canvas - Android custom width adjustable slider -


i'm trying make custom slider, can dragged , width can changed.

i made relative layout view that has frame layout 2 images (left , right) , text in middle. when frame layout dragged animate new position of view. have problem adjust width of view when left or right image dragged. tried changes layout parameter re-centers whole view , doesn't extend dragged side.

xml layout 

<relativelayout     android:id="@+id/test_layout"     android:layout_width="match_parent"     android:layout_height="40dp"     android:background="@color/coloraccent"     android:orientation="horizontal">      <framelayout         android:id="@+id/frame"         android:layout_width="80dp"         android:layout_height="40dp"         android:layout_centerinparent="true"         android:layout_marginbottom="5dp"         android:layout_margintop="5dp"         android:animatelayoutchanges="true"         android:background="@drawable/test_background">           <imageview             android:id="@+id/left"             android:layout_width="10dp"             android:layout_height="match_parent"             android:background="@drawable/test_background" />          <textview             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_gravity="center"             android:clickable="false"             android:text="test"             android:textcolor="#7a1ea1" />          <imageview             android:id="@+id/right"             android:layout_width="10dp"             android:layout_height="match_parent"             android:layout_gravity="right"             android:background="@drawable/test_background" />     </framelayout>  </relativelayout> 

 binding.frame.setontouchlistener(new view.ontouchlistener() {         @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:                      float x = event.getrawx() + dx;                     if (x > binding.testlayout.getright())                         x = binding.testlayout.getright();                     else if (x < binding.testlayout.getleft()) x = binding.testlayout.getleft();                      view.animate()                             .x(x)                             .setduration(0)                             .start();                     break;                 default:                     return false;             }             return true;         }     });

or should rather use canvas this?

example hot slider looks


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