使用SwipeRefreshLayout和RecyclerView实现下拉刷新上拉加载更多

• 效果图:
  

• 文件目录
  

• 布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<android.support.v4.widget.SwipeRefreshLayout
 android:id="@+id/demo_swiperefreshlayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical">

<android.support.v7.widget.RecyclerView
 android:id="@+id/demo_recycler"
android:layout_width="match_parent"
android:layout_height="match_parent" />

</android.support.v4.widget.SwipeRefreshLayout>

</LinearLayout>

• RefreshRecyclerAdapter

public class RefreshRecyclerAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private static final int TYPE_ITEM = 0;
private static final int TYPE_FOOTER = 1;

public boolean isLoadMore = false;

private Context mContext;
private LayoutInflater mInflater;
private List<String> mTitles = null;

public RefreshRecyclerAdapter(Context context) {
this.mContext = context;
this.mInflater = LayoutInflater.from(context);
this.mTitles = new ArrayList<>();
for (int i = 0; i < 20; i++) {
int index = i + 1;
            mTitles.add("item" + index);
        }
    }

    @Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(-1, -2);
if (viewType == TYPE_ITEM) {
final TextView view = new TextView(mContext);
            view.setGravity(Gravity.CENTER);
            view.setLayoutParams(lp);
            ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
        }
final ProgressBar bar = new ProgressBar(mContext);
        bar.setLayoutParams(lp);
        ProgressViewHoler barViewHolder = new ProgressViewHoler(bar);
return barViewHolder;
    }

    @Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if (holder instanceof ViewHolder) {
            ((ViewHolder) holder).item_tv.setText(mTitles.get(position));
            ((ViewHolder) holder).item_tv.setTag(position);
        }
// ((ProgressViewHoler)(holder)).bar.setScrollBarStyle(ProgressBar.);
    }

    @Override
public int getItemCount() {
if (isLoadMore) {
return mTitles.size() + 1;
        }
return mTitles.size();
    }

    @Override
public int getItemViewType(int position) {
if (position + 1 == getItemCount() && isLoadMore) {
return TYPE_FOOTER;
        }
return TYPE_ITEM;
    }

public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView item_tv;

public ViewHolder(View itemView) {
super(itemView);
            item_tv = (TextView) itemView;
        }
    }

public static class ProgressViewHoler extends RecyclerView.ViewHolder {
public ProgressBar bar;

public ProgressViewHoler(View itemView) {
super(itemView);
            bar = (ProgressBar) itemView;
        }
    }

public void addItem(List<String> newDatas) {
        newDatas.addAll(mTitles);
        mTitles.removeAll(mTitles);
        mTitles.addAll(newDatas);
        notifyDataSetChanged();
    }

public void addMoreItem(List<String> newData) {
        mTitles.addAll(newData);
        isLoadMore = false;
        notifyDataSetChanged();
    }

public void startLoad() {
        isLoadMore = true;
        notifyDataSetChanged();
    }
}

• MainActivity.java

public class MainActivity extends AppCompatActivity {

@Bind(R.id.demo_swiperefreshlayout)
    SwipeRefreshLayout swipeRefreshLayout;

@Bind(R.id.demo_recycler)
    RecyclerView recyclerView;

private RefreshRecyclerAdapter adapter;
private LinearLayoutManager linearLayoutManager;
private int lastVisibleItem;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

        swipeRefreshLayout.setProgressBackgroundColorSchemeResource(android.R.color.white);
        swipeRefreshLayout.setColorSchemeResources(android.R.color.holo_blue_light,
                android.R.color.holo_red_light, android.R.color.holo_orange_light,
                android.R.color.holo_green_light);
        swipeRefreshLayout.setProgressViewOffset(false, 0,
                (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 24, getResources().getDisplayMetrics()));
        linearLayoutManager = new LinearLayoutManager(this);
        linearLayoutManager.setOrientation(OrientationHelper.VERTICAL);
        recyclerView.setLayoutManager(linearLayoutManager);
        recyclerView.setAdapter(adapter = new RefreshRecyclerAdapter(this));

        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
                        List<String> newDatas = new ArrayList<String>();
for (int i = 0; i < 5; i++) {
int index = i + 1;
                            newDatas.add("new item" + index);
                        }
                        adapter.addItem(newDatas);
                        swipeRefreshLayout.setRefreshing(false);
                        Toast.makeText(MainActivity.this, "更新了5条数据", Toast.LENGTH_SHORT).show();
                    }
                }, 5000);
            }
        });

        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if(swipeRefreshLayout.isRefreshing()) return;
if (newState == RecyclerView.SCROLL_STATE_IDLE && lastVisibleItem == adapter.getItemCount() - 1) {
                    adapter.startLoad();
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
                            List<String> newDatas = new ArrayList<String>();
for (int i = 0; i < 5; i++) {
int index = i + 1;
                                newDatas.add("more item" + index);
                            }
                            adapter.addMoreItem(newDatas);
                        }
                    }, 1000);
                }
            }

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
                lastVisibleItem = linearLayoutManager.findLastVisibleItemPosition();
            }
        });
    }
}

• gradle依赖

   compile 'com.jakewharton:butterknife:7.0.1'
    compile 'com.android.support:recyclerview-v7:25.1.1'