我正在实现应用程序的注册/登录部分,我试图通过使用不同的片段进行登录和注册来在一个活动中实现它。
我有两种不同的纵向和横向模式布局,基本上是纵向布局和横向布局,包括徽标和包含片段的FrameLayout(让我们考虑一下登录)。
片段由xml资源文件膨胀,并以这种方式以编程方式插入到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,然后我得到以下内容:
java.lang.IllegalStateException:无法更改片段的容器ID LoginFragment {19d136ec#0 id = 0x7f090040 loginFragment}:是2131296320 现在2131296322
我尝试在提交后放置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>
和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);
}
}
答案 0 :(得分:1)
问题可能在于您尝试替换通过XML添加的片段。
请参阅:IllegalStateException when replacing a Fragment进行讨论。
编辑2:
我也使用横向模式,并且能够旋转它并更改布局。
好的,我实现了你的代码(我可以从你的代码中找到)。我只使用findViewBy()
更改了我找到元素的方式。
在活动中:
public class LoginActivity extends Activity implements LoginFragment.OnLoginFragmentInteractionListener {
private FragmentManager fragmentManager;
private FrameLayout frameLayout;
private LoginFragment loginFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
fragmentManager = this.getFragmentManager();
ViewGroup root = (ViewGroup) getWindow().getDecorView().findViewById(android.R.id.content);
frameLayout = (FrameLayout) root.findViewById(R.id.frameLayout);
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().newInstance("param1", "param2");
}
else
Log.d("DEBUG", "Fragment is not null");
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(frameLayout.getId(), loginFragment, "loginFragment");
transaction.commit();
}
@Override
public void onLoginFragmentInteraction(int id) {
Log.e("DEBuG", "id: "+id);
}
}
其中main.xml
是:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:id="@+id/linear"
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"
android:background="#f0498a">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/frameLayout"
android:layout_weight="1" />
在任何一种旋转模式中点击按钮,我得到了:
E/DEBuG﹕ id: 2131296322
E/DEBuG﹕ id: 2131296321
我用于横向模式的xml(放入layout-land
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="horizontal"
android:id="@+id/linear"
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"
android:background="@color/material_blue_grey_900">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/frameLayout"
android:layout_weight="1" />
<Button
android:id="@+id/loginButton"
android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="login"/>
<Button
android:id="@+id/signupButton"
android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="sing in"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageView2"
android:layout_gravity="center_vertical"
android:src="@drawable/jobsharklogo" />
和肖像模式(仅在layout
文件夹中)
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:id="@+id/linear"
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"
android:background="#f0498a">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/frameLayout"
android:layout_weight="1" />
<Button
android:id="@+id/loginButton"
android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="login"/>
<Button
android:id="@+id/signupButton"
android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="sing in"/>
<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" />