As I said, schoolboy error, especially since I've had to do the .setup() call before.
Many thanks to both you and Dianne, Stephen :-) On May 2, 5:56 pm, Mark Murphy <[email protected]> wrote: > You need to call setup() on the TabHost before using it, if you are > not extending TabActivity. Do that before your first addTab() call. > > > > > > > > > > On Mon, May 2, 2011 at 12:50 PM, Stephen <[email protected]> wrote: > > Thanks for the quick response Dianne. Please find below the stack > > trace, the fragment class' code and the layout XML. I've tried using > > either the default tabhost ID (android.R.id.tabhost) or an @+ ID. > > Both result in the NullPointerException. > > > I'm sure it's a schoolboy error somewhere but if you (or anyone else) > > can help I'd much appreciate it. > > > Stephen > > > -= Stack Trace =- > > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): FATAL EXCEPTION: main > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): > > java.lang.NullPointerException > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): at > > android.widget.TabHost$ViewIdContentStrategy.<init>(TabHost.java:615) > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): at > > android.widget.TabHost$ViewIdContentStrategy.<init>(TabHost.java:610) > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): at > > android.widget.TabHost$TabSpec.setContent(TabHost.java:464) > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): at > > uk.co.esstec.android.fragmenttabtest.ContentPaneFragment.onCreateView(Conte > > ntPaneFragment.java: > > 20) > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): at > > android.app.FragmentManagerImpl.moveToState(FragmentManager.java:730) > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): at > > android.app.FragmentManagerImpl.moveToState(FragmentManager.java:921) > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): at > > android.app.BackStackRecord.run(BackStackRecord.java:578) > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): at > > android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java: > > 1221) > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): at > > android.app.FragmentManagerImpl$1.run(FragmentManager.java:375) > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): at > > android.os.Handler.handleCallback(Handler.java:587) > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): at > > android.os.Handler.dispatchMessage(Handler.java:92) > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): at > > android.os.Looper.loop(Looper.java:126) > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): at > > android.app.ActivityThread.main(ActivityThread.java:3997) > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): at > > java.lang.reflect.Method.invokeNative(Native Method) > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): at > > java.lang.reflect.Method.invoke(Method.java:491) > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): at > > com.android.internal.os.ZygoteInit > > $MethodAndArgsCaller.run(ZygoteInit.java:841) > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): at > > com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) > > 05-02 17:18:43.193: ERROR/AndroidRuntime(2446): at > > dalvik.system.NativeStart.main(Native Method) > > > -= Layout XML =- > > > <?xml version="1.0" encoding="utf-8"?> > > <TabHost xmlns:android="http://schemas.android.com/apk/res/android"; > > android:id="@+id/testtabhost1" android:layout_width="fill_parent" > > android:layout_height="fill_parent"> > > <LinearLayout android:orientation="vertical" > > android:layout_width="fill_parent" > > android:layout_height="fill_parent"> > > <TabWidget android:id="@android:id/tabs" > > android:layout_width="fill_parent" > > android:layout_height="wrap_content" /> > > <FrameLayout android:id="@android:id/tabcontent" > > android:layout_width="fill_parent" > > android:layout_height="fill_parent"> > > <TextView android:id="@+id/textview1" > > android:layout_width="fill_parent" > > android:layout_height="fill_parent" > > android:text="this is a tab" / > > > <TextView android:id="@+id/textview2" > > android:layout_width="fill_parent" > > android:layout_height="fill_parent" > > android:text="this is another > > tab" /> > > <TextView android:id="@+id/textview3" > > android:layout_width="fill_parent" > > android:layout_height="fill_parent" > > android:text="this is a third > > tab" /> > > </FrameLayout> > > </LinearLayout> > > </TabHost> > > > -= Fragment Class Code =- > > > package com.test.fragtest; > > > import android.app.Fragment; > > import android.os.Bundle; > > import android.view.LayoutInflater; > > import android.view.View; > > import android.view.ViewGroup; > > import android.widget.TabHost; > > > public class ContentPaneFragment extends Fragment { > > > @Override > > public View onCreateView(LayoutInflater inflater, ViewGroup > > container, > > Bundle savedInstanceState) { > > super.onCreateView(inflater, container, savedInstanceState); > > > View v = inflater.inflate(R.layout.content_pane, container, > > false); > > > TabHost mTabHost = (TabHost) > > v.findViewById(R.id.testtabhost1); > > > > > mTabHost.addTab(mTabHost.newTabSpec("tab_test1").setIndicator("TAB > > 1").setContent(R.id.textview1)); > > > > mTabHost.addTab(mTabHost.newTabSpec("tab_test2").setIndicator("TAB > > 2").setContent(R.id.textview2)); > > > > mTabHost.addTab(mTabHost.newTabSpec("tab_test3").setIndicator("TAB > > 3").setContent(R.id.textview3)); > > > mTabHost.setCurrentTab(0); > > > return v; > > } > > } > > > On May 2, 2:36 pm, Dianne Hackborn <[email protected]> wrote: > >> You can certainly use a TabHost inside of a fragment. TabHost is just a > >> view; it doesn't know anything about whatever is outside the view hierarchy > >> it is running in. > > >> You haven't give the stack crawl of the exception, so it is hard to help > >> further. > > >> On Mon, May 2, 2011 at 7:30 AM, Stephen <[email protected]> wrote: > >> > Having read the post here:http://goo.gl/6xYBD(Android3.0-Tabhost) > >> > and based on the lack of a TabFragment it appears that the way to do > >> > things in 3.0 (and I guess above) is to use tabs in the action bar. > > >> > My issue is that I'm writing an app that has the fairly standard > >> > 'listview on left, content on right' layout, and I'd like my content > >> > on the right to have tabs. I know I can change the right fragment > >> > using the tabs in the action bar, but from a UI perspective, it just > >> > looks wrong. The tabs in the action bar look like they preside over > >> > