ListView上拉加载下拉刷新
来源：互联网 发布：数控加工中心编程教材 编辑：程序博客网 时间：2024/05/22 11:56
主要用到了这个几个文件，MainActivity是界面的Activity,MyAdapter是ListView的自定义适配,MyListView是自定义带头部LIistView，如果只需要上拉加载就不需要；activity_main.xml是住界面，item.xml是ListView的子布局里面只有一个TextView,listview_footer.xml是listview的加载更多的底部布局，listview_header.xml是listview的头部布局。
MainActivity.java
package com.example.listview;import java.util.ArrayList;import java.util.List;import android.annotation.SuppressLint;import android.app.Activity;import android.os.AsyncTask;import android.os.Bundle;import android.os.Handler;import android.view.LayoutInflater;import android.view.View;import android.widget.AbsListView;import android.widget.AbsListView.OnScrollListener;import android.widget.Toast;import com.example.listview.MyListView.OnRefreshListener;public class MainActivity extends Activity implements OnScrollListener{/** ListView*/private MyListView listView;/** 自定义的Adapter*/private MyAdapter adapter;/** 一共的数据*/private List<String> list=new ArrayList<String>();/** ListView的底部布局*/private View footer;private Handler handler; private int count=0;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);/** 配置好ListView*/listView=(MyListView) findViewById(R.id.listView);/** 添加底部布局,要在setAdapter前,否则没有效果*/footer=LayoutInflater.from(this).inflate(R.layout.listview_footer, null);listView.addFooterView(footer);/** 适配listView*/adapter=new MyAdapter(this, list);listView.setAdapter(adapter);/** 添加一个线程设置时间有等待的效果*/handler=new Handler();listView.setOnScrollListener(this);listView.setonRefreshListener(new OnRefreshListener() { @Override public void onRefresh() { new AsyncTask<Void, Void, Void>() { protected Void doInBackground(Void... params) { try { Thread.sleep(1000); } catch (Exception e) { e.printStackTrace(); } // list.add("刷新后添加的内容"); return null; } @Override protected void onPostExecute(Void result) { adapter.notifyDataSetChanged(); listView.onRefreshComplete(); } }.execute(null, null, null); } }); setData(); }/** * 底部滚动的监听 */@Overridepublic void onScrollStateChanged(final AbsListView view, int scrollState) {/** 当滚动停止同时在底部的时候*/ if (scrollState == OnScrollListener.SCROLL_STATE_IDLE && (view.getLastVisiblePosition() == view.getCount() - 1)) { /** 为了有数据加载等待的时间，如果是网络数据请求，则此处不需要直接请求接口就ok*/ handler.postDelayed(new Runnable() { @Override public void run() { setData(); /** 让刷新出来的数据从屏幕开始显示,如果不设定位置，listView数据更新后会跑到第一条数据开始显示*/ listView.setSelection(view.getCount()-1); } }, 2000); } }@Overridepublic void onScroll(AbsListView arg0, int arg1, int arg2, int arg3) {}/** 放数据,如果你的数据可以分页获取就不需要这样,此处是为了有分页的数据*/@SuppressLint("ShowToast")private void setData(){//当数据到达总量的时候移除底部布局if(count>50){listView.removeFooterView(footer);Toast.makeText(this,"没有更多数据", 500).show();return;}for(int i=count;i<count+10;i++){list.add("数据"+i);}count=count+10;/** 通知adapter数据改变*/adapter.notifyDataSetChanged();}}MyListView.java
package com.example.listview;import java.util.Date;import android.content.Context;import android.util.AttributeSet;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.view.animation.LinearInterpolator;import android.view.animation.RotateAnimation;import android.widget.AbsListView;import android.widget.AbsListView.OnScrollListener;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.ProgressBar;import android.widget.TextView;/** * ListView添加刷新头部自定义的ListView * * @author 刘梓未 * * */public class MyListView extends ListView implements OnScrollListener { private final static int RELEASE_To_REFRESH = 0;// 下拉过程的状态值 private final static int PULL_To_REFRESH = 1; // 从下拉返回到不刷新的状态值 private final static int REFRESHING = 2;// 正在刷新的状态值 private final static int DONE = 3; private final static int LOADING = 4; // 实际的padding的距离与界面上偏移距离的比例 private final static int RATIO = 3; private LayoutInflater inflater; // ListView头部下拉刷新的布局 private LinearLayout headerView; private TextView lvHeaderTipsTv; private TextView lvHeaderLastUpdatedTv; private ImageView lvHeaderArrowIv; private ProgressBar lvHeaderProgressBar; // 定义头部下拉刷新的布局的高度 private int headerContentHeight; private RotateAnimation animation; private