我已经尝试通过使用R.layout.lobby_tab和R.id.lobby_base来识别它(ID被添加为XML声明中的项目).

无论哪种方式,我在setContent(View)方法中得到一个NullPointerException：

02-12 22:42:12.907: E/AndroidRuntime(2028): FATAL EXCEPTION: main
{webs.winbatch.dwd/webs.winbatch.dwd.HostActivity}: java.lang.NullPointerException
02-12 22:42:12.907: E/AndroidRuntime(2028):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
02-12 22:42:12.907: E/AndroidRuntime(2028):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
02-12 22:42:12.907: E/AndroidRuntime(2028):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
02-12 22:42:12.907: E/AndroidRuntime(2028):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
02-12 22:42:12.907: E/AndroidRuntime(2028):     at android.os.Handler.dispatchMessage(Handler.java:99)
02-12 22:42:12.907: E/AndroidRuntime(2028):     at android.os.Looper.loop(Looper.java:123)
02-12 22:42:12.907: E/AndroidRuntime(2028):     at android.app.ActivityThread.main(ActivityThread.java:3683)
02-12 22:42:12.907: E/AndroidRuntime(2028):     at java.lang.reflect.Method.invokeNative(Native Method)
02-12 22:42:12.907: E/AndroidRuntime(2028):     at java.lang.reflect.Method.invoke(Method.java:507)
02-12 22:42:12.907: E/AndroidRuntime(2028):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-12 22:42:12.907: E/AndroidRuntime(2028):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-12 22:42:12.907: E/AndroidRuntime(2028):     at dalvik.system.NativeStart.main(Native Method)
02-12 22:42:12.907: E/AndroidRuntime(2028): Caused by: java.lang.NullPointerException
02-12 22:42:12.907: E/AndroidRuntime(2028):     at android.widget.TabHost$ViewIdContentStrategy.<init>(TabHost.java:589)
02-12 22:42:12.907: E/AndroidRuntime(2028):     at android.widget.TabHost$ViewIdContentStrategy.<init>(TabHost.java:584)
02-12 22:42:12.907: E/AndroidRuntime(2028):     at android.widget.TabHost$TabSpec.setContent(TabHost.java:441)
02-12 22:42:12.907: E/AndroidRuntime(2028):     at webs.winbatch.dwd.HostActivity.setUpTabs(HostActivity.java:20)
02-12 22:42:12.907: E/AndroidRuntime(2028):     at webs.winbatch.dwd.HostActivity.onCreate(HostActivity.java:13)
02-12 22:42:12.907: E/AndroidRuntime(2028):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
02-12 22:42:12.907: E/AndroidRuntime(2028):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
02-12 22:42:12.907: E/AndroidRuntime(2028):     ... 11 more

以下是运行以设置选项卡的代码：

TabHost thost = (TabHost) findViewById(android.R.id.tabhost);
    TabHost.TabSpec spec;

    if(thost !=null) {
        spec = thost.newTabSpec("lobby").setIndicator("Lobby").setContent(R.id.lobby_base);
        thost.addTab(spec);
    }

更新(已解决的问题)

我需要将此行添加到XML文件中的FrameLayout：

<include layout="@layout/lobby_tab"/>

这解决了这个问题.谢谢你的时间！