android ScrollView,GridView,ListView,ViewGroup均可上拉刷新的控件XScrollView（项目必用）
android ScrollView,GridView,ListView,ViewGroup均可下拉刷新的控件XScrollView（项目必用）
public class XScrollView extends ScrollView implements OnScrollListener {
private float mLastY = -1; // save event y
/**
* 这个类封装了滚动操作。 滚动的持续时间可以通过构造函数传递，并且可以指定滚动动作的持续的最长时间。
* 经过这段时间，滚动会自动定位到最终位置，并且通过computeScrollOffset()会得到的返回值为false，表明滚动动作已经结束。
**/
private Scroller mScroller; // used for scroll back
/**
* 当屏幕停止滚动时为0； 当屏幕滚动且用户使用的触碰或手指还在屏幕上时为1； 由于用户的操作，屏幕产生惯性滑动时为2
*/
private OnScrollListener mScrollListener; // user's scroll listener
// the interface to trigger refresh and load more.
private IXScrollViewListener mScorllViewListener;
// -- header view
private XListViewHeader mHeaderView;
// header view content, use it to calculate the Header's height. And hide it
// when disable pull refresh.
private RelativeLayout mHeaderViewContent;
private TextView mHeaderTimeView;
private int mHeaderViewHeight; // header view's height
private boolean mEnablePullRefresh = true;
private boolean mPullRefreshing = false; // is refreashing.
private LinearLayout mScrollView;
private LinearLayout mContentView;
// -- footer view
private XListViewFooter mFooterView;
private boolean mEnablePullLoad;
private boolean mPullLoading;
// total list items, used to detect is at the bottom of listview.
private int mTotalItemCount;
// for mScroller, scroll back from header or footer.
private int mScrollBack;
private final static int SCROLLBACK_HEADER = 0;
private final static int SCROLLBACK_FOOTER = 1;
private final static int SCROLL_DURATION = 400; // scroll back duration
private final static int PULL_LOAD_MORE_DELTA = 50; // when pull up >= 50px
// at bottom, trigger
// load more.
private final static float OFFSET_RADIO = 1.8f; // support iOS like pull
// feature.
public XScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
Log.e("LIFE", "initWithContext");
initWithContext(context);
}
private void initWithContext(Context context) {
mScrollView = (LinearLayout) View.inflate(context,
R.layout.xscrollview_layout, null);
mContentView = (LinearLayout) mScrollView.findViewById(R.id.sc_layout);
/**
* http://www.cnblogs.com/feisky/archive/2010/01/11/1644482.html详解：
* DecelerateInterpolator
*/
mScroller = new Scroller(context, new DecelerateInterpolator());
// XListView need the scroll event, and it will dispatch the event to
// user's listener (as a proxy).
this.setOnScrollListener(this);
// init header view
mHeaderView = new XListViewHeader(context);
mHeaderViewContent = (RelativeLayout) mHeaderView
.findViewById(R.id.xlistview_header_content);
mHeaderTimeView = (TextView) mHeaderView
.findViewById(R.id.xlistview_header_time);
addHeaderView(mHeaderView);
// init footer view
mFooterView = new XListViewFooter(context);
addFooterView(mFooterView);
// init header height
/**
* 有时候需要在onCreate方法中知道某个View组件的宽度和高度等信息，而直接调用View组件的getWidth()、getHeight
* ()、getMeasuredWidth()、getMeasuredHeight()、getTop()、getLeft()
* 等方法是无法获取到真实值的，只会得到0。这是因为View组件布局要在onResume回调后完成。下面提供实现方法，
* onGlobalLayout回调会在布局完成时自动调用
*/
mHeaderView.getViewTreeObserver().addOnGlobalLayoutListener(
new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
mHeaderViewHeight = mHeaderViewContent.getHeight();
getViewTreeObserver()
.removeGlobalOnLayoutListener(this);
Log.v("onGlobalLayout",