RotateAnimation reverseAnimation; private int startY; private int state; private boolean isBack; // 用于保证startY的值在一个完整的touch事件中只被记录一次 private boolean isRecored; private OnRefreshListener refreshListener; private boolean isRefreshable; public MyListView(Context context) { super(context); init(context); } public MyListView(Context context, AttributeSet attrs) { super(context, attrs); init(context); } private void init(Context context) { setCacheColorHint(context.getResources().getColor(android.R.color.transparent)); inflater = LayoutInflater.from(context); headerView = (LinearLayout) inflater.inflate(R.layout.listview_header, null); lvHeaderTipsTv = (TextView) headerView .findViewById(R.id.lvHeaderTipsTv); lvHeaderLastUpdatedTv = (TextView) headerView .findViewById(R.id.lvHeaderLastUpdatedTv); lvHeaderArrowIv = (ImageView) headerView .findViewById(R.id.lvHeaderArrowIv); // 设置下拉刷新图标的最小高度和宽度 lvHeaderArrowIv.setMinimumWidth(70); lvHeaderArrowIv.setMinimumHeight(50); lvHeaderProgressBar = (ProgressBar) headerView .findViewById(R.id.lvHeaderProgressBar); measureView(headerView); headerContentHeight = headerView.getMeasuredHeight(); // 设置内边距，正好距离顶部为一个负的整个布局的高度，正好把头部隐藏 headerView.setPadding(0, -1 * headerContentHeight, 0, 0); // 重绘一下 headerView.invalidate(); // 将下拉刷新的布局加入ListView的顶部 addHeaderView(headerView, null, false); // 设置滚动监听事件 setOnScrollListener(this); // 设置旋转动画事件 animation = new RotateAnimation(0, -180, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f); animation.setInterpolator(new LinearInterpolator()); animation.setDuration(250); animation.setFillAfter(true); reverseAnimation = new RotateAnimation(-180, 0, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f); reverseAnimation.setInterpolator(new LinearInterpolator()); reverseAnimation.setDuration(200); reverseAnimation.setFillAfter(true); // 一开始的状态就是下拉刷新完的状态，所以为DONE state = DONE; // 是否正在刷新 isRefreshable = false; } @Override public void onScrollStateChanged(AbsListView view, int scrollState) { } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { } @Override public boolean onTouchEvent(MotionEvent ev) { if (isRefreshable) { switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: if (!isRecored) { isRecored = true; startY = (int) ev.getY();// 手指按下时记录当前位置 } break; case MotionEvent.ACTION_UP: if (state != REFRESHING && state != LOADING) { if (state == PULL_To_REFRESH) { state = DONE; changeHeaderViewByState(); } if (state == RELEASE_To_REFRESH) { state = REFRESHING; changeHeaderViewByState(); onLvRefresh(); } } isRecored = false; isBack = false; break; case MotionEvent.ACTION_MOVE: int tempY = (int) ev.getY(); if (!isRecored) { isRecored = true; startY = tempY; } if (state != REFRESHING && isRecored && state != LOADING) { // 保证在设置padding的过程中，当前的位置一直是在head，否则如果当列表超出屏幕的话，当在上推的时候，列表会同时进行滚动 // 可以松手去刷新了 if (state == RELEASE_To_REFRESH) { setSelection(0); // 往上推了，推到了屏幕足够掩盖head的程度，但是还没有推到全部掩盖的地步 if (((tempY - startY) / RATIO < headerContentHeight)// 由松开刷新状态转变到下拉刷新状态 && (tempY - startY) > 0) { state = PULL_To_REFRESH; changeHeaderViewByState(); } // 一下子推到顶了 else if (tempY - startY <= 0) {// 由松开刷新状态转变到done状态 state = DONE; changeHeaderViewByState(); } } // 还没有到达显示松开刷新的时候,DONE或者是PULL_To_REFRESH状态 if (state == PULL_To_REFRESH) { setSelection(0); // 下拉到可以进入RELEASE_TO_REFRESH的状态 if ((tempY - startY) / RATIO >= headerContentHeight) {// 由done或者下拉刷新状态转变到松开刷新 state = RELEASE_To_REFRESH; isBack = true; changeHeaderViewByState(); } // 上推到顶了 else if (tempY - startY <= 0) {// 由DOne或者下拉刷新状态转变到done状态 state = DONE; changeHeaderViewByState(); } } // done状态下 if (state == DONE) { if (tempY - startY > 0) { state = PULL_To_REFRESH; changeHeaderViewByState(); } } // 更新headView的size if (state == PULL_To_REFRESH) { headerView.setPadding(0, -1 * headerContentHeight + (tempY - startY) / RATIO, 0, 0); } // 更新headView的paddingTop if (state == RELEASE_To_REFRESH) { headerView.setPadding(0, (tempY - startY) / RATIO - headerContentHeight, 0, 0); } } break; default: break; } } return super.onTouchEvent(ev); } // 当状态改变时候，调用该方法，以更新界面 private void