ListView、GridView加载条目动画初体验

1、Android本身ListView和GridView加载每个Item时默认是没有动画的，这就给用户一种不好的体验，下面我就做了一些简单的补间动画。

/**
* ListView条目加载动画
* @return
*/
public LayoutAnimationController getLVAnimationController() {
int duration = 100;
AnimationSet animSet = new AnimationSet(true);

Animation alphaAnim = new AlphaAnimation(0.0f, 1.0f); // 透明度改变
alphaAnim.setDuration(duration); // 动画时间
animSet.addAnimation(alphaAnim);

Animation transAnim = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 1.0f, Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f); // 位移动画
transAnim.setDuration(duration);
animSet.addAnimation(transAnim);

LayoutAnimationController lac = new LayoutAnimationController(animSet, 1.0f);
lac.setOrder(LayoutAnimationController.ORDER_NORMAL); // 动画顺序
return lac;
}

/**
* GridView条目加载动画
* @return
*/
public LayoutAnimationController getGVAnimationController() {
int duration = 50;
AnimationSet animSet = new AnimationSet(true);

Animation alphaAnim = new AlphaAnimation(0.0f, 1.0f);
alphaAnim.setDuration(duration);
animSet.addAnimation(alphaAnim);

Animation transAnim = new ScaleAnimation(0.0f, 1.0f, 0.0f, 1.0f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); // 伸缩动画
transAnim.setDuration(duration);
animSet.addAnimation(transAnim);

LayoutAnimationController lac = new LayoutAnimationController(animSet, 0.5f);
lac.setOrder(LayoutAnimationController.ORDER_NORMAL);
return lac;
}

2、ListView和GridView有一个LayoutAnimation的属性，所以我们就可以为它们设置动画了。

mListView.setLayoutAnimation(getLVAnimationController());

mGridView.setLayoutAnimation(getGVAnimationController());

3、完成！当然这只是一些普通简单的动画。