意外的命名空间preFIX＆QUOT;的xmlns＆QUOT;发现标签片段 [英] Unexpected namespace prefix "xmlns" found for tag fragment

问题描述

我得到一个错误：

意外的命名空间preFIX的xmlns找到的标记片段

Unexpected namespace prefix "xmlns" found for tag fragment

有关行

 <fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"

在

  <?xml version="1.0" encoding="utf-8"?>
        <TabHost android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@android:id/tabhost"
        xmlns:android="http://schemas.android.com/apk/res/android"
        >
        <TabWidget
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@android:id/tabs"
        />
         <FrameLayout
         android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@android:id/tabcontent"
         >
         <fragment xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/item_list"
        android:name="com.example.storeitemfinder.ItemListFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="16dp"
        tools:context=".ItemListActivity"
        tools:layout="@android:layout/list_content" />
         </FrameLayout>
        </TabHost>

有谁知道什么是错的？

Does anyone know what's wrong?

推荐答案

删除此

 xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"

在XML片段

http://developer.android.com/guide/topics/资源/布局resource.html

根元素可以是一个ViewGroup中，视图或元素，但只能有一个根元素，它必须包含的xmlns：android的属性与Android命名空间，如图

The root element can be either a ViewGroup, a View, or a element, but there must be only one root element and it must contain the xmlns:android attribute with the android namespace as shown.

要确保我只是通过文章下方是类似于去

To make sure i just went through the below posts that are similar

<一个href=\"http://stackoverflow.com/questions/16511605/unexpected-namespace-$p$pfix-xmlns-for-tag-fragment\">Unexpected命名空间preFIX＆QUOT;的xmlns＆QUOT;对于标记片段

<一个href=\"http://stackoverflow.com/questions/14916638/unexpected-namespace-$p$pfix-xmlns-found-for-tag-linearlayout\">Unexpected命名空间preFIX＆QUOT;的xmlns＆QUOT;发现标签的LinearLayout

<一个href=\"http://stackoverflow.com/questions/16952259/unexpected-namespace-$p$pfix-xmlns-found-for-tag-listview\">Unexpected命名空间preFIX＆QUOT;的xmlns＆QUOT;发现标签的ListView

编辑：

从您在评论张贴链接，它看起来像你正在寻找的是卡口与片段。因此，尝试下面并修改根据您的要求。

From the link you posted in your comment it looks like you are looking for is tabs with fragments. So try the below and modify according to your requirements.

例如：

我已经设置分SDK是11

I have set min sdk is 11

MainActivity.java

MainActivity.java

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        final ActionBar actionBar = getActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        Tab tabA = actionBar.newTab();
        tabA.setText("Tab A");
        tabA.setTabListener(new TabListener<MyFragmentA>(this, "Tag A", MyFragmentA.class));
        actionBar.addTab(tabA);

        Tab tabB = actionBar.newTab();
        tabB.setText("Tab B");
        tabB.setTabListener(new TabListener<MyFragmentB>(this, "Tag B", MyFragmentB.class));
        actionBar.addTab(tabB);

        Tab tabC = actionBar.newTab();
        tabC.setText("Tab C");
        tabC.setTabListener(new TabListener<MyFragmentC>(this, "Tag C", MyFragmentC.class));
        actionBar.addTab(tabC);

        if (savedInstanceState != null) {
            int savedIndex = savedInstanceState.getInt("SAVED_INDEX");
            getActionBar().setSelectedNavigationItem(savedIndex);
        }

    }

 @Override
 protected void onSaveInstanceState(Bundle outState) {
  // TODO Auto-generated method stub
  super.onSaveInstanceState(outState);
  outState.putInt("SAVED_INDEX", getActionBar().getSelectedNavigationIndex());
 }

 public static class TabListener<T extends Fragment> 
     implements ActionBar.TabListener{

        private final Activity myActivity;
        private final String myTag;
        private final Class<T> myClass;

        public TabListener(Activity activity, String tag, Class<T> cls) {
            myActivity = activity;
            myTag = tag;
            myClass = cls;
        }

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

   Fragment myFragment = myActivity.getFragmentManager().findFragmentByTag(myTag);

   // Check if the fragment is already initialized
         if (myFragment == null) {
             // If not, instantiate and add it to the activity
             myFragment = Fragment.instantiate(myActivity, myClass.getName());
             ft.add(android.R.id.content, myFragment, myTag);
         } else {
             // If it exists, simply attach it in order to show it
             ft.attach(myFragment);
         }

  }

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

   Fragment myFragment = myActivity.getFragmentManager().findFragmentByTag(myTag);

   if (myFragment != null) {
             // Detach the fragment, because another one is being attached
             ft.detach(myFragment);
         }

  }

  @Override
  public void onTabReselected(Tab tab, FragmentTransaction ft) {
   // TODO Auto-generated method stub

  }

    }
}

Framgent A

Framgent A

public class MyFragmentA extends Fragment {

 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
   Bundle savedInstanceState) {
  View myFragmentView = inflater.inflate(R.layout.fragment_a, container, false);
  return myFragmentView;
 }

}

片段B

public class MyFragmentB extends Fragment {

 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
   Bundle savedInstanceState) {
  View myFragmentView = inflater.inflate(R.layout.fragment_b, container, false);
  return myFragmentView;
 }

}

C片段

public class MyFragmentC extends Fragment {

 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
   Bundle savedInstanceState) {
  View myFragmentView = inflater.inflate(R.layout.fragment_c, container, false);
  return myFragmentView;
 }

}

碎片A

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:orientation="vertical" >
   <TextView
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:text="It's Fragment A" />
   <ImageView
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:src="@drawable/ic_launcher"/>
</LinearLayout>

片段B XML

fragment b xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:orientation="vertical" >
   <TextView
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:text="It's Fragment B" />
   <ImageView
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:scaleType="center"
       android:src="@drawable/ic_launcher"/>
</LinearLayout>

C片段XML

fragment c xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:orientation="vertical" >
   <TextView
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:text="It's Fragment C" />

</LinearLayout>

快照

这篇关于意外的命名空间preFIX＆QUOT;的xmlns＆QUOT;发现标签片段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！