public FPSTextureView addChildAt(int location,@NonNull DisplayBase displayBase){
  displayBase.setUp(mFps);
  mDisplayList.add(location,displayBase);
  return this;
}

public FPSTextureView addChildAt ( int location , @ NonNull DisplayBase displayBase ) { displayBase . setUp ( mFps ) ; mDisplayList . add ( location , displayBase ) ; return this ; }
adds a child to the display list at the specified index , bumping children at equal or greater indexes up one , and setting its parent to this container
