android 安卓 listview 支持下拉刷新上拉加载更多 _下拉刷新

犀渠玉剑良家子，白马金羁侠少年。这篇文章主要讲述android 安卓 listview 支持下拉刷新上拉加载更多相关的知识，希望能为你提供帮助。
【1】重写listView

import java.text.SimpleDateFormat; import java.util.Date; import android.content.Context; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.view.animation.Animation; import android.view.animation.LinearInterpolator; import android.view.animation.RotateAnimation; import android.widget.AbsListView; import android.widget.AbsListView.OnScrollListener; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.ProgressBar; import android.widget.TextView; public class RefreshListView extends ListView implements OnScrollListener { private static final int DONE = 0; private static final int PULL_TO_REFRESH = 1; private static final int RELEASE_TO_REFRESH = 2; private static final int REFRESHING = 3; private static final float RATIO = 3; // 用来设置实际间距和上边距之间的比例 private int state; // 当前下拉刷新的状态 private int firstVisibleIndex; // 在listview中第一个可以看见的item private View headView; private ImageView headArrow; private ProgressBar progressBar; private TextView headTitle; private TextView headLastUpdate; private int headContentWidth; private int headContentHeight; private Animation animation; private Animation reverseAnimation; private OnRefreshListner refreshListner; // 刷新监听器 private boolean isRefreshable; private boolean isRecored = false; // 用来记录第一次按下坐标点,在整个滑动的过程中只记录一次 private float startY; private boolean isBack = false; // 是从松开刷新状态来到的下拉刷新状态 public RefreshListView(Context context, AttributeSet attrs) { super(context, attrs); init(context); } private void init(Context context) { // listview 设置滑动时缓冲背景色 setCacheColorHint(0x00000000); headView = View.inflate(context, R.layout.listview_header, null); headArrow = (ImageView) headView.findViewById(R.id.iv_listview_header_arrow); progressBar = (ProgressBar) headView.findViewById(R.id.pb_listview_header); headTitle = (TextView) headView.findViewById(R.id.tv_listview_header_last_update_time); headLastUpdate = (TextView) headView .findViewById(R.id.tv_listview_header_state); headArrow.setMinimumWidth(50); headArrow.setMinimumHeight(70); MeasureView(headView); headContentWidth = headView.getMeasuredWidth(); headContentHeight = headView.getMeasuredHeight(); headView.setPadding(0, -1*headContentHeight, 0, 0); // 为listView加入顶部View addHeaderView(headView); setOnScrollListener(this); animation = new RotateAnimation(-180, 0, Animation.RELATIVE_TO_SELF,0.5f, Animation.RELATIVE_TO_SELF, 0.5f); animation.setDuration(250); animation.setFillAfter(true); // 设定动画结束时，停留在动画结束位置 (保留动画效果) animation.setInterpolator(new LinearInterpolator()); // 匀速变化 reverseAnimation = new RotateAnimation(0, -180,Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,0.5f); reverseAnimation.setDuration(200); reverseAnimation.setFillAfter(true); // 设定动画结束时，停留在动画结束位置 (保留动画效果) reverseAnimation.setInterpolator(new LinearInterpolator()); // 匀速变化 // 设置当前headView的状态 state = DONE; // 设置当前下拉刷新是否可用 isRefreshable = false; } /** * 测量headView的宽高 */ private void MeasureView(View child) { ViewGroup.LayoutParams lp = child.getLayoutParams(); if (null == lp) { lp = new ViewGroup.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT); } int measureChildWidth = ViewGroup.getChildMeasureSpec(0, 0, lp.width); int measureChildHeight; if (lp.height > 0) { measureChildHeight = MeasureSpec.makeMeasureSpec(lp.height, MeasureSpec.EXACTLY); } else { measureChildHeight = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); } child.measure(measureChildWidth, measureChildHeight); } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: if (firstVisibleIndex == 0 & & !isRecored) { startY = event.getY(); isRecored = true; } break; case MotionEvent.ACTION_MOVE: float tempY = event.getY(); if (firstVisibleIndex == 0 & & !isRecored) { startY = tempY; isRecored = true; } if (state != REFRESHING) { if (state == PULL_TO_REFRESH) { // 向下拉了从下拉刷新的状态来到松开刷新的状态 if ((tempY - startY) / RATIO > = headContentHeight & & (tempY - startY) > 0) { state = RELEASE_TO_REFRESH; changeHeadViewOfState(); } // 向上推了从下拉刷新的状态来到刷新完成的状态 else if ((tempY - startY) < = 0) { state = DONE; changeHeadViewOfState(); } } else if (state == RELEASE_TO_REFRESH) { // 向上推了还没有完全将HEADVIEW 隐藏掉（可以看到一部分） // 从松开刷新的状态来到下拉刷新的状态 if ((tempY - startY) / RATIO < headContentHeight & & (tempY - startY) > 0) { state = PULL_TO_REFRESH; changeHeadViewOfState(); isBack = true; } // 