<h2>SwipeRefresh</h2>    <p>基于原生的SwipeRefreshLayout 做了封装处理</p>    <h2>此项目中包括种：</h2>    <ul>     <li> <p>1.原生SwipeRefreshLayout（上拉可通过滚动监听实现）</p> </li>     <li> <p>2.自定义支持上拉刷新的组件</p> </li>     <li> <p>3.自定义支持ViewPage的刷新组件VPSwipeRefreshLayout</p> </li>     <li> <p>4.RecyclerView+SwpieRefreshLayout实现下拉刷新效果同时实现上拉功能</p> </li>    </ul>    <p style="text-align: center;"><img src="https://simg.open-open.com/show/86a5b039c9515be40ccf0a09306f16dd.png"></p>    <p style="text-align: center;">主界面</p>    <h3>1.原生SwipeRefreshLayout（上拉可通过滚动监听实现）</h3>    <p>除了OnRefreshListener接口外，SwipRefreshLayout中还有一些其他重要的方法，具体如下：</p>    <pre>  1、setOnRefreshListener(SwipeRefreshLayout.OnRefreshListener listener):设置手势滑动监听器。               2、setProgressBackgroundColor(int colorRes):设置进度圈的背景色（已经弃用）                setProgressBackgroundColorSchemeResource （可以）。                setProgressBackgroundColorSchemeColor（Color c） (可以)             3、setColorSchemeResources(int… colorResIds):设置进度动画的颜色。             4、setRefreshing(Boolean refreshing):设置组件的刷洗状态，显示或者隐藏刷新进度条              5、setSize(int size):设置进度圈的大小，只有两个值：DEFAULT、LARGE             6、postDelayed(new Runable(),long min) 设置刷新延迟时间             7、isRefreshing():检查是否处于刷新状态</pre>    <p style="text-align: center;"><img src="https://simg.open-open.com/show/80accaa823ec861f2ce0bea3ac71e657.png"></p>    <p style="text-align: center;">下拉刷新</p>    <p>布局，具体内容如下：</p>    <pre>  <?xml version="1.0" encoding="utf-8"?>  <android.support.v4.widget.SwipeRefreshLayout       xmlns:android="http://schemas.android.com/apk/res/android"      android:layout_width="match_parent"      android:layout_height="match_parent"      android:orientation="vertical"      android:id="@+id/swipeLayout" >        <ListView           android:id="@+id/mylist"          android:layout_width="match_parent"          android:layout_height="wrap_content"/>    </android.support.v4.widget.SwipeRefreshLayout></pre>    <p>Activity核心代码如下：</p>    <pre>  swipeRefreshLayout = (SwipeRefreshLayout)findViewById(R.id.swipeLayout);    /*加载的渐变动画*/          swipeRefreshLayout.setColorSchemeResources(R.color.swipe_color_1,                  R.color.swipe_color_2,                  R.color.swipe_color_3,                  R.color.swipe_color_4);          swipeRefreshLayout.setSize(SwipeRefreshLayout.LARGE);;          swipeRefreshLayout.setProgressBackgroundColor(R.color.swipe_background_color);          //swipeRefreshLayout.setPadding(20, 20, 20, 20);          //swipeRefreshLayout.setProgressViewOffset(true, 100, 200);          //swipeRefreshLayout.setDistanceToTriggerSync(50);          swipeRefreshLayout.setProgressViewEndTarget(true, 100);          swipeRefreshLayout.setOnRefreshListener(new OnRefreshListener() {              @Override              public void onRefresh() {                  new Thread(new Runnable() {                      @Override                      public void run() {                          data.clear();                          for(int i=0;i<20;i++){                              data.add("SwipeRefreshLayout下拉刷新"+i);                          }                          try {                              Thread.sleep(5000);                          } catch (InterruptedException e) {                              e.printStackTrace();                          }                          mHandler.sendEmptyMessage(1);                      }                  }).start();              }          });      //handler      private Handler mHandler = new Handler(){          @Override          public void handleMessage(Message msg) {              super.handleMessage(msg);              switch (msg.what) {              case 1:                    swipeRefreshLayout.setRefreshing(false);                  adapter.notifyDataSetChanged();                  //swipeRefreshLayout.setEnabled(false);                  break;              default:                  break;              }          }      };</pre>    <ul>     <li>原生实现上拉效果</li>    </ul>    <p>通过监听滚动事件，对listview添加底部的组件实现上拉</p>    <pre>  implements AbsListView.OnScrollListener {···       ···    /**           * 对listview添加底部的组件实现上拉           */          footerView = getLayoutInflater().inflate(R.layout.refresh_footview_layout, null);          lv.addFooterView(footerView);    /**           * 设置滚动监听           */     lv.setOnScrollListener(this);        /**       * 重写滚动方法       * @param view       * @param scrollState       */      @Override      public void onScrollStateChanged(AbsListView view, int scrollState) {          if (adapter.getCount() == visibleLastIndex && scrollState == SCROLL_STATE_IDLE) {              Toast.makeText(this, "加载更多完成", Toast.LENGTH_SHORT).show();              footerView.setVisibility(View.GONE);              /*在此处加载更多数据*/  //            new LoadDataThread().start();          }else {              footerView.setVisibility(View.VISIBLE);  //            Toast.makeText(this, "加载更多...", Toast.LENGTH_SHORT).show();          }        }</pre>    <h3>2.