private void changePage(int position, SliderItem item) {
mIgnoreBackStack = true;
if (mCurrentPage >= 0) {
final SliderItem lastItem = mAdapter.getItem(mCurrentPage);
final WeakReference<Fragment> ref = lastItem.mLastFragment;
final Fragment fragment = ref == null ? null : ref.get();
if (fragment != null && fragment.isAdded() && lastItem.mSaveState) {
if (!fragment.isDetached()) {
mFragmentManager.beginTransaction().detach(fragment).commit();
mFragmentManager.executePendingTransactions();
}
lastItem.mSavedState = mFragmentManager.saveFragmentInstanceState(fragment);
}
}
mCurrentPage = position;
mAdapter.notifyDataSetInvalidated();
while (mFragmentManager.popBackStackImmediate()) {}
final Fragment fragment = Fragment.instantiate(item.mFragmentClass);
if (item.mSavedState != null) {
fragment.setInitialSavedState(item.mSavedState);
}
item.mLastFragment = new WeakReference<Fragment>(fragment);
replaceFragment(mFragmentManager, fragment);
mIgnoreBackStack = false;
}
public void add(CharSequence label, Class<? extends Fragment> fragmentClass, int[] colors) {
SliderItem item = new SliderItem();
item.setLabel(label);
item.setFragmentClass(fragmentClass);
if (colors != null && colors.length >= 2) {
final Resources res = mAddon.get().getResources();
item.setBackgroundColor(res.getColor(colors[0]));
item.setSelectionHandlerColor(res.getColor(colors[1]));
}
add(item);
}
@Override
public void onBackStackChanged() {
if (mIgnoreBackStack || mCurrentPage < 0 || mCurrentPage >= mItems.size()) {
return;
}
SliderItem item = mItems.get(mCurrentPage);
WeakReference<Fragment> ref = item.mLastFragment;
Fragment fragment = ref == null ? null : ref.get();
if (fragment == null || !item.mSaveState) {
return;
}
if (fragment.isAdded() && fragment.isDetached() && !fragment.isVisible()) {
item.mSavedState = mFragmentManager.saveFragmentInstanceState(fragment);
}
}
public void add(SliderItem item, int position) {
if (item.mSliderMenu != null) {
throw new IllegalArgumentException(
"Item already has a parent: " + item + " (" + item.mSliderMenu + ")");
}
item.mSliderMenu = this;
mItems.add(position, item);
notifyChanged();
}
public void remove(SliderItem item) {
if (mItems.remove(item)) {
item.mSliderMenu = null;
}
notifyChanged();
}