1.添加加载更多布局

1_初始化和隐藏代码

在RefreshListView构造方法中调用

private void initFooterView(Context context) { View footerView = View.inflate(context, R.layout.refresh_listview_footer, null); //隐藏代码 footerView.measure(0, 0); int footerViewHeight = footerView.getMeasuredHeight(); footerView.setPadding(0, -footerViewHeight, 0, 0); this.addFooterView(footerView); }

2_布局文件refresh_listview_footer.xml

<"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" android:orientation="horizontal" > <ProgressBar android:layout_margin="5dip" android:layout_width="wrap_content" android:layout_height="wrap_content" android:indeterminateDrawable="@drawable/custom_progressbar" /> <TextView android:layout_marginLeft="10dip" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="加载更多中..." android:textColor="#ff0000" android:textSize="25sp" /> </LinearLayout>

2.拖动到底部的时候

/** * 菜单页面对应的新闻页签页面 * 总共有12个 * @author Administrator * */ public class TabMenuDetailPager extends MenuDetailBasePagerimplements OnPageChangeListener { /** * 新闻中心-新闻菜单对应的标签对应的数据 */ private NewCenterTag newCenterTag; ....................... /** * 加载更多数据的URL */ private String moreUrl; /** * 是否加载更多数据中 */ protected boolean isLoadingMore = false; ................... @Override public View initView() { View view = View.inflate(mActivity, R.layout.tab_detail, null); //把View注入到XUtils框架中 ViewUtils.inject(this, view); .......................... //设置监听下拉刷新 mListView.setOnRefreshListener(new OnRefreshListener() { @Override public void onPullDownRefresh() { isPullDownRefreshing = true; getDataFromNet(); } @Override public void onLoadingMore() { if(TextUtils.isEmpty(moreUrl)){ Toast.makeText(mActivity, "没有更多数据了", 1).show(); mListView.onRefreshFinish(false); }else{ //有更多数据，要加载更多数据了 getMoreDataFromNet(); } } }); return view; } /** * 加载更多数据 */ protected void getMoreDataFromNet() { HttpUtils httpUtils = new HttpUtils(); httpUtils.send(HttpMethod.GET, moreUrl, new RequestCallBack<String>() { @Override public void onSuccess(ResponseInfo<String> responseInfo) { System.out.println("加载更多数据成功："+responseInfo.result); mListView.onRefreshFinish(false); isLoadingMore = true; processData(responseInfo.result); } @Override public void onFailure(HttpException error, String msg) { mListView.onRefreshFinish(false); System.out.println("加载更多数据失败："+ msg); } }); } /** * 处理和解析json数据 * @param json */ protected void processData(String json) { TabDetailBean bean = parserJson(json); if(!isLoadingMore){ System.out.println(bean.data.news.get(0).title); topnews = bean.data.topnews; //给ViewPager设置适配器 TabDetailAdapter adapter = new TabDetailAdapter(); mViewPager.setAdapter(adapter); // 把所有的View清除 ll_point_group.removeAllViews(); for(int i=0;i<topnews.size();i++){ View point = new View(mActivity); LayoutParams params = new LayoutParams(5, 5) ; point.setBackgroundResource(R.drawable.tab_detail_point_bg); if(i!=0){ params.leftMargin = 10; } point.setEnabled(false); point.setLayoutParams(params); ll_point_group.addView(point); } previousPointPosition = 0; //设置默认的图片描述和指示点 mtv_title_description.setText(topnews.get(previousPointPosition).title); ll_point_group.getChildAt(previousPointPosition).setEnabled(true); //设置页面改变的监听 mViewPager.setOnPageChangeListener(this); //设置适配器和对应的数据 newsLists = bean.data.news; listViewAdapter = new ListViewAdapter(); mListView.setAdapter(listViewAdapter); // mListView.addHeaderView(v) ;//把一个视图一头的方式添加到ListView中 }else{ //把列表新闻取出来，在加载到以前的集合中，在刷新数据 isLoadingMore = false; List<News>moreDataNews = bean.data.news; newsLists.addAll(moreDataNews); listViewAdapter.notifyDataSetChanged();//刷新数据 } } ................ /** * 用Gson开源项目解析json * @param json */ private TabDetailBean parserJson(String json) { Gson gson = new Gson(); TabDetailBean bean = gson.fromJson(json, TabDetailBean.class); moreUrl = bean.data.more; if(TextUtils.isEmpty(moreUrl)){ moreUrl = null; }else{ moreUrl = ConstantUtils.server_url+moreUrl; } return bean; } @Override public void onPageScrollStateChanged(int arg0) { // TODO Auto-generated method stub } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { // TODO Auto-generated method stub } ............... }

