从上到下翻译图像

Question

图片上下到下的动画：

我正在使用以下代码为图像设置动画，同时它适用于从右到左的动画我想做同样的从上到下，如何改进这个？

ai=new AccelerateInterpolator();
        TranslateAnimation ifr=new TranslateAnimation(Animation.RELATIVE_TO_SELF,0.04f,Animation.RELATIVE_TO_SELF,0.0f,Animation.RELATIVE_TO_SELF,0.0f,Animation.RELATIVE_TO_SELF,0.0f);
        ifr.setDuration(400);
        ifr.setInterpolator(ai);

        set = new AnimationSet(false); 
        set.addAnimation(ifr);

        AlphaAnimation alphain=new AlphaAnimation(0.0f,1.0f);
        alphain.setDuration(2500);
        set.addAnimation(alphain);

我试过的时候：

ai=new AccelerateInterpolator();
        TranslateAnimation ifr=new TranslateAnimation(Animation.RELATIVE_TO_SELF,0.0f,Animation.RELATIVE_TO_SELF,0.0f,Animation.RELATIVE_TO_SELF,0.0f,Animation.RELATIVE_TO_SELF,0.02f);
        ifr.setDuration(400);
        ifr.setInterpolator(ai);

        set = new AnimationSet(false); 
        set.addAnimation(ifr);

        AlphaAnimation alphain=new AlphaAnimation(0.0f,1.0f);
        alphain.setDuration(2500);
        set.addAnimation(alphain);

但是图像在最后闪烁，即图像逐渐下降但随后又跳回到原始位置

我想要的是图像来自原始位置的2px然后稳定下来。