SwipeRefreshLayout使用

一.新建LoadDataScrollController
public class LoadDataScrollController extends RecyclerView.OnScrollListener implements SwipeRefreshLayout.OnRefreshListener {
public enum LayoutManagerType {
LINEAR_LAYOUT,
GRID_LAYOUT,
STAGGERED_GRID_LAYOUT
}
/**
* 当前布局管理器的类型
*/
private LayoutManagerType mLayoutManagerType;

/**
 * 当前RecycleView显示的最大条目
 */
private int mLastVisibleItemPosition;


/**
 * 每列的最后一个条目
 */
private int[] mLastPostions;


/**
 * 是否正在加载数据 包括刷新和向上加载更多
 */
private boolean isLoadData = false;


/**
 * 回调接口
 */
private OnRecycleRefreshListener mListener;


public LoadDataScrollController(OnRecycleRefreshListener onRecycleRefreshListener) {
    this.mListener = onRecycleRefreshListener;
}

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {

    /**
     * 获取布局参数
     */
    RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();

    //如果为null，第一次运行，确定布局类型
    if (mLayoutManagerType == null) {
        if (layoutManager instanceof LinearLayoutManager) {
            mLayoutManagerType = LayoutManagerType.LINEAR_LAYOUT;
        } else if (layoutManager instanceof GridLayoutManager) {
            mLayoutManagerType = LayoutManagerType.GRID_LAYOUT;
        } else if (layoutManager instanceof StaggeredGridLayoutManager) {
            mLayoutManagerType = LayoutManagerType.STAGGERED_GRID_LAYOUT;
        } else {
            throw new RuntimeException("LayoutManager should be LinearLayoutManager,GridLayoutManager,StaggeredGridLayoutManager");
        }
    }

    //对于不太能够的布局参数，不同的方法获取到当前显示的最后一个条目数
    switch (mLayoutManagerType) {
        case LINEAR_LAYOUT:
            mLastVisibleItemPosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition();
            break;
        case GRID_LAYOUT:
            mLastVisibleItemPosition = ((GridLayoutManager) layoutManager).findLastVisibleItemPosition();
            break;
        case STAGGERED_GRID_LAYOUT:
            StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;
            if (mLastPostions == null) {
                mLastPostions = new int[staggeredGridLayoutManager.getSpanCount()];
            }
            staggeredGridLayoutManager.findLastVisibleItemPositions(mLastPostions);
            mLastVisibleItemPosition = findMax(mLastPostions);
            break;
        default:
            break;
    }

}

@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {

    RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();

    //RecycleView 显示的条目数
    int visibleCount = layoutManager.getChildCount();

    //显示数据总数
    int totalCount = layoutManager.getItemCount();


    // 四个条件，分别是是否有数据，状态是否是滑动停止状态，显示的最大条目是否大于整个数据（注意偏移量），是否正在加载数据
    if(visibleCount>0
            &&newState==RecyclerView.SCROLL_STATE_IDLE
            &&mLastVisibleItemPosition>=totalCount-1
            &&!isLoadData){
        //可以加载数据
        if(mListener!=null){
            isLoadData = true;
            mListener.loadMore();
        }
    }

}


/**
 * 当是瀑布流时，获取到的是每一个瀑布最下方显示的条目，通过条目进行对比
 */
private int findMax(int[] lastPositions) {
    int max = lastPositions[0];
    for (int value : lastPositions) {
        if (value > max) {
            max = value;
        }
    }
    return max;
}


public void setLoadDataStatus(boolean isLoadData){
    this.isLoadData = isLoadData;
}

@Override
public void onRefresh() {
    //刷新数据的方法
    if(mListener!=null){
        isLoadData = true;
        mListener.refresh();
    }

}

/**
 * 数据加载接口回调
 */
public interface OnRecycleRefreshListener{
    void refresh();
    void loadMore();
}

}
二.调用
private LoadDataScrollController mController;

private ProgressDialog pd;
private MyWalletAdapter mAdapter;

void getDate(){
mSwipeRefresh.setColorSchemeColors(Color.GRAY);

    /**
     * 创建控制器，同时使当前activity实现数据监听回调接口
     */
    mController = new LoadDataScrollController(this);
    mAdapter = new MyWalletAdapter(getContext());

    //设置垂直的线性布局管理器，Orientation --> VERTICAL:垂直 HORIZONTAL:水平
    LinearLayoutManager layoutManager = new LinearLayoutManager(getContext());
    layoutManager.setOrientation(LinearLayoutManager.VERTICAL);

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

    //添加分割线
    mRecycle.addItemDecoration(new DividerItemDecoration(getContext().getApplicationContext(), DividerItemDecoration.VERTICAL));


    mRecycle.setLayoutManager(layoutManager);

    mRecycle.setItemAnimator(new DefaultItemAnimator());

    mRecycle.setAdapter(mAdapter);

    mAdapter.notifyDataSetChanged();

    /**
     * 设置监听
     */
    mRecycle.addOnScrollListener(mController);

    mSwipeRefresh.setOnRefreshListener(mController);

}
@Override
public void refresh() {
    //刷新的接口调
    mSwipeRefresh.postDelayed(new Runnable() {
        @Override
        public void run() {
            mAdapter.notifyDataSetChanged();
            mSwipeRefresh.setRefreshing(false);
            mController.setLoadDataStatus(false);
        }
    },2000);
}

@Override
public void loadMore() {
    //加载更多的接口回调
    pd = new ProgressDialog(getContext());
    pd.show();
    mSwipeRefresh.postDelayed(new Runnable() {
        @Override
        public void run() {
          //  mAdapter.notifyDataSetChanged();
            //设置数据加载结束的监听状态
            mController.setLoadDataStatus(false);
            pd.dismiss();
        }
    },2000);
}