Android 碎片使用中的问题

嗨，我有一个xml布局，我在每个布局中都将其作为一个片段包含

这是我在maincegories.xml中的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="wrap_content"
android:orientation="vertical">

 <LinearLayout
        android:layout_width="match_parent"
    android:layout_height="wrap_content" 
    android:orientation="horizontal">
    <ImageButton
        android:id="@+id/mainbutton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/logo"
        android:src="@drawable/logo" />
        </LinearLayout>
 <View
    android:id="@+id/viewLine"
    android:layout_width="fill_parent"
    android:layout_height="1dp"
    android:layout_below="@id/txtUserName"
    android:background="#cccccc" />
<ListView
    android:id="@+id/list1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="1dp"
    android:divider="#b5b5b5"
    android:dividerHeight="1dp"
    android:fastScrollEnabled="true"
    android:listSelector="@drawable/list_selector"
    android:smoothScrollbar="true" />
    <fragment 
     android:name="com.rag.xmlparsing.fragmentactivity"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
      />

 </LinearLayout>

而碎片活动类是

public class fragmentactivity extends FragmentActivity {
RadioButton radioButton;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
          Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.actnavbar,
            container, false);


        radioButton = (RadioButton) view.findViewById(R.id.home);
        radioButton.setOnCheckedChangeListener(btnNavBarOnCheckedChangeListener);
        radioButton = (RadioButton) view.findViewById(R.id.aboutus);
        radioButton.setOnCheckedChangeListener(btnNavBarOnCheckedChangeListener);
        radioButton = (RadioButton) view.findViewById(R.id.contactus);
        radioButton.setOnCheckedChangeListener(btnNavBarOnCheckedChangeListener);
        radioButton = (RadioButton) view.findViewById(R.id.orderhistory);
        radioButton.setOnCheckedChangeListener(btnNavBarOnCheckedChangeListener);
        return view;
}
 private CompoundButton.OnCheckedChangeListener btnNavBarOnCheckedChangeListener = new CompoundButton.OnCheckedChangeListener() {
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
           int sid=buttonView.getId();
           int hme=R.id.home;
           int abtus=R.id.aboutus;
           int cnt=R.id.contactus;
           int ordr=R.id.orderhistory;
            if (isChecked) {
                if(sid==hme)
                {
                    //some function
                                 }



                else if(sid==abtus)
                {
                    //some function
                }
                else if(sid==cnt)
                {
                              //
                }
                else if(sid==ordr)
                {

                }

            }
        }
    };


}

还有我的actnavbar.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="60dp"

android:background="@android:color/white"
>
  <RadioGroup
    android:id="@+id/radiogroup"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:orientation="horizontal"
     android:padding="5dp"
    android:background="#cccccc"       
    >

    <RadioButton
        android:id="@+id/home"
        style="@style/navbar_button"
        android:drawableTop="@drawable/home_icon"
        android:text="Home"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
       android:gravity="center_horizontal"

       android:textSize="12sp"
       android:textColor="#333333"
        />

    <RadioButton
        android:id="@+id/aboutus"
        style="@style/navbar_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="About us"
        android:textSize="12sp"
       android:textColor="#333333"
        android:drawableTop="@drawable/aboutus_icon"
        android:gravity="center_horizontal" />

         <RadioButton
           android:id="@+id/contactus"
        style="@style/navbar_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="12sp"
        android:text="Contact us"
       android:textColor="#333333"
        android:drawableTop="@drawable/contact_icon"
        android:gravity="center_horizontal" />

    <RadioButton
        android:id="@+id/orderhistory"
        style="@style/navbar_button"
        android:drawableTop="@drawable/order_history_icon"
        android:text="Order history"
        android:textSize="12sp"
       android:textColor="#333333"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
       android:gravity="center_horizontal"

            />


       </RadioGroup>



</RelativeLayout>

---

我在哪里犯了错误？？？请给出任何建议。

首先，您的类

**fragmentactivity**

是fragmentactivity，您不能在xml文件中使用它

你的代码

public class fragmentactivity extends FragmentActivity

查看类代码

public class fragmentactivity extends Fragment

只有

视图类

文件才能在

xml

文件中使用

这就是您面临

java.lang.ClassNotFoundException:android.view.fragment

错误的原因

这里有很多关于片段的例子

public class fragmentactivity extends FragmentActivity

public class fragmentactivity extends Fragment