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我有一個RecyclerView,並且我正在填充4個imageView。我的需要是,當第一項是在頂部的可見位置,它必須在阿爾法1和其他項目必須在0.2f阿爾法..根據回收站適配器中的位置在ImgeView上設置Alfa
當我滾動我的回收視圖然後,項目誰來位於頂端,它應該是設置爲阿爾法1.我做什麼..
我的適配器
@Override
public void onBindViewHolder(PageCircleIndiAdapter.ViewHolder holder, int position) {
final PageModels pageModels = pageList.get(position);
if (pageList.get(position) != null) {
holder.imageView.setImageResource(pageModels.resourceId);
}
if (position == 0) {
holder.rlyt.setAlpha(1f);
pageCircleIndicator.changeIndicator(position);
}
else if (position >firstVisible && position<lastVisible) {
holder.rlyt.setAlpha(1f);
pageCircleIndicator.changeIndicator(position);
} else if(position==pageList.size()-1){
holder.rlyt.setAlpha(1f);
pageCircleIndicator.changeIndicator(position);
}
else {
holder.rlyt.setAlpha(0.2f);
pageCircleIndicator.changeIndicator(position);
}
}
**我的MainActivity滾動監聽器**
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
LinearLayoutManager manager = (LinearLayoutManager) recyclerView.getLayoutManager();
int firstVisible = manager.findFirstVisibleItemPosition();
int lastVisible = manager.findLastVisibleItemPosition();
Log.i("TAG", "onScrolled: " + firstVisible);
Log.i("TAG", "Last Index: " + lastVisible);
pageAdapter.changeItem(firstVisible, lastVisible);
}
});
createIndicator();
pageAdapter.notifyDataSetChanged();
}
Thanxx太多了..完美 –