概述：

RecyclerView是android-support-v7-21版本中新增的一個Widgets，RecyclerView是ListView的升級版本，更加先進和靈活。在以后的開發(fā)中我們就可以直接使用RecyclerView來替換ListView。

特點介紹：

1. 可橫向展示

2. 消除錯位問題

3.?標準化了ViewHolder

橫向：

private void initHorizaontal(List<ItemModel> models) {RecyclerView recyclerView = (RecyclerView) findViewById(R.id.activity_main_horizontal_recyclerview);LinearLayoutManager layoutManager = new LinearLayoutManager(MainActivity.this);layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);recyclerView.setLayoutManager(layoutManager);RecyclerViewAdapter adapter = new RecyclerViewAdapter(MainActivity.this, models);recyclerView.setAdapter(adapter);}

豎向：

public void initVertical(List<ItemModel> models) {RecyclerView recyclerView = (RecyclerView) findViewById(R.id.activity_main_vertical_recyclerview);LinearLayoutManager layoutManager = new LinearLayoutManager(MainActivity.this);layoutManager.setOrientation(LinearLayoutManager.VERTICAL);recyclerView.setLayoutManager(layoutManager);RecyclerViewAdapter adapter = new RecyclerViewAdapter(MainActivity.this, models);recyclerView.setAdapter(adapter);}

Adapter的變化：

Google在對RecyclerView的改進中還為我們解決了一個初學者比較頭痛的問題：錯位。

public class RecyclerViewAdapter extends RecyclerView.Adapter<ViewHolder> {private List<ItemModel> mList = null;private Context mContext = null;private LayoutInflater mInflater = null;public RecyclerViewAdapter(Context context, List<ItemModel> list) {mContext = context;mList = list;mInflater = LayoutInflater.from(mContext);}@Overridepublic int getItemCount() {if (mList != null) {return mList.size();}return 0;}@Overridepublic void onBindViewHolder(ViewHolder viewHolder, int position) {((ItemViewHolder)viewHolder).mLabelTextView.setText(mList.get(position).getLabel());}@Overridepublic ViewHolder onCreateViewHolder(ViewGroup viewGroup, int arg1) {View view = mInflater.inflate(R.layout.list_item, viewGroup, false);ItemViewHolder holder = new ItemViewHolder(view);holder.mLabelTextView = (TextView) view.findViewById(R.id.list_item_textview);return holder;}public static class ItemViewHolder extends ViewHolder{public ItemViewHolder(View itemView) {super(itemView);}private TextView mLabelTextView = null;} }

上拉或下拉刷新：

對于下拉刷新，Android自身有一個控件SwipeRefreshLayout已經(jīng)有所實現(xiàn)。我們把SwipeRefreshLayout包在RecyclerView的外面，然后再設(shè)置其綁定到一個OnRefreshListener上。

布局：

<android.support.v4.widget.SwipeRefreshLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:id="@+id/swipe_refresh_widget"android:layout_width="match_parent"android:layout_height="match_parent" ><android.support.v7.widget.RecyclerViewandroid:id="@android:id/list"android:layout_width="match_parent"android:layout_height="match_parent"android:cacheColorHint="@null"android:scrollbars="vertical" /></android.support.v4.widget.SwipeRefreshLayout>

監(jiān)聽：

@Overridepublic void onRefresh() {handler.sendEmptyMessageDelayed(0, 3000);}

而對于上拉刷新，我們則是自定義一個FooterView和線程來進行的。

mRecyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() {@Overridepublic void onScrollStateChanged(RecyclerView recyclerView,int newState) {super.onScrollStateChanged(recyclerView, newState);if (newState == RecyclerView.SCROLL_STATE_IDLE && lastVisibleItem + 1 == adapter.getItemCount()) {handler.sendEmptyMessageDelayed(1, 3000);}}@Overridepublic void onScrolled(RecyclerView recyclerView, int dx, int dy) {super.onScrolled(recyclerView, dx, dy);lastVisibleItem = mLayoutManager.findLastVisibleItemPosition();}});

相關(guān)源碼下載：

RecyclerView初步使用

RecyclerView的上拉和下拉刷新

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