside");                         // animation slide_up = animationutils.loadanimation(                         // getapplicationcontext(), r.anim.slide_up);                         // img.startanimation(slide_up);                     } else {                         // outside                         system.out.println("outside");                     }                 }                 if (event.getaction() == motionevent.action_down) {                     system.out.println("down");                     // construct rect of view's bounds                     rect = new rect(v.getleft(), v.gettop(), v.getright(), v                             .getbottom());                     return true;                 }                 if (event.getaction() == motionevent.action_move) {                     // if (!rect.contains(v.getleft() + (int) event.getx(),                     // v.gettop() + (int) event.gety())) {                     // // user moved outside bounds                     // system.out.println("moved outside bounds " + rect);                     // }                 }                 return true;             }         });     }      @override     public void onanimationend(animation animation) {         // check zoom in animation         if (animation == animslideup) {             system.out.println("animation: " + animation);             overridependingtransition(r.anim.slide_up, r.anim.slide_up);             finish();         }      }      @override     public void onanimationrepeat(animation animation) {         // todo auto-generated method stub      }      @override     public void onanimationstart(animation animation) {         // todo auto-generated method stub     }      @suppresslint("newapi")     @override     public boolean ondrag(view v, dragevent e) {         if (e.getaction() == dragevent.action_drop) {             system.out.println("action drop");             view view = (view) e.getlocalstate();             viewgroup = (viewgroup) view.getparent();             from.removeview(view);             relativelayout = (relativelayout) v;             to.addview(view);             view.setvisibility(view.visible);         }         return true;     }      @override     public void onbackpressed() {         super.onbackpressed();         overridependingtransition(r.anim.slide_up, r.anim.slide_up);     } } 

i expecting motion_up should intercepted when user touches screen , drags finger screen.

uh, no.

docs rescue:

public static final int action_down pressed gesture has started, motion contains initial starting location.

think of action_down start of user interaction. down not indicate direction. in crude sense, tells user has put his/her finger(s) down on screen.

similarly:

public static final int action_up pressed gesture has finished, motion contains final release location intermediate points since last down or move event.

again, up not you're assuming be. means user has lifted his/her finger(s) off screen.

let's @ code now:

rect = new rect(v.getleft(), v.gettop(), v.getright(), v                         .getbottom()); v.gethitrect(rect); if (rect.contains(math.round(v.getx() + event.getx()),                         math.round(v.gety() + event.gety()))) {     system.out.println("inside");     // animation slide_up = animationutils.loadanimation(     // getapplicationcontext(), r.anim.slide_up);     // img.startanimation(slide_up); } else {     // outside     system.out.println("outside"); } 

first, gethitrect(rect) fills rect supply argument. so, initializing v.getleft(), v.gettop(), v.getright(), v.getbottom() not required.

second, since setting ontouchlistener on img, why need check if event.getx() , event.gety() inside view's bounds? in fact, don't. because, ontouch(...) will not triggered if user touches outside.

third, may not need implement ontouchlistener want.. or @ least, not in way are. example, if looking if user has flinged view or down, can rely on simpleongesturelistener. accepted answer on question show how use it: android: how handle right left swipe gestures.

so these action_down , action_up events used for? well, work them when need finer control: reacting user input immediately. example, cannot afford basic functionality of moving view around screen using simpleongesturelistener.