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下拉刷新与上拉加载更多
代码如下：
/**
* ListView下拉刷新和加载更多
* <p>
*
* <strong>变更说明:</strong>
* <p>
* 默认如果设置了OnRefreshListener接口和OnLoadMoreListener接口
* <p>
* 剩余三个Flag： <br>
* mIsAutoLoadMore(是否自动加载更多) <br>
* mIsMoveToFirstItemAfterRefresh(下拉刷新后是否显示第一条Item) <br>
* mIsDoRefreshOnWindowFocused(当该ListView所在的控件显示到屏幕上时，是否直接显示正在刷新...)
*
* @author lee
*/
public class MongoPullToRefreshOrLoadMoreListView extends ListView implements
OnScrollListener {
/** 显示格式化日期模板 */
private final static String DATE_FORMAT_STR = "yyyy年MM月dd日 HH:mm";
/** 实际的padding的距离与界面上偏移距离的比例 */
private final static int RATIO = 3;
// ===========================以下4个常量为
// 下拉刷新的状态标识===============================
/** 松开刷新 */
private final static int RELEASE_TO_REFRESH = 0;
/** 下拉刷新 */
private final static int PULL_TO_REFRESH = 1;
/** 正在刷新 */
private final static int REFRESHING = 2;
/** 刷新完成 or 什么都没做，恢复原状态。 */
private final static int DONE = 3;
// ===========================以下3个常量为
// 加载更多的状态标识===============================
/** 加载中 */
private final static int ENDINT_LOADING = 1;
/** 手动完成刷新 */
private final static int ENDINT_MANUAL_LOAD_DONE = 2;
/** 自动完成刷新 */
private final static int ENDINT_AUTO_LOAD_DONE = 3;
/**
* <strong>下拉刷新HeadView的实时状态flag</strong>
*
* <p>
* 0 : RELEASE_TO_REFRESH;
* <p>
* 1 : PULL_To_REFRESH;
* <p>
* 2 : REFRESHING;
* <p>
* 3 : DONE;
*
*/
private int mHeadState;
/**
* <strong>加载更多FootView（EndView）的实时状态flag</strong>
*
* <p>
* 0 : 完成/等待刷新 ;
* <p>
* 1 : 加载中
*/
private int mEndState;
// ================================= 功能设置Flag
// ================================
/** 可以加载更多否 */
private boolean mCanLoadMore = false;
/** 可以下拉刷新否 */
private boolean mCanRefresh = false;
/** 可以自动加载更多吗？（注意，先判断是否有加载更多，如果没有，这个flag也没有意义） */
private boolean mIsAutoLoadMore = false;
/** 下拉刷新后是否显示第一条Item */
private boolean mIsMoveToFirstItemAfterRefresh = false;
/** 当该ListView所在的控件显示到屏幕上时，是否直接显示正在刷新... */
private boolean mIsDoRefreshOnUIChanged = false;
public boolean isCanLoadMore() {
return mCanLoadMore;
}
public void setCanLoadMore(boolean pCanLoadMore) {
mCanLoadMore = pCanLoadMore;
if (mCanLoadMore && getFooterViewsCount() == 0) {
addFooterView();
} else {
if (null != mEndRootView) {
removeFooterView(mEndRootView);
}
}
}
public boolean isCanRefresh() {
return mCanRefresh;
}
public void setCanRefresh(boolean pCanRefresh) {
mCanRefresh = pCanRefresh;
}
public boolean isAutoLoadMore() {
return mIsAutoLoadMore;
}
public void setAutoLoadMore(boolean pIsAutoLoadMore) {
mIsAutoLoadMore = pIsAutoLoadMore;
}
public boolean isMoveToFirstItemAfterRefresh() {
return mIsMoveToFirstItemAfterRefresh;
}
public void setMoveToFirstItemAfterRefresh(
boolean pIsMoveToFirstItemAfterRefresh) {
mIsMoveToFirstItemAfterRefresh = pIsMoveToFirstItemAfterRefresh;
}
public boolean isDoRefreshOnUIChanged() {
return mIsDoRefreshOnUIChanged;
}
public void setDoRefreshOnUIChanged(boolean pIsDoRefreshOnWindowFocused) {
mIsDoRefreshOnUIChanged = pIsDoRefreshOnWindowFocused;
}
// ============================================================================
private LayoutInflater mInflater;
private LinearLayout mHeadRootView;
private TextView mTipsTextView;
private TextView mLastUpdatedTextView;
private ImageView mArrowImageView;