向上推了一下子推到了最上面从松开刷新的状态来到刷新完成的状态（数据不刷新的） else if ((tempY - startY) < = 0) { state = DONE; changeHeadViewOfState(); } } else if (state == DONE) { // 刷新完成的状态来到下拉刷新的状态 if ((tempY - startY) > 0) { state = PULL_TO_REFRESH; changeHeadViewOfState(); } } if (state == PULL_TO_REFRESH) { headView.setPadding(0,(int) ((tempY - startY) / RATIO - headContentHeight),0, 0); } if (state == RELEASE_TO_REFRESH) { headView.setPadding(0, (int) ((tempY - startY) / RATIO - headContentHeight),0, 0); } } break; case MotionEvent.ACTION_UP: if (state != REFRESHING) { if (state == PULL_TO_REFRESH) { // 松手 state = DONE; changeHeadViewOfState(); } else if (state == RELEASE_TO_REFRESH) { // 松手 state = REFRESHING; changeHeadViewOfState(); // 执行数据刷新方法 onRefresh(); } } isRecored = false; isBack = false; break; } return super.onTouchEvent(event); } /** * 执行下拉刷新 */ private void onRefresh() { if (refreshListner != null) { refreshListner.onRefresh(); } } /** * HeadView的状态变化效果 */ private void changeHeadViewOfState() { switch (state) { case PULL_TO_REFRESH: headArrow.setVisibility(View.VISIBLE); progressBar.setVisibility(View.GONE); headTitle.setVisibility(View.VISIBLE); headLastUpdate.setVisibility(View.VISIBLE); headArrow.clearAnimation(); headTitle.setText("下拉可以刷新"); //由松开刷新到下拉刷新 if(isBack){ headArrow.startAnimation(animation); isBack = false; } break; case RELEASE_TO_REFRESH: headArrow.setVisibility(View.VISIBLE); progressBar.setVisibility(View.GONE); headTitle.setVisibility(View.VISIBLE); headLastUpdate.setVisibility(View.VISIBLE); headArrow.clearAnimation(); headArrow.startAnimation(reverseAnimation); headTitle.setText("松开可以刷新"); break; case REFRESHING: headArrow.setVisibility(View.GONE); progressBar.setVisibility(View.VISIBLE); headTitle.setVisibility(View.VISIBLE); headLastUpdate.setVisibility(View.VISIBLE); headArrow.clearAnimation(); headTitle.setText("正在刷新..."); headView.setPadding(0, 0, 0, 0); break; case DONE: headArrow.setVisibility(View.VISIBLE); progressBar.setVisibility(View.GONE); headTitle.setVisibility(View.VISIBLE); headLastUpdate.setVisibility(View.VISIBLE); headArrow.clearAnimation(); headTitle.setText("下拉可以刷新"); headView.setPadding(0, -1 * headContentHeight, 0, 0); break; } } private int lastPos; //最后一个可见的item的位置 private int count; //item总数,注意不是当前可见的item总数 private boolean hasFoot = false; //是否有了Foot public void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) { firstVisibleIndex = firstVisibleItem; lastPos = getLastVisiblePosition(); count = totalItemCount; //因为刚进入的时候,lastPos=-1,count=0,这个时候不能让它执行onAddFoot方法 if(lastPos==count-1 & & !hasFoot & & lastPos != -1){ hasFoot = true; onAddFoot(); } } public void onScrollStateChanged(AbsListView view, int scrollState) { if(isFootLoading) return; if(hasFoot & & scrollState==SCROLL_STATE_IDLE){ isFootLoading = true; onFootLoading(); } } /** * 设置下拉刷新监听 */ public void setOnRefreshListner(OnRefreshListner listener) { // 设置下拉刷新可用 isRefreshable = true; refreshListner = listener; } //执行底部加载 public void onFootLoading(){ if(footLoadingListener!=null & & isFootLoading) footLoadingListener.onFootLoading(); } public void setOnAddFootListener(OnAddFootListener addFootListener){ onAddFootListener = addFootListener; } //执行添加foot public void onAddFoot(){ if(onAddFootListener!=null & & hasFoot) onAddFootListener.addFoot(); } //是否添加Foot的监听器,如果写在OnFootLoadingListener中会有延迟,效果不好 //应该是先进入添加Foot的状态,再进入FootLoading的状态 public OnAddFootListener onAddFootListener; //是否进入从底部加载数据的状态的监听器 public OnFootLoadingListener footLoadingListener; //正在加载底部数据 private boolean isFootLoading = false; public void setOnFootLoadingListener(OnFootLoadingListener footLoading){ footLoadingListener = footLoading; } /** * 下拉刷新监听器 */ public interface OnRefreshListner { // 下拉刷新的时候,在这里执行获取数据的过程 void onRefresh(); } /** * 上拉刷新监听器 */ public interface OnFootLoadingListener{ // 这里是执行后台获取数据的过程 void onFootLoading(); } /** * 添加Foot的监听器 */ public interface OnAddFootListener{ // 这里是用户addFootView的操作 void addFoot(); } /** * 底部数据加载完成,用户需要加入一个removeFootView的操作 */ public void onFootLoadingComplete(){ hasFoot = false; isFootLoading = false; } /** * 上拉刷新完成时所执行的操作,更改状态,隐藏head */ public void onRefreshComplete() { state = DONE; changeHeadViewOfState(); headLastUpdate.setText("最后刷新时间： " + new Date().toLocaleString()); } @Override public void setAdapter(ListAdapter adapter) { headLastUpdate.setText("最后刷新时间： " + new Date().toLocaleString()); super.setAdapter(adapter); } }