自定义支持上拉刷新的组件</h3>    <p style="text-align: center;"><img src="https://simg.open-open.com/show/b048b406841ec6b0e2b9d0dcd184cec1.png"></p>    <p style="text-align: center;">上拉刷新</p>    <p>实现下拉和上拉监听</p>    <pre>  ···AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener,          RefreshLayout.OnLoadListener {          ···</pre>    <p>下拉和原先一样用法：</p>    <pre>  //下拉监听          swipeLayout.setOnRefreshListener(this);          //上拉监听          swipeLayout.setOnLoadListener(this);             /**       * 上拉刷新       */      @Override      public void onRefresh() {          swipeLayout.postDelayed(new Runnable() {                @Override              public void run() {                  // 更新数据  更新完后调用该方法结束刷新                  list.clear();                  for (int i = 0; i < 8; i++) {                      HashMap<String, String> map = new HashMap<String, String>();                      map.put("itemImage", i + "刷新");                      map.put("itemText", i + "刷新");                      list.add(map);                  }                  adapter.notifyDataSetChanged();                  swipeLayout.setRefreshing(false);              }          }, 2000);        }        /**       * 加载更多       */      @Override      public void onLoad() {          swipeLayout.postDelayed(new Runnable() {              @Override              public void run() {                  // 更新数据  更新完后调用该方法结束刷新                  swipeLayout.setLoading(false);                  for (int i = 1; i < 10; i++) {                      HashMap<String, String> map = new HashMap<String, String>();                      map.put("itemImage", i + "更多");                      map.put("itemText", i + "更多");                      list.add(map);                  }                  adapter.notifyDataSetChanged();              }          }, 2000);      }</pre>    <ul>     <li>自定义组件如下：</li>    </ul>    <pre>  /**   * Created by huangshuyuan on 2017/3/9.   * email:hshuuyuan@foxmail.com   * version:v1.0   * <p>   * 自定义view   */    /**   * 继承自SwipeRefreshLayout,从而实现滑动到底部时上拉加载更多的功能.   */  public class RefreshLayout extends SwipeRefreshLayout implements          OnScrollListener {      /**       * 滑动到最下面时的上拉操作       */        private int mTouchSlop;      /**       * listview实例       */      private ListView mListView;        /**       * 上拉监听器, 到了最底部的上拉加载操作       */      private OnLoadListener mOnLoadListener;        /**       * ListView的加载中footer       */      private View mListViewFooter;        /**       * 按下时的y坐标       */      private int mYDown;      /**       * 抬起时的y坐标, 与mYDown一起用于滑动到底部时判断是上拉还是下拉       */      private int mLastY;      /**       * 是否在加载中 ( 上拉加载更多 )       */      private boolean isLoading = false;        /**       * @param context       */      public RefreshLayout(Context context) {          this(context, null);      }        @SuppressLint("InflateParams")      public RefreshLayout(Context context, AttributeSet attrs) {          super(context, attrs);            mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();            mListViewFooter = LayoutInflater.from(context).inflate(                  R.layout.listview_footer, null, false);      }        @Override      protected void onLayout(boolean changed, int left, int top, int right,                              int bottom) {          super.onLayout(changed, left, top, right, bottom);          // 初始化ListView对象          if (mListView == null) {              getListView();          }      }        /**       * 获取ListView对象       */      private void getListView() {          int childs = getChildCount();          if (childs > 0) {              View childView = getChildAt(0);              if (childView instanceof ListView) {                  mListView = (ListView) childView;                  // 设置滚动监听器给ListView, 使得滚动的情况下也可以自动加载                  mListView.setOnScrollListener(this);                  Log.d(VIEW_LOG_TAG, "### 找到listview");              }          }      }        /*       * (non-Javadoc)       *       * @see android.view.ViewGroup#dispatchTouchEvent(android.view.MotionEvent)       */      @Override      public boolean dispatchTouchEvent(MotionEvent event) {          final int action = event.getAction();            switch (action) {              case MotionEvent.ACTION_DOWN:                  // 按下                  mYDown = (int) event.getRawY();                  break;                case MotionEvent.ACTION_MOVE:                  // 移动                  mLastY = (int) event.getRawY();                  break;                case MotionEvent.ACTION_UP:                  // 抬起                  if (canLoad()) {                      loadData();                  }                  break;              default:                  break;          }            return super.dispatchTouchEvent(event);      }        /**       * 是否可以加载更多, 条件是到了最底部, listview不在加载中, 且为上拉操作.       *       * @return       */      private boolean canLoad() {          return isBottom() && !isLoading && isPullUp();      }        /**       * 判断是否到了最底部       */      private boolean isBottom() {            if (mListView != null && mListView.getAdapter() != null) {              return mListView.getLastVisiblePosition() == (mListView                      .getAdapter().getCount() - 1);          }          return false;      }        /**       * 是否是上拉操作       *       * @return       */      private boolean isPullUp() {          return (mYDown - mLastY) >= mTouchSlop;      }        /**       * 如果到了最底部,而且是上拉操作.那么执行onLoad方法       */      private void loadData() {          if (mOnLoadListener != null) {              // 设置状态              setLoading(true);              //              mOnLoadListener.onLoad();          }      }        /**       * @param loading       */      public void setLoading(boolean loading) {          isLoading = loading;          if (isLoading) {              mListView.addFooterView(mListViewFooter);          } else {              mListView.removeFooterView(mListViewFooter);              mYDown = 0;              mLastY = 0;          }      }        /**       * @param loadListener       */      public void setOnLoadListener(OnLoadListener loadListener) {          mOnLoadListener = loadListener;      }        @Override      public void onScrollStateChanged(AbsListView view, int scrollState) {        }        @Override      public void onScroll(AbsListView view, int firstVisibleItem,                           int visibleItemCount, int totalItemCount) {          // 滚动时到了最底部也可以加载更多          if (canLoad()) {              loadData();          }      }        /**       * 设置刷新       */      public static void setRefreshing(SwipeRefreshLayout refreshLayout,                                       boolean refreshing, boolean notify) {          Class<? extends SwipeRefreshLayout> refreshLayoutClass = refreshLayout                  .getClass();          if (refreshLayoutClass != null) {                try {                  Method setRefreshing = refreshLayoutClass.getDeclaredMethod(                          "setRefreshing", boolean.class, boolean.class);                  setRefreshing.setAccessible(true);                  setRefreshing.invoke(refreshLayout, refreshing, notify);              } catch (NoSuchMethodException e) {                  e.printStackTrace();              } catch (IllegalAccessException e) {                  e.printStackTrace();              } catch (InvocationTargetException e) {                  e.printStackTrace();              }          }      }        /**       * 加载更多的监听器       */      public static interface OnLoadListener {          public void onLoad();      }  }</pre>    <h3>3.自定义支持ViewPage的刷新组件VPSwipeRefreshLayout</h3>    <p style="text-align: center;"><img src="https://simg.open-open.com/show/b781468b5ee214ed8841faeed48c4a2e.png"></p>    <p style="text-align: center;">支持viewpager刷新</p>    <ul>     <li>原生SwipeRefreshLayout会存在以下问题：</li>    </ul>    <p>1、 SwipeRefreshLayout会吃掉ViewPager的滑动事件。</p>    <p>2、 SwipeRefreshLayout需要套在ScrollView和ListView上的时候才表现的比较友好，在其他ViewGroup上有点问题</p>    <ul>     <li>重写后的SwipeRefreshLayout，直接复制到项目就可以使用了。</li>    </ul>    <pre>  public class VpSwipeRefreshLayout extends SwipeRefreshLayout {    private float startY;  private float startX;  // 记录viewPager是否拖拽的标记  private boolean mIsVpDragger;  private final int mTouchSlop;    public VpSwipeRefreshLayout(Context context, AttributeSet attrs) {  super(context, attrs);  mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();  }    @Override  public boolean onInterceptTouchEvent(MotionEvent ev) {  int action = ev.getAction();  switch (action) {  case MotionEvent.ACTION_DOWN:  // 记录手指按下的位置  startY = ev.getY();  startX = ev.getX();  // 初始化标记  mIsVpDragger = false;  break;  case MotionEvent.ACTION_MOVE:  // 如果viewpager正在拖拽中，那么不拦截它的事件，直接return false；  if(mIsVpDragger) {  return false;  }    // 获取当前手指位置  float endY = ev.getY();  float endX = ev.getX();  float distanceX = Math.abs(endX - startX);  float distanceY = Math.abs(endY - startY);  // 如果X轴位移大于Y轴位移，那么将事件交给viewPager处理。  