android - How can an image does not go over another to be dragged or moved? -

i have code can move multiple images mouse drag image passes on other. want move without going over. know how do? image can not spend 1 another.

     package br.com.example.teste8;       import android.app.activity;      import android.os.bundle;      import android.view.motionevent;      import android.view.view;      import android.view.viewgroup;      import android.widget.imageview;      import android.widget.relativelayout;       public class mainactivity extends activity implements view.ontouchlistener {  private imageview mimageview;  private viewgroup mrrootlayout;  private int _xdelta; private int _ydelta;  relativelayout.layoutparams layoutparams;  @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);     mrrootlayout = (viewgroup) findviewbyid(r.id.marco);      mimageview = (imageview) mrrootlayout.findviewbyid(r.id.imageview);      relativelayout.layoutparams layoutparams = new relativelayout.layoutparams(50,50);     layoutparams.leftmargin = 0;     layoutparams.topmargin = 10;      mimageview.bringtofront();     mimageview.setlayoutparams(layoutparams);     mimageview.setontouchlistener(this);       mimageview = (imageview) mrrootlayout.findviewbyid(r.id.imageview2);      relativelayout.layoutparams layoutparams1 = new relativelayout.layoutparams(50,50);     layoutparams1.leftmargin = 50;     layoutparams1.topmargin = 10;      mimageview.setlayoutparams(layoutparams1);     mimageview.setontouchlistener(this);       mimageview = (imageview) mrrootlayout.findviewbyid(r.id.imageview3);      relativelayout.layoutparams layoutparams2 = new relativelayout.layoutparams(50,50);     layoutparams2.leftmargin = 100;     layoutparams2.topmargin = 10;      mimageview.setlayoutparams(layoutparams2);     mimageview.setontouchlistener(this);  }   public boolean ontouch(view view, motionevent event) {     final int x = (int) event.getrawx();     final int y = (int) event.getrawy();     switch (event.getaction() & motionevent.action_mask) {      case motionevent.action_up:         break;      case motionevent.action_move:         relativelayout.layoutparams layoutparams = (relativelayout.layoutparams) view.getlayoutparams();          layoutparams.leftmargin = x - _xdelta;         layoutparams.topmargin = y - _ydelta;         layoutparams.rightmargin = -50;         layoutparams.bottommargin = -50;         view.setlayoutparams(layoutparams);         break;     }     mrrootlayout.invalidate();     return true; } } 

xml:

 <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/marco"  android:layout_width="fill_parent"  android:layout_height="fill_parent" android:orientation="horizontal" android:clickable="true">    <textview  android:id="@+id/txt"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:text="@string/hello_world"  android:gravity="top" />   <imageview   android:id="@+id/imageview" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/border" android:contentdescription="@null" android:src="@drawable/ic_launcher" />  <imageview android:id="@+id/imageview2" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/border" android:contentdescription="@null" android:src="@drawable/ic_launcher" />  <imageview  android:id="@+id/imageview3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginleft="48dp" android:background="@drawable/border" android:contentdescription="@null" android:src="@drawable/ic_launcher" />  </relativelayout> 

you didn't if images overlapped. suppose images block each other, need nothing while moving cause overlapping. modified following codes:

package br.com.example.teste8;  import android.app.activity; import android.os.bundle; import android.view.motionevent; import android.view.view; import android.view.viewgroup; import android.widget.imageview; import android.widget.relativelayout;  public class mainactivity extends activity implements view.ontouchlistener {      private imageview mimageview;     private imageview mimages[] = new imageview[3];      private viewgroup mrrootlayout;      private int _xdelta;     private int _ydelta;      relativelayout.layoutparams layoutparams;      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         mrrootlayout = (viewgroup) findviewbyid(r.id.marco);          mimageview = (imageview) mrrootlayout.findviewbyid(r.id.imageview);          relativelayout.layoutparams layoutparams = new relativelayout.layoutparams(                 50, 50);         layoutparams.leftmargin = 0;         layoutparams.topmargin = 10;          mimageview.bringtofront();         mimageview.setlayoutparams(layoutparams);         mimageview.setontouchlistener(this);         mimages[0] = mimageview;          mimageview = (imageview) mrrootlayout.findviewbyid(r.id.imageview2);          relativelayout.layoutparams layoutparams1 = new relativelayout.layoutparams(                 50, 50);         layoutparams1.leftmargin = 50;         layoutparams1.topmargin = 10;          mimageview.setlayoutparams(layoutparams1);         mimageview.setontouchlistener(this);         mimages[1] = mimageview;          mimageview = (imageview) mrrootlayout.findviewbyid(r.id.imageview3);          relativelayout.layoutparams layoutparams2 = new relativelayout.layoutparams(                 50, 50);         layoutparams2.leftmargin = 100;         layoutparams2.topmargin = 10;          mimageview.setlayoutparams(layoutparams2);         mimageview.setontouchlistener(this);         mimages[2] = mimageview;      }      public boolean ontouch(view view, motionevent event) {         final int x = (int) event.getrawx();         final int y = (int) event.getrawy();         switch (event.getaction() & motionevent.action_mask) {          case motionevent.action_up:             break;          case motionevent.action_move:             int left = x - _xdelta;             int top = y - _ydelta;              boolean overlapped = false;             for(int i=0; i<mimages.length; i++ )             {                 if( view == mimages[i] ) {                     continue;                 }                 relativelayout.layoutparams lp = (relativelayout.layoutparams) mimages[i]                         .getlayoutparams();                 if( left >= lp.leftmargin - lp.width &&                     left <= lp.leftmargin + lp.width &&                     top >= lp.topmargin - lp.height &&                     top <= lp.topmargin + lp.height                 )                 {                     overlapped = true;                     break;                 }             }              if( overlapped == false ) {                 relativelayout.layoutparams layoutparams = (relativelayout.layoutparams) view                         .getlayoutparams();                 layoutparams.leftmargin = x - _xdelta;                 layoutparams.topmargin = y - _ydelta;                 layoutparams.rightmargin = -50;                 layoutparams.bottommargin = -50;                 view.setlayoutparams(layoutparams);             }             break;         }         mrrootlayout.invalidate();         return true;     } }