【2】下拉刷新头部布局文件listview_header.xml

< ?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:orientation="horizontal" > < FrameLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="10dip" > < ImageView android:id="@+id/iv_listview_header_arrow" android:layout_width="40dp" android:layout_height="40dp" android:layout_gravity="center" android:minWidth="30dip" android:src="https://www.songbingjia.com/android/@drawable/arrow" /> < ProgressBar android:id="@+id/pb_listview_header" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:indeterminateDrawable="@drawable/common_progressbar" android:visibility="gone" /> < /FrameLayout> < LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:gravity="center_horizontal" android:orientation="vertical" > < TextView android:id="@+id/tv_listview_header_state" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="下拉刷新" android:textColor="#FF0000" android:textSize="18sp" /> < TextView android:id="@+id/tv_listview_header_last_update_time" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="5dip" android:text="最后刷新时间: 2014-10-10 12:56:12" android:textColor="@android:color/white" android:textSize="14sp" /> < /LinearLayout> < /LinearLayout>

【3】上拉加载更多布局文件listview_footer.xml

< ?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:orientation="vertical" > < LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:layout_margin="10dip" android:gravity="center_vertical" android:orientation="horizontal" > < ProgressBar android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:indeterminateDrawable="@drawable/common_progressbar" /> < TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="10dip" android:text="加载更多..." android:textColor="#FF0000" android:textSize="18sp" /> < /LinearLayout> < /LinearLayout>

【4】progressBar--common_progressbar.xml

< ?xml version="1.0" encoding="utf-8"?> < rotate xmlns:android="http://schemas.android.com/apk/res/android" android:fromDegrees="0" android:pivotX="50%" android:pivotY="50%" android:toDegrees="360" > < shape android:innerRadiusRatio="3" android:shape="ring" android:useLevel="false" > < gradient android:centerColor="#FF6666" android:endColor="#FF0000" android:startColor="#FFFFFF" android:type="sweep" /> < /shape> < /rotate>

【5】使用方法

adapter=new myListAdapter(items,xxx.this); listView.setAdapter(adapter); /** * 下拉刷新回调 */ listView.setOnRefreshListner(new OnRefreshListner() { public void onRefresh() { new AsyncTask< Void, Void, ArrayList< String> > (){ @Override protected ArrayList< String> doInBackground(Void... params) { try { //模拟从服务器获取数据的过程 Thread.sleep(1500); } catch (InterruptedException e) { e.printStackTrace(); } return null; } //更新UI的方法,系统自动实现 @Override protected void onPostExecute(ArrayList< String> result) { data.addAll(0,result); //注意是往前添加数据 adapter.notifyDataSetChanged(); listView.onRefreshComplete(); //完成下拉刷新,这个方法要调用 super.onPostExecute(result); } }.execute(); } }); //上拉加载更多功能 final View footer = View.inflate(getActivity(), R.layout.listview_footer, null); listView.setOnAddFootListener(new OnAddFootListener() { public void addFoot() { listView.addFooterView(footer); } }); listView.setOnFootLoadingListener(new OnFootLoadingListener() { public void onFootLoading() { new AsyncTask< Void, Void, ArrayList< String> > (){ @Override protected ArrayList< String> doInBackground(Void... params) { try { //模拟从服务器获取数据的过程 Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } return null; } //在doInBackground后面执行 protected void onPostExecute(ArrayList< String> result) { data.addAll(result); //这个是往后添加数据 adapter.notifyDataSetChanged(); listView.onFootLoadingComplete(); //完成上拉刷新,就是底部加载完毕,这个方法要调用 //移除footer,这个动作不能少 listView.removeFooterView(footer); super.onPostExecute(result); } }.execute(); } });

【6】注意事项
listview设置项目点击事件
【android 安卓 listview 支持下拉刷新上拉加载更多】listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView< ?> parent, View view,int position, long id) {
if(position==0||position==items.length()+1) return;
//获取每项的数据，position需减1，第0项为listview_head
}