【发布时间】：2015-04-18 18:45:37
【问题描述】：
我正在实现应用程序的注册/登录部分，并尝试通过使用不同的片段进行登录和注册，在一个活动中实现它。
我有两种不同的纵向和横向布局，基本上是纵向布局的垂直布局和横向布局的水平布局，都带有徽标和包含片段的 FrameLayout（让我们只考虑登录的那个）。
片段被一个 xml 资源文件膨胀，并以这种方式以编程方式插入到活动的 onCreate() 方法中：
fragmentManager = this.getFragmentManager();
ViewGroup root = (ViewGroup) getWindow().getDecorView().findViewById(android.R.id.content);
LinearLayout linearLayout = (LinearLayout) root.getChildAt(0);
frameLayout = (FrameLayout) linearLayout.getChildAt(1);
loginFragment = (LoginFragment) fragmentManager.findFragmentByTag("loginFragment");
if (loginFragment == null) {
// If fragment wasn't saved, create new one
Log.d("DEBUG", "Fragment is null");
loginFragment = new LoginFragment();
}
else
Log.d("DEBUG", "Fragment is not null");
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(frameLayout.getId(), loginFragment, "loginFragment");
transaction.commit();
一切正常，直到我旋转屏幕，然后我得到以下信息：
java.lang.IllegalStateException：无法更改片段的容器 ID LoginFragment{19d136ec #0 id=0x7f090040 loginFragment}：是 2131296320 现在是 2131296322
我尝试在提交之后放置fragmentManager.executePendingTransactions();，但仍然是同样的问题。我真的不知道还有什么可以尝试的，希望得到一些提示。
编辑：这是布局文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageView"
android:layout_gravity="center_horizontal"
android:src="@drawable/jobsharklogo"
android:layout_weight="1" />
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/frameLayout"
android:layout_weight="1" />
</LinearLayout>
和
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageView2"
android:layout_gravity="center_vertical"
android:src="@drawable/jobsharklogo" />
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/frameLayout2"
android:layout_weight="1" />
</LinearLayout>
及LoginFragment代码：
public class LoginFragment extends Fragment implements View.OnClickListener {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private OnLoginFragmentInteractionListener mListener;
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment LoginFragment.
*/
// TODO: Rename and change types and number of parameters
public static LoginFragment newInstance(String param1, String param2) {
LoginFragment fragment = new LoginFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
public LoginFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_login, container, false);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT, 1);
params.gravity = Gravity.CENTER;
view.setLayoutParams(params);
Button loginButton = (Button) view.findViewById(R.id.loginButton);
Button signupButton = (Button) view.findViewById(R.id.signupButton);
loginButton.setOnClickListener(this);
signupButton.setOnClickListener(this);
return view;
}
public void onClick(View button) {
if (mListener != null) {
mListener.onLoginFragmentInteraction(button.getId());
}
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListener = (OnLoginFragmentInteractionListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p/>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnLoginFragmentInteractionListener {
public void onLoginFragmentInteraction(int id);
}
}
【问题讨论】：
标签： java android android-layout android-fragments screen-rotation