Android的错误:没有标签的空标签知 [英] Android Error : No Tab known for Null Tag

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问题描述

我需要在顶部的固定区域(约20%),然后3下方标签。 XML是

mylist.xml

 <?XML版本=1.0编码=UTF-8&GT?;
< LinearLayout中的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
    机器人:layout_width =match_parent
    机器人:layout_height =match_parent
    机器人:方向=垂直>
    <的LinearLayout
        机器人:layout_width =match_parent
        机器人:layout_height =0dp
        机器人:layout_weight =0.2
        机器人:方向=垂直>        <查看
            机器人:layout_width =match_parent
            机器人:layout_height =0dp
            机器人:layout_weight =0.05
            机器人:知名度=隐形/>        <的TextView
            机器人:ID =@ + ID / LIST_NAME
            机器人:layout_width =match_parent
            机器人:layout_height =0dp
            机器人:layout_weight =0.3
            机器人:文字颜色=@彩色/ loclistitem_text
            机器人:文字样式=大胆/>        <的TextView
            机器人:ID =@ + ID / list_spec
            机器人:layout_width =match_parent
            机器人:layout_height =0dp
            机器人:layout_weight =0.3/>        <查看
            机器人:layout_width =match_parent
            机器人:layout_height =0dp
            机器人:layout_weight =0.1
            机器人:知名度=隐形/>        <的TextView
            机器人:ID =@ + ID / list_user
            机器人:layout_width =match_parent
            机器人:layout_height =0dp
            机器人:layout_weight =0.2/>
    < / LinearLayout中>    <的LinearLayout
        机器人:layout_width =match_parent
        机器人:layout_height =0dp
        机器人:layout_weight =0.8
        机器人:方向=横向>        <查看
            机器人:layout_width =0dp
            机器人:layout_height =match_parent
            机器人:layout_weight =0.05
            机器人:知名度=隐形/>        <的FrameLayout
            机器人:ID =@ + ID / list_realtabcontent
            机器人:layout_width =0dp
            机器人:layout_height =match_parent
            机器人:layout_weight =0.95/>        <查看
            机器人:layout_width =0dp
            机器人:layout_height =match_parent
            机器人:layout_weight =0.05
            机器人:知名度=隐形/>
    < / LinearLayout中>    < android.support.v4.app.FragmentTabHost
        机器人:ID =@机器人:ID / tabhost
        机器人:layout_width =match_parent
        机器人:layout_height =WRAP_CONTENT
        机器人:背景=#CCF8FB>        <的FrameLayout
            机器人:ID =@机器人:ID / tabcontent
            机器人:layout_width =0dip
            机器人:layout_height =0dip
            机器人:layout_weight =0/>
    < /android.support.v4.app.FragmentTabHost>< / LinearLayout中>

MyListFragment.java

 公共类MyListFragment扩展片段{        私人FragmentTabHost mTab​​Host;        @覆盖
        公共查看onCreateView(LayoutInflater充气器,容器的ViewGroup,
                捆绑savedInstanceState){
            // TODO自动生成方法存根            查看rootView = inflater.inflate(R.layout.mylist,集装箱,
                    假);
            TextView的名字=(TextView中)rootView.findViewById(R.id.list_name);
            TextView的规格=(TextView中)rootView.findViewById(R.id.loc_spec);
            TextView的用户=(TextView中)rootView.findViewById(R.id.list_user);
            name.setText(AppSession.getInstance()的getData()的getName());
            mTabHost =新FragmentTabHost(getActivity());            mTabHost.setup(getActivity(),getChildFragmentManager(),
                    R.id.list_realtabcontent);            捆绑ARG1 =新包();
            arg1.putInt(TAB1,1);            mTabHost.addTab(
                    mTabHost.newTabSpec(TAB1)。setIndicator(TAB1
                            getResources()。getDrawable(R.drawable.tab_left))
                    Tab1.class,ARG1);            捆绑ARG2 =新包();
            arg2.putInt(TAB2,2);
            mTabHost.addTab(
                    mTabHost.newTabSpec(TAB2)。setIndicator(TAB2,
                            getResources()。getDrawable(R.drawable.tab_middle))
                    Tab2.class,ARG2);            捆绑ARG3 =新包();
            arg3.putInt(TAB3,3);
            mTabHost.addTab(
                    mTabHost.newTabSpec(TAB3)。setIndicator(TAB3,
                            getResources()。getDrawable(R.drawable.tab_rigth))
                    Tab3Fragment.class,ARG2);            返回rootView;        }        @覆盖
        公共无效onDetach(){
            super.onDetach();            尝试{
                现场childFragmentManager = Fragment.class
                        .getDeclaredField(mChildFragmentManager);
                childFragmentManager.setAccessible(真);
                childFragmentManager.set(这一点,空);            }赶上(NoSuchFieldException E){
                抛出新的RuntimeException(E);
            }赶上(IllegalAccessException E){
                抛出新的RuntimeException(E);
            }
        }    }

