如何使用ViewPropertyAnimator将Width设置为特定值

Question

如何使用ViewPropertyAnimator设置视图宽度？

我可以缩放或翻译(见下文),但我不能设置为特定的宽度.

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

但没有

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

Answer 1

使用简单的动画代替 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; 
    } 
}