android - 平板电脑屏幕方向更改 - 未找到 fragment ID 的 View

Question

我已经在 SO 上查看了与我的问题相关的问题，但无法弄清楚问题是什么。如果这是转发，请多多包涵。

这是我要找的:

手机的布局更改工作正常，因为它涉及 fragment 内的相同 View 。问题是当我尝试在平板电脑中获得以下布局时。

纵向模式下的activity_main.xml:

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >

        <include
            android:id="@+id/toolbar"
            layout="@layout/toolbar_with_spinner" />

        <FrameLayout
            android:id="@+id/fragment_container"
            android:layout_width="match_parent"
            android:layout_height="match_parent" >
        </FrameLayout>
    </LinearLayout>

    <ListView
        android:id="@+id/listview_drawer"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:background="@color/white"
        android:choiceMode="singleChoice"
        android:divider="@null"
        android:dividerHeight="0dp" />

</android.support.v4.widget.DrawerLayout>

横向模式下的activity_main.xml:

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >

        <include
            android:id="@+id/toolbar"
            layout="@layout/toolbar_with_spinner" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:baselineAligned="false"
            android:orientation="horizontal" >

            <FrameLayout
                android:id="@+id/fragment_container"
                android:layout_width="0dip"
                android:layout_height="match_parent"
                android:layout_weight="0.40" />

            <FrameLayout
                android:id="@+id/detail_fragment_container"
                android:layout_width="0dip"
                android:layout_height="match_parent"
                android:layout_weight="0.60" />
        </LinearLayout>
    </LinearLayout>

    <ListView
        android:id="@+id/listview_drawer"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:background="@color/white"
        android:choiceMode="singleChoice"
        android:divider="@null"
        android:dividerHeight="0dp" />

</android.support.v4.widget.DrawerLayout>

fragment _main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/swipeRefreshLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:orientation="vertical"
    android:padding="4dp" >

    <GridView
        android:id="@+id/gridview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/white"
        android:horizontalSpacing="0dp"
        android:numColumns="3"
        android:stretchMode="columnWidth"
        android:verticalSpacing="0dp" >
    </GridView>

    <WebView
        android:id="@+id/webview_fragment_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="gone" />

</android.support.v4.widget.SwipeRefreshLayout>

MainActivity - onCreate():

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    if (Const.DEBUGGING_INT)
        Log.d(Const.DEBUG, "Activity - onCreate");

    prefs = PreferenceManager.getDefaultSharedPreferences(this);

    if (Const.DEBUGGING)
        Log.d(Const.DEBUG, "Index = " + index);

    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    toolbar = (Toolbar) findViewById(R.id.toolbar);
    spinner = (Spinner) toolbar.findViewById(R.id.spinner);
    mDrawerList = (ListView) findViewById(R.id.listview_drawer);

    setUpHeaderAndFooter();

    setSupportActionBar(toolbar);
    getSupportActionBar().setHomeButtonEnabled(true);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    getSupportActionBar().setTitle("");

    setUpToolBar();
    setUpSpinner();
    setUpNavigationDrawer();

    if ((findViewById(R.id.fragment_container) != null)
            && (findViewById(R.id.detail_fragment_container) != null)) {
        mTwoPane = true;
    } else {
        mTwoPane = false;
    }

    setFragment(prefs.getInt(Const.Prefs.MAININDEX, 0), 0);

}

MainActivity 中的 setFragment 方法:

private void setFragment(int mainIndex, int subIndex) {

    if (Const.DEBUGGING_INT) {
        Log.d(Const.DEBUG, "Activity - setFragment");
        Log.d(Const.DEBUG, "Position = " + mainIndex);
        Log.d(Const.DEBUG, "TwoPane? " + mTwoPane);
    }

    incrementClickCount(mainIndex);

    mMainFragment = new MainFragment();
    getSupportFragmentManager().beginTransaction()
            .replace(R.id.fragment_container, mMainFragment).commit();

    Bundle bundle = new Bundle();
    bundle.putInt(Const.BundleParameters.MAININDEX, mainIndex);
    bundle.putInt(Const.BundleParameters.SUBINDEX, subIndex);
    bundle.putBoolean(Const.BundleParameters.TWOPANE, mTwoPane);
    bundle.putInt(Const.BundleParameters.CURRENTPOSITION, 0);
    mMainFragment.setParameters(bundle);

    mDrawerList.setItemChecked(mainIndex, true);
    mDrawerLayout.closeDrawer(mDrawerList);

    if (mTwoPane) {

        mDetailFragment = new DetailFragment();
        getSupportFragmentManager().beginTransaction()
                .replace(R.id.detail_fragment_container, mDetailFragment)
                .commit();

        if (Const.DEBUGGING)
            Log.d(Const.DEBUG,
                    "URL = " + prefs.getString(Const.Prefs.CURRENT_URL, ""));

