LayoutAnimationController为视图添加动画效果

渐变动画alpha animation和位移动画translate animation 为ListView的子视图添加动画效果。

mListView = (ListView) findViewById(R.id.list_view);
        AnimationSet set = new AnimationSet(true);
        Animation an = new AlphaAnimation(0.0f, 1.0f);
        an.setDuration(1000);
        set.addAnimation(an);
        an = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF,
                0.0f, Animation.RELATIVE_TO_SELF, -1.0f, Animation.RELATIVE_TO_SELF, 0.0f);
        an.setDuration(1000);
        set.addAnimation(an);
        LayoutAnimationController controller = new LayoutAnimationController(set, 0.5f);
        mListView.setLayoutAnimation(controller);
        String[] strs = {"1", "2", "3", "4", "5", "6", "7"};
        ArrayAdapter<String> adapter = new ArrayAdapter<>(this,
                android.R.layout.simple_expandable_list_item_1, strs);
        mListView.setAdapter(adapter);

步骤：

1.获取ListView的引用

2.创建默认动画集合对象

3.创建透明度渐变动画

4.创建位移动画

5.创建LayoutAnimationController对象并设置子视图动画系哦啊过持续时间

6.将LayoutAnimationController对象设置到ListView中

7.ListView设置Adapter