java - 选项卡内的 fragment

Question

我正在创建有两个选项卡的菜单。每个选项卡都有三个显示内容的 fragment 。我虽然这很简单，但经过试验和谷歌搜索后我发现我错了。

我设法为第一个选项卡创建了 fragment 。但是，当我切换到其他选项卡并返回时，我收到以下错误消息并且应用程序崩溃:

07-11 16:49:57.829: E/AndroidRuntime(20009): FATAL EXCEPTION: main
07-11 16:49:57.829: E/AndroidRuntime(20009): android.view.InflateException: Binary XML file line #8: Error inflating class fragment
07-11 16:49:57.829: E/AndroidRuntime(20009):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:697)
07-11 16:49:57.829: E/AndroidRuntime(20009):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:739)
07-11 16:49:57.829: E/AndroidRuntime(20009):    at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
07-11 16:49:57.829: E/AndroidRuntime(20009):    at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
07-11 16:49:57.829: E/AndroidRuntime(20009):    at com.machinedata.ui.feedback.UsersFragment.onCreateView(UsersFragment.java:16)
07-11 16:49:57.829: E/AndroidRuntime(20009):    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:828)
07-11 16:49:57.829: E/AndroidRuntime(20009):    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1032)
07-11 16:49:57.829: E/AndroidRuntime(20009):    at android.app.BackStackRecord.run(BackStackRecord.java:622)
07-11 16:49:57.829: E/AndroidRuntime(20009):    at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1382)
07-11 16:49:57.829: E/AndroidRuntime(20009):    at android.app.FragmentManagerImpl$1.run(FragmentManager.java:426)
07-11 16:49:57.829: E/AndroidRuntime(20009):    at android.os.Handler.handleCallback(Handler.java:605)
07-11 16:49:57.829: E/AndroidRuntime(20009):    at android.os.Handler.dispatchMessage(Handler.java:92)
07-11 16:49:57.829: E/AndroidRuntime(20009):    at android.os.Looper.loop(Looper.java:137)
07-11 16:49:57.829: E/AndroidRuntime(20009):    at android.app.ActivityThread.main(ActivityThread.java:4507)
07-11 16:49:57.829: E/AndroidRuntime(20009):    at java.lang.reflect.Method.invokeNative(Native Method)
07-11 16:49:57.829: E/AndroidRuntime(20009):    at java.lang.reflect.Method.invoke(Method.java:511)
07-11 16:49:57.829: E/AndroidRuntime(20009):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:978)
07-11 16:49:57.829: E/AndroidRuntime(20009):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:745)
07-11 16:49:57.829: E/AndroidRuntime(20009):    at dalvik.system.NativeStart.main(Native Method)
07-11 16:49:57.829: E/AndroidRuntime(20009): Caused by: java.lang.IllegalArgumentException: Binary XML file line #8: Duplicate id 0x7f0b0013, tag null, or parent id 0xffffffff with another fragment for com.machinedata.ui.UserListFragment
07-11 16:49:57.829: E/AndroidRuntime(20009):    at android.app.Activity.onCreateView(Activity.java:4252)
07-11 16:49:57.829: E/AndroidRuntime(20009):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:673)

现在我的选项卡本身就是 fragment ，它们动态地放置在屏幕上。然后，这些 fragment 会膨胀 xml 文件，这些文件中有静态放置的 fragment 。经过一些谷歌搜索后，我发现将 fragment 放在 fragment 中有点棘手。

getChildFragmentManager 在 API 级别 17 中工作，但我想将 API 级别保持在 14。是否有创建这种菜单结构的方法？我需要为选项卡创建单独的 Activity 吗？

这是我显示标签的 Activity :

    public class FeedbackActivity extends Activity implements UserListFragment.OnItemClickedListener
{

    private ToplistsFragment toplist;
    private UsersFragment users;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        final ActionBar actionBar = getActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
        setContentView(R.layout.feedback_screen);

        //create tabs for dashboard and graphs
        ActionBar.Tab tab1 = actionBar.newTab().setText(R.string.feedbackUsers);
        ActionBar.Tab tab2 = actionBar.newTab().setText(R.string.feedbackToplist);
        toplist = new ToplistsFragment();
        users = new UsersFragment();
        tab2.setTabListener(new MyTabsListener(toplist));
        tab1.setTabListener(new MyTabsListener(users));
        actionBar.addTab(tab1);
        actionBar.addTab(tab2);


    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
        // TODO Auto-generated method stub
        super.onCreateContextMenu(menu, v, menuInfo);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // TODO Auto-generated method stub
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) 
    {
        // TODO Auto-generated method stub
        Log.v("log","ID: " + item.getItemId() + " " + item.getTitle());
        switch (item.getItemId()) 
           {        
              case android.R.id.home: 
                  Intent intent = new Intent(this, ModeSelectActivity.class);
                  startActivity(intent);        
                 return true;    


              default:            
                 return super.onOptionsItemSelected(item);    
           }
    }


    @Override
    public void onUserItemClick(AdapterView<?> parent, View v, int position, long id, UserData user) 
    { 
        //wite your activity code here  

        Log.v("log", "name: " + user.getName());     
    }


    //tablistener
    class MyTabsListener implements ActionBar.TabListener 
    {
        public Fragment fragment;

        public MyTabsListener(Fragment fragment) 
        {
            this.fragment = fragment;
        }

        @Override
        public void onTabReselected(Tab tab, FragmentTransaction ft) 
        {

        }

        @Override
        public void onTabSelected(Tab tab, FragmentTransaction ft) 
        {
            ft.replace(R.id.feedback_fragcontainer, fragment);
        }

        @Override
        public void onTabUnselected(Tab tab, FragmentTransaction ft) 
        {
            ft.remove(fragment);
        }

    }
}

它的 xml 文件:

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

        <LinearLayout
        android:id="@+id/feedback_fragcontainer"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" />

</LinearLayout>

和标签 fragment 的 xml:

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" 
    android:baselineAligned="false">

    <fragment
        android:id="@+id/feedbackuserListFragment"
        android:layout_width="match_parent"
        android:layout_weight="1"
        android:layout_height="match_parent"
        class="com.machinedata.ui.UserListFragment" >

    </fragment>

    <fragment
        android:id="@+id/feedbackSessionListFragment"
        android:layout_width="match_parent"
        android:layout_weight="1"
        android:layout_height="match_parent"
        class="com.machinedata.ui.feedback.SessionListFragment" >
        <!-- Preview: layout=@layout/details -->
    </fragment>

    <fragment
        android:id="@+id/feedbackDetailsFragment"
        android:layout_width="match_parent"
        android:layout_weight="0.5"
        android:layout_height="match_parent"
        class="com.machinedata.ui.feedback.DetailsFragment" >
        <!-- Preview: layout=@layout/details -->
    </fragment>




</LinearLayout>

老实说，我不确定错误消息对重复 ID 意味着什么，或者是什么原因造成的。基本上我正在寻找一种解决方案来创建我描述的菜单结构或修复我当前实现的方法。

Answer 1

支持包中也提供了嵌套 fragment 功能(在 API 级别 17 上实现)。从 android.support.v4.app.Fragment 而不是 android.app.Fragment 扩展您的 fragment 。并将您的父 Activity 替换为 android.support.v4.app.FragmentActivity。