Android中ListView下拉刷新的实现


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ListView中的下拉刷新是非常常见的，也是经常使用的，看到有很多同学想要，那我就整理一下，供大家参考。那我就不解释，直接上代码了。

这里需要自己重写一下ListView,重写代码如下:

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package net.loonggg.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;  
  
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(R.color.transparent));  
        inflater = LayoutInflater.from(context);  
        headerView = (LinearLayout) inflater.inflate(R.layout.lv_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) {  
                if (firstVisibleItem == 0) {  
                    isRefreshable = true;  
                 } else {  
                    isRefreshable = false;  
                 }     
        }  
  
    @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.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.FILL_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();  
    }  
  
    public void onRefreshComplete() {  
        state = DONE;  
        lvHeaderLastUpdatedTv.setText("最近更新:" + new Date().toLocaleString());  
        changeHeaderViewByState();  
    }  
  
    private void onLvRefresh() {  
        if (refreshListener != null) {  
            refreshListener.onRefresh();  
        }  
    }  
  
    public void setAdapter(LvAdapter adapter) {  
        lvHeaderLastUpdatedTv.setText("最近更新:" + new Date().toLocaleString());  
        super.setAdapter(adapter);  
    }  
  
}  

package net.loonggg.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;

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(R.color.transparent));
inflater = LayoutInflater.from(context);
headerView = (LinearLayout) inflater.inflate(R.layout.lv_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) {
if (firstVisibleItem == 0) {
                    isRefreshable = true;
                 } else {
                    isRefreshable = false;
                 }
        }

@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.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.FILL_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();
}

public void onRefreshComplete() {
state = DONE;
lvHeaderLastUpdatedTv.setText("最近更新:" + new Date().toLocaleString());
changeHeaderViewByState();
}

private void onLvRefresh() {
if (refreshListener != null) {
refreshListener.onRefresh();
}
}

public void setAdapter(LvAdapter adapter) {
lvHeaderLastUpdatedTv.setText("最近更新:" + new Date().toLocaleString());
super.setAdapter(adapter);
}

}

重写完ListView之后，在布局文件中是这么使用的，头部下拉刷新的布局文件lv_header.xml代码如下：

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<?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"  
    android:background="#000000" >  
  
    <!-- 内容 -->  
  
    <RelativeLayout  
        android:id="@+id/head_contentLayout"  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content"  
        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/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:textColor="@color/white"  
                android:textSize="20sp" />  
  
            <!-- 最近更新 -->  
  
            <TextView  
                android:id="@+id/lvHeaderLastUpdatedTv"  
                android:layout_width="wrap_content"  
                android:layout_height="wrap_content"  
                android:text="上次更新"  
                android:textColor="@color/gold"  
                android:textSize="10sp" />  
        </LinearLayout>  
    </RelativeLayout>  
  
</LinearLayout>  

<?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"
android:background="#000000" >

<!-- 内容 -->

<RelativeLayout
android:id="@+id/head_contentLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
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/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:textColor="@color/white"
android:textSize="20sp" />

<!-- 最近更新 -->

<TextView
android:id="@+id/lvHeaderLastUpdatedTv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="上次更新"
android:textColor="@color/gold"
android:textSize="10sp" />
</LinearLayout>
</RelativeLayout>

</LinearLayout>

在Main.xml中进行设置，代码如下：

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<?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="fill_parent"  
    android:background="#000000"  
    android:orientation="vertical" >  
  
    <net.loonggg.listview.MyListView  
        android:id="@+id/lv"  
        android:layout_width="fill_parent"  
        android:layout_height="fill_parent" />  
  
</LinearLayout>  

<?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="fill_parent"
android:background="#000000"
android:orientation="vertical" >

<net.loonggg.listview.MyListView
android:id="@+id/lv"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />

</LinearLayout>

然后就是在MainActivity中实现，代码如下：

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package net.loonggg.listview;  
  
import java.util.ArrayList;  
import java.util.List;  
  
import net.loonggg.listview.MyListView.OnRefreshListener;  
import android.app.Activity;  
import android.os.AsyncTask;  
import android.os.Bundle;  
import android.view.View;  
  
public class MainActivity extends Activity {  
    private List<String> list;  
    private MyListView lv;  
    private LvAdapter adapter;  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
        lv = (MyListView) findViewById(R.id.lv);  
        list = new ArrayList<String>();  
        list.add("loonggg");  
        list.add("我们都是开发者");  
        list.add("我们都是开发者");  
        list.add("我们都是开发者");  
        list.add("我们都是开发者");  
        list.add("我们都是开发者");  
        list.add("我们都是开发者");  
        list.add("我们都是开发者");  
        list.add("我们都是开发者");  
        list.add("我们都是开发者");  
        list.add("我们都是开发者");  
        list.add("我们都是开发者");  
        list.add("我们都是开发者");  
        list.add("我们都是开发者");  
        list.add("我们都是开发者");  
        list.add("我们都是开发者");  
        list.add("我们都是开发者");  
        adapter = new LvAdapter(list, this);  
        lv.setAdapter(adapter);  
  
        lv.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();  
                        lv.onRefreshComplete();  
                    }  
                }.execute(null, null, null);  
            }  
        });  
    }  
}  

package net.loonggg.listview;

import java.util.ArrayList;
import java.util.List;

import net.loonggg.listview.MyListView.OnRefreshListener;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends Activity {
private List<String> list;
private MyListView lv;
private LvAdapter adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv = (MyListView) findViewById(R.id.lv);
list = new ArrayList<String>();
list.add("loonggg");
list.add("我们都是开发者");
list.add("我们都是开发者");
list.add("我们都是开发者");
list.add("我们都是开发者");
list.add("我们都是开发者");
list.add("我们都是开发者");
list.add("我们都是开发者");
list.add("我们都是开发者");
list.add("我们都是开发者");
list.add("我们都是开发者");
list.add("我们都是开发者");
list.add("我们都是开发者");
list.add("我们都是开发者");
list.add("我们都是开发者");
list.add("我们都是开发者");
list.add("我们都是开发者");
adapter = new LvAdapter(list, this);
lv.setAdapter(adapter);

lv.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();
lv.onRefreshComplete();
}
}.execute(null, null, null);
}
});
}
}

这里还需要为ListView设置一下Adapter,自定义的Adapter如下：

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package net.loonggg.listview;  
  
import java.util.List;  
  
import android.content.Context;  
import android.view.View;  
import android.view.ViewGroup;  
import android.widget.BaseAdapter;  
import android.widget.TextView;  
  
public class LvAdapter extends BaseAdapter {  
    private List<String> list;  
    private Context context;  
  
    public LvAdapter(List<String> list, Context context) {  
        this.list = list;  
        this.context = context;  
    }  
  
    @Override  
    public int getCount() {  
        return list.size();  
    }  
  
    @Override  
    public Object getItem(int position) {  
        return list.get(position);  
    }  
  
    @Override  
    public long getItemId(int position) {  
        return position;  
    }  
  
    @Override  
    public View getView(int position, View convertView, ViewGroup parent) {  
        TextView tv = new TextView(context.getApplicationContext());  
        tv.setText(list.get(position));  
        return tv;  
    }  
  
}