/**
* Refreshes the content of the parent list view while maintaining the current vertical position
* in the list view.
*/
private void refreshListView(ViewGroup parent, Group updatedGroup) {
// Get position of first and last visible list items
AbsListView parentListView = (AbsListView) parent.findViewById(android.R.id.list);
int firstVisible = parentListView.getFirstVisiblePosition();
int lastVisible = parentListView.getLastVisiblePosition();
// Populate list view
mItems.clear();
List<Group> groups = Group.getAllSortedByDisplayOrder();
for (Group group : groups) {
mItems.add(group.name);
}
notifyDataSetChanged();
// Handle case where item is at visible top and moved up.
if (firstVisible >= updatedGroup.getDisplayOrder()) {
parentListView.setSelection(updatedGroup.getDisplayOrder() - 1);
// Handle case where item is at visible bottom and moved down.
} else if (lastVisible < updatedGroup.getDisplayOrder()) {
parentListView.setSelection(firstVisible + 1);
// Handle move cases in the middle of viewable listview.
} else {
parentListView.setSelection(firstVisible);
}
}
/** 重新获取嵌套的内容视图 */
private void regetNestedContentView() {
int currentItem = mDirectViewPager.getCurrentItem();
PagerAdapter adapter = mDirectViewPager.getAdapter();
if (adapter instanceof FragmentPagerAdapter || adapter instanceof FragmentStatePagerAdapter) {
Fragment item = (Fragment) adapter.instantiateItem(mDirectViewPager, currentItem);
mNestedContentView = item.getView();
// 清空之前的
mNestedNormalView = null;
mNestedAbsListView = null;
mNestedRecyclerView = null;
mNestedScrollView = null;
mNestedWebView = null;
if (mNestedContentView instanceof AbsListView) {
mNestedAbsListView = (AbsListView) mNestedContentView;
mNestedAbsListView.setOnScrollListener(mLvOnScrollListener);
if (!isHeaderViewCompleteInvisible()) {
mNestedAbsListView.setSelection(0);
}
} else if (mNestedContentView instanceof RecyclerView) {
mNestedRecyclerView = (RecyclerView) mNestedContentView;
mNestedRecyclerView.removeOnScrollListener(mRvOnScrollListener);
mNestedRecyclerView.addOnScrollListener(mRvOnScrollListener);
if (!isHeaderViewCompleteInvisible()) {
mNestedRecyclerView.scrollToPosition(0);
}
} else if (mNestedContentView instanceof ScrollView) {
mNestedScrollView = (ScrollView) mNestedContentView;
if (!isHeaderViewCompleteInvisible()) {
mNestedScrollView.scrollTo(mNestedScrollView.getScrollX(), 0);
}
} else if (mNestedContentView instanceof WebView) {
mNestedWebView = (WebView) mNestedContentView;
if (!isHeaderViewCompleteInvisible()) {
mNestedWebView.scrollTo(mNestedWebView.getScrollX(), 0);
}
} else {
mNestedNormalView = mNestedContentView;
}
} else {
throw new IllegalStateException(
BGAStickyNavLayout.class.getSimpleName()
+ "的第三个子控件为ViewPager时，其adapter必须是FragmentPagerAdapter或者FragmentStatePagerAdapter");
}
}
/**
* Emulates a directional pad event based on the given flick direction.
*
* @param direction A flick direction constant.
*/
private void changeFocus(int direction) {
int keyCode = KeyEvent.KEYCODE_UNKNOWN;
switch (direction) {
case FlickGestureListener.FLICK_UP:
keyCode = KeyEvent.KEYCODE_DPAD_UP;
break;
case FlickGestureListener.FLICK_RIGHT:
keyCode = KeyEvent.KEYCODE_DPAD_RIGHT;
break;
case FlickGestureListener.FLICK_DOWN:
keyCode = KeyEvent.KEYCODE_DPAD_DOWN;
break;
case FlickGestureListener.FLICK_LEFT:
keyCode = KeyEvent.KEYCODE_DPAD_LEFT;
break;
default:
// Invalid flick constant.
return;
}
if (keyCode != KeyEvent.KEYCODE_UNKNOWN) {
final int keyCodeFinal = keyCode;
// Exit from touch mode as gracefully as possible.
if (mSelectedView != null) {
ViewParent parent = mSelectedView.getParent();
mSelectedView.requestFocusFromTouch();
// If the selected view belongs to a list, make sure it's
// selected within the list (since it's not focusable).
// TODO(alanv): Check whether the prior call was successful?
if (parent instanceof AbsListView) {
AbsListView listParent = (AbsListView) parent;
int position = listParent.getPositionForView(mSelectedView);
listParent.setSelection(position);
}
} else {
requestFocusFromTouch();
}
// We have to send the key event on a separate thread, then return
// to the main thread to synchronize the selected view with focus.
new Thread() {
@Override
public void run() {
mInstrumentation.sendKeyDownUpSync(keyCodeFinal);
mHandler.post(
new Runnable() {
@Override
public void run() {
View newFocusedView = findFocus();
setSelectedView(newFocusedView, false);
}
});
}
}.start();
}
}