code: public void setCustomizedLeftView(View view) {
          mLeftReturnImageView.setVisibility(GONE);
          RelativeLayout.LayoutParams lp = makeLayoutParams(view);
          lp.addRule(CENTER_VERTICAL);
          lp.addRule(ALIGN_PARENT_LEFT);
          getLeftViewContainer().addView(view, lp);
      }
docs: set customized view to left side
  
  @param view the view to be added to left side