/**
* Copy From AbsListView (API Level >= 19)
*
* @param absListView AbsListView
* @param direction Negative to check scrolling up, positive to check scrolling down.
* @return true if the list can be scrolled in the specified direction, false otherwise
*/
private boolean absListViewCanScrollList(AbsListView absListView, int direction) {
final int childCount = absListView.getChildCount();
if (childCount == 0) {
return false;
}
final int firstPosition = absListView.getFirstVisiblePosition();
if (direction > 0) { // can scroll down
final int lastBottom = absListView.getChildAt(childCount - 1).getBottom();
final int lastPosition = firstPosition + childCount;
return lastPosition < absListView.getCount()
|| lastBottom > absListView.getHeight() - absListView.getPaddingTop();
} else { // can scroll up
final int firstTop = absListView.getChildAt(0).getTop();
return firstPosition > 0 || firstTop < absListView.getPaddingTop();
}
}
@Override
public boolean isScrollableChildUnscrolled() {
final AbsListView listView = getCurrentListView();
return listView != null
&& (listView.getChildCount() == 0
|| listView.getChildAt(0).getTop() == listView.getPaddingTop());
}
public boolean canChildScrollUp() {
if (Build.VERSION.SDK_INT < 14) {
if ((this.mTarget instanceof AbsListView)) {
AbsListView absListView = (AbsListView) this.mTarget;
return (absListView.getChildCount() > 0)
&& ((absListView.getFirstVisiblePosition() > 0)
|| (absListView.getChildAt(0).getTop() < absListView.getPaddingTop()));
}
return (ViewCompat.canScrollVertically(this.mTarget, -1)) || (this.mTarget.getScrollY() > 0);
}
return ViewCompat.canScrollVertically(this.mTarget, -1);
}
/**
* @return Whether it is possible for the child view of this layout to scroll up. Override this if
* the child view is a custom view.
*/
public boolean canChildScrollUp() {
if (android.os.Build.VERSION.SDK_INT < 14) {
if (mTarget instanceof AbsListView) {
final AbsListView absListView = (AbsListView) mTarget;
return absListView.getChildCount() > 0
&& (absListView.getFirstVisiblePosition() > 0
|| absListView.getChildAt(0).getTop() < absListView.getPaddingTop());
} else {
return mTarget.getScrollY() > 0;
}
} else {
return ViewCompat.canScrollVertically(mTarget, -1);
}
}
public static boolean canChildScrollUp(View view) {
if (android.os.Build.VERSION.SDK_INT < 14) {
if (view instanceof AbsListView) {
final AbsListView absListView = (AbsListView) view;
return absListView.getChildCount() > 0
&& (absListView.getFirstVisiblePosition() > 0
|| absListView.getChildAt(0).getTop() < absListView.getPaddingTop());
} else {
return view.getScrollY() > 0;
}
} else {
return view.canScrollVertically(-1);
}
}
/**
* get AbsListView height according to every children
*
* @param view
* @return
*/
public static int getAbsListViewHeightBasedOnChildren(AbsListView view) {
ListAdapter adapter;
if (view == null || (adapter = view.getAdapter()) == null) {
return 0;
}
int height = 0;
for (int i = 0; i < adapter.getCount(); i++) {
View item = adapter.getView(i, null, view);
if (item instanceof ViewGroup) {
item.setLayoutParams(
new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
}
item.measure(0, 0);
height += item.getMeasuredHeight();
}
height += view.getPaddingTop() + view.getPaddingBottom();
return height;
}
public static boolean canViewScrollUp(View view) {
if (view == null) {
return false;
}
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
if (view instanceof AbsListView) {
final AbsListView absListView = (AbsListView) view;
if (absListView.getChildCount() == 0) {
return false;
}
return absListView.getFirstVisiblePosition() > 0
|| absListView.getChildAt(0).getTop() < absListView.getPaddingTop();
} else {
return view.getScrollY() > 0;
}
} else {
return ViewCompat.canScrollVertically(view, -1);
}
}