private ProgressBar mProgressBar;
private View mEndRootView;
private ProgressBar mEndLoadProgressBar;
private TextView mEndLoadTipsTextView;
/** headView动画 */
private RotateAnimation mArrowAnim;
/** headView反转动画 */
private RotateAnimation mArrowReverseAnim;
/** 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 mIsRecored;
private int mHeadViewWidth;
private int mHeadViewHeight;
private int mStartY;
private boolean mIsBack;
private int mFirstItemIndex;
private int mLastItemIndex;
private int mCount;
@SuppressWarnings("unused")
private boolean mEnoughCount;// 足够数量充满屏幕？
private OnRefreshListener mRefreshListener;
private onl oadMoreListener mLoadMoreListener;
private String mLabel;
public String getLabel() {
return mLabel;
}
public void setLabel(String pLabel) {
mLabel = pLabel;
}
public MongoPullToRefreshOrLoadMoreListView(Context pContext) {
super(pContext);
init(pContext);
}
public MongoPullToRefreshOrLoadMoreListView(Context pContext,
AttributeSet pAttrs) {
super(pContext, pAttrs);
init(pContext);
}
public MongoPullToRefreshOrLoadMoreListView(Context pContext,
AttributeSet pAttrs, int pDefStyle) {
super(pContext, pAttrs, pDefStyle);
init(pContext);
}
/**
* 初始化操作
*
* @param pContext
*/
private void init(Context pContext) {
// final ViewConfiguration _ViewConfiguration =
// ViewConfiguration.get(pContext);
// mTouchSlop = _ViewConfiguration.getScaledTouchSlop();
setCacheColorHint(pContext.getResources().getColor(R.color.transparent));
setOnLongClickListener(null);
mInflater = LayoutInflater.from(pContext);
addHeadView();
setOnScrollListener(this);
initPullImageAnimation(0);
}
/**
* 添加下拉刷新的HeadView
*/
private void addHeadView() {
mHeadRootView = (LinearLayout) mInflater.inflate(
R.layout.pull_to_refresh_head2, null);
mArrowImageView = (ImageView) mHeadRootView
.findViewById(R.id.head_arrowImageView);
mArrowImageView.setMinimumWidth(70);
mArrowImageView.setMinimumHeight(50);
mProgressBar = (ProgressBar) mHeadRootView
.findViewById(R.id.head_progressBar);
mTipsTextView = (TextView) mHeadRootView
.findViewById(R.id.head_tipsTextView);
mLastUpdatedTextView = (TextView) mHeadRootView
.findViewById(R.id.head_lastUpdatedTextView);
measureView(mHeadRootView);
mHeadViewHeight = mHeadRootView.getMeasuredHeight();
mHeadViewWidth = mHeadRootView.getMeasuredWidth();
mHeadRootView.setPadding(0, -1 * mHeadViewHeight, 0, 0);
mHeadRootView.invalidate();
addHeaderView(mHeadRootView, null, false);
mHeadState = DONE;
changeHeadViewByState();
}
/**
* 添加加载更多FootView
*/
private void addFooterView() {
mEndRootView = mInflater.inflate(R.layout.pull_to_refresh_load_more,
null);
mEndRootView.setVisibility(View.VISIBLE);
mEndLoadProgressBar = (ProgressBar) mEndRootView
.findViewById(R.id.pull_to_refresh_progress);
mEndLoadTipsTextView = (TextView) mEndRootView
.findViewById(R.id.load_more);
mEndRootView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mCanLoadMore) {
if (mCanRefresh) {
if (mEndState != ENDINT_LOADING
&& mHeadState != REFRESHING) {
mEndState = ENDINT_LOADING;
onLoadMore();
}
} else if (mEndState != ENDINT_LOADING) {
mEndState = ENDINT_LOADING;
onLoadMore();
}
}
}
});
addFooterView(mEndRootView);
if (mIsAutoLoadMore) {
mEndState = ENDINT_AUTO_LOAD_DONE;
} else {
mEndState = ENDINT_MANUAL_LOAD_DONE;
}
}
/**
* 实例化下拉刷新的箭头的动画效果
*/
private void initPullImageAnimation(final int pAnimDuration) {
int _Duration;
if (pAnimDuration > 0) {
_Duration = pAnimDuration;
} else {
_Duration = 250;
}
Interpolator _Interpolator = new LinearInterpolator();
mArrowAnim = new RotateAnimation(0, -180,
RotateAnimation.RELATIVE_TO_SELF, 0.5f,
RotateAnimation.RELATIVE_TO_SELF, 0.5f);
mArrowAnim.setInterpolator(_Interpolator);
mArrowAnim.setDuration(_Duration);
mArrowAnim.setFillAfter(true);
mArrowReverseAnim = new RotateAnimation(-180, 0,
RotateAnimation.RELATIVE_TO_SELF, 0.5f,
RotateAnimation.RELATIVE_TO_SELF, 0.5f);
mArrowReverseAnim.setInterpolator(_Interpolator);
mArrowReverseAnim.setDuration(_Duration);
mArrowReverseAnim.setFillAfter(true);
}
/**
* 测量HeadView宽高(此方法仅适用于LinearLayout)
*
* @param pChild
*/
private void measureView(View pChild) {
ViewGroup.LayoutParams p = pChild.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);
}
pChild.measure(childWidthSpec, childHeightSpec);
}
/**
* 为了判断滑动到ListView底部没
*/
@Override
public void onScroll(AbsListView pView, int pFirstVisibleItem,
int pVisibleItemCount, int pTotalItemCount) {
mFirstItemIndex = pFirstVisibleItem;
mLastItemIndex = pFirstVisibleItem + pVisibleItemCount - 2;
mCount = pTotalItemCount - 2;
if (pTotalItemCount > pVisibleItemCount) {
mEnoughCount = true;
} else {
mEnoughCount = false;
}
}
/**
* 加载判断。
*/
@Override
public void onScrollStateChanged(AbsListView pView, int pScrollState) {
if (mCanLoadMore) {
if (mLastItemIndex == mCount && pScrollState == SCROLL_STATE_IDLE) {
if (mEndState != ENDINT_LOADING) {
if (mIsAutoLoadMore) {
if (mCanRefresh) {
if (mHeadState != REFRESHING) {
mEndState = ENDINT_LOADING;
onLoadMore();
changeEndViewByState();
}
} else {
mEndState = ENDINT_LOADING;
onLoadMore();
changeEndViewByState();
}
} else {
mEndState = ENDINT_MANUAL_LOAD_DONE;
changeEndViewByState();
}
}
}
} else if (mEndRootView != null
&& mEndRootView.getVisibility() == VISIBLE) {
mEndRootView.setVisibility(View.GONE);
this.removeFooterView(mEndRootView);
}
}
/**
* 改变加载更多状态
*/
private void changeEndViewByState() {
if (mCanLoadMore) {
switch (mEndState) {
case ENDINT_LOADING: // 刷新中
if (mEndLoadTipsTextView.getText().equals(
R.string.p2refresh_doing_end_refresh)) {
break;
}
mEndLoadTipsTextView
.setText(R.string.p2refresh_doing_end_refresh);
mEndLoadTipsTextView.setVisibility(View.VISIBLE);
mEndLoadProgressBar.setVisibility(View.VISIBLE);
break;
case ENDINT_MANUAL_LOAD_DONE:// 手动刷新完成
mEndLoadTipsTextView
.setText(R.string.p2refresh_end_click_load_more);
mEndLoadTipsTextView.setVisibility(View.VISIBLE);
mEndLoadProgressBar.setVisibility(View.GONE);
mEndRootView.setVisibility(View.VISIBLE);
break;
case ENDINT_AUTO_LOAD_DONE:// 自动刷新完成
mEndLoadTipsTextView.setText(R.string.p2refresh_end_load_more);
mEndLoadTipsTextView.setVisibility(View.VISIBLE);
mEndLoadProgressBar.setVisibility(View.GONE);
mEndRootView.setVisibility(View.VISIBLE);
break;
default:
break;
}
}
}
/**
* 注意事项： 此方法不适用于ViewPager中， 方法为：直接调用pull2RefreshManually();
*/
@Override
public void onWindowFocusChanged(boolean pHasWindowFocus) {
super.onWindowFocusChanged(pHasWindowFocus);
if (mIsDoRefreshOnUIChanged) {
if (pHasWindowFocus) {
pull2RefreshManually();
}
}
}
/**
* 当该ListView所在的控件显示到屏幕上时，直接显示正在刷新...
