AndroidApp使用RecyclerView实现上拉和下拉刷新的方法

@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 { 
 private List list; 
 
 private static final int TYPE_ITEM = 0; 
 private static final int TYPE_FOOTER = 1; 
 
 public List getList() { 
 return list; 
 } 
 
 public SampleAdapter() { 
 list = new ArrayList(); 
 } 
 
 // 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); 
 } 
 } 
}