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屏幕旋转后以不同布局重画片段

[英]Redraw fragment after screen rotation with different layout

 原文  2015-04-18 18:45:37  9   1    java/ android/ android-layout/ android-fragments/ screen-rotation

问题描述

我正在实现应用程序的注册/登录部分，并且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。

对于纵向和横向模式，我有两种不同的布局，基本上是纵向模式的纵向布局和横向模式的横向布局，都带有徽标和包含片段的FrameLayout（让我们考虑一下登录模式）。

片段由xml资源文件填充，并以这种方式通过编程方式插入到活动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，直到旋转屏幕，然后我得到以下信息：

java.lang.IllegalStateException：无法更改片段LoginFragment {19d136ec＃0 id = 0x7f090040 loginFragment}的容器ID：现在是2131296320，现在2131296322

我试图放置fragmentManager.executePendingTransactions(); 提交后，但仍然是同样的问题。 我真的不知道还能尝试什么，希望能得到一些提示。

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);
}

}

1 个解决方案

解决方案1
 1 已采纳  2015-04-18 18:58:06

问题可能是您正在尝试替换通过XML添加的片段。

请参阅： 替换Fragment时的IllegalStateException以进行讨论。

编辑2：

我也使用风景模式，并且能够旋转它并更改布局。 好的，我实现了您的代码（可以从您的代码中得出）。 我只使用findViewBy()更改了元素定位的方式。

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" />

在任何旋转模式下单击按钮，我得到： 

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" />

和纵向模式（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" />

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