我得到没有标签闻名标签空在android.support.v4.app.FragmentTabHost.doTabChanged。

如果我更改错误解决返回rootView 返回mTabHost 。但随后在顶部的固定区域没有显示。它仅在屏幕顶部显示3个标签。
我试着用活动来设置这个特殊的屏幕和它工作得很好(固定区域顶部和标签正确显示),但我需要它使用片段作为我公司采用抽屉式导航所以这是片段。请指点。

修改的XML

 的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
    机器人:ID =@机器人:ID / tabhost
    机器人:layout_width =match_parent
    机器人:layout_height =match_parent
    机器人:背景=#CCF8FB>    <的LinearLayout
        机器人:layout_width =match_parent
        机器人:layout_height =0dp
        机器人:方向=垂直>        <的TextView
            机器人:ID =@ + ID / loc_playlist_locname
            机器人:layout_width =match_parent
            机器人:layout_height =0dp
            机器人:layout_weight =0.2/>        <的FrameLayout
            机器人:ID =@ + ID / playlist_realtabcontent
            机器人:layout_width =match_parent
            机器人:layout_height =0dp
            机器人:layout_weight =0.1/>        <的FrameLayout
            机器人:ID =@机器人:ID / tabcontent
            机器人:layout_width =0dip
            机器人:layout_height =0dip
            机器人:layout_weight =0/>
    < / LinearLayout中>< /android.support.v4.app.FragmentTabHost>


解决方案

我对您的code一些变化:
- 在实施中,使用在布局中指定的FragmentTabHost
- 使用的FrameLayout FragmentTabHost元素中指定在TabHost设置方法的布局。它似乎工作,检查出code如下:

XML文件:

 <?XML版本=1.0编码=UTF-8&GT?;
    < LinearLayout中的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
    机器人:layout_width =match_parent
    机器人:layout_height =match_parent
    机器人:方向=垂直>
    <的LinearLayout
    机器人:layout_width =match_parent
    机器人:layout_height =0dp
    机器人:layout_weight =0.2
    机器人:方向=垂直>
    <查看
    机器人:layout_width =match_parent
    机器人:layout_height =0dp
    机器人:layout_weight =0.05
    机器人:知名度=隐形/>
    <的TextView
    机器人:ID =@ + ID / LIST_NAME
    机器人:layout_width =match_parent
    机器人:layout_height =0dp
    机器人:layout_weight =0.3
    机器人:文字样式=大胆/>
    <的TextView
    机器人:ID =@ + ID / list_spec
    机器人:layout_width =match_parent
    机器人:layout_height =0dp
    机器人:layout_weight =0.3/>
   <查看
    机器人:layout_width =match_parent
    机器人:layout_height =0dp
    机器人:layout_weight =0.1
    机器人:知名度=隐形/>
    <的TextView
    机器人:ID =@ + ID / list_user
    机器人:layout_width =match_parent
    机器人:layout_height =0dp
    机器人:layout_weight =0.2/>
    < / LinearLayout中>
    <的LinearLayout
    机器人:layout_width =match_parent
    机器人:layout_height =0dp
    机器人:layout_weight =0.8
    机器人:方向=横向>
    <查看
    机器人:layout_width =0dp
    机器人:layout_height =match_parent
    机器人:layout_weight =0.05
    机器人:知名度=隐形/>
   <查看
   机器人:layout_width =0dp
   机器人:layout_height =match_parent
   机器人:layout_weight =0.05
   机器人:知名度=隐形/>
   < / LinearLayout中>
   < android.support.v4.app.FragmentTabHost
   机器人:ID =@ + ID / tabhost
   机器人:layout_width =match_parent
   机器人:layout_height =WRAP_CONTENT
   机器人:背景=#CCF8FB>
   <的FrameLayout
   机器人:ID =@ + ID / list_realtabcontent
   机器人:layout_width =0dp
   机器人:layout_height =match_parent
   机器人:layout_weight =0.95/>
   < /android.support.v4.app.FragmentTabHost>
   < / LinearLayout中>

