android - how to limit number of drag and drops -

1. how retrieve id of drop target (button choicedraglistener() class called)
2. how can specify drag , drop limit ,i.e. how many times "drag , drop" can done

this code

design activity_main.xml

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingbottom="@dimen/activity_vertical_margin" android:paddingleft="@dimen/activity_horizontal_margin" android:paddingright="@dimen/activity_horizontal_margin" android:background="@drawable/g" android:paddingtop="@dimen/activity_vertical_margin" android:orientation="vertical" tools:context=".mainactivity" >  <textview     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="@string/hello_world" />    <tablelayout       android:id="@+id/table"      android:paddingtop="50dp"     android:layout_width="wrap_content"                android:layout_height="wrap_content">       <tablerow >         <button android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:id="@+id/b1"                      android:layout_margin="5dp"           android:background="@android:color/transparent"           android:textsize="26sp"                 android:text="a"/>          <button android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:id="@+id/b2"                      android:layout_margin="5dp"           android:background="@android:color/transparent"           android:textsize="26sp"                 android:text="b"/>           </tablerow>          <tablerow >         <button android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:id="@+id/b3"                      android:layout_margin="5dp"           android:background="@android:color/transparent"           android:textsize="26sp"                android:text="1"/>           <button android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:id="@+id/b4"                      android:layout_margin="5dp"           android:background="@android:color/transparent"           android:textsize="26sp"                 android:text="2"/>          </tablerow> <tablerow >           <button android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:id="@+id/b5"                      android:layout_margin="5dp"           android:background="@android:color/transparent"           android:textsize="26sp"                 android:text="a"/>           <button android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:id="@+id/b6"                      android:layout_margin="5dp"           android:background="@android:color/transparent"           android:textsize="26sp"                 android:text="b"/>          </tablerow> </tablelayout> 

mainactivity.java

          package com.example.in;                    import android.os.build;                   import android.os.bundle;              import android.annotation.suppresslint;            import android.annotation.targetapi;         import android.app.activity;           import android.content.clipdata;            import android.graphics.color;       import android.graphics.typeface;        import android.view.dragevent;          import android.view.menu;         import android.view.motionevent;          import android.view.view;         import android.view.view.dragshadowbuilder;         import android.view.view.ondraglistener;        import android.view.view.ontouchlistener;         import android.widget.button;       import android.widget.textview;      import android.widget.toast;    public class mainactivity extends activity { button b1,b2,b3,b4,b5,b6;  @targetapi(build.version_codes.honeycomb) @suppresslint("newapi") @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     final string btn_tag ="button";     setcontentview(r.layout.activity_main);         button b1=(button) findviewbyid(r.id.b1);      button b2=(button) findviewbyid(r.id.b2);      button b3=(button) findviewbyid(r.id.b3);      button b4=(button) findviewbyid(r.id.b4);      button b5=(button) findviewbyid(r.id.b5);      button b6=(button) findviewbyid(r.id.b6);       //b1.settag(btn_tag);       b1.setontouchlistener(new choicetouchlistener());     b2.setontouchlistener(new choicetouchlistener());     b3.setontouchlistener(new choicetouchlistener());       b4.setondraglistener(new choicedraglistener());     b5.setondraglistener(new choicedraglistener());     b6.setondraglistener(new choicedraglistener());  } @suppresswarnings("unused") private final class choicetouchlistener implements ontouchlistener {     @suppresslint("newapi")     @override     public boolean ontouch(view view, motionevent motionevent) {         if (motionevent.getaction() == motionevent.action_down) {              clipdata data = clipdata.newplaintext("", "");             dragshadowbuilder shadowbuilder = new view.dragshadowbuilder(view);              view.startdrag(data, shadowbuilder, view, 0);             return true;         } else {             return false;         }     } }   @suppresslint("newapi") private class choicedraglistener implements ondraglistener {      @override     public boolean ondrag(view v, dragevent event) {         switch (event.getaction()) {         case dragevent.action_drag_started:              break;         case dragevent.action_drag_entered:               break;         case dragevent.action_drag_exited:                  //no action necessary             break;         case dragevent.action_drop:               view view = (view) event.getlocalstate();              button droptarget = (button) v;              button dropped = (button) view;             droptarget.settext(droptarget.gettext().tostring() + dropped.gettext().tostring());         case dragevent.action_drag_ended:             //no action necessary             break;         default:             break;         }         return true;     } }   @override public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.main, menu);     return true; } 

}

1. you can use local count variable count of number times drag , drop happen.
2. you can id of drag , dropped view using v.getid(); in switch case statements...