1. RecyclerView下StaggeredGridLayoutManager基本使用

recyclerView的简单使用在此不多口舌，先初始化StaggeredGridLayoutManager。

@Override

public void InitViewAndData() {

mRecyclerView = f(R.id.rv_attention);

mRefreshLayout = f(R.id.vhrf_attention);

mRecyclerView.setNestedScrollingEnabled(false);

layoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);

layoutManager.setGapStrategy(StaggeredGridLayoutManager.GAP_HANDLING_NONE); //防止瀑布流图片闪烁

mRecyclerView.setLayoutManager(layoutManager);

mRecyclerView.setAdapter(mAdapter);

mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {

@Override

public void onScrollStateChanged(RecyclerView recyclerView, int newState) {

super.onScrollStateChanged(recyclerView, newState);

layoutManager.invalidateSpanAssignments();//防止瀑布流图片闪烁

}

});

}

2. 自定义ViewHolder

recyclerView封装了ViewHolder的回收复用机制，只需要按标准流程实现头部广告位的ViewHolder以及分栏Header条等item的ViewHolder。

public class LiveNoticeVH extends RecyclerView.ViewHolder {

private static final String TAG = "LiveNoticeVH";

private RecyclerView rv_live_notice;

private LiveNoticeAdapter mAdapter;

private TextView tv_header;

private FrameLayout fl_empty_view;

private LinearLayout ll_content_view;

public LiveNoticeVH(View itemView) {

super(itemView);

rv_live_notice = ViewUtils.f(itemView, R.id.rv_live_notice);

tv_header = ViewUtils.f(itemView, R.id.tv_header);

fl_empty_view = ViewUtils.f(itemView, R.id.fl_empty_view);

ll_content_view = ViewUtils.f(itemView, R.id.ll_content_view);

tv_header.setText("关注的直播");

// rv_live_notice.setLayoutManager(new GridLayoutManager(itemView.getContext(),2));

rv_live_notice.setLayoutManager(new LinearLayoutManager(itemView.getContext(), LinearLayoutManager.HORIZONTAL, false));

// rv_live_notice.setNestedScrollingEnabled(false);

mAdapter = new LiveNoticeAdapter(rv_live_notice);

rv_live_notice.setAdapter(mAdapter);

mAdapter.setOnRVItemClickListener(new BGAOnRVItemClickListener() {

@Override

public void onRVItemClick(ViewGroup parent, View itemView, int position) {

try {

SubscriptionInfo item = mAdapter.getItem(position);

if (ICoreManagerBase.getCore(ILivePluginCore.class) != null) {

ICoreManagerBase.getCore(ILivePluginCore.class).getTemplateSelectorInstance().universalToChannel(itemView.getContext(), item.sid, item.ssid, item.liveId, "HomeLiveNoticePush", item.templateId, null);

}

}catch (Exception e){

MLog.info(TAG,"ex="+e);

}

}

});

}

public void setData(List attentionInfoList) {

MLog.info(TAG, "[initData] debug data=" + attentionInfoList);

// MLog.error("LiveNoticeVH","setData size="+attentionInfoList.size());

if (attentionInfoList == null) {

fl_empty_view.setVisibility(View.VISIBLE);

ll_content_view.setVisibility(View.GONE);

} else {

if (attentionInfoList.size() > 0) {

fl_empty_view.setVisibility(View.GONE);

ll_content_view.setVisibility(View.VISIBLE);

// mAdapter.notifyDataSetChanged();

} else {

fl_empty_view.setVisibility(View.VISIBLE);

ll_content_view.setVisibility(View.GONE);

}

}

mAdapter.setData(attentionInfoList);

mAdapter.notifyDataSetChanged();

}

}

3. 构造支持多种item类型的Adapter

从上面的配置我们清楚StaggeredGridLayoutManager显示2列数据，但是Banner位和header条是占据整行的，因此在onCreateViewHolder()里要通过setFullSpan()方式实现单条item占满整行。

public class ShenquAttentionRecyclerAdapter extends RecyclerView.Adapter {

public static final int VIEW_TYPE_LIVE_NOTICE = R.layout.vh_live_notice;

public static final int VIEW_TYPE_ATTENTION_VIDEO = R.layout.vh_attention_video;

public static final int VIEW_TYPE_BASE_HEADER = R.layout.vh_base_header;

public static final int VIEW_TYPE_EMPTY_ATTENTION_VIDEO=R.layout.vh_empty_attention_video;

@Override

public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {

if (holder instanceof LiveNoticeVH) {

LiveNoticeVH liveNoticeVH = (LiveNoticeVH) holder;

liveNoticeVH.setData(liveNoticeData);

} else if (holder instanceof AttentionVideoVH && attentionVideoList.size() > 0) {

MLog.debug(TAG, "position=" + position);

AttentionVideoVH attentionVideoVH = (AttentionVideoVH) holder;

attentionVideoVH.initData(attentionVideoList.get(position - count));

holder.itemView.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

if (mClickListener != null) {

mClickListener.onItemClick(position - count, v, holder);

}

}

});

}else if(holder instanceof EmptyAttentionVideoVH ){

View itemView = holder.itemView;

RecyclerView.LayoutParams param= (RecyclerView.LayoutParams) itemView.getLayoutParams();

if (isHideAttentionView){

param.height = LinearLayout.LayoutParams.WRAP_CONTENT;

param.width = LinearLayout.LayoutParams.MATCH_PARENT;

itemView.setVisibility(View.VISIBLE);

}else{

itemView.setVisibility(View.GONE);

param.height = 0;

param.width = 0;

}

itemView.setLayoutParams(param);

}

}

@Override

public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

LayoutInflater inflater = LayoutInflater.from(parent.getContext()); //Inflater为全局单例模式

View itemView = inflater.inflate(viewType, parent, false);

StaggeredGridLayoutManager.LayoutParams layoutParams = (StaggeredGridLayoutManager.LayoutParams) itemView.getLayoutParams();

layoutParams.setFullSpan(true);//将 StaggeredGrid的某个item直接占满宽

if (viewType == VIEW_TYPE_LIVE_NOTICE) { //直播预览

LiveNoticeVH liveNoticeVH = new LiveNoticeVH(itemView);

return liveNoticeVH;

} else if (viewType == VIEW_TYPE_BASE_HEADER) { //标题头

return new BaseHeaderVH(itemView);

} else if (viewType == VIEW_TYPE_ATTENTION_VIDEO) {

AttentionVideoVH attentionVideoVH = new AttentionVideoVH(itemView);

layoutParams.setFullSpan(false);

return attentionVideoVH;

} else return new EmptyAttentionVideoVH(itemView);

}

@Override

public int getItemViewType(int position) {

if (position == 0) {

return VIEW_TYPE_LIVE_NOTICE;

} else if (position == 1) {

return VIEW_TYPE_BASE_HEADER;

}else if(position==2){

return VIEW_TYPE_EMPTY_ATTENTION_VIDEO ;

}

else {

return VIEW_TYPE_ATTENTION_VIDEO;

}

}

}