4.5.2 SwipeRefreshLayout + RecyclerView 实现 上拉刷新 和 下拉刷新

我的思路是：1：重写一个继承了SwipeRefreshLayout的类的MySwipeRefreshLayout，使得这个MySwipeRefreshLayout，在拦截的方法onInterruptEvent里面添加一个判断，如果按下的地方在屏幕的上方的10分之一的地方拦截否则不拦截。2：将上面的MySwipeRefreshLayout添加到布局文件中3：给RecyclerView 添加一个

addOnScrollListener(new RecyclerView.OnScrollListener(){里面有两个方法onScrollStateChangedonScrolled}

mouge_lei_bie_detail_recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener(){/*** 在这个方法里面判断当前状态是不是SCROLL_STATE_IDLE，并且 最后一个可见的Item也就是lastVisibleItem* 是倒数第二个 数据 ，如果两个条件都满足，那么进行上拉加载的操作，就是发送一个 新的handle的消息。* 这个消息的what是ADD*/public void onScrollStateChanged(RecyclerView recyclerView, int newState) {super.onScrollStateChanged(recyclerView, newState);if(newState==RecyclerView.SCROLL_STATE_IDLE&&lastVisibleItem+1==adapter.getItemCount()){Message message = new Message();message.what=ADD;handler.sendMessage(message);}}/*** 通过recyclerView_layoutManager，这个recyclerView_layoutManager是通过下面的两句话来设置的* recyclerView_layoutManager = new LinearLayoutManager(this);* mouge_lei_bie_detail_recyclerView.setLayoutManager(recyclerView_layoutManager);* 得到最后一个可见的item的位置，并且把这个传递给变量lastVisibleItem ，*/public void onScrolled(RecyclerView recyclerView, int dx, int dy) {super.onScrolled(recyclerView, dx, dy);lastVisibleItem = recyclerView_layoutManager.findLastVisibleItemPosition();}});

参考：/article/2019663.html

SwipeRefreshLayout + RecyclerView 实现 上拉刷新 和 下拉刷新

版权声明：本文为博主原创文章，未经博主允许不得转载。SwipeRefreshLayout 是谷歌公司推出的用于下拉刷新的控件，SwipeRefreshLayout已经被放到了sdk中，在Version19.1之后SwipeRefreshLayout 被放到supportv4中。源码在SDK\sdk\extras\android\support\v4\src\java\android\support\v4\widget\SwipeRefreshLayout.java谷歌公司只提供了下拉刷新的功能，RecyclerView的出现基本就是为了替代ListView，GridView的。今天说一下最常见的下拉刷新 和 上拉刷新的功能。布局文件：[html] viewplaincopy<android.support.v4.widget.SwipeRefreshLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:id="@+id/swipe_refresh_widget"android:layout_width="match_parent"android:layout_height="match_parent" ><android.support.v7.widget.RecyclerViewandroid:id="@android:id/list"android:layout_width="match_parent"android:layout_height="match_parent"android:cacheColorHint="@null"android:scrollbars="vertical" /></android.support.v4.widget.SwipeRefreshLayout>在Activity中引用这个布局并初始化[java] viewplaincopy@Overrideprotected 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() {@Overridepublic 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);}}@Overridepublic 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);}SwipeRefreshLayout里面需要注意的Api：1、setOnRefreshListener(OnRefreshListener listener)设置下拉监听，当用户下拉的时候会去执行回调2、setColorSchemeColors(int... colors) 设置 进度条的颜色变化，最多可以设置4种颜色3、setProgressViewOffset(boolean scale, int start, int end) 调整进度条距离屏幕顶部的距离4、setRefreshing(boolean refreshing) 设置SwipeRefreshLayout当前是否处于刷新状态，一般是在请求数据的时候设置为true，在数据被加载到View中后，设置为false。RecyclerView的实现：第一种，下拉刷新和上拉刷新都用SwipeRefreshLayout 自带的进度条[java] viewplaincopymRecyclerView = (RecyclerView) findViewById(android.R.id.list);mRecyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() {@Overridepublic 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);}}@Overridepublic 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);第二种实现下拉刷新用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。我们可以给RecyclerView 也添加一个类似FooterView的item。我们在Adapter中实现：[java] viewplaincopypublic class SampleAdapter extends RecyclerView.Adapter<ViewHolder> {private List<Integer> list;private static final int TYPE_ITEM = 0;private static final int TYPE_FOOTER = 1;public List<Integer> getList() {return list;}public SampleAdapter() {list = new ArrayList<Integer>();}// RecyclerView的count设置为数据总条数+ 1（footerView）@Overridepublic int getItemCount() {return list.size() + 1;}@Overridepublic int getItemViewType(int position) {// 最后一个item设置为footerViewif (position + 1 == getItemCount()) {return TYPE_FOOTER;} else {return TYPE_ITEM;}}@Overridepublic void onBindViewHolder(ViewHolder holder, final int position) {if (holder instanceof ItemViewHolder) {((ItemViewHolder) holder).textView.setText(String.valueOf(list.get(position)));}}@Overridepublic 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footerViewelse 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);}}}这样我们就可以针对footerview的布局做一些处理了，比如提示“加载中，”，“已经全部加载”等信息。更加灵活一点