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为了更好的学习和工作，动动小手收藏起来吧！ 分享一个谷歌自带的下拉刷新和上拉加载更多例子: 效果图：
自定义RefreshLayout继承 SwipeRefreshLayout /** * 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(); } } 新建一个Activitiy public class MainActivity extends Activity implements OnRefreshListener, OnLoadListener { private RefreshLayout swipeLayout; private ListView listView; private MyAdapter adapter; private ArrayList<HashMap<String, String>> list; private View header; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); setData(); setListener(); /*设置自动刷新 swipeLayout.setRefreshing(true); 在 setRefreshing(true)并没有触发onRefresh的,须要手动调用一次 */ // swipeLayout.post(new Thread(new Runnable() { // @Override // public void run() { // swipeLayout.setRefreshing(true); // } // })); // onRefresh(); } /** * 初始化布局 */ @SuppressLint({ "InlinedApi", "InflateParams" }) private void initView() { header = getLayoutInflater().inflate(R.layout.header, null); swipeLayout = (RefreshLayout) findViewById(R.id.swipe_container); swipeLayout.setColorSchemeResources(R.color.color_bule2,R.color.color_bule,R.color.color_bule2,R.color.color_bule3); } /** * 添加数据 */ private void setData() { list = new ArrayList<HashMap<String, String>>(); for (int i = 0; i < 10; i++) { HashMap<String, String> map = new HashMap<String, String>(); map.put("itemImage", i+"默认"); map.put("itemText", i+"默认"); list.add(map); } listView = (ListView) findViewById(R.id.list); listView.addHeaderView(header); adapter = new MyAdapter(this, list); listView.setAdapter(adapter); } /** * 设置监听 */ private void setListener() { swipeLayout.setOnRefreshListener(this); 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); } 简单自定义一个Adapter适配器继承于BaseAdapter public class MyAdapter extends BaseAdapter { public ArrayList<HashMap<String, String>> list; public Context context; public LayoutInflater layoutInflater; public MyAdapter(Context context, ArrayList<HashMap<String, String>> list) { this.context = context; this.list = list; layoutInflater = LayoutInflater.from(context); } @Override public int getCount() { return list.size(); } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { View view = null; ViewHolder holder = null; if (convertView == null) { view = layoutInflater.inflate(R.layout.item, null); holder = new ViewHolder(); holder.txt =(TextView) view.findViewById(R.id.textView1); view.setTag(holder); } else { view = convertView; holder = (ViewHolder) view.getTag(); } holder.txt.setText(list.get(position).get("itemText")); return view; } static class ViewHolder {
TextView txt; } } 源码下载地址，请回复 刷新 即可 |
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