if(distanceX > mTouchSlop && distanceX > distanceY) {  mIsVpDragger = true;  return false;  }  break;  case MotionEvent.ACTION_UP:  case MotionEvent.ACTION_CANCEL:  // 初始化标记  mIsVpDragger = false;  break;  }  // 如果是Y轴位移大于X轴，事件交给swipeRefreshLayout处理。  return super.onInterceptTouchEvent(ev);  }  }</pre>    <h3>4.RecyclerView+SwpieRefreshLayout实现下拉刷新效果同时实现上拉功能</h3>    <p style="text-align: center;"><img src="https://simg.open-open.com/show/595d1770a98f117f61e02b742be44021.png"></p>    <p style="text-align: center;">RecyclerView+SwpieRefreshLayout</p>    <p>RecyclerView实现的列表，默认情况下面是不带下拉刷新和上拉记载更多效果的，但是我在我们的实际项目当中，为了提高用户体验，这种效果一般都需要实现</p>    <p>SwipeRefreshLayout本身自带下拉刷新的效果，那么我们可以选择在RecyclerView布局外部嵌套一层SwipeRefreshLayout布局即可，具体布局文件如下:</p>    <pre>  ?xml version="1.0" encoding="utf-8"?>  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"      xmlns:tools="http://schemas.android.com/tools"      android:id="@+id/activity_recycle_view_refresh"      android:layout_width="match_parent"      android:layout_height="match_parent"      android:orientation="vertical"        tools:context="com.hsy.refresh.ui.RecycleViewRefreshActivity">        <include          layout="@layout/common_top_bar_layout"          android:visibility="gone" />        <android.support.v4.widget.SwipeRefreshLayout          android:id="@+id/demo_swiperefreshlayout"          android:layout_width="fill_parent"          android:layout_height="fill_parent"          android:scrollbars="vertical">            <android.support.v7.widget.RecyclerView              android:id="@+id/demo_recycler"              android:layout_width="fill_parent"              android:layout_height="fill_parent">            </android.support.v7.widget.RecyclerView>      </android.support.v4.widget.SwipeRefreshLayout>  </LinearLayout></pre>    <p>在Activity中引用这个布局并初始化</p>    <pre>  @Override      protected void onCreate(Bundle savedInstanceState) {          //去除系统标题          this.requestWindowFeature(Window.FEATURE_NO_TITLE);          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_recycle_view_refresh);          ButterKnife.bind(this);            initView();      }        /*RecyclerView 管理器*/      private LinearLayoutManager linearLayoutManager;      MyRecyclerViewAdapter adapter;      private int lastVisibleItem;//记录滚动位置          /**       * 初始化组件       */      private void initView() {                 topBarTitle.setText("RecyclerView 刷新");            //设置刷新时动画的颜色，可以设置4个          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);          // 这句话是为了，第一次进入页面的时候显示加载进度条          swiperefreshLayout.setProgressViewOffset(false, 0, (int) TypedValue                  .applyDimension(TypedValue.COMPLEX_UNIT_DIP, 24, getResources()                          .getDisplayMetrics()));              //设置竖直方向          linearLayoutManager = new LinearLayoutManager(this);          linearLayoutManager.setOrientation(OrientationHelper.VERTICAL);          //设置管理器          recylerview.setLayoutManager(linearLayoutManager);          //添加分隔线          recylerview.addItemDecoration(new AdvanceDecoration(this, OrientationHelper.VERTICAL));            recylerview.setAdapter(adapter = new MyRecyclerViewAdapter(this));          /*实现下拉*/            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);/*添加数据*/                          swiperefreshLayout.setRefreshing(false);                          Toast.makeText(RecycleViewRefreshActivity.this, "更新了五条数据...", Toast.LENGTH_SHORT).show();                      }                  }, 3000);              }          });            /**           * 添加滚动监听，实现上拉刷新           */            recylerview.setOnScrollListener(new RecyclerView.OnScrollListener() {              @Override              public void onScrollStateChanged(RecyclerView recyclerView, int newState) {                  super.onScrollStateChanged(recyclerView, newState);                  //当滚动到底部时刷新数据                  if (newState == RecyclerView.SCROLL_STATE_IDLE && lastVisibleItem + 1 == adapter.getItemCount()) {                      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);                              swiperefreshLayout.setRefreshing(false);                            }                      }, 1000);                  }              }                @Override              public void onScrolled(RecyclerView recyclerView, int dx, int dy) {                  super.onScrolled(recyclerView, dx, dy);                  //获取滚动的最后位置                  lastVisibleItem = linearLayoutManager.findLastVisibleItemPosition();              }          });        }</pre>    <p>实现下拉刷新用SwipeRefreshLayout 自带的进度条， 上拉刷新用类似ListView的刷新 提示“加载中”等信息。</p>    <p>我们可以给RecyclerView 也添加一个类似FooterView的item。