片段类:

 公共类MyListFragment扩展片段{        私人FragmentTabHost mTab​​Host;        @覆盖
        公共查看onCreateView(LayoutInflater充气器,容器的ViewGroup,
                捆绑savedInstanceState){
            // TODO自动生成方法存根            查看rootView = inflater.inflate(R.layout.activity_main,集装箱,
                    假);
            TextView的名字=(TextView中)rootView.findViewById(R.id.list_name);
            TextView的规格=(TextView中)rootView.findViewById(R.id.list_spec);
            TextView的用户=(TextView中)rootView.findViewById(R.id.list_user);
            mTabHost =(FragmentTabHost)rootView.findViewById(R.id.tabhost);            mTabHost.setup(getActivity(),getChildFragmentManager(),
                    R.id.list_realtabcontent);            捆绑ARG1 =新包();
            arg1.putInt(TAB1,1);            mTabHost.addTab(
                   mTabHost.newTabSpec(TAB1)。setIndicator(TAB1
                            getResources()。getDrawable(R.drawable.tab_chat_unselected))
                      TabFragment.class,ARG1);            捆绑ARG2 =新包();
            arg2.putInt(TAB2,2);
            mTabHost.addTab(
                    mTabHost.newTabSpec(TAB2)。setIndicator(TAB2,
                            getResources()。getDrawable(R.drawable.tab_chat_unselected))
                    TabFragment.class,ARG2);            捆绑ARG3 =新包();
            arg3.putInt(TAB3,3);
            mTabHost.addTab(
                    mTabHost.newTabSpec(TAB3)。setIndicator(TAB3,
                            getResources()。getDrawable(R.drawable.tab_chat_unselected))
                    TabFragment.class,ARG3);            返回rootView;        }

I need a fixed area (around 20%) at top and then 3 tabs below it. The xml is

mylist.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="vertical" >


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="0.2"
        android:orientation="vertical" >

        <View
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="0.05"
            android:visibility="invisible" />

        <TextView
            android:id="@+id/list_name"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="0.3"
            android:textColor="@color/loclistitem_text"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/list_spec"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="0.3" />

        <View
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="0.1"
            android:visibility="invisible" />

        <TextView
            android:id="@+id/list_user"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="0.2" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="0.8"
        android:orientation="horizontal" >

        <View
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="0.05"
            android:visibility="invisible" />

        <FrameLayout
            android:id="@+id/list_realtabcontent"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="0.95" />

        <View
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="0.05"
            android:visibility="invisible" />
    </LinearLayout>

    <android.support.v4.app.FragmentTabHost
        android:id="@android:id/tabhost"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#CCF8FB" >

        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="0dip"
            android:layout_height="0dip"
            android:layout_weight="0" />
    </android.support.v4.app.FragmentTabHost>

</LinearLayout>

MyListFragment.java

    public class MyListFragment extends Fragment {

        private FragmentTabHost mTabHost;

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            // TODO Auto-generated method stub

            View rootView = inflater.inflate(R.layout.mylist, container,
                    false);
            TextView name = (TextView) rootView.findViewById(R.id.list_name);
            TextView spec = (TextView) rootView.findViewById(R.id.loc_spec);
            TextView users = (TextView) rootView.findViewById(R.id.list_user);
            name.setText(AppSession.getInstance().getData().getName());
            mTabHost = new FragmentTabHost(getActivity());

            mTabHost.setup(getActivity(), getChildFragmentManager(),
                    R.id.list_realtabcontent);

            Bundle arg1 = new Bundle();
            arg1.putInt("Tab1", 1);

            mTabHost.addTab(
                    mTabHost.newTabSpec("Tab1").setIndicator("Tab1",
                            getResources().getDrawable(R.drawable.tab_left)),
                    Tab1.class, arg1);

            Bundle arg2 = new Bundle();
            arg2.putInt("Tab2", 2);
            mTabHost.addTab(
                    mTabHost.newTabSpec("Tab2").setIndicator("Tab2",
                            getResources().getDrawable(R.drawable.tab_middle)),
                    Tab2.class, arg2);