3.完整代码

package com.atguigu.refreshlistview; import android.content.Context; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; import android.view.animation.Animation; import android.view.animation.RotateAnimation; import android.widget.AbsListView; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.ProgressBar; import android.widget.TextView; import java.text.SimpleDateFormat; import java.util.Date; /** * 作用：自定义下拉刷新的ListView */ public class RefreshListview extends ListView { /** * 下拉刷新和顶部轮播图 */ private LinearLayout headerView; /** * 下拉刷新控件 */ private View ll_pull_down_refresh; private ImageView iv_arrow; private ProgressBar pb_status; private TextView tv_status; private TextView tv_time; /** * 下拉刷新控件的高 */ private int pullDownRefreshHeight; /** * 下拉刷新 */ public static final int PULL_DOWN_REFRESH = 0; /** * 手松刷新 */ public static final int RELEASE_REFRESH = 1; /** * 正在刷新 */ public static final int REFRESHING = 2; /** * 当前状态 */ private int currentStatus = PULL_DOWN_REFRESH; private Animation upAnimation; private Animation downAnimation; /** * 加载更多的控件 */ private View footerView; /** * 加载更多控件高 */ private int footerViewHeight; /** * 是否已经加载更多 */ private boolean isLoadMore = false; /** * 顶部轮播图部分 */ private View topNewsView; /** * ListView在Y轴上的坐标 */ private int listViewOnScreenY = -1; public RefreshListview(Context context) { this(context, null); } public RefreshListview(Context context, AttributeSet attrs) { this(context, attrs, 0); } public RefreshListview(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initHeaderView(context); initAnimation(); initFooterView(context); } private void initFooterView(Context context) { footerView = View.inflate(context, R.layout.refresh_footer, null); footerView.measure(0, 0); footerViewHeight = footerView.getMeasuredHeight(); footerView.setPadding(0, -footerViewHeight, 0, 0); //ListView添加footer addFooterView(footerView); //监听ListView的滚动 setOnScrollListener(new MyOnScrollListener()); } /** * 添加顶部轮播图 * @param topNewsView */ public void addTopNewsView(View topNewsView) { if(topNewsView != null){ this.topNewsView =topNewsView; headerView.addView(topNewsView); } } class MyOnScrollListener implements OnScrollListener{ @Override public void onScrollStateChanged(AbsListView view, int scrollState) { //当静止或者惯性滚动的时候 if(scrollState ==OnScrollListener.SCROLL_STATE_IDLE||scrollState ==OnScrollListener.SCROLL_STATE_FLING){ //并且是最后一条可见 if(getLastVisiblePosition()>=getCount()-1){ //1.显示加载更多布局 footerView.setPadding(8,8,8,8); //2.状态改变 isLoadMore = true; //3.回调接口 if(mOnRefreshListener != null){ mOnRefreshListener.onLoadMore(); } } } } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { } } private void initAnimation() { upAnimation = new RotateAnimation(0, -180, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f); upAnimation.setDuration(500); upAnimation.setFillAfter(true); downAnimation = new RotateAnimation(-180, -360, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f); downAnimation.setDuration(500); downAnimation.setFillAfter(true); } private void initHeaderView(Context context) { headerView = (LinearLayout) View.inflate(context, R.layout.refresh_header, null); //下拉刷新控件 ll_pull_down_refresh = headerView.findViewById(R.id.ll_pull_down_refresh); iv_arrow = (ImageView) headerView.findViewById(R.id.iv_arrow); pb_status = (ProgressBar) headerView.findViewById(R.id.pb_status); tv_status = (TextView) headerView.findViewById(R.id.tv_status); tv_time = (TextView) headerView.findViewById(R.id.tv_time); //测量 ll_pull_down_refresh.measure(0, 0); pullDownRefreshHeight = ll_pull_down_refresh.getMeasuredHeight(); //默认隐藏下拉刷新控件 // View.setPadding(0,-控件高，0,0);//完全隐藏 //View.setPadding(0, 0，0,0);//完全显示 ll_pull_down_refresh.setPadding(0, -pullDownRefreshHeight, 0, 0); //添加ListView的头 addHeaderView(headerView); } private float startY = -1; @Override public boolean onTouchEvent(MotionEvent ev) { switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: //1.