Linear layout clickable error -


in andoid app. have clickable linear layout i've generated programmaticly, , want turn green when pressed indicate clickable, button would. how go doing this?

this code implemented in header layout. 

<linearlayout     android:id="@+id/back_lay"     android:layout_width="46dp"     android:layout_height="46dp"     android:layout_marginleft="10dp"     android:background="@android:color/transparent"     android:gravity="center_vertical|center_horizontal" >          <button         android:id="@+id/ib_back_music"         android:layout_width="30dp"         android:layout_height="32dp"         android:layout_marginleft="5dp"         android:background="@drawable/back_btn_sel"         android:clickable="true"         android:gravity="center_vertical|center_horizontal|center" />     </linearlayout> 

private linearlayout llinearlayout;  //oncreate llinearlayout = (linearlayout) findviewbyid(r.id.back_lay); llinearlayout.setonclicklistener(new  {          @override         public void onclick(view v)         {            llinearlayout.setbackgroundcolor(color.black);         }  });

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