版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/u012591964/article/details/50698515
网上关于这方面的内容有很多，但是有些使用比较复杂，有些存在一些BUG，在这里整合网上资源。
主要解决了RELEASE--》PULL header状态不正确，footer不正确显示等问题。
header的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="match_parent"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:gravity="center"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="10dp" >
<LinearLayout
android:id="@+id/layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:orientation="vertical" >
<ProgressBar
android:id="@+id/refreshing"
style="@style/customProgressBar" />
<TextView
android:id="@+id/tip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center" />
<TextView
android:id="@+id/lastUpdate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:textSize="12sp" />
</LinearLayout>
<ImageView
android:id="@+id/arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginRight="20dp"
android:layout_toLeftOf="@id/layout"
android:contentDescription="@string/d"
android:src="@drawable/pull_to_refresh_arrow" />
</RelativeLayout>
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/h_line"
android:contentDescription="@string/d" />
</LinearLayout>footer的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:gravity="center"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:orientation="horizontal"
android:visibility="invisible" >
<TextView
android:id="@+id/loadFull"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:padding="5dp"
android:text="@string/load_full"
android:visibility="gone" />
<TextView
android:id="@+id/noData"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:padding="5dp"
android:text="@string/no_data"
android:visibility="gone" />
<TextView
android:id="@+id/more"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:padding="5dp"
android:text="@string/more" />
<ProgressBar
android:id="@+id/loading"
style="@style/customProgressBar" />
</LinearLayout>
源代码文件：
public class AutoListView extends ListView implements OnScrollListener {
// 区分当前操作是刷新还是加载
public static final int REFRESH = 0;
public static final int LOAD = 1;
// 区分PULL和RELEASE的距离的大小
private static final int SPACE = 20;
// 定义header的四种状态和当前状态
private static final int NONE = 0;
private static final int PULL = 1;
private static final int RELEASE = 2;
private static final int REFRESHING = 3;
private int state;
private LayoutInflater inflater;
private View header;
private View footer;
private TextView tip;
private TextView lastUpdate;
private ImageView arrow;
private ProgressBar refreshing;
private TextView noData;
private TextView loadFull;
private TextView more;
private ProgressBar loading;
private RotateAnimation animation;
private RotateAnimation reverseAnimation;
private int startY;
private int firstVisibleItem;
private int scrollState;
private int headerContentInitialHeight;
private int headerContentHeight;
// 只有在listview第一个item显示的时候（listview滑到了顶部）才进行下拉刷新， 否则此时的下拉只是滑动listview
private boolean isRecorded;
private boolean isLoading;
private boolean loadEnable = true;// 开启或者关闭加载更多功能
private boolean isLoadFull;
private int pageSize = 10;
private OnRefreshListener onRefreshListener;
private OnLoadListener onLoadListener;
public AutoListView(Context context) {
super(context);
initView(context);
}
public AutoListView(Context context, AttributeSet attrs) {
super(context, attrs);
initView(context);
}
public AutoListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initView(context);
}
// 下拉刷新监听
public void setOnRefreshListener(OnRefreshListener onRefreshListener) {
this.onRefreshListener = onRefreshListener;
}
// 加载更多监听
public void setOnLoadListener(OnLoadListener onLoadListener) {
this.loadEnable = true;
this.onLoadListener = onLoadListener;
}
public boolean isLoadEnable() {
return loadEnable;
}
// 这里的开启或者关闭加载更多，并不支持动态调整
public void setLoadEnable(boolean loadEnable) {
this.loadEnable = loadEnable;
if (!loadEnable)
this.removeFooterView(footer);
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
private void initView(Context context) {
// 设置箭头特效
animation = new RotateAnimation(0, -180, RotateAnimation.RELATIVE_TO_SELF, 0.5f,
RotateAnimation.RELATIVE_TO_SELF, 0.5f);
animation.setInterpolator(new LinearInterpolator());
animation.setDuration(100);
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(100);
reverseAnimation.setFillAfter(true);
inflater = LayoutInflater.from(context);
footer = inflater.inflate(R.layout.listview_footer, null);
loadFull = (TextView) footer.findViewById(R.id.loadFull);
noData = (TextView) footer.findViewById(R.id.noData);
more = (TextView) footer.findViewById(R.id.more);
loading = (ProgressBar) footer.findViewById(R.id.loading);
header = inflater.inflate(R.layout.pull_to_refresh_header, null);
arrow = (ImageView) header.findViewById(R.id.arrow);
tip = (TextView) header.findViewById(R.id.tip);
lastUpdate = (TextView) header.findViewById(R.id.lastUpdate);
refreshing = (ProgressBar) header.findViewById(R.id.refreshing);
// 为listview添加头部和尾部，并进行初始化
headerContentInitialHeight = header.getPaddingTop();
measureView(header);
header.setTag("HEADER");
footer.setTag("FOOTER");
headerContentHeight = header.getMeasuredHeight();
topPadding(-headerContentHeight);
this.addHeaderView(header);
this.addFooterView(footer);
this.setOnScrollListener(this);
}
public void onRefresh() {
