Android 滑动RecyclerView时隐藏部分控件

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在使用RecyclerView控件时,上下拖动控件时的时候,需要实时的隐藏与显示部分控件,已到达很好的用户体验.
原理很简单,当RecyclerView拖动至最上层时显示控件,当RecyclerView.开始向下拖动时,隐藏控件,直接上代码:
定义两个动画:

private AlphaAnimation mShowAnim, mHiddenAmin;//控件的显示和隐藏动画

初始化:

//控件显示的动画
mShowAnim = new AlphaAnimation(0.0f, 1.0f);
mShowAnim.setDuration();//控件隐藏的动画
mHiddenAmin = new AlphaAnimation(1.0f, 0.0f);
mHiddenAmin.setDuration();

RecyclerView控件初始化:

mRecyclerView = (RecyclerView) findViewById(R.id.e_custom_merchandise_activity_recyclerview);
mRecyclerView.addOnScrollListener(new MyRecyclerViewScrollListener());

定义滑动监听事件:

//滑动监听
private class MyRecyclerViewScrollListener extends RecyclerView.OnScrollListener {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
LinearLayoutManager manager = (LinearLayoutManager) recyclerView.getLayoutManager();
int lastVisibleItem = manager.findLastCompletelyVisibleItemPosition();//获取最后一个完全显示的ItemPosition
// 当不滚动时
if (newState == RecyclerView.SCROLL_STATE_IDLE) {
// 判断是否滚动到顶部
if (lastVisibleItem == ) {
mTextViewPersonalise.startAnimation(mShowAnim);
mTextViewPersonalise.setVisibility(View.VISIBLE);
}
} else if (newState == RecyclerView.SCROLL_STATE_DRAGGING ) {//拖动中
if (mTextViewPersonalise.getVisibility() == View.VISIBLE) {
mTextViewPersonalise.startAnimation(mHiddenAmin);
mTextViewPersonalise.setVisibility(View.INVISIBLE);//注意此处不要使用View.GONE
}
}
}
}