*/
public void pull2RefreshManually() {
mHeadState = REFRESHING;
changeHeadViewByState();
onRefresh();
mIsRecored = false;
mIsBack = false;
}
/**
*/
public boolean onTouchEvent(MotionEvent event) {
if (mCanRefresh) {
if (mCanLoadMore && mEndState == ENDINT_LOADING) {
return super.onTouchEvent(event);
}
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if (mFirstItemIndex == 0 && !mIsRecored) {
mIsRecored = true;
mStartY = (int) event.getY();
} else if (mFirstItemIndex == 0 && mIsRecored) {
mStartY = (int) event.getY();
}
break;
case MotionEvent.ACTION_UP:
if (mHeadState != REFRESHING) {
if (mHeadState == DONE) {
}
if (mHeadState == PULL_TO_REFRESH) {
mHeadState = DONE;
changeHeadViewByState();
}
if (mHeadState == RELEASE_TO_REFRESH) {
mHeadState = REFRESHING;
changeHeadViewByState();
onRefresh();
}
}
mIsRecored = false;
mIsBack = false;
break;
case MotionEvent.ACTION_MOVE:
int _TempY = (int) event.getY();
if (!mIsRecored && mFirstItemIndex == 0) {
mIsRecored = true;
mStartY = _TempY;
}
if (mHeadState != REFRESHING && mIsRecored) {
if (mHeadState == RELEASE_TO_REFRESH) {
setSelection(0);
if (((_TempY - mStartY) / RATIO < mHeadViewHeight)
&& (_TempY - mStartY) > 0) {
mHeadState = PULL_TO_REFRESH;
changeHeadViewByState();
} else if (_TempY - mStartY <= 0) {
mHeadState = DONE;
changeHeadViewByState();
}
}
if (mHeadState == PULL_TO_REFRESH) {
setSelection(0);
if ((_TempY - mStartY) / RATIO >= mHeadViewHeight) {
mHeadState = RELEASE_TO_REFRESH;
mIsBack = true;
changeHeadViewByState();
} else if (_TempY - mStartY <= 0) {
mHeadState = DONE;
changeHeadViewByState();
}
}
if (mHeadState == DONE) {
if (_TempY - mStartY > 0) {
mHeadState = PULL_TO_REFRESH;
changeHeadViewByState();
}
}
if (mHeadState == PULL_TO_REFRESH) {
mHeadRootView.setPadding(0, -1 * mHeadViewHeight
+ (_TempY - mStartY) / RATIO, 0, 0);
}
if (mHeadState == RELEASE_TO_REFRESH) {
mHeadRootView.setPadding(0, (_TempY - mStartY) / RATIO
- mHeadViewHeight, 0, 0);
}
}
break;
}
}
return super.onTouchEvent(event);
}
/**
* 当HeadView状态改变时候，调用该方法，以更新界面
*/
private void changeHeadViewByState() {
switch (mHeadState) {
case RELEASE_TO_REFRESH:
mArrowImageView.setVisibility(View.VISIBLE);
mProgressBar.setVisibility(View.GONE);
mTipsTextView.setVisibility(View.VISIBLE);
// mLastUpdatedTextView.setVisibility(View.VISIBLE);
mArrowImageView.clearAnimation();
mArrowImageView.startAnimation(mArrowAnim);
mTipsTextView.setText(R.string.p2refresh_release_refresh);
break;
case PULL_TO_REFRESH:
mProgressBar.setVisibility(View.GONE);
mTipsTextView.setVisibility(View.VISIBLE);
// mLastUpdatedTextView.setVisibility(View.VISIBLE);
mArrowImageView.clearAnimation();
mArrowImageView.setVisibility(View.VISIBLE);
if (mIsBack) {
mIsBack = false;
mArrowImageView.clearAnimation();
mArrowImageView.startAnimation(mArrowReverseAnim);
mTipsTextView.setText(R.string.p2refresh_pull_to_refresh);
} else {