        Bundle b = new Bundle();
        b.putString("url", prefs.getString(Const.Prefs.CURRENT_URL, ""));
        mDetailFragment.setParameters(b);
    }

}

MainFragment - onCreateView():

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    Log.d(Const.DEBUG, "Fragment - onCreateView");

    View view = inflater.inflate(R.layout.fragment_main, container, false);

    mSwipeRefreshLayout = (SwipeRefreshLayout) view
            .findViewById(R.id.swipeRefreshLayout);
    mSwipeRefreshLayout.setOnRefreshListener(this);
    mSwipeRefreshLayout.setColorSchemeResources(R.color.blue,
            R.color.green, R.color.pink, R.color.yellow);

    // if (!mSwipeRefreshLayout.isRefreshing())
    mSwipeRefreshLayout.setRefreshing(true);

    prefs = PreferenceManager.getDefaultSharedPreferences(activity);

    mDbAdapter = DatabaseHelper.get(getActivity().getApplicationContext())
            .getDbAdapter();

    gridview = (GridView) view.findViewById(R.id.gridview);
    webview = (WebView) view.findViewById(R.id.webview_fragment_main);
    webview.setWebViewClient(new MyWebViewClient());
    webview.setWebChromeClient(new WebChromeClient() {
        @Override
        public boolean onJsAlert(WebView view, String url, String message,
                JsResult result) {
            return super.onJsAlert(view, url, message, result);
        }
    });

    WebSettings settings = webview.getSettings();
    settings.setJavaScriptEnabled(true);
    settings.setCacheMode(WebSettings.LOAD_NO_CACHE);
    webview.setVerticalScrollBarEnabled(false);
    webview.setHorizontalScrollBarEnabled(false);

    setTableDetails();

    isTableEmpty = mDbAdapter.isTableEmpty(mTableName);
    if (isTableEmpty) {
        getDataFromServer(true);
    } else {
        checkRefreshTimeAndGetData();
    }

    return view;
}

DetailFragment - onCreateView():

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    if (Const.DEBUGGING) {
        Log.d(Const.DEBUG, "***** DetailFragment - onCreateView *****");
        Log.d(Const.DEBUG, "URL = " + url);
    }

    View view = inflater
            .inflate(R.layout.fragment_detail, container, false);

    prefs = PreferenceManager.getDefaultSharedPreferences(activity);
    pd = (ProgressBar) view.findViewById(R.id.progressBar);

    webview = (WebView) view.findViewById(R.id.webview_fragment_detail);
    webview.setWebViewClient(new MyWebViewClient());
    webview.setWebChromeClient(new WebChromeClient() {
        @Override
        public boolean onJsAlert(WebView view, String url, String message,
                JsResult result) {
            return super.onJsAlert(view, url, message, result);
        }
    });

    pd.setVisibility(View.VISIBLE);
    webview.setVisibility(View.GONE);

    WebSettings settings = webview.getSettings();
    settings.setJavaScriptEnabled(true);
    webview.setVerticalScrollBarEnabled(false);
    webview.setHorizontalScrollBarEnabled(false);
    webview.loadUrl(url);
    // webview.loadDataWithBaseURL(url, null, "text/html", "utf-8", null);

    return view;
}

日志:

11-16 23:15:05.234: E/FragmentManager(26609): No view found for id 0x7f0a0052 (com.xx.xxx:id/detail_fragment_container) for fragment DetailFragment{42476ab8 #1 id=0x7f0a0052}

我知道它正在寻找 detail_fragment_container，我在纵向模式下没有。我该如何解决？让我知道您是否也需要代码。很乐意发布..

Answer 1

我认为您遇到该错误的唯一方法是使用您的旧布局。那可能是因为 super.onCreate(savedInstanceState);

改为尝试忽略保存的状态:

super.onCreate(null);

编辑:

对@matiash 评论的回应:

由于 OP 没有提供代码来重现问题，因此很难测试其他(如果有的话)解决方案。

不过，我同意重置 savedInstanceState 有点矫枉过正。因此，我认为 OP 应该自己尝试并确保他保存尽可能多的 View 。

首先想到的是阻止有问题的 View 被保存:

<FrameLayout
    android:id="@+id/detail_fragment_container"
    android:layout_width="0dip"
    android:layout_height="match_parent"
    android:layout_weight="0.60"
    android:saveEnabled="false"/>