changeHeaderViewByState() { switch (state) { case RELEASE_To_REFRESH: lvHeaderArrowIv.setVisibility(View.VISIBLE); lvHeaderProgressBar.setVisibility(View.GONE); lvHeaderTipsTv.setVisibility(View.VISIBLE); lvHeaderLastUpdatedTv.setVisibility(View.VISIBLE); lvHeaderArrowIv.clearAnimation();// 清除动画 lvHeaderArrowIv.startAnimation(animation);// 开始动画效果 lvHeaderTipsTv.setText("松开刷新"); break; case PULL_To_REFRESH: lvHeaderProgressBar.setVisibility(View.GONE); lvHeaderTipsTv.setVisibility(View.VISIBLE); lvHeaderLastUpdatedTv.setVisibility(View.VISIBLE); lvHeaderArrowIv.clearAnimation(); lvHeaderArrowIv.setVisibility(View.VISIBLE); // 是由RELEASE_To_REFRESH状态转变来的 if (isBack) { isBack = false; lvHeaderArrowIv.clearAnimation(); lvHeaderArrowIv.startAnimation(reverseAnimation); lvHeaderTipsTv.setText("下拉刷新"); } else { lvHeaderTipsTv.setText("下拉刷新"); } break; case REFRESHING: headerView.setPadding(0, 0, 0, 0); lvHeaderProgressBar.setVisibility(View.VISIBLE); lvHeaderArrowIv.clearAnimation(); lvHeaderArrowIv.setVisibility(View.GONE); lvHeaderTipsTv.setText("正在刷新..."); lvHeaderLastUpdatedTv.setVisibility(View.VISIBLE); break; case DONE: headerView.setPadding(0, -1 * headerContentHeight, 0, 0); lvHeaderProgressBar.setVisibility(View.GONE); lvHeaderArrowIv.clearAnimation(); lvHeaderArrowIv.setImageResource(R.drawable.head_arrow); lvHeaderTipsTv.setText("下拉刷新"); lvHeaderLastUpdatedTv.setVisibility(View.VISIBLE); break; } } // 此方法直接照搬自网络上的一个下拉刷新的demo，此处是“估计”headView的width以及height private void measureView(View child) { ViewGroup.LayoutParams params = child.getLayoutParams(); if (params == null) { params = new ViewGroup.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT); } int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0, params.width); int lpHeight = params.height; int childHeightSpec; if (lpHeight > 0) { childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY); } else { childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); } child.measure(childWidthSpec, childHeightSpec); } public void setonRefreshListener(OnRefreshListener refreshListener) { this.refreshListener = refreshListener; isRefreshable = true; } public interface OnRefreshListener { public void onRefresh(); } @SuppressWarnings("deprecation")public void onRefreshComplete() { state = DONE; lvHeaderLastUpdatedTv.setText("最近更新:" + new Date().toLocaleString()); changeHeaderViewByState(); } private void onLvRefresh() { if (refreshListener != null) { refreshListener.onRefresh(); } }}listview_footer.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center" android:layout_marginTop="10dp" android:orientation="horizontal" > <ProgressBar android:id="@+id/footer_progress" android:layout_width="wrap_content" android:layout_height="wrap_content" /></LinearLayout>
listview_header.xml
<?xml version="1.0" encoding="utf-8"?><!-- ListView的头部 --><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" > <!-- 内容 --> <RelativeLayout android:id="@+id/head_contentLayout" android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="@drawable/list_header_bg" android:paddingLeft="30dp"> <!-- 箭头图像、进度条 --> <FrameLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_centerVertical="true" > <!-- 箭头 --> <ImageView android:id="@+id/lvHeaderArrowIv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:src="@drawable/head_arrow" /> <!-- 进度条 --> <ProgressBar android:id="@+id/lvHeaderProgressBar" style="?android:attr/progressBarStyleSmall" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:visibility="gone" /> </FrameLayout> <!-- 提示、最近更新 --> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:gravity="center_horizontal" android:orientation="vertical" > <!-- 提示 --> <TextView android:id="@+id/lvHeaderTipsTv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="下拉刷新" android:textSize="13sp" /> <!-- 最近更新 --> <TextView android:id="@+id/lvHeaderLastUpdatedTv" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="最新更新" android:textSize="10sp" /> </LinearLayout> </RelativeLayout></LinearLayout>
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