SwipeRefreshLayout+RecyclerView实现上拉刷新和下拉刷新功能

<android.support.v4.widget.SwipeRefreshLayout
 xmlns: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.RecyclerView
 android: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>

@Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 
 mSwipeRefreshWidget = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_widget);
 mRecyclerView = (RecyclerView) findViewById(android.R.id.list);
 
 mSwipeRefreshWidget.setColorScheme(R.color.color1, R.color.color2,
 R.color.color3, R.color.color4);
 mSwipeRefreshWidget.setOnRefreshListener(this);
 
 // 这句话是为了，第一次进入页面的时候显示加载进度条
 mSwipeRefreshWidget.setProgressViewOffset(false, 0, (int) TypedValue
 .applyDimension(TypedValue.COMPLEX_UNIT_DIP, 24, getResources()
 .getDisplayMetrics()));
 
 mRecyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() {
 
 @Override
 public void onScrollStateChanged(RecyclerView recyclerView,
 int newState) {
 super.onScrollStateChanged(recyclerView, newState);
 if (newState == RecyclerView.SCROLL_STATE_IDLE
 && lastVisibleItem + 1 == adapter.getItemCount()) {
 mSwipeRefreshWidget.setRefreshing(true);
 // 此处在现实项目中，请换成网络请求数据代码，sendRequest .....
 handler.sendEmptyMessageDelayed(0, 3000);
 }
 }
 
 @Override
 public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
 super.onScrolled(recyclerView, dx, dy);
 lastVisibleItem = mLayoutManager.findLastVisibleItemPosition();
 }
 
 });
 
 mRecyclerView.setHasFixedSize(true);
 mLayoutManager = new LinearLayoutManager(this);
 mRecyclerView.setLayoutManager(mLayoutManager);
 mRecyclerView.setItemAnimator(new DefaultItemAnimator());
 
 adapter = new SampleAdapter();
 mRecyclerView.setAdapter(adapter);
 
 // 此处在现实项目中，请换成网络请求数据代码，sendRequest .....
 handler.sendEmptyMessageDelayed(0, 3000);
 }

mRecyclerView = (RecyclerView) findViewById(android.R.id.list);
mRecyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() {
 
 @Override
 public void onScrollStateChanged(RecyclerView recyclerView,
 int newState) {
 super.onScrollStateChanged(recyclerView, newState);
 if (newState == RecyclerView.SCROLL_STATE_IDLE
 && lastVisibleItem + 1 == adapter.getItemCount()) {
 mSwipeRefreshWidget.setRefreshing(true);
 // 此处在现实项目中，请换成网络请求数据代码，sendRequest .....
 handler.sendEmptyMessageDelayed(0, 3000);
 }
 }
 
 @Override
 public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
 super.onScrolled(recyclerView, dx, dy);
 lastVisibleItem = mLayoutManager.findLastVisibleItemPosition();
 }
 });
 
 mRecyclerView.setHasFixedSize(true);
 mLayoutManager = new LinearLayoutManager(this);
 mRecyclerView.setLayoutManager(mLayoutManager);
 mRecyclerView.setItemAnimator(new DefaultItemAnimator());
 
 adapter = new SampleAdapter();
 mRecyclerView.setAdapter(adapter);

public class SampleAdapter extends RecyclerView.Adapter<ViewHolder> {
 private List<Integer> list;
 
 private static final int TYPE_ITEM = 0;
 private static final int TYPE_FOOTER = 1;
 
 public List<Integer> getList() {
 return list;
 }
 
 public SampleAdapter() {
 list = new ArrayList<Integer>();
 }
 
 // RecyclerView的count设置为数据总条数+ 1（footerView）
 @Override
 public int getItemCount() {
 return list.size() + 1;
 }
 
 @Override
 public int getItemViewType(int position) {
 // 最后一个item设置为footerView
 if (position + 1 == getItemCount()) {
 return TYPE_FOOTER;
 } else {
 return TYPE_ITEM;
 }
 }
 
 @Override
 public void onBindViewHolder(ViewHolder holder, final int position) {
 if (holder instanceof ItemViewHolder) {
 ((ItemViewHolder) holder).textView.setText(String.valueOf(list
 .get(position)));
 }
 }
 
 @Override
 public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
 if (viewType == TYPE_ITEM) {
 View view = LayoutInflater.from(parent.getContext()).inflate(
 R.layout.list_item_text, null);
 view.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
 LayoutParams.WRAP_CONTENT));
 return new ItemViewHolder(view);
 }
 // type == TYPE_FOOTER 返回footerView
 else if (viewType == TYPE_FOOTER) {
 View view = LayoutInflater.from(parent.getContext()).inflate(
 R.layout.footerview, null);
 view.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
 LayoutParams.WRAP_CONTENT));
 return new FooterViewHolder(view);
 }
 
 return null;
 }
 
 class FooterViewHolder extends ViewHolder {
 
 public FooterViewHolder(View view) {
 super(view);
 }
 
 }
 
 class ItemViewHolder extends ViewHolder {
 TextView textView;
 
 public ItemViewHolder(View view) {
 super(view);
 textView = (TextView) view.findViewById(R.id.text);
 }
 }
}