退出最前沿的Fragment
@Override
public void onBackPressed() {
SparseArray<FragmentManager> managers = new SparseArray<>();
traverseManagers(getSupportFragmentManager(), managers, 0);
if (managers.size() > 0) {
managers.valueAt(managers.size() - 1).popBackStackImmediate();
} else {
super.onBackPressed();
}
}
private void traverseManagers(FragmentManager manager, SparseArray<FragmentManager> managers, int intent) {
if (manager.getBackStackEntryCount() > 0) {
managers.put(intent, manager);
}
if (manager.getFragments() == null) {
return;
}
for (Fragment fragment : manager.getFragments()) {
if (fragment != null) traverseManagers(fragment.getChildFragmentManager(), managers, intent + 1);
}
}