"-----------removeGlobalOnLayoutListener--------------");
}
});
this.addView(mScrollView);
}
private void addHeaderView(XListViewHeader mHeaderView) {
if (mScrollView == null) {
return;
}
LinearLayout mHeadLayout = (LinearLayout) mScrollView
.findViewById(R.id.sc_head);
mHeadLayout.addView(mHeaderView);
}
private void addFooterView(XListViewFooter mFooterView) {
if (mScrollView == null) {
return;
}
LinearLayout mFootLayout = (LinearLayout) mScrollView
.findViewById(R.id.sc_foot);
mFootLayout.addView(mFooterView);
}
/**
* 设置ScrollView 中间容器的View;
* @param contentView 要添加的ViewGroup
*/
public void setContentView(ViewGroup contentView) {
if (mScrollView == null) {
return;
}
if(mContentView == null){
mContentView = (LinearLayout) mScrollView.findViewById(R.id.sc_layout);
}
if(mContentView.getChildCount() > 0){
mContentView.removeAllViews();
}
mContentView.addView(contentView);
}
/**
* 设置ScrollView 中间容器的View;
* @param contentView 要添加的ViewGroup
*/
public void setView(View contentView) {
if (mScrollView == null) {
return;
}
if(mContentView == null){
mContentView = (LinearLayout) mScrollView.findViewById(R.id.sc_layout);
}
mContentView.addView(contentView);
}
/**
* enable or disable pull down refresh feature.
* @param enable
*/
public void setPullRefreshEnable(boolean enable) {
mEnablePullRefresh = enable;
if (!mEnablePullRefresh) { // disable, hide the content
mHeaderViewContent.setVisibility(View.INVISIBLE);
} else {
mHeaderViewContent.setVisibility(View.VISIBLE);
}
}
/**
* enable or disable pull up load more feature.
* @param enable
*/
public void setPullLoadEnable(boolean enable) {
mEnablePullLoad = enable;
if (!mEnablePullLoad) {
mFooterView.hide();
mFooterView.setOnClickListener(null);
} else {
mPullLoading = false;
mFooterView.show();
mFooterView.setState(XListViewFooter.STATE_NORMAL);
// both "pull up" and "click" will invoke load more.
mFooterView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
startLoadMore();
}
});
}
}
/**
* stop refresh, reset header view.
*/
public void stopRefresh() {
if (mPullRefreshing == true) {
mPullRefreshing = false;
resetHeaderHeight();
}
}
/**
* stop load more, reset footer view.
*/
public void stopLoadMore() {
if (mPullLoading == true) {
mPullLoading = false;
mFooterView.setState(XListViewFooter.STATE_NORMAL);
}
}
/**
* set last refresh time
*
* @param time
*/
public void setRefreshTime(String time) {
mHeaderTimeView.setText(time);
}
private void invokeOnScrolling() {
if (mScrollListener instanceof OnXScrollListener) {
OnXScrollListener l = (OnXScrollListener) mScrollListener;
l.onXScrolling(this);
}
}
private void updateHeaderHeight(float delta) {
mHeaderView.setVisiableHeight((int) delta
+ mHeaderView.getVisiableHeight());
if (mEnablePullRefresh && !mPullRefreshing) { // 未处于刷新状态，更新箭头
if (mHeaderView.getVisiableHeight() > mHeaderViewHeight) {
mHeaderView.setState(XListViewHeader.STATE_READY);
} else {
mHeaderView.setState(XListViewHeader.STATE_NORMAL);
}
}
// setSelection(0); // scroll to top each time
}
/**
* reset header view's height.
*/
private void resetHeaderHeight() {
int height = mHeaderView.getVisiableHeight();
if (height == 0) // not visible.
return;
// refreshing and header isn't shown fully. do nothing.
if (mPullRefreshing && height <= mHeaderViewHeight) {
return;
}
int finalHeight = 0; // default: scroll back to dismiss header.
// is refreshing, just scroll back to show all the header.
if (mPullRefreshing && height > mHeaderViewHeight) {
finalHeight = mHeaderViewHeight;
}
mScrollBack = SCROLLBACK_HEADER;
mScroller.startScroll(0, height, 0, finalHeight - height,
SCROLL_DURATION);
// trigger computeScroll
invalidate();
}
private void updateFooterHeight(float delta) {
int height = mFooterView.getBottomMargin() + (int) delta;
if (mEnablePullLoad && !mPullLoading) {
if (height > PULL_LOAD_MORE_DELTA) { // height enough to invoke load
// more.
mFooterView.setState(XListViewFooter.STATE_READY);
} else {
mFooterView.setState(XListViewFooter.STATE_NORMAL);
}
}
mFooterView.setBottomMargin(height);
// setSelection(mTotalItemCount - 1); // scroll to bottom
}
private void resetFooterHeight() {
int bottomMargin = mFooterView.getBottomMargin();
if (bottomMargin > 0) {
mScrollBack = SCROLLBACK_FOOTER;
mScroller.startScroll(0, bottomMargin, 0, -bottomMargin,
SCROLL_DURATION);
invalidate();
}
}
private void startLoadMore() {
mPullLoading = true;
mFooterView.setState(XListViewFooter.STATE_LOADING);
if (mScorllViewListener != null) {
mScorllViewListener.onLoadMore();
}
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
Log.e("LIFE", "onTouchEvent(MotionEvent ev)");
if (mLastY == -1) {
/**
* getX()是表示Widget相对于自身左上角的x坐标,而getRawX()是表示相对于屏幕左上角的x坐标值
* (注意:这个屏幕左上角是手机屏幕左上角,不管activity是否有titleBar或是否全屏幕)
*/
mLastY = ev.getRawY();
}
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
mLastY = ev.getRawY();
break;
case MotionEvent.ACTION_MOVE:
final float deltaY = ev.getRawY() - mLastY;
mLastY = ev.getRawY();
if (getFirstVisiblePosition() == 0
&& (mHeaderView.getVisiableHeight() > 0 || deltaY > 0)) {
// the first item is showing, header has shown or pull down.
updateHeaderHeight(deltaY / OFFSET_RADIO);
invokeOnScrolling();
} else if (getLastVisiblePosition() == mTotalItemCount - 1
&& (mFooterView.getBottomMargin() > 0 || deltaY < 0)) {
// last item, already pulled up or want to pull up.
updateFooterHeight(-deltaY / OFFSET_RADIO);
}
break;
default:
mLastY = -1; // reset
if (getFirstVisiblePosition() == 0) {
// invoke refresh
if (mEnablePullRefresh
&& mHeaderView.getVisiableHeight() > mHeaderViewHeight) {
mPullRefreshing = true;
mHeaderView.setState(XListViewHeader.STATE_REFRESHING);
if (mScorllViewListener != null) {
mScorllViewListener.onRefresh();
}
}
resetHeaderHeight();
} else if (getLastVisiblePosition() == mTotalItemCount - 1) {
// invoke load more.
if (mEnablePullLoad
&& mFooterView.getBottomMargin() > PULL_LOAD_MORE_DELTA) {
startLoadMore();
}
resetFooterHeight();
}
break;
}
return super.onTouchEvent(ev);
}
private int getFirstVisiblePosition() {
return 0;
}
private int getLastVisiblePosition() {
return 0;
}
/** 由父视图调用用来请求子视图根据偏移值 mScrollX,mScrollY重新绘制 **/
@Override
public void computeScroll() {
Log.e("LIFE", "computeScroll() ");
/**
* 当startScroll执行过程中即在duration时间内，computeScrollOffset
* 方法会一直返回false，但当动画执行完成后会返回返加true.
*/
if (mScroller.computeScrollOffset()) {
if (mScrollBack == SCROLLBACK_HEADER) {
mHeaderView.setVisiableHeight(mScroller.getCurrY());
} else {
mFooterView.setBottomMargin(mScroller.getCurrY());
}
postInvalidate();
invokeOnScrolling();
}
super.computeScroll();
}
public void setOnScrollListener(OnScrollListener l) {
Log.e("LIFE", "setOnScrollListener");
mScrollListener = l;
}
/**
* 正在滚动时回调，回调2-3次，手指没抛则回调2次。scrollState = 2的这次不回调 //回调顺序如下 //第1次：scrollState
* = SCROLL_STATE_TOUCH_SCROLL(1) 正在滚动 //第2次：scrollState =
* SCROLL_STATE_FLING(2) 手指做了抛的动作（手指离开屏幕前，用力滑了一下） //第3次：scrollState =
* SCROLL_STATE_IDLE(0) 停止滚动 //当屏幕停止滚动时为0；当屏幕滚动且用户使用的触碰或手指还在屏幕上时为1；
* //由于用户的操作，屏幕产生惯性滑动时为2 //当滚到最后一行且停止滚动时，执行加载
**/
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
Log.e("LIFE", "onScrollStateChanged");
if (scrollState == SCROLL_STATE_TOUCH_SCROLL) {
Log.e("scrollState", "正在滚动 ");
}
if (scrollState == SCROLL_STATE_FLING) {
Log.e("scrollState", " 手指做了抛的动作（手指离开屏幕前，用力滑了一下） ");
}
if (scrollState == SCROLL_STATE_IDLE) {
Log.e("scrollState", "停止滚动 ");
}
if (mScrollListener != null) {
mScrollListener.onScrollStateChanged(view, scrollState);
}
}
/**
* 滚动时一直回调，直到停止滚动时才停止回调。单击时回调一次。 firstVisibleItem：当前能看见的第一个列表项ID（从0开始）
* visibleItemCount：当前能看见的列表项个数（小半个也算） totalItemCount：列表项共数
*/
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
Log.e("LIFE", "onScroll");
// send to user's listener
mTotalItemCount = totalItemCount;
if (mScrollListener != null) {
mScrollListener.onScroll(view, firstVisibleItem, visibleItemCount,
totalItemCount);
}
}
public void setIXScrollViewListener(IXScrollViewListener l) {
mScorllViewListener = l;
}
/**
* you can listen ListView.OnScrollListener or this one. it will invoke
* onXScrolling when header/footer scroll back.
*/
public interface OnXScrollListener extends OnScrollListener {
public void onXScrolling(View view);
}
/**
* implements this interface to get refresh/load more event.
*/
public interface IXScrollViewListener {
public void onRefresh();
public void onLoadMore();
}
}
先上图，看看是不是你要的效果？ 是，继续走！
实现该功能需要实现注意三点：
1：下拉刷新的效果实现；
2：scrollview中图片画廊的添加（不用管你是gallery还是gridview）
3:上推刷新的时候，底部转圈等待的效果，没有数据显示加载完毕功能；
(代码在：http://download.csdn.net/my/uploads )
具体实现：
1：先说使用方法：
public class XScrollViewActivity extends Activity {
private XScrollView mScrollView;
private Handler mHandler;
private Context mContext = XScrollViewActivity.this;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mScrollView = (XScrollView) findViewById(R.id.xListView);
mScrollView.setPullLoadEnable(true);
mScrollView.setIXScrollViewListener(mIXScrollViewListener);
mHandler = new Handler();
}
private void onLoad() {
mScrollView.stopRefresh();
mScrollView.stopLoadMore();
mScrollView.setRefreshTime("刚刚");
}
IXScrollViewListener mIXScrollViewListener = new IXScrollViewListener() {
@Override
public void onRefresh() {
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
TextView mTextView = new TextView(mContext);
mTextView.setText("YAMAHA");
mScrollView.setView(mTextView);
onLoad();
}
}, 2000);
}
@Override
public void onLoadMore() {
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
TextView mTextView = new TextView(mContext);
mTextView.setText("YAMAHA");
mScrollView.setView(mTextView);
onLoad();
}
}, 2000);
}
};
}
private XScrollView mScrollView;
private Handler mHandler;
private Context mContext = XScrollViewActivity.this;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mScrollView = (XScrollView) findViewById(R.id.xListView);
mScrollView.setPullLoadEnable(true);
mScrollView.setIXScrollViewListener(mIXScrollViewListener);
mHandler = new Handler();
}
private void onLoad() {
mScrollView.stopRefresh();
mScrollView.stopLoadMore();
mScrollView.setRefreshTime("刚刚");
}
IXScrollViewListener mIXScrollViewListener = new IXScrollViewListener() {
@Override
public void onRefresh() {
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
TextView mTextView = new TextView(mContext);
mTextView.setText("YAMAHA");
mScrollView.setView(mTextView);
onLoad();
}
}, 2000);
}
@Override
public void onLoadMore() {
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
TextView mTextView = new TextView(mContext);
mTextView.setText("YAMAHA");
mScrollView.setView(mTextView);
onLoad();
}
}, 2000);
}
};
}
2：布局引用：
<?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:orientation="vertical" android:background="#f0f0f0">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<!-- <me.maxwin.view.XListView -->
<!-- android:id="@+id/xListView" -->
<!-- android:layout_width="fill_parent" -->
<!-- android:layout_height="fill_parent" android:cacheColorHint="#00000000"> -->
<!-- </me.maxwin.view.XListView> -->
<me.maxwin.view.XScrollView
android:id="@+id/xListView"
android:layout_width="fill_parent"
android:layout_height="fill_parent" android:cacheColorHint="#00000000">
</me.maxwin.view.XScrollView>
</LinearLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" android:background="#f0f0f0">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<!-- <me.maxwin.view.XListView -->
<!-- android:id="@+id/xListView" -->
<!-- android:layout_width="fill_parent" -->
<!-- android:layout_height="fill_parent" android:cacheColorHint="#00000000"> -->
<!-- </me.maxwin.view.XListView> -->
<me.maxwin.view.XScrollView
android:id="@+id/xListView"
android:layout_width="fill_parent"
android:layout_height="fill_parent" android:cacheColorHint="#00000000">
</me.maxwin.view.XScrollView>
</LinearLayout>
3：看封装的控件
public class XScrollView extends ScrollView implements OnScrollListener {
private float mLastY = -1; // save event y
/**
* 这个类封装了滚动操作。 滚动的持续时间可以通过构造函数传递，并且可以指定滚动动作的持续的最长时间。
* 经过这段时间，滚动会自动定位到最终位置，并且通过computeScrollOffset()会得到的返回值为false，表明滚动动作已经结束。
**/
private Scroller mScroller; // used for scroll back
/**
* 当屏幕停止滚动时为0； 当屏幕滚动且用户使用的触碰或手指还在屏幕上时为1； 由于用户的操作，屏幕产生惯性滑动时为2
*/
private OnScrollListener mScrollListener; // user's scroll listener
// the interface to trigger refresh and load more.
private IXScrollViewListener mScorllViewListener;
// -- header view
private XListViewHeader mHeaderView;
// header view content, use it to calculate the Header's height. And hide it
// when disable pull refresh.
private RelativeLayout mHeaderViewContent;
private TextView mHeaderTimeView;
private int mHeaderViewHeight; // header view's height
private boolean mEnablePullRefresh = true;
private boolean mPullRefreshing = false; // is refreashing.
private LinearLayout mScrollView;
private LinearLayout mContentView;
// -- footer view
private XListViewFooter mFooterView;
private boolean mEnablePullLoad;
private boolean mPullLoading;
// total list items, used to detect is at the bottom of listview.
private int mTotalItemCount;
// for mScroller, scroll back from header or footer.
private int mScrollBack;
private final static int SCROLLBACK_HEADER = 0;
private final static int SCROLLBACK_FOOTER = 1;
private final static int SCROLL_DURATION = 400; // scroll back duration
private final static int PULL_LOAD_MORE_DELTA = 50; // when pull up >= 50px
// at bottom, trigger
// load more.
private final static float OFFSET_RADIO = 1.8f; // support iOS like pull
// feature.
public XScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
Log.e("LIFE", "initWithContext");
initWithContext(context);
}
private void initWithContext(Context context) {
mScrollView = (LinearLayout) View.inflate(context,
R.layout.xscrollview_layout, null);
mContentView = (LinearLayout) mScrollView.findViewById(R.id.sc_layout);
/**
* http://www.cnblogs.com/feisky/archive/2010/01/11/1644482.html详解：
* DecelerateInterpolator
*/
mScroller = new Scroller(context, new DecelerateInterpolator());
// XListView need the scroll event, and it will dispatch the event to
// user's listener (as a proxy).
this.setOnScrollListener(this);
// init header view
mHeaderView = new XListViewHeader(context);
mHeaderViewContent = (RelativeLayout) mHeaderView
.findViewById(R.id.xlistview_header_content);
mHeaderTimeView = (TextView) mHeaderView
.findViewById(R.id.xlistview_header_time);
addHeaderView(mHeaderView);
// init footer view
mFooterView = new XListViewFooter(context);
addFooterView(mFooterView);
// init header height
/**
* 有时候需要在onCreate方法中知道某个View组件的宽度和高度等信息，而直接调用View组件的getWidth()、getHeight
* ()、getMeasuredWidth()、getMeasuredHeight()、getTop()、getLeft()
* 等方法是无法获取到真实值的，只会得到0。这是因为View组件布局要在onResume回调后完成。下面提供实现方法，
* onGlobalLayout回调会在布局完成时自动调用
*/
mHeaderView.getViewTreeObserver().addOnGlobalLayoutListener(
new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
mHeaderViewHeight = mHeaderViewContent.getHeight();
getViewTreeObserver()
.removeGlobalOnLayoutListener(this);
Log.v("onGlobalLayout",
"-----------removeGlobalOnLayoutListener--------------");
}
});
this.addView(mScrollView);
}
private void addHeaderView(XListViewHeader mHeaderView) {
if (mScrollView == null) {
return;
}
LinearLayout mHeadLayout = (LinearLayout) mScrollView
.findViewById(R.id.sc_head);
mHeadLayout.addView(mHeaderView);
}
private void addFooterView(XListViewFooter mFooterView) {
if (mScrollView == null) {
return;
}
LinearLayout mFootLayout = (LinearLayout) mScrollView
.findViewById(R.id.sc_foot);
mFootLayout.addView(mFooterView);
}
/**
* 设置ScrollView 中间容器的View;
* @param contentView 要添加的ViewGroup
*/
public void setContentView(ViewGroup contentView) {
if (mScrollView == null) {
return;
}
if(mContentView == null){
mContentView = (LinearLayout) mScrollView.findViewById(R.id.sc_layout);
}
if(mContentView.getChildCount() > 0){
mContentView.removeAllViews();
}
mContentView.addView(contentView);
}
/**
* 设置ScrollView 中间容器的View;
* @param contentView 要添加的ViewGroup
*/
public void setView(View contentView) {
if (mScrollView == null) {
return;
}
if(mContentView == null){
mContentView = (LinearLayout) mScrollView.findViewById(R.id.sc_layout);
}
mContentView.addView(contentView);
}
/**
* enable or disable pull down refresh feature.
* @param enable
*/
public void setPullRefreshEnable(boolean enable) {
mEnablePullRefresh = enable;
if (!mEnablePullRefresh) { // disable, hide the content
mHeaderViewContent.setVisibility(View.INVISIBLE);
} else {
mHeaderViewContent.setVisibility(View.VISIBLE);
}
}
/**
* enable or disable pull up load more feature.
* @param enable
*/
public void setPullLoadEnable(boolean enable) {
mEnablePullLoad = enable;
if (!mEnablePullLoad) {
mFooterView.hide();
mFooterView.setOnClickListener(null);
} else {
mPullLoading = false;
mFooterView.show();
mFooterView.setState(XListViewFooter.STATE_NORMAL);
// both "pull up" and "click" will invoke load more.
mFooterView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
startLoadMore();
}
});
}
}
/**
* stop refresh, reset header view.
*/
public void stopRefresh() {
if (mPullRefreshing == true) {
mPullRefreshing = false;
resetHeaderHeight();
}
}
/**
* stop load more, reset footer view.
*/
public void stopLoadMore() {
if (mPullLoading == true) {
mPullLoading = false;
mFooterView.setState(XListViewFooter.STATE_NORMAL);
}
}
/**
* set last refresh time
*
* @param time
*/
public void setRefreshTime(String time) {
mHeaderTimeView.setText(time);
}
private void invokeOnScrolling() {
if (mScrollListener instanceof OnXScrollListener) {
OnXScrollListener l = (OnXScrollListener) mScrollListener;
l.onXScrolling(this);
}
}
private void updateHeaderHeight(float delta) {
mHeaderView.setVisiableHeight((int) delta
+ mHeaderView.getVisiableHeight());
if (mEnablePullRefresh && !mPullRefreshing) { // 未处于刷新状态，更新箭头
if (mHeaderView.getVisiableHeight() > mHeaderViewHeight) {
mHeaderView.setState(XListViewHeader.STATE_READY);
} else {
mHeaderView.setState(XListViewHeader.STATE_NORMAL);
}
}
// setSelection(0); // scroll to top each time
}
/**
* reset header view's height.
*/
private void resetHeaderHeight() {
int height = mHeaderView.getVisiableHeight();
if (height == 0) // not visible.
return;
// refreshing and header isn't shown fully. do nothing.
if (mPullRefreshing && height <= mHeaderViewHeight) {
return;
}
int finalHeight = 0; // default: scroll back to dismiss header.
// is refreshing, just scroll back to show all the header.
if (mPullRefreshing && height > mHeaderViewHeight) {
finalHeight = mHeaderViewHeight;
}
mScrollBack = SCROLLBACK_HEADER;
mScroller.startScroll(0, height, 0, finalHeight - height,
SCROLL_DURATION);
// trigger computeScroll
invalidate();
}
private void updateFooterHeight(float delta) {
int height = mFooterView.getBottomMargin() + (int) delta;
if (mEnablePullLoad && !mPullLoading) {
if (height > PULL_LOAD_MORE_DELTA) { // height enough to invoke load
// more.
mFooterView.setState(XListViewFooter.STATE_READY);
} else {
mFooterView.setState(XListViewFooter.STATE_NORMAL);
}
}
mFooterView.setBottomMargin(height);
// setSelection(mTotalItemCount - 1); // scroll to bottom
}
private void resetFooterHeight() {
int bottomMargin = mFooterView.getBottomMargin();
if (bottomMargin > 0) {
mScrollBack = SCROLLBACK_FOOTER;
mScroller.startScroll(0, bottomMargin, 0, -bottomMargin,
SCROLL_DURATION);
invalidate();
}
}
private void startLoadMore() {
mPullLoading = true;
mFooterView.setState(XListViewFooter.STATE_LOADING);
if (mScorllViewListener != null) {
mScorllViewListener.onLoadMore();
}
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
Log.e("LIFE", "onTouchEvent(MotionEvent ev)");
if (mLastY == -1) {
/**
* getX()是表示Widget相对于自身左上角的x坐标,而getRawX()是表示相对于屏幕左上角的x坐标值
* (注意:这个屏幕左上角是手机屏幕左上角,不管activity是否有titleBar或是否全屏幕)
*/
mLastY = ev.getRawY();
}
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
mLastY = ev.getRawY();
break;
case MotionEvent.ACTION_MOVE:
final float deltaY = ev.getRawY() - mLastY;
mLastY = ev.getRawY();
if (getFirstVisiblePosition() == 0
&& (mHeaderView.getVisiableHeight() > 0 || deltaY > 0)) {
// the first item is showing, header has shown or pull down.
updateHeaderHeight(deltaY / OFFSET_RADIO);
invokeOnScrolling();
} else if (getLastVisiblePosition() == mTotalItemCount - 1
&& (mFooterView.getBottomMargin() > 0 || deltaY < 0)) {
// last item, already pulled up or want to pull up.
updateFooterHeight(-deltaY / OFFSET_RADIO);
}
break;
default:
mLastY = -1; // reset
if (getFirstVisiblePosition() == 0) {
// invoke refresh
if (mEnablePullRefresh
&& mHeaderView.getVisiableHeight() > mHeaderViewHeight) {
mPullRefreshing = true;
mHeaderView.setState(XListViewHeader.STATE_REFRESHING);
if (mScorllViewListener != null) {
mScorllViewListener.onRefresh();
}
}
resetHeaderHeight();
} else if (getLastVisiblePosition() == mTotalItemCount - 1) {
// invoke load more.
if (mEnablePullLoad
&& mFooterView.getBottomMargin() > PULL_LOAD_MORE_DELTA) {
startLoadMore();
}
resetFooterHeight();
}
break;
}
return super.onTouchEvent(ev);
}
private int getFirstVisiblePosition() {
return 0;
}
private int getLastVisiblePosition() {
return 0;
}
/** 由父视图调用用来请求子视图根据偏移值 mScrollX,mScrollY重新绘制 **/
@Override
public void computeScroll() {
Log.e("LIFE", "computeScroll() ");
/**
* 当startScroll执行过程中即在duration时间内，computeScrollOffset
* 方法会一直返回false，但当动画执行完成后会返回返加true.
*/
if (mScroller.computeScrollOffset()) {
if (mScrollBack == SCROLLBACK_HEADER) {
mHeaderView.setVisiableHeight(mScroller.getCurrY());
} else {
mFooterView.setBottomMargin(mScroller.getCurrY());
}
postInvalidate();
invokeOnScrolling();
}
super.computeScroll();
}
public void setOnScrollListener(OnScrollListener l) {
Log.e("LIFE", "setOnScrollListener");
mScrollListener = l;
}
/**
* 正在滚动时回调，回调2-3次，手指没抛则回调2次。scrollState = 2的这次不回调 //回调顺序如下 //第1次：scrollState
* = SCROLL_STATE_TOUCH_SCROLL(1) 正在滚动 //第2次：scrollState =
* SCROLL_STATE_FLING(2) 手指做了抛的动作（手指离开屏幕前，用力滑了一下） //第3次：scrollState =
* SCROLL_STATE_IDLE(0) 停止滚动 //当屏幕停止滚动时为0；当屏幕滚动且用户使用的触碰或手指还在屏幕上时为1；
* //由于用户的操作，屏幕产生惯性滑动时为2 //当滚到最后一行且停止滚动时，执行加载
**/
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
Log.e("LIFE", "onScrollStateChanged");
if (scrollState == SCROLL_STATE_TOUCH_SCROLL) {
Log.e("scrollState", "正在滚动 ");
}
if (scrollState == SCROLL_STATE_FLING) {
Log.e("scrollState", " 手指做了抛的动作（手指离开屏幕前，用力滑了一下） ");
}
if (scrollState == SCROLL_STATE_IDLE) {
Log.e("scrollState", "停止滚动 ");
}
if (mScrollListener != null) {
mScrollListener.onScrollStateChanged(view, scrollState);
}
}
/**
* 滚动时一直回调，直到停止滚动时才停止回调。单击时回调一次。 firstVisibleItem：当前能看见的第一个列表项ID（从0开始）
* visibleItemCount：当前能看见的列表项个数（小半个也算） totalItemCount：列表项共数
*/
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
Log.e("LIFE", "onScroll");
// send to user's listener
mTotalItemCount = totalItemCount;
if (mScrollListener != null) {
mScrollListener.onScroll(view, firstVisibleItem, visibleItemCount,
totalItemCount);
}
}
public void setIXScrollViewListener(IXScrollViewListener l) {
mScorllViewListener = l;
}
/**
* you can listen ListView.OnScrollListener or this one. it will invoke
* onXScrolling when header/footer scroll back.
*/
public interface OnXScrollListener extends OnScrollListener {
public void onXScrolling(View view);
}
/**
* implements this interface to get refresh/load more event.
*/
public interface IXScrollViewListener {
public void onRefresh();
public void onLoadMore();
}
}
以上是根据XListView-Android-master 例子的改装，解决在scrollview中可以添加任何你想加的控件来进行下拉刷新功能；
有不足之处请指正！