Jak można użyć ViewPropertyAnimator, aby ustawić szerokość na konkretną wartość?

Question

Jak używać ViewPropertyAnimator do ustawiania szerokości widoku?

Potrafię skalować lub tłumaczyć (patrz poniżej), ale nie mogę ustawić określonej szerokości.

frame_1.animate().scaleX(5).scaleY(5).start(); 

ale nie ma

frame_1.animate().width(1024).height(768).start(); 

Answer 1

używać prostych animacji zamiast ViewPropertyAnimator

public class ResizeWidthAnimation extends Animation 
{ 
    private int mWidth; 
    private int mStartWidth; 
    private View mView; 

public ResizeWidthAnimation(View view, int width) 
{ 
    mView = view; 
    mWidth = width; 
    mStartWidth = view.getWidth(); 
} 

@Override 
protected void applyTransformation(float interpolatedTime, Transformation t) 
{ 
    int newWidth = mStartWidth + (int) ((mWidth - mStartWidth) * interpolatedTime); 

    mView.getLayoutParams().width = newWidth; 
    mView.requestLayout(); 
} 

@Override 
public void initialize(int width, int height, int parentWidth, int parentHeight) 
{ 
    super.initialize(width, height, parentWidth, parentHeight); 
} 

@Override 
public boolean willChangeBounds() 
{ 
    return true; 
} 

}

Answer 2

Spróbuj tego, wsparcie nawet z Androidem 2.3:

ValueAnimatorCompat exitAnimator = AnimatorCompatHelper.emptyValueAnimator(); 
    exitAnimator.setDuration(TransitCompat.ANIM_DURATION * 4); 
    exitAnimator.addUpdateListener(new AnimatorUpdateListenerCompat() { 
     private float oldWidth = view.getWidth(); 
     private float endWidth = 0; 
     private float oldHeight = view.getHeight(); 
     private float endHeight = 0; 
     private Interpolator interpolator2 = new BakedBezierInterpolator();//Any other will be also O.K. 

     @Override 
     public void onAnimationUpdate(ValueAnimatorCompat animation) { 
      float fraction = interpolator2.getInterpolation(animation.getAnimatedFraction()); 

      float width = oldWidth + (fraction * (endWidth - oldWidth)); 
      mTarget.get().getLayoutParams().width = (int) width; 

      float height = oldHeight + (fraction * (endHeight - oldHeight)); 
      view.getLayoutParams().height = (int) height; 


      view.requestLayout(); 
     } 
    }); 

    exitAnimator.start();