箭头就在前面那个空格区域(3个点的后面),晕啊,
箭头是白色的看不到,,,你在那里用鼠标拖一下就出来了,或者到我空间相册下载....
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这个博客好想不能提供下载代码啊, 我只能把代码贴出来了...
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其实你只需看用法, 不用关心具体实现,demo非常容易看懂
public class CustomListViewActivity extends Activity {
private CustomListView listview;
private ArrayList data;
private BaseAdapter adapter;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
setListener();
}
private void init(){
data = new ArrayList();
//虚拟一些数据
data.add("a");
data.add("b");
data.add("c");
data.add("e");
data.add("f");
data.add("g");
data.add("h");
data.add("i");
data.add("j");
data.add("k");
data.add("L");
data.add("M");
data.add("L");
data.add("N");
data.add("O");
data.add("P");
data.add("Q");
listview = (CustomListView) findViewById(R.id.listview);
adapter = new BaseAdapter(){
@Override
public int getCount() {
return data.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
TextView textView = new TextView(getApplicationContext());
textView.setHeight(100);
textView.setTextSize(20);
textView.setGravity(Gravity.CENTER);
textView.setBackgroundColor(0x66666666);
textView.setTextColor(0xaaffffff);
textView.setText(data.get(position));
return textView;
}
};
listview.setAdapter(adapter);
}
private void setListener(){
listview.setOnRefreshListner(new OnRefreshListner() {
@Override
public void onRefresh() {
new AsyncTask>(){
@Override
protected ArrayList 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();
}
ArrayList virtualData = new ArrayList();
virtualData.add("Head刷新后的新数据1");
virtualData.add("Head刷新后的新数据2");
virtualData.add("Head刷新后的新数据3");
virtualData.add("Head刷新后的新数据4");
virtualData.add("Head刷新后的新数据5");
virtualData.add("Head刷新后的新数据6");
return virtualData;
}
//更新UI的方法,系统自动实现
@Override
protected void onPostExecute(ArrayList 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();
}
});
//创建FootView
final View footer = View.inflate(CustomListViewActivity.this, R.layout.footer, null);
listview.setOnAddFootListener(new OnAddFootListener() {
@Override
public void addFoot() {
listview.addFooterView(footer);
}
});
listview.setOnFootLoadingListener(new OnFootLoadingListener() {
@Override
public void onFootLoading() {
new AsyncTask>(){
@Override
protected ArrayList 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();
}
ArrayList virtualData = new ArrayList();
virtualData.add("Foot刷新后的新数据1");
virtualData.add("Foot刷新后的新数据2");
virtualData.add("Foot刷新后的新数据3");
virtualData.add("Foot刷新后的新数据4");
virtualData.add("Foot刷新后的新数据5");
virtualData.add("Foot刷新后的新数据6");
return virtualData;
}
//在doInBackground后面执行
@Override
protected void onPostExecute(ArrayList 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();
}
});
}
} 下面上listview的代码,有点长...
/**
* 支持下拉刷新和上拉刷新
* 可自定义上啦和下拉过程的操作,推荐使用AsyncTask
* 需自定义Foot的View,然后只需在addFoot方法中添加即可
* @author lxj
*
*/
public class CustomListView 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 CustomListView(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.head, null);
headArrow = (ImageView) headView.findViewById(R.id.head_arrow);
progressBar = (ProgressBar) headView.findViewById(R.id.progressbar);
headTitle = (TextView) headView.findViewById(R.id.head_title);
headLastUpdate = (TextView) headView
.findViewById(R.id.head_last_update);
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
*
* @param child
*/
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
@Override
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();
Log.d("addFoot================","执行添加Foot....");
}
Log.d("count================", count+"");
Log.d("lastPos================", lastPos+"");
}
@Override
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
*
* @param listener
*/
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
* @author lxj
*
*/
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
* @author lxj
*
*/
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
* @author lxj
*
*/
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);
}
}下面是布局文件:
main.xml