mTipsTextView.setText(R.string.p2refresh_pull_to_refresh);
}
break;
case REFRESHING:
changeHeaderViewRefreshState();
break;
case DONE:
mHeadRootView.setPadding(0, -1 * mHeadViewHeight, 0, 0);
mProgressBar.setVisibility(View.GONE);
mArrowImageView.clearAnimation();
// mArrowImageView.setImageResource(R.drawable.pulltorefresh_arrow);
mArrowImageView.setImageResource(R.drawable.arrow_gray);
mTipsTextView.setText(R.string.p2refresh_pull_to_refresh);
mLastUpdatedTextView.setVisibility(View.GONE);
break;
}
}
/**
* 改变HeadView在刷新状态下的显示
*/
private void changeHeaderViewRefreshState() {
mHeadRootView.setPadding(0, 0, 0, 0);
mProgressBar.setVisibility(View.VISIBLE);
mArrowImageView.clearAnimation();
mArrowImageView.setVisibility(View.GONE);
mTipsTextView.setText(R.string.p2refresh_doing_head_refresh);
mLastUpdatedTextView.setVisibility(View.VISIBLE);
}
/**
* 下拉刷新监听接口
*/
public interface OnRefreshListener {
public void onRefresh();
}
/**
* 加载更多监听接口
*/
public interface onl oadMoreListener {
public void onl oadMore();
}
public void setOnRefreshListener(OnRefreshListener pRefreshListener) {
if (pRefreshListener != null) {
mRefreshListener = pRefreshListener;
mCanRefresh = true;
}
}
public void setOnLoadListener(OnLoadMoreListener pLoadMoreListener) {
if (pLoadMoreListener != null) {
mLoadMoreListener = pLoadMoreListener;
mCanLoadMore = true;
if (mCanLoadMore && getFooterViewsCount() == 0) {
addFooterView();
}
}
}
/**
* 正在下拉刷新
*/
private void onRefresh() {
if (mRefreshListener != null) {
mRefreshListener.onRefresh();
}
}
/**
* 下拉刷新完成
*/
public void onRefreshComplete() {
mHeadState = DONE;
mLastUpdatedTextView.setText(getResources().getString(
R.string.p2refresh_refresh_lasttime)
+ new SimpleDateFormat(DATE_FORMAT_STR, Locale.CHINA)
.format(new Date()));
changeHeadViewByState();
if (mIsMoveToFirstItemAfterRefresh) {
mFirstItemIndex = 0;
setSelection(0);
}
}
/**
* 正在加载更多，FootView显示 ： 加载中...
*/
private void onl oadMore() {
if (mLoadMoreListener != null) {
mEndLoadTipsTextView.setText(R.string.p2refresh_doing_end_refresh);
mEndLoadTipsTextView.setVisibility(View.VISIBLE);
mEndLoadProgressBar.setVisibility(View.VISIBLE);
mLoadMoreListener.onLoadMore();
}
}
/**
* 加载更多完成
*/
public void onl oadMoreComplete() {
if (mIsAutoLoadMore) {
mEndState = ENDINT_AUTO_LOAD_DONE;
} else {
mEndState = ENDINT_MANUAL_LOAD_DONE;
}
changeEndViewByState();
}
/**
* 主要更新一下刷新时间啦！
*/
public void setAdapter(BaseAdapter adapter) {
mLastUpdatedTextView.setText(getResources().getString(
R.string.p2refresh_refresh_lasttime)
+ new SimpleDateFormat(DATE_FORMAT_STR, Locale.CHINA)
.format(new Date()));
super.setAdapter(adapter);
}
public void setEndRootViewVisibility(boolean b) {
if (mEndRootView == null) {
return;
}
if (getFooterViewsCount() == 0 && b) {
addFooterView();
} else {
removeFooterView(mEndRootView);
}
}
public View getFooterView() {
return mEndRootView;
}
}
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