平板电脑屏幕方向更改 - 未找到片段ID的视图

Question

我在SO上查看了与我的问题有关的问题，但无法弄清问题是什么。如果这是转贴，请耐心等待。

以下是我要找的内容：

手机的布局更改工作正常，因为它涉及片段内的相同视图。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);

}

MainPctivity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;
}

logcat的：

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，我没有处于纵向模式。我该如何解决？如果您还需要代码，请告诉我。很高兴发帖..

Answer 1

我能想到你得到这个错误的唯一方法是使用旧的布局。那可能是因为super.onCreate(savedInstanceState);

而是尝试忽略已保存的状态：

super.onCreate(null);

修改

对@matiash评论的回复：

由于OP没有提供重新创建问题的代码，因此很难测试其他（如果有的话）解决方案。

但我同意重置savedInstanceState有点过分。因此，我认为OP应该亲自尝试并确保尽可能多地保存视图。

首先想到的是防止有问题的视图被保存：

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

Answer 2

FragmentManager会在旋转时尝试重新创建所有片段，但在纵向模式下，您不再具有DetailFragment布局，因此您应该删除片段以防止它被连接。

编辑：检测方向变化的最简洁方法可能是使用OrientationEventListener。您可以参考this post和this作为示例。您应该删除应该覆盖的方法onOrientationChanged (int orientation)中的片段。

Answer 3

更改代码，

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

通过

if(getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE){
    //Do some stuff
mTwoPane = true;
} else{
 mTwoPane = false;
}

希望它会帮助你