            Bundle arg3 = new Bundle();
            arg3.putInt("Tab3", 3);
            mTabHost.addTab(
                    mTabHost.newTabSpec("Tab3").setIndicator("Tab3",
                            getResources().getDrawable(R.drawable.tab_rigth)),
                    Tab3Fragment.class, arg2);

            return rootView;

        }

        @Override
        public void onDetach() {
            super.onDetach();

            try {
                Field childFragmentManager = Fragment.class
                        .getDeclaredField("mChildFragmentManager");
                childFragmentManager.setAccessible(true);
                childFragmentManager.set(this, null);

            } catch (NoSuchFieldException e) {
                throw new RuntimeException(e);
            } catch (IllegalAccessException e) {
                throw new RuntimeException(e);
            }
        }

    }

I get "No Tab known for Tag null" at android.support.v4.app.FragmentTabHost.doTabChanged.

The error is resolved if I change return rootView to return mTabHost. But then the fixed area at top isn't showing. Its only displaying 3 tabs at the top of the screen. I tried using Activity to set this particular screen and it worked fine(both fixed area at top and tabs are displayed correctly) but I need it using fragments as I am using Navigation Drawer so this has to be fragment. Please advice.

Modified xml

xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/tabhost"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#CCF8FB" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/loc_playlist_locname"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="0.2" />

        <FrameLayout
            android:id="@+id/playlist_realtabcontent"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="0.1" />

        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="0dip"
            android:layout_height="0dip"
            android:layout_weight="0" />
    </LinearLayout>

</android.support.v4.app.FragmentTabHost>

解决方案

I made a few changes to your code: - In implementation, use the FragmentTabHost specified in layout - Use Framelayout specified within FragmentTabHost Element in layout in TabHost setup method. It seems to work, check out code below:

XML file:

    <?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:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="0.2"
    android:orientation="vertical" >
    <View
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="0.05"
    android:visibility="invisible" />
    <TextView
    android:id="@+id/list_name"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="0.3"
    android:textStyle="bold" />
    <TextView
    android:id="@+id/list_spec"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="0.3" />
   <View
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="0.1"
    android:visibility="invisible" />
    <TextView
    android:id="@+id/list_user"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="0.2" />
    </LinearLayout>
    <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="0.8"
    android:orientation="horizontal" >
    <View
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="0.05"
    android:visibility="invisible" />
   <View
   android:layout_width="0dp"
   android:layout_height="match_parent"
   android:layout_weight="0.05"
   android:visibility="invisible" />
   </LinearLayout>
   <android.support.v4.app.FragmentTabHost
   android:id="@+id/tabhost"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:background="#CCF8FB" >
   <FrameLayout
   android:id="@+id/list_realtabcontent"
   android:layout_width="0dp"
   android:layout_height="match_parent"
   android:layout_weight="0.95" />
   </android.support.v4.app.FragmentTabHost>
   </LinearLayout>

Fragment Class:

    public class MyListFragment extends Fragment {

        private FragmentTabHost mTabHost;

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            // TODO Auto-generated method stub

            View rootView = inflater.inflate(R.layout.activity_main, container,
                    false);
            TextView name = (TextView) rootView.findViewById(R.id.list_name);
            TextView spec = (TextView) rootView.findViewById(R.id.list_spec);
            TextView users = (TextView) rootView.findViewById(R.id.list_user);
            mTabHost = (FragmentTabHost)rootView.findViewById(R.id.tabhost);

            mTabHost.setup(getActivity(), getChildFragmentManager(),
                    R.id.list_realtabcontent);

            Bundle arg1 = new Bundle();
            arg1.putInt("Tab1", 1);

            mTabHost.addTab(
                   mTabHost.newTabSpec("Tab1").setIndicator("Tab1",
                            getResources().getDrawable(R.drawable.tab_chat_unselected)),
                      TabFragment.class, arg1);

            Bundle arg2 = new Bundle();
            arg2.putInt("Tab2", 2);
            mTabHost.addTab(
                    mTabHost.newTabSpec("Tab2").setIndicator("Tab2",
                            getResources().getDrawable(R.drawable.tab_chat_unselected)),
                    TabFragment.class, arg2);

            Bundle arg3 = new Bundle();
            arg3.putInt("Tab3", 3);
            mTabHost.addTab(
                    mTabHost.newTabSpec("Tab3").setIndicator("Tab3",
                            getResources().getDrawable(R.drawable.tab_chat_unselected)),
                    TabFragment.class, arg3);

            return rootView;

        }

这篇关于Android的错误:没有标签的空标签知的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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