</p>    <p>我们在Adapter中实现：</p>    <pre>  /**       * RecyclerView的适配器       */        class MyRecyclerViewAdapter extends RecyclerView.Adapter<MyRecyclerViewAdapter.ViewHolder> {//自定义viewHoder          List<String> datas;          Context context;          /*加载更多*/          private static final int TYPE_ITEM = 0;          private static final int TYPE_FOOTER = 1;            public MyRecyclerViewAdapter(Context context) {              this.context = context;                /*初始化数据*/              this.datas = new ArrayList<String>();              for (int i = 0; i < 20; i++) {                  int index = i + 1;                  datas.add("item" + index);              }              /*addItem(datas);*/          }            //自定义的ViewHolder，持有每个Item的的所有界面元素          public class ViewHolder extends RecyclerView.ViewHolder {                public ViewHolder(View view) {                  super(view);              }          }              //自定义的ViewHolder，持有每个Item的的所有界面元素          public class ItemViewHolder extends ViewHolder {              public TextView item_tv;                public ItemViewHolder(View view) {                  super(view);                  item_tv = (TextView) view.findViewById(R.id.text);              }          }            /**           * 底部view           */            class FooterViewHolder extends ViewHolder {                public FooterViewHolder(View view) {                  super(view);              }            }            /**           * 绑定布局文件           *           * @param parent           * @param viewType           * @return           */          @Override          public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {              if (viewType == TYPE_FOOTER) {                  final View view = LayoutInflater.from(context).inflate(R.layout.refresh_footview_layout, parent, false);  //                view.setLayoutParams(new RecyclerView.LayoutParams(RecyclerView.LayoutParams.MATCH_PARENT,  //                        RecyclerView.LayoutParams.WRAP_CONTENT));                  FooterViewHolder viewHolder = new FooterViewHolder(view);                  return viewHolder;                } else if (viewType == TYPE_ITEM) {                    final View view = LayoutInflater.from(context).inflate(R.layout.item_recycler_layout, parent, false);                  //这边可以做一些属性设置，甚至事件监听绑定                  //view.setBackgroundColor(Color.RED);                  ItemViewHolder viewHolder = new ItemViewHolder(view);                  return viewHolder;              }              return null;          }            @Override          public void onBindViewHolder(ViewHolder holder, int position) {              if (holder instanceof ItemViewHolder) {                  //设置数据                  ((ItemViewHolder) holder).item_tv.setText(datas.get(position));                  ((ItemViewHolder) holder).item_tv.setTag(position);              }            }            /*返回每一项的类型*/          @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;              }          }            // RecyclerView的count设置为数据总条数+ 1（footerView）          @Override          public int getItemCount() {              return datas.size() + 1;          }            //添加数据            public void addItem(List<String> newDatas) {              //mTitles.add(position, data);              //notifyItemInserted(position);              newDatas.addAll(datas);              datas.removeAll(datas);              datas.addAll(newDatas);              notifyDataSetChanged();          }            /**           * 添加更多数据           *           * @param newDatas           */            public void addMoreItem(List<String> newDatas) {              datas.addAll(newDatas);              adapter.notifyDataSetChanged();          }      }</pre>    <p>refresh_footview_layout</p>    <pre>  <?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="wrap_content"      android:gravity="center_horizontal">        <ProgressBar          android:id="@+id/progressBar"          style="?android:attr/progressBarStyleSmall"          android:layout_width="wrap_content"          android:layout_height="wrap_content" />        <TextView          android:id="@+id/textView2"          android:layout_width="wrap_content"          android:layout_height="wrap_content"          android:text="@string/refresh_text" />  </LinearLayout></pre>    <p>item_recycler_layout</p>    <pre>  <?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="wrap_content">        <TextView          android:id="@+id/text"          android:layout_width="match_parent"          android:layout_height="match_parent" />    </LinearLayout></pre>    <p> </p>    <p> </p>    <p> </p>