记录起始坐标 startY = ev.getY(); break; case MotionEvent.ACTION_MOVE: if (startY == -1) { startY = ev.getY(); } //判断顶部轮播图是否完全显示，只有完全显示才会有下拉刷新 boolean isDisplayTopNews = isDisplayTopNews(); if(!isDisplayTopNews){ //加载更多 break; } //如果是正在刷新，就不让再刷新了 if (currentStatus == REFRESHING) { break; } //2.来到新的坐标 float endY = ev.getY(); //3.记录滑动的距离 float distanceY = endY - startY; if (distanceY > 0) {//下拉 //int paddingTop = -控件高 + distanceY; int paddingTop = (int) (-pullDownRefreshHeight + distanceY); if (paddingTop < 0 && currentStatus != PULL_DOWN_REFRESH) { //下拉刷新状态 currentStatus = PULL_DOWN_REFRESH; //更新状态 refreshViewState(); } else if (paddingTop > 0 && currentStatus != RELEASE_REFRESH) { //手松刷新状态 currentStatus = RELEASE_REFRESH; //更新状态 refreshViewState(); } ll_pull_down_refresh.setPadding(0, paddingTop, 0, 0); //View.setPadding(0,paddingTop，0,0);//动态的显示下拉刷新控件 } break; case MotionEvent.ACTION_UP: startY = -1; if (currentStatus == PULL_DOWN_REFRESH) { // View.setPadding(0,-控件高，0,0);//完全隐藏 ll_pull_down_refresh.setPadding(0, -pullDownRefreshHeight, 0, 0); } else if (currentStatus == RELEASE_REFRESH) { //设置状态为正在刷新 currentStatus = REFRESHING; refreshViewState(); // View.setPadding(0,0，0,0);//完全显示 ll_pull_down_refresh.setPadding(0, 0, 0, 0); //回调接口 if (mOnRefreshListener != null) { mOnRefreshListener.onPullDownRefresh(); } } break; } return super.onTouchEvent(ev); } /** * 判断是否完全显示顶部轮播图 * 当ListView在屏幕上的Y轴坐标小于或者等于顶部轮播图在Y轴的坐标的时候，顶部轮播图完全显示 * @return */ private boolean isDisplayTopNews() { if(topNewsView != null){ //1.得到ListView在屏幕上的坐标 int[] location = new int[2]; if(listViewOnScreenY == -1){ getLocationOnScreen(location); listViewOnScreenY = location[1]; } //2.得到顶部轮播图在屏幕上的坐标 topNewsView.getLocationOnScreen(location); int topNewsViewOnScreenY = location[1]; // if(listViewOnScreenY <= topNewsViewOnScreenY){ // return true; // }else{ // return false; // } return listViewOnScreenY <= topNewsViewOnScreenY; }else{ return true; } } private void refreshViewState() { switch (currentStatus) { case PULL_DOWN_REFRESH://下拉刷新状态 iv_arrow.startAnimation(downAnimation); tv_status.setText("下拉刷新..."); break; case RELEASE_REFRESH://手松刷新状态 iv_arrow.startAnimation(upAnimation); tv_status.setText("手松刷新..."); break; case REFRESHING://正在刷新状态 tv_status.setText("正在刷新..."); pb_status.setVisibility(VISIBLE); iv_arrow.clearAnimation(); iv_arrow.setVisibility(GONE); break; } } /** * 当联网成功和失败的时候回调该方法 * 用户刷新状态的还原 * * @param sucess */ public void onRefreshFinish(boolean sucess) { if(isLoadMore){ //加载更多 isLoadMore = false; //隐藏加载更多布局 footerView.setPadding(0,-footerViewHeight,0,0); }else{ //下拉刷新 tv_status.setText("下拉刷新..."); currentStatus = PULL_DOWN_REFRESH; iv_arrow.clearAnimation(); pb_status.setVisibility(GONE); iv_arrow.setVisibility(VISIBLE); //隐藏下拉刷新控件 ll_pull_down_refresh.setPadding(0, -pullDownRefreshHeight, 0, 0); if (sucess) { //设置最新更新时间 tv_time.setText("上次更新时间：" + getSystemTime()); } } } /** * 得到当前Android系统的时间 * * @return */ private String getSystemTime() { SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); return format.format(new Date()); } /** * 监听控件的刷新 */ public interface OnRefreshListener { /** * 当下拉刷新的时候回调这个方法 */ public void onPullDownRefresh(); /** 当加载更多的时候回调这个方法 */ public void onLoadMore(); } private OnRefreshListener mOnRefreshListener; /** * 设置监听刷新，由外界设置 */ public void setOnRefreshListener(OnRefreshListener l) { this.mOnRefreshListener = l; } }

以上所述是小编给大家介绍的Android 仿硅谷新闻下拉刷新/上拉加载更多，希望对大家有所帮助，如果大家有任何疑问请给我们留言，小编会及时回复大家的。在此也非常感谢大家对查字典教程网的支持！