Java 片段和ViewPager类CastException

我正在使用带有操作栏选项卡的viewpager，布局中有两个片段，问题是我遇到了类强制转换异常

我的xml文件如下所示

 <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="horizontal" >

        <android.support.v4.view.ViewPager
            android:id="@+id/pager"
            android:layout_width="0px"
            android:layout_height="match_parent"
            android:layout_weight="2.5" />

        <FrameLayout
            android:id="@+id/fragment_details"
            android:layout_width="0px"
            android:layout_height="match_parent"
            android:layout_weight="2" />
    </LinearLayout>

错误显示在这里

在AlbumFragMent中，双模式的类代码为

if (mDualPane) {
    AlbumDetailFragment details = (AlbumDetailFragment) getFragmentManager()
            .findFragmentById(R.id.fragment_details);
    if (details == null || details.getShownIndex() != index) {
        // Make new fragment to show this selection.
        details = AlbumDetailFragment.newInstance(index);

        // Execute a transaction, replacing any existing fragment
        // with this one inside the frame.
        FragmentTransaction ft = getFragmentManager()
                .beginTransaction();
        ft.replace(R.id.fragment_details, details);
        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
        ft.commit();

    }
}

在

SongFragment

类中

if (mDualPane) {
    getListView().setItemChecked(index, true);

    SongDetailsFragment details = (SongDetailsFragment) getFragmentManager()
            .findFragmentById(R.id.fragment_details);
    if (details == null || details.getShownIndex() != index) {
        // Make new fragment to show this selection.
        details = SongDetailsFragment.newInstance(index);

        // Execute a transaction, replacing any existing fragment
        // with this one inside the frame.
        FragmentTransaction ft = getFragmentManager()
                .beginTransaction();
        ft.replace(R.id.fragment_details, details);
        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
        ft.commit();
    }
}

两者唯一的区别是调用的detailfragment类

我做错了吗

---

还有什么我们需要处理的吗。

好的，我来解决这个问题。。。这个解决方案有点奇怪，但对我来说很有效

我决定使用公共细节片段类，而不是为每个选项卡使用单独的片段类。并根据当前选择显示内容

if (mDualPane) {
    getListView().setItemChecked(index, true);

    SongDetailsFragment details = (SongDetailsFragment) getFragmentManager()
            .findFragmentById(R.id.fragment_details);
    if (details == null || details.getShownIndex() != index) {
        // Make new fragment to show this selection.
        details = SongDetailsFragment.newInstance(index);

        // Execute a transaction, replacing any existing fragment
        // with this one inside the frame.
        FragmentTransaction ft = getFragmentManager()
                .beginTransaction();
        ft.replace(R.id.fragment_details, details);
        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
        ft.commit();
    }
}