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:安卓="http://schemas.安卓.com/apk/res/安卓"
安卓:layout_width="fill_parent"
安卓:layout_height="fill_parent"
安卓:orientation="horizontal" >
<安卓.support.v4.view.ViewPager
安卓:id="@+id/pager"
安卓:layout_width="0px"
安卓:layout_height="match_parent"
安卓:layout_weight="2.5" />
<FrameLayout
安卓:id="@+id/fragment_details"
安卓:layout_width="0px"
安卓:layout_height="match_parent"
安卓:layout_weight="2" />
</LinearLayout>
我的活动歌曲和相册中有两个标签
它在纵向模式下正确加载,但在横向模式下显示类强制转换异常
12-08 04:30:08.198: E/AndroidRuntime(2166): FATAL EXCEPTION: main
12-08 04:30:08.198: E/AndroidRuntime(2166): java.lang.ClassCastException: com.nix.music.activity.fragments.SongDetailsFragment
12-08 04:30:08.198: E/AndroidRuntime(2166): at com.nix.music.activity.fragments.AlbumFragMent.showDetails(AlbumFragMent.java:81)
12-08 04:30:08.198: E/AndroidRuntime(2166): at com.nix.music.activity.fragments.AlbumFragMent.access$0(AlbumFragMent.java:77)
12-08 04:30:08.198: E/AndroidRuntime(2166): at com.nix.music.activity.fragments.AlbumFragMent$1.onItemClick(AlbumFragMent.java:52)
12-08 04:30:08.198: E/AndroidRuntime(2166): at 安卓.widget.AdapterView.performItemClick(AdapterView.java:284)
12-08 04:30:08.198: E/AndroidRuntime(2166): at 安卓.widget.AbsListView$PerformClick.run(AbsListView.java:1696)
12-08 04:30:08.198: E/AndroidRuntime(2166): at 安卓.os.Handler.handleCallback(Handler.java:587)
12-08 04:30:08.198: E/AndroidRuntime(2166): at 安卓.os.Handler.dispatchMessage(Handler.java:92)
12-08 04:30:08.198: E/AndroidRuntime(2166): at 安卓.os.Looper.loop(Looper.java:123)
12-08 04:30:08.198: E/AndroidRuntime(2166): at 安卓.app.ActivityThread.main(ActivityThread.java:4627)
12-08 04:30:08.198: E/AndroidRuntime(2166): at java.lang.reflect.Method.invokeNative(Native Method)
12-08 04:30:08.198: E/AndroidRuntime(2166): at java.lang.reflect.Method.invoke(Method.java:521)
12-08 04:30:08.198: E/AndroidRuntime(2166): at com.安卓.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
12-08 04:30:08.198: E/AndroidRuntime(2166): at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:626)
12-08 04:30:08.198: E/AndroidRuntime(2166): at dalvik.system.NativeStart.main(Native Method)
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
# 1 楼答案
好吧,我来解决这个。。。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