if (onRefreshListener != null) {
onRefreshListener.onRefresh();
}
}
public void onLoad() {
if (onLoadListener != null) {
onLoadListener.onLoad();
}
}
// 设置更新时间
public void onRefreshComplete(String updateTime) {
lastUpdate.setText(this.getContext().getString(R.string.lastUpdateTime, TimeUtils.getCurrentTime()));
state = NONE;
refreshHeaderViewByState();
}
public void onRefreshComplete() {
String currentTime = TimeUtils.getCurrentTime();
onRefreshComplete(currentTime);
}
public void onLoadComplete() {
isLoading = false;
if (loadEnable)
footer.setVisibility(INVISIBLE);// 加载完成隐藏footer
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
this.firstVisibleItem = firstVisibleItem;
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
this.scrollState = scrollState;
ifNeedLoad(view, scrollState);
}
private void ifNeedLoad(AbsListView view, int scrollState) {
// 没有开启加载功能直接返回
if (!loadEnable) {
return;
}
try {// 这里判断可视项最后一项为footer,则加载。这里有一个BUG，假如项数较少，没有铺满屏幕，
// 下拉也能触发加载。
if (scrollState == OnScrollListener.SCROLL_STATE_IDLE && !isLoading
&& view.getLastVisiblePosition() == view.getPositionForView(footer) && !isLoadFull) {
footer.setVisibility(VISIBLE);// 加载数据显示footer
onLoad();
isLoading = true;
}
} catch (Exception e) {
}
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
// 根据手势滑动，触发次序为down,move,up
case MotionEvent.ACTION_DOWN:
if (firstVisibleItem == 0) {
isRecorded = true;
startY = (int) ev.getY();
}
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
if (state == PULL) {
state = NONE;
refreshHeaderViewByState();
} else if (state == RELEASE) {
state = REFRESHING;
refreshHeaderViewByState();
onRefresh();
}
isRecorded = false;
break;
case MotionEvent.ACTION_MOVE:
whenMove(ev);
break;
}
return super.onTouchEvent(ev);
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
final int actionMasked = ev.getActionMasked() & MotionEvent.ACTION_MASK;
if (actionMasked == MotionEvent.ACTION_MOVE && isRecorded && state == RELEASE) {
// 最关键的地方，忽略MOVE事件,
// ListView onTouch获取不到MOVE事件所以不会发生滚动处理
// 否则下拉刷新操作的时候， RELEASE ==》PULL 状态将会不正确
whenMove(ev);
return true;
}
return super.dispatchTouchEvent(ev);
}
private void whenMove(MotionEvent ev) {
if (!isRecorded) {
return;
}
int tmpY = (int) ev.getY();
int space = tmpY - startY; // 记录触摸滑动距离
int topPadding = space - headerContentHeight; // 触摸滑动距离减去头部高度
// 实际上是利用设置header的内边距为触摸滑动距离来实现下拉。
switch (state) {
case NONE:
if (space > 0) {
state = PULL;
refreshHeaderViewByState();
}
break;
case PULL:
topPadding(topPadding);
if (scrollState == SCROLL_STATE_TOUCH_SCROLL && space > headerContentHeight + SPACE) {
state = RELEASE;
refreshHeaderViewByState();
}
break;
case RELEASE:
topPadding(topPadding);
if (space > 0 && space < headerContentHeight + SPACE) {
state = PULL;
refreshHeaderViewByState();
} else if (space <= 0) {
state = NONE;
refreshHeaderViewByState();
}
break;
}
}
// 修正header位置
private void topPadding(int topPadding) {
header.setPadding(header.getPaddingLeft(), topPadding, header.getPaddingRight(), header.getPaddingBottom());
header.invalidate();
}
// 根据数据数量修改footer的提示
public void setResultSize(int resultSize) {
if (resultSize == 0) {
isLoadFull = true;
loadFull.setVisibility(View.GONE);
loading.setVisibility(View.GONE);
more.setVisibility(View.GONE);
noData.setVisibility(View.VISIBLE);
} else if (resultSize > 0 && resultSize < pageSize) {
isLoadFull = true;
loadFull.setVisibility(View.VISIBLE);
loading.setVisibility(View.GONE);
more.setVisibility(View.GONE);
noData.setVisibility(View.GONE);
} else if (resultSize == pageSize) {
isLoadFull = false;
loadFull.setVisibility(View.GONE);
loading.setVisibility(View.VISIBLE);
more.setVisibility(View.VISIBLE);
noData.setVisibility(View.GONE);
}
}
// 根据header的状态修改提示
private void refreshHeaderViewByState() {
switch (state) {
case NONE:
topPadding(-headerContentHeight);
tip.setText(R.string.pull_to_refresh);
refreshing.setVisibility(View.GONE);
arrow.clearAnimation();
arrow.setImageResource(R.drawable.pull_to_refresh_arrow);
break;
case PULL:
arrow.setVisibility(View.VISIBLE);
tip.setVisibility(View.VISIBLE);
lastUpdate.setVisibility(View.VISIBLE);
refreshing.setVisibility(View.GONE);
tip.setText(R.string.pull_to_refresh);
arrow.clearAnimation();
arrow.setAnimation(reverseAnimation);
break;
case RELEASE:
arrow.setVisibility(View.VISIBLE);
tip.setVisibility(View.VISIBLE);
lastUpdate.setVisibility(View.VISIBLE);
refreshing.setVisibility(View.GONE);
tip.setText(R.string.pull_to_refresh);
tip.setText(R.string.release_to_refresh);
arrow.clearAnimation();
arrow.setAnimation(animation);
break;
case REFRESHING:
topPadding(headerContentInitialHeight);
refreshing.setVisibility(View.VISIBLE);
arrow.clearAnimation();
arrow.setVisibility(View.GONE);
tip.setVisibility(View.GONE);
lastUpdate.setVisibility(View.GONE);
break;
}
}
// 计算header的高度，否则直接调用getMesureHeight会返回0
private void measureView(View child) {
ViewGroup.LayoutParams p = child.getLayoutParams();
if (p == null) {
p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_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 interface OnRefreshListener {
public void onRefresh();
}
public interface OnLoadListener {
public void onLoad();
}
}
使用这个listview的时候，只需要自己实现OnRefreshListener和OnLoadListener接口，就可以回调你所需的操作。
这里还有一个bug暂时没有修复，见代码181行。