我正在使用FragmentTabHost和android支持库,
我的布局文件 sub_main.xml :
<android.support.v4.app.FragmentTabHost
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="0"
android:orientation="horizontal" />
<FrameLayout
android:id="@+id/tabFrameLayout"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
</android.support.v4.app.FragmentTabHost>
以上布局用于我的片段:
public class MyFragment extends Fragment{
...
private FragmentTabHost mTabHost;
private View content;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View content = inflater.inflate(R.layout.sub_main, null);
// the following code throw ClassCastException, why?
mTabHost = (FragmentTabHost) content.findViewById(android.R.id.tabhost);
return content;
}
...
}
但是,我在上面的代码中得到了 ClassCastException 异常,其中mTabHost
在onCreateView()中初始化:
07-03 16:35:09.704: E/AndroidRuntime(25350): java.lang.ClassCastException: android.widget.TabHost cannot be cast to android.support.v4.app.FragmentTabHost
它抱怨TabHost
无法投放到FragmentTabHost
,为什么&amp;如何摆脱它。感谢。
答案 0 :(得分:1)
mTabHost = (FragmentTabHost) content.findViewById(android.R.id.tabhost);
应该是
mTabHost = (FragmentTabHost) content.findViewById(R.id.tabhost);
并在xml布局中指定
android:id="@android:id/tabhost"
作为
android:id="@+id/tabhost"