同时关闭多个DialogFragment

FragmentManager fragmentManager = getSupportFragmentManager();
for (Fragment fragment : fragmentManager.getFragments()) {
    if (fragment instanceof DialogFragment) {
        ((DialogFragment) fragment).dismiss();
    }
}

FragmentManager fragmentManager = getSupportFragmentManager();
DialogFragment fragment = (DialogFragment) fragmentManager.findFragmentByTag("unique_tag");
if (fragment != null) {
    fragment.dismiss();
}

public class DialogManager {
    private List<DialogFragment> dialogs = new ArrayList<>();

    public void addDialog(DialogFragment dialog) {
        dialogs.add(dialog);
    }

    public void dismissAll() {
        for (DialogFragment dialog : dialogs) {
            dialog.dismiss();
        }
        dialogs.clear();
    }
}

DialogManager dialogManager = new DialogManager();
DialogFragment dialog1 = new MyDialogFragment();
DialogFragment dialog2 = new AnotherDialogFragment();

dialogManager.addDialog(dialog1);
dialogManager.addDialog(dialog2);

// 关闭所有对话框
dialogManager.dismissAll();

DialogFragment newFragment = MyDialogFragment.newInstance();
newFragment.show(getSupportFragmentManager(), "unique_tag");

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    // 保存必要的状态信息
}