安卓FragmentTabHost：没有标签闻名标签空 [英] Android FragmentTabHost : No tab known for tag null

问题描述

我用低于code，它不渲染图形布局。显示误差异常渲染过程中提出的：没有标签出名的空标签

。

我该如何解决呢？

 ＆LT; android.support.v4.app.FragmentTabHost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＆GT;

    ＆LT;的LinearLayout
        机器人：layout_width =match_parent
        机器人：layout_height =match_parent
        机器人：方向=垂直＆GT;

        ＆LT; TabWidget
            机器人：ID =@机器人：ID /标签
            机器人：layout_width =match_parent
            机器人：layout_height =WRAP_CONTENT
            机器人：layout_weight =0
            机器人：方向=横向/＆GT;

        ＆LT;的FrameLayout
            机器人：ID =@机器人：ID / tabcontent
            机器人：layout_width =0dp
            机器人：layout_height =0dp
            机器人：layout_weight =0/＆GT;

        ＆LT;的FrameLayout
            机器人：ID =@ + ID / realtabcontent
            机器人：layout_width =match_parent
            机器人：layout_height =0dp
            机器人：layout_weight =1/＆GT;
    ＆LT; / LinearLayout中＆GT;

＆LT; /android.support.v4.app.FragmentTabHost>
 

解决方案

这是我用来初始化TabHost的code和正常工作：

 进口android.os.Bundle;
进口android.support.v4.app.Fragment;
进口android.support.v4.app.FragmentTabHost;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;

公共类DetailFragment扩展片段{

    / **
     *必须填写空的构造的片段管理实例的片段（如在屏幕方向变化）。
     * /
    公共DetailFragment（）{
    }

    @覆盖
    公共查看onCreateView（LayoutInflater充气，容器的ViewGroup，捆绑savedInstanceState）{
        // R.layout.fragment_tabs_pager包含布局，在你的问题中指定
        查看rootView = inflater.inflate（R.layout.fragment_tabs_pager，集装箱，假）;

        //初始化标签主机
        FragmentTabHost mTab​​Host =（FragmentTabHost）rootView.findViewById（R.id.tabhost）;
        mTabHost.setup（getActivity（），getChildFragmentManager（），R.id.realtabcontent）;

        //初始化该列表某处与应该显示的内容
        名单＆LT;字符串＆GT; itemsToBeDisplayed;

        对于（字符串子项：itemsToBeDisplayed）{
            //给沿线的名字 - 你可以用它来交出例如一个ID
            叠B =新包（）;
            b.putString（TAB_ITEM_NAME，分项目）;

            //添加一个标签到tabHost
            mTabHost.addTab（mTabHost.newTabSpec（分项）.setIndicator（分项），YourContentFragment.class，B）;
        }
        返回rootView;
    }
}
 

---

  / **
  *这个类包含一个标签的实际内容
  * /
公共类YourContentFragment扩展片段{

    @覆盖
    公共无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;

        捆绑额外= getArguments（）;
        如果（临时演员！= NULL）{
            如果（extras.containsKey（TAB_ITEM_NAME））{
                串子项= extras.getString（TAB_ITEM_NAME）;
                //做一些与该字符串
            }
        }
    }
}
 

I used below code and it is not render graphical layout. display error as Exception raised during rendering: No tab known for tag null.

how can i solve this ?

<android.support.v4.app.FragmentTabHost xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/tabhost"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

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

        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0"
            android:orientation="horizontal" />

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

        <FrameLayout
            android:id="@+id/realtabcontent"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1" />
    </LinearLayout>

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

解决方案

This is the code that I've used to initialise the TabHost and it works fine:

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTabHost;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class DetailFragment extends Fragment {

    /**
     * Mandatory empty constructor for the fragment manager to instantiate the fragment (e.g. upon screen orientation changes).
     */
    public DetailFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // R.layout.fragment_tabs_pager contains the layout as specified in your question
        View rootView = inflater.inflate(R.layout.fragment_tabs_pager, container, false);

        // Initialise the tab-host
        FragmentTabHost mTabHost = (FragmentTabHost) rootView.findViewById(R.id.tabhost);
        mTabHost.setup(getActivity(), getChildFragmentManager(), R.id.realtabcontent);

        // Initialise this list somewhere with the content that should be displayed
        List<String> itemsToBeDisplayed;

        for (String subItem : itemsToBeDisplayed) {
            // Give along the name - you can use this to hand over an ID for example
            Bundle b = new Bundle();
            b.putString("TAB_ITEM_NAME", subItem);

            // Add a tab to the tabHost
            mTabHost.addTab(mTabHost.newTabSpec(subItem).setIndicator(subItem), YourContentFragment.class, b);
        }
        return rootView;
    }
}

---

/**
  * This class contains the actual content of a single tab  
  */
public class YourContentFragment extends Fragment {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Bundle extras = getArguments();
        if (extras != null) {
            if (extras.containsKey("TAB_ITEM_NAME")) {
                String subItem = extras.getString("TAB_ITEM_NAME");
                // Do something with that string
            }
        }
    }
}

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