A wrapper for animating changes of android:weight property of views inside LinearLayout using ObjectAnimator

ViewWeightAnimationWrapper.java

public class ViewWeightAnimationWrapper {
 private View view;

 public ViewWeightAnimationWrapper(View view) {
  if (view.getLayoutParams() instanceof LinearLayout.LayoutParams) {
   this.view = view;
  } else {
   throw new IllegalArgumentException("The view should have LinearLayout as parent");
  }
 }

 public void setWeight(float weight) {
  LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) view.getLayoutParams();
  params.weight = weight;
  view.setLayoutParams(params);
 }

 public float getWeight() {
  return ((LinearLayout.LayoutParams) view.getLayoutParams()).weight;
 }
}

// code sample
ObjectAnimator.ofFloat(new ViewWeightAnimationWrapper(view), "weight", oldWeight, newWeight).start();