@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mLastY == -1) {
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 && (mHeader.getVisibleHeight() > 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:
// reset
mLastY = -1;
if (getFirstVisiblePosition() == 0) {
// invoke refresh
if (mEnablePullRefresh && mHeader.getVisibleHeight() > mHeaderHeight) {
mPullRefreshing = true;
mHeader.setState(XHeaderView.STATE_REFRESHING);
refresh();
}
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 void initWithContext(Context context) {
mLayout = (LinearLayout) View.inflate(context, R.layout.vw_xscrollview_layout, null);
mContentLayout = (LinearLayout) mLayout.findViewById(R.id.content_layout);
mScroller = new Scroller(context, new DecelerateInterpolator());
// XScrollView need the scroll event, and it will dispatch the event to user's listener (as a
// proxy).
this.setOnScrollListener(this);
// init header view
mHeader = new XHeaderView(context);
mHeaderContent = (RelativeLayout) mHeader.findViewById(R.id.header_content);
mHeaderTime = (TextView) mHeader.findViewById(R.id.header_hint_time);
LinearLayout headerLayout = (LinearLayout) mLayout.findViewById(R.id.header_layout);
headerLayout.addView(mHeader);
// init footer view
mFooterView = new XFooterView(context);
LinearLayout.LayoutParams params =
new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
params.gravity = Gravity.CENTER;
LinearLayout footLayout = (LinearLayout) mLayout.findViewById(R.id.footer_layout);
footLayout.addView(mFooterView, params);
// init header height
ViewTreeObserver observer = mHeader.getViewTreeObserver();
if (null != observer) {
observer.addOnGlobalLayoutListener(
new OnGlobalLayoutListener() {
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
@SuppressWarnings("deprecation")
@Override
public void onGlobalLayout() {
mHeaderHeight = mHeaderContent.getHeight();
ViewTreeObserver observer = getViewTreeObserver();
if (null != observer) {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
observer.removeGlobalOnLayoutListener(this);
} else {
observer.removeOnGlobalLayoutListener(this);
}
}
}
});
}
this.addView(mLayout);
}
private void updateHeaderHeight(float delta) {
mHeader.setVisibleHeight((int) delta + mHeader.getVisibleHeight());
if (mEnablePullRefresh && !mPullRefreshing) {
// update the arrow image unrefreshing
if (mHeader.getVisibleHeight() > mHeaderHeight) {
mHeader.setState(XHeaderView.STATE_READY);
} else {
mHeader.setState(XHeaderView.STATE_NORMAL);
}
}
// scroll to top each time
setSelection(0);
}
/** Auto call back refresh. */
public void autoRefresh() {
mHeader.setVisibleHeight(mHeaderHeight);
if (mEnablePullRefresh && !mPullRefreshing) {
// update the arrow image not refreshing
if (mHeader.getVisibleHeight() > mHeaderHeight) {
mHeader.setState(XHeaderView.STATE_READY);
} else {
mHeader.setState(XHeaderView.STATE_NORMAL);
}
}
mPullRefreshing = true;
mHeader.setState(XHeaderView.STATE_REFRESHING);
refresh();
}
private void resetHeaderOrBottom() {
if (isTop()) {
// invoke refresh
if (mEnablePullRefresh && mHeader.getVisibleHeight() > mHeaderHeight) {
mPullRefreshing = true;
mHeader.setState(XHeaderView.STATE_REFRESHING);
refresh();
}
resetHeaderHeight();
} else if (isBottom()) {
// invoke load more.
if (mEnablePullLoad && mFooterView.getBottomMargin() > PULL_LOAD_MORE_DELTA) {
startLoadMore();
}
resetFooterHeight();
}
}
private void initWithContext(Context context) {
mScroller = new Scroller(context, new DecelerateInterpolator());
super.setOnScrollListener(this);
// init header view
mHeader = new XHeaderView(context);
mHeaderContent = (RelativeLayout) mHeader.findViewById(R.id.header_content);
mHeaderTime = (TextView) mHeader.findViewById(R.id.header_hint_time);
addHeaderView(mHeader);
// init footer view
mFooterView = new XFooterView(context);
mFooterLayout = new LinearLayout(context);
LinearLayout.LayoutParams params =
new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
params.gravity = Gravity.CENTER;
mFooterLayout.addView(mFooterView, params);
// init header height
ViewTreeObserver observer = mHeader.getViewTreeObserver();
if (null != observer) {
observer.addOnGlobalLayoutListener(
new OnGlobalLayoutListener() {
@SuppressWarnings("deprecation")
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
@Override
public void onGlobalLayout() {
mHeaderHeight = mHeaderContent.getHeight();
ViewTreeObserver observer = getViewTreeObserver();
if (null != observer) {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
observer.removeGlobalOnLayoutListener(this);
} else {
observer.removeOnGlobalLayoutListener(this);
}
}
}
});
}
}
private void updateHeaderHeight(float delta) {
mHeader.setVisibleHeight((int) delta + mHeader.getVisibleHeight());
if (mEnablePullRefresh && !mPullRefreshing) {
// update the arrow image unrefreshing
if (mHeader.getVisibleHeight() > mHeaderHeight) {
mHeader.setState(XHeaderView.STATE_READY);
} else {
mHeader.setState(XHeaderView.STATE_NORMAL);
}
}
// scroll to top each time
post(
new Runnable() {
@Override
public void run() {
XScrollView.this.fullScroll(ScrollView.FOCUS_UP);
}
});
}
@Override
public void computeScroll() {
if (mScroller.computeScrollOffset()) {
if (mScrollBack == SCROLL_BACK_HEADER) {
mHeader.setVisibleHeight(mScroller.getCurrY());
} else {
mFooterView.setBottomMargin(mScroller.getCurrY());
}
postInvalidate();
invokeOnScrolling();
}
super.computeScroll();
}
private void resetHeaderHeight() {
int height = mHeader.getVisibleHeight();
if (height == 0) return;
// refreshing and header isn't shown fully. do nothing.
if (mPullRefreshing && height <= mHeaderHeight) return;
// default: scroll back to dismiss header.
int finalHeight = 0;
// is refreshing, just scroll back to show all the header.
if (mPullRefreshing && height > mHeaderHeight) {
finalHeight = mHeaderHeight;
}
mScrollBack = SCROLL_BACK_HEADER;
mScroller.startScroll(0, height, 0, finalHeight - height, SCROLL_DURATION);
// trigger computeScroll
invalidate();
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mLastY == -1) {
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 (isTop() && (mHeader.getVisibleHeight() > 0 || deltaY > 0)) {
// the first item is showing, header has shown or pull down.
updateHeaderHeight(deltaY / OFFSET_RADIO);
invokeOnScrolling();
} else if (isBottom() && (mFooterView.getBottomMargin() > 0 || deltaY < 0)) {
// last item, already pulled up or want to pull up.
updateFooterHeight(-deltaY / OFFSET_RADIO);
}
break;
default:
// reset
mLastY = -1;
resetHeaderOrBottom();
break;
}
return super.onTouchEvent(ev);
}
private boolean isTop() {
return getScrollY() <= 0
|| mHeader.getVisibleHeight() > mHeaderHeight
|| mContentLayout.getTop() > 0;
}