动画视图android的高度

Question

嗨,我想动画一个视图的高度在android说每5秒: -

1. 高度从0到5
2. 身高从5到10
3. 身高从10变为3等

我使用下面的代码: -

    public class ShowAnimation extends Animation{
    float finalHeight;
    View imageview;

    public ShowAnimation(View view,float deltaheight){
        this.imageview=view;
        this.finalHeight=deltaheight;
    }

    protected void applyTransformation(float interpolatedtime,Transformation t){
        imageview.getLayoutParams().height=(int)(finalHeight*interpolatedtime);
        imageview.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;
    }
    }

并像这样初始化它: -

Animation anidelta = new ShowAnimation(delta, deltaheight);
anidelta.setDuration(500/* animation time */);
delta.startAnimation(anidelta);

但有了这个我得到以下: -

1. 高度从0到5
2. 高度从0到10
3. 高度从0到3

我希望高度从之前的高度开始动画,而不是每次从0开始.有人可以帮我这里

编辑1: - 我这样做了

Animation anidelta = new ShowAnimation(delta, deltaheight);
anidelta.setDuration(500/* animation time */);
anidelta.setFillAfter(true);
delta.startAnimation(anidelta);

但它仍然从0到新高度动画.

Answer 1

好的,这就是我最终解决它的方法: -

    public class ResizeAnimation extends Animation 
{
   View view;
int startH;
int endH;
int diff;

public ResizeAnimation(View v, int newh)
{
    view = v;
    startH = v.getLayoutParams().height;
    endH = newh;
    diff = endH - startH;
}

@Override
protected void applyTransformation(float interpolatedTime, Transformation t) 
{
    view.getLayoutParams().height = startH + (int)(diff*interpolatedTime);
    view.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;
}}