android - Restrict dynamically added views from overlapping each other in relative layout -

i have relativelayout consisting button

this button add text views cand dragged , dropped when clicked

my problem how prevent these textvies overlapping each other when dragged , dropped on 1 another

dynamic adding , dragging of textviews said looks this

my main activity

public class mainactivity extends activity  {    relativelayout droplayoutnew;  button addtext;  @override protected void oncreate(bundle savedinstancestate) {      super.oncreate(savedinstancestate);     setcontentview(r.layout.main);       droplayoutnew = (relativelayout) findviewbyid(r.id.edtxtlayout);         droplayoutnew.setondraglistener(new mydraglistener());     addtext = (button) findviewbyid(r.id.mainbutton1);     addtext.setonclicklistener(new mybuttonclicklistener());      }  } 

my clicklistener

public class mybuttonclicklistener implements onclicklistener  {  @override public void onclick(view v) {     viewgroup relativeparent = (viewgroup) v.getparent();     customedittext edttxt = new customedittext(v.getcontext());     relativeparent.addview(edttxt);     edttxt.setonlongclicklistener(new mylongclicklistener());  }    } 

** mylongclicklistner **

public class mylongclicklistner implements onlongclicklistener  {  @override public boolean onlongclick(view v) {      clipdata dragdata = clipdata.newplaintext("","");      view.dragshadowbuilder shdwbldr = new view.dragshadowbuilder(v);      v.startdrag(dragdata, shdwbldr, v, 0);     v.setvisibility(view.invisible);      return true; }     } 

my draglistener

public class mydraglistener implements ondraglistener  {  private layoutparams params;  @override public boolean ondrag(view v, dragevent event) {     view view = (view) event.getlocalstate();       switch(event.getaction())     {         case dragevent.action_drag_started:              params = (relativelayout.layoutparams) view.getlayoutparams();               break;          case dragevent.action_drag_entered:             int x = (int) event.getx();             int y = (int) event.gety();              break;          case dragevent.action_drag_exited :              break;          case dragevent.action_drag_location  :             x=  (int) event.getx();             y =  (int) event.gety();             break;          case dragevent.action_drag_ended   :              break;          case dragevent.action_drop:              x = (int) event.getx();             y = (int) event.gety();             params.leftmargin = x;             params.topmargin = y;              view.setlayoutparams(params);             view.setvisibility(view.visible);              break;         default: break;     }     return true; }    } 

mybuttonclicklistener

public class mybuttonclicklistener implements onclicklistener {  @override public void onclick(view v) {     viewgroup relativeparent = (viewgroup) v.getparent();       textview txt = new textview(v.getcontext());     relativeparent.addview(txt);       txt.settext("drag me");     txt.setonlongclicklistener(new mylongclicklistner());  }  } 

my layout

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#cdc2c0" android:id="@+id/ondraglayout">  <button     android:layout_height="wrap_content"     android:text="t"     android:layout_width="wrap_content"     android:layout_alignparentbottom="true"     android:layout_alignparentright="true"     android:id="@+id/mainbutton1"/>  <relativelayout     android:layout_height="match_parent"     android:layout_width="match_parent"     android:layout_above="@id/xvalue"     android:background="#e1a29d"     android:id="@+id/edtxtlayout"/>