RecyclerView续，下拉刷新与上拉加载

   <p>上次写了RecyclerView的强大，忘了补充好多个问题，今天全部补上。</p>    <p>首先下拉刷新，这个简单，所以我也只是简单说说</p>    <p>我一直都是认为谷歌有自带的框架就不用第三方，所以当然是用SwipeRefreshLayout来下拉刷新</p>    <p>配置下很简单</p>    <pre>  <code class="language-java">mSwipeRefreshLayout.setOnRefreshListener(mOnRefreshListener);          mSwipeRefreshLayout.setColorSchemeResources(R.color.status_bar_bg, R.color.orange, R.color.green);        /**       * 刷新       */      private SwipeRefreshLayout.OnRefreshListener mOnRefreshListener = new SwipeRefreshLayout.OnRefreshListener() {          @Override          public void onRefresh() {              pageNum = 1;              mAdapter.clearList();//清楚数据，上一篇文章的事              getData();//获取数据          }      };</code></pre>    <p>官方控件简简单单的下拉刷新就完成了</p>    <p>接下来是上拉加载，别人扔给我的控件</p>    <pre>  <code class="language-java">mRecyclerView.addOnScrollListener(mOnScrollListener);          /**       * RecycleView的滑动监听(加载更多)       */      private EndlessRecyclerOnScrollListener mOnScrollListener = new EndlessRecyclerOnScrollListener() {            @Override          public void onLoadNextPage(View view) {              super.onLoadNextPage(view);              //下面这是重点，第三个参数是一页10条（用来控制是否可以继续下拉），第四个是显示加载状态，最后一个可以配置点击重试请求网络              RecyclerViewStateUtils.setFooterViewState(Activity.this, mRecyclerView, 10, LoadingFooter.State.Loading, null);              pageNum++;              getData();          }      };</code></pre>    <p>那个设置状态的几种类型：</p>    <pre>  <code class="language-java">RecyclerViewStateUtils.setFooterViewState(mRecyclerView, LoadingFooter.State.Normal); //加载完成后不显示的正常状态    RecyclerViewStateUtils.setFooterViewState(mRecyclerView, LoadingFooter.State.TheEnd);//没有下一页的状态     RecyclerViewStateUtils.setFooterViewState(Activity.this, mRecyclerView, 10, LoadingFooter.State.Loading, null);//加载状态</code></pre>    <p>接着上EndlessRecyclerOnScrollListener</p>    <pre>  <code class="language-java">public class RecyclerViewStateUtils {        /**       * 设置headerAndFooterAdapter的FooterView State       *       * @param instance      context       * @param recyclerView  recyclerView       * @param pageSize      分页展示时，recyclerView每一页的数量       * @param state         FooterView State       * @param errorListener FooterView处于Error状态时的点击事件       */      public static void setFooterViewState(Activity instance, RecyclerView recyclerView, int pageSize, LoadingFooter.State state, View.OnClickListener errorListener) {            if(instance==null || instance.isFinishing()) {              return;          }            RecyclerView.Adapter outerAdapter = recyclerView.getAdapter();            if (outerAdapter == null || !(outerAdapter instanceof HeaderAndFooterRecyclerViewAdapter)) {              return;          }            HeaderAndFooterRecyclerViewAdapter headerAndFooterAdapter = (HeaderAndFooterRecyclerViewAdapter) outerAdapter;            //只有一页的时候，就别加什么FooterView了          if (headerAndFooterAdapter.getInnerAdapter().getItemCount() < pageSize) {              return;          }            LoadingFooter footerView;            //已经有footerView了          if (headerAndFooterAdapter.getFooterViewsCount() > 0) {              footerView = (LoadingFooter) headerAndFooterAdapter.getFooterView();              footerView.setState(state);                if (state == LoadingFooter.State.NetWorkError) {                  footerView.setOnClickListener(errorListener);              }              recyclerView.scrollToPosition(headerAndFooterAdapter.getItemCount() - 1);          } else {              footerView = new LoadingFooter(instance);              footerView.setState(state);                if (state == LoadingFooter.State.NetWorkError) {                  footerView.setOnClickListener(errorListener);              }                headerAndFooterAdapter.addFooterView(footerView);              recyclerView.scrollToPosition(headerAndFooterAdapter.getItemCount() - 1);          }      }        /**       * 获取当前RecyclerView.FooterView的状态       *       * @param recyclerView       */      public static LoadingFooter.State getFooterViewState(RecyclerView recyclerView) {            RecyclerView.Adapter outerAdapter = recyclerView.getAdapter();          if (outerAdapter != null && outerAdapter instanceof HeaderAndFooterRecyclerViewAdapter) {              if (((HeaderAndFooterRecyclerViewAdapter) outerAdapter).getFooterViewsCount() > 0) {                  LoadingFooter footerView = (LoadingFooter) ((HeaderAndFooterRecyclerViewAdapter) outerAdapter).getFooterView();                  return footerView.getState();              }          }            return LoadingFooter.State.Normal;      }        /**       * 设置当前RecyclerView.FooterView的状态       *       * @param recyclerView       * @param state       */      public static void setFooterViewState(RecyclerView recyclerView, LoadingFooter.State state) {          RecyclerView.Adapter outerAdapter = recyclerView.getAdapter();          if (outerAdapter != null && outerAdapter instanceof HeaderAndFooterRecyclerViewAdapter) {              if (((HeaderAndFooterRecyclerViewAdapter) outerAdapter).getFooterViewsCount() > 0) {                  LoadingFooter footerView = (LoadingFooter) ((HeaderAndFooterRecyclerViewAdapter) outerAdapter).getFooterView();                  footerView.setState(state);              }          }      }  }</code></pre>    <p>好了上拉加载完成了</p>    <p>建议：加载的时候可以清楚上拉加载的监听，完成了，确定不是最后一页了再加上</p>    <p>mRecyclerView.clearOnScrollListeners();<br> mRecyclerView.addOnScrollListener(mOnScrollListener);</p>    <p> </p>    <p>来自：http://www.jianshu.com/p/7fde3ec5a23e</p>    <p> </p>