android - How to know when one moving view (overlaps) is on the top of the over -

(not sure title. please make right)

hi. i'm trying create small game, player can move objects inside ralativelayout. want check whether moving object inside framelayout or outside of it. example want change text of object when inside framelayout.

so create objects inside for loop way:

random random = new random(); (int = 0; < 3; i++) {  //any number, not 3             textview textview = new textview(getactivity());             textview.setx(random.nextint(size.x - 200));             textview.sety(random.nextint(size.y - 200)); //scattered on screen             textview.settext(i + "");             textview.setbackgroundcolor(getresources().getcolor(r.color.colorprimary));             textview.settextsize(50);             relativelayout.layoutparams lp = new relativelayout.layoutparams(                     relativelayout.layoutparams.wrap_content,                     relativelayout.layoutparams.wrap_content);             textview.setlayoutparams(lp);             textview.setontouchlistener(touchlistener);             framefor.addview(textview);         } 

there framelayout objects should be:

relativelayout.layoutparams framelp = new relativelayout.layoutparams(300, 300);         framelp.addrule(relativelayout.center_in_parent, relativelayout.true);         frameforletters.setlayoutparams(framelp); 

as can see, added ontouchlistener make objects movable:

view.ontouchlistener touchlistener = new view.ontouchlistener() {         float dx, dy;          @override         public boolean ontouch(view view, motionevent event) {             switch (event.getaction()) {                  case motionevent.action_down:                      dx = view.getx() - event.getrawx();                     dy = view.gety() - event.getrawy();                     break;                  case motionevent.action_move:                      view.animate()                             .x(event.getrawx() + dx)                             .y(event.getrawy() + dy)                             .setduration(0)                             .start();                     break;                 default:                     return false;             }             return true;         }     }; 

in pic can see one , two inside framelayout , 0 outside.

i know can done huge amount of geometry , calculation size of each object , framelayout itself. maybe there way of doing this? maybe there library or framework can make task easier?

i'm not aware of libraries or frameworks, can use these 2 methods determine if objects overlapping (the rect.intersects method of calculations):

private rect getscreenbounds(view view) {     int[] location = new int[2];     view.getlocationonscreen(location);      return new rect(location[0], location[1], location[0] + view.getwidth(), location[1] + view.getheight()); }  private boolean doviewsintersect(view target, view item) {     rect targetrect = getscreenbounds(target);     rect itemrect = getscreenbounds(item);      return targetrect.intersects(itemrect); } 

if you're interested in knowing if object inside other, targetrect becomes rect containing intersection. hence, can following see if item entirely inside target bounds:

if(targetrect.intersects(itemrect)) {     return targetrect.width() == item.getwidth() && targetrect.height() == item.getheight(); } else {     return false; }