public void onAdapterDataChanged() {
final Adapter adapter = mRecyclerView.getAdapter();
if (mChoiceMode == ChoiceMode.NONE || adapter == null || !adapter.hasStableIds()) {
return;
}
final int itemCount = adapter.getItemCount();
// Clear out the positional check states, we'll rebuild it below from IDs.
mCheckedStates.clear();
for (int checkedIndex = 0; checkedIndex < mCheckedIdStates.size(); checkedIndex++) {
final long currentId = mCheckedIdStates.keyAt(checkedIndex);
final int currentPosition = mCheckedIdStates.valueAt(checkedIndex);
final long newPositionId = adapter.getItemId(currentPosition);
if (currentId != newPositionId) {
// Look around to see if the ID is nearby. If not, uncheck it.
final int start = Math.max(0, currentPosition - CHECK_POSITION_SEARCH_DISTANCE);
final int end = Math.min(currentPosition + CHECK_POSITION_SEARCH_DISTANCE, itemCount);
boolean found = false;
for (int searchPos = start; searchPos < end; searchPos++) {
final long searchId = adapter.getItemId(searchPos);
if (currentId == searchId) {
found = true;
mCheckedStates.put(searchPos, true);
mCheckedIdStates.setValueAt(checkedIndex, searchPos);
break;
}
}
if (!found) {
mCheckedIdStates.delete(currentId);
mCheckedCount--;
checkedIndex--;
}
} else {
mCheckedStates.put(currentPosition, true);
}
}
}
@Override
public boolean handleKeyboardShortcutRepeat(
@NonNull final KeyboardShortcutsHandler handler,
final int keyCode,
final int repeatCount,
@NonNull final KeyEvent event,
int metaState) {
final String action = handler.getKeyAction(CONTEXT_TAG_NAVIGATION, keyCode, event, metaState);
if (action == null) return false;
final int direction;
switch (action) {
case ACTION_NAVIGATION_PREVIOUS:
{
direction = -1;
break;
}
case ACTION_NAVIGATION_NEXT:
{
direction = 1;
break;
}
case ACTION_NAVIGATION_PAGE_DOWN:
{
RecyclerViewUtils.pageScroll(view, manager, 1);
return true;
}
case ACTION_NAVIGATION_PAGE_UP:
{
RecyclerViewUtils.pageScroll(view, manager, -1);
return true;
}
default:
{
return false;
}
}
final View focusedChild =
RecyclerViewUtils.findRecyclerViewChild(view, manager.getFocusedChild());
final int position;
final int firstVisibleItemPosition = manager.findFirstVisibleItemPosition();
final int lastVisibleItemPosition = manager.findLastVisibleItemPosition();
final int itemCount = adapter.getItemCount();
final boolean backupOutsideRange =
positionBackup > lastVisibleItemPosition || positionBackup < firstVisibleItemPosition;
if (focusedChild != null) {
position = view.getChildLayoutPosition(focusedChild);
} else if (firstVisibleItemPosition == 0) {
position = -1;
} else if (lastVisibleItemPosition == itemCount - 1) {
position = itemCount;
} else if (direction > 0 && backupOutsideRange) {
position = firstVisibleItemPosition;
} else if (direction < 0 && backupOutsideRange) {
position = lastVisibleItemPosition;
} else {
position = positionBackup;
}
positionBackup = position;
RecyclerViewUtils.focusNavigate(view, manager, position, direction);
return true;
}