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自定义ListView：
layout:
public class MyListView extends ListView implements OnScrollListener {
public final int RATIO = 5;// 手拖动时，手指拖动距离与header下移的倍数
private final int LOADING = 0;// 正在加载
private final int RELEASE_To_REFRESH = 2;// 正在下拉状态，即将松手进行刷新
private final int DONE = 3;// 完成
private final int HIDE_To_REFRESH = 1;// 未下拉或已完成状态，设置padding为负值把header挡住
private int refreshStatus;// 下拉刷新过程状态变量
private LinearLayout hearderLayout;
private ImageView arrowImageView;
private ProgressBar progressBar;
private TextView tipsTextview;
private TextView lastUpdatedTime;
private int headContentHeight;
private int headContentWidth;
private RotateAnimation animation;
private RotateAnimation reverseAnimation;
private boolean isStartRefreshEvent = false;// 下拉刷新事件是否已经开始
private boolean isRefreshable = false;// 是否设置下拉刷新监听
private int firstItemIndex;
private OnRefreshListener refreshListener;
public MyListView (Context context) {
super(context);
init(context);
}
public MyListView (Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
private void init(Context context) {
LayoutInflater inflater = LayoutInflater.from(context);
hearderLayout = (LinearLayout) inflater.inflate(R.layout.list_view_header, null);
// 下拉箭头
arrowImageView = (ImageView) hearderLayout.findViewById(R.id.head_arrowImageView);
// 进度条
progressBar = (ProgressBar) hearderLayout.findViewById(R.id.head_progressBar);
// 下拉提示 刷新
tipsTextview = (TextView) hearderLayout.findViewById(R.id.head_tipsTextView);
// 最新一次刷新时间
lastUpdatedTime = (TextView) hearderLayout.findViewById(R.id.head_lastUpdatedTextView);
// 计算head的高宽
this.measureView(hearderLayout);
headContentHeight = hearderLayout.getMeasuredHeight();
headContentWidth = hearderLayout.getMeasuredWidth();
// 初始状态是 隐藏掉head 布局
hearderLayout.setPadding(0, -1 * headContentHeight, 0, 0);
hearderLayout.invalidate();
Log.e("sys", "width:" + headContentWidth + " height:" + headContentHeight);
// list添加头文件
addHeaderView(hearderLayout, null, false);
setOnScrollListener(this);// TODO
// 下拉以及恢复动画
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);
refreshStatus = DONE;
}
@Override
public void onScroll(AbsListView arg0, int firstVisiableItem, int arg2, int arg3) {
firstItemIndex = firstVisiableItem;
}
@Override
public void onScrollStateChanged(AbsListView arg0, int arg1) {
}
private int startY = 0;
@Override
public boolean onTouchEvent(MotionEvent event) {
if (firstItemIndex == 0 && isRefreshable) {
switch (event.getAction()) {
// 在down时候记录当前Y的位置
case MotionEvent.ACTION_DOWN:
if (!isStartRefreshEvent) {
isStartRefreshEvent = true;
startY = (int) event.getY();
}
break;
case MotionEvent.ACTION_MOVE:
int tempY = (int) event.getY();
int scrollY = (tempY - startY) / RATIO;
Log.i("sys", "拉开方向 " + scrollY);
if (!isStartRefreshEvent) {
isStartRefreshEvent = true;
startY = tempY;
} else if (isStartRefreshEvent && refreshStatus != LOADING) {
// 可以松手去刷新了
if (refreshStatus == RELEASE_To_REFRESH) {
setSelection(0);
// header被用户拉下来后，又往上推了，推到了已经小于header高度时，则推回去，并取消刷新
if (scrollY < headContentHeight && scrollY > 0) {
refreshStatus = HIDE_To_REFRESH;
this.changeHeaderView();
}
// 一下子推到顶了
else if (scrollY <= 0) {
refreshStatus = DONE;
this.changeHeaderView();
}
}
// 还没有到达显示松开刷新的时候,DONE或者是HIDE_To_REFRESH状态
if (refreshStatus == HIDE_To_REFRESH) {
setSelection(0);
// 下拉至超过header本身高度后，可以进入RELEASE_TO_REFRESH的状态
if (scrollY > headContentHeight) {
refreshStatus = RELEASE_To_REFRESH;
this.changeHeaderView();
}
// 上推到顶了
else if (scrollY <= 0) {
refreshStatus = DONE;
this.changeHeaderView();
}
}
// done状态下
if (refreshStatus == DONE) {
if (scrollY > 0) {
refreshStatus = HIDE_To_REFRESH;
this.changeHeaderView();
}
}
// 更新headView的size
if (refreshStatus == HIDE_To_REFRESH) {
hearderLayout.setPadding(0, -1 * headContentHeight + scrollY, 0, 0);
}
// 更新headView的paddingTop
if (refreshStatus == RELEASE_To_REFRESH) {
hearderLayout.setPadding(0, scrollY - headContentHeight, 0, 0);
}
}
break;
case MotionEvent.ACTION_UP:
if (refreshStatus != LOADING) {
if (refreshStatus == DONE) {
// 什么都不做
}
// 由下拉刷新状态，到done状态
if (refreshStatus == HIDE_To_REFRESH) {
refreshStatus = DONE;
this.changeHeaderView();
}
if (refreshStatus == RELEASE_To_REFRESH) {
refreshStatus = LOADING;
this.changeHeaderView();
onRefresh();
}
}
isStartRefreshEvent = false;
break;
}
}
return super.onTouchEvent(event);
}
private void changeHeaderView() {
switch (refreshStatus) {
// 松开刷新状态
case RELEASE_To_REFRESH:
arrowImageView.setVisibility(View.VISIBLE);
progressBar.setVisibility(View.GONE);
tipsTextview.setVisibility(View.VISIBLE);
lastUpdatedTime.setVisibility(View.VISIBLE);
arrowImageView.clearAnimation();
arrowImageView.startAnimation(animation);
tipsTextview.setText("松开刷新");
break;
// 下拉刷新
case HIDE_To_REFRESH:
progressBar.setVisibility(View.GONE);
tipsTextview.setVisibility(View.VISIBLE);
lastUpdatedTime.setVisibility(View.VISIBLE);
arrowImageView.setVisibility(View.VISIBLE);
// 是由RELEASE_To_REFRESH状态转变来的
arrowImageView.clearAnimation();
arrowImageView.startAnimation(reverseAnimation);
tipsTextview.setText("下拉刷新");
break;
// 刷新中 状态
case LOADING:
hearderLayout.setPadding(0, 0, 0, 0);
progressBar.setVisibility(View.VISIBLE);
arrowImageView.clearAnimation();
arrowImageView.setVisibility(View.GONE);
tipsTextview.setText("正在刷新...");
lastUpdatedTime.setVisibility(View.VISIBLE);
break;
// 刷新完毕
case DONE:
hearderLayout.setPadding(0, -1 * headContentHeight, 0, 0);
progressBar.setVisibility(View.GONE);
arrowImageView.clearAnimation();
// arrowImageView.setImageResource(R.drawable.goicon);
tipsTextview.setText("下拉刷新");
lastUpdatedTime.setVisibility(View.VISIBLE);
break;
}
}
public void setonRefreshListener(OnRefreshListener refreshListener) {
this.refreshListener = refreshListener;
isRefreshable = true;
}
public interface OnRefreshListener {
public void onRefresh();
}
public void onRefreshFinished() {
refreshStatus = DONE;
DateFormat format = new SimpleDateFormat("yyyy年MM月dd日 HH:mm");
String date = format.format(new Date());
lastUpdatedTime.setText("最近更新:" + date);
changeHeaderView();
}
private void onRefresh() {
if (refreshListener != null) {
refreshListener.onRefresh();
}
}
// 此方法计算高度
private void measureView(View child) {
ViewGroup.LayoutParams p = child.getLayoutParams();
if (p == null) {
p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
}
int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0, p.width);
int lpHeight = p.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 setAdapter(BaseAdapter adapter) {
DateFormat format = new SimpleDateFormat("yyyy年MM月dd日 HH:mm");
String date = format.format(new Date());
lastUpdatedTime.setText("最近更新:" + date);
super.setAdapter(adapter);
}
}
layout:
<?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:background="#ffffff" >
<!-- 内容 -->
<RelativeLayout
android:id="@+id/head_contentLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingLeft="30dip" >
<!-- 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/head_arrowImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/arrow"
android:layout_gravity="center" />
<!-- 进度条,style集合了一个anim -->
<ProgressBar
android:id="@+id/head_progressBar"
style="@style/wait_anim"
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/head_tipsTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="下拉刷新"
android:textSize="15dp" />
<!-- 最近更新 -->
<TextView
android:id="@+id/head_lastUpdatedTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="上次更新"
android:textSize="12dp" />
</LinearLayout>
</RelativeLayout>
</LinearLayout>
Activity中关键代码：
mListView.setonRefreshListener(new OnRefreshListener() {
public void onRefresh() {
new AsyncTask<Void, Void, Void>() {
protected Void doInBackground(Void... params) {
try {
Thread.sleep(3000);
} catch (Exception e) {
e.printStackTrace();
}
// dates.addFirst(new AttachmentModule(new Date(), WorkLogContentType.WORKLOG_ATTACHMENT, AttachmentType.Attachment_Nomal));
return null;
}
@Override
protected void onPostExecute(Void result) {
adapter.notifyDataSetChanged();
mListView.onRefreshFinished();
}
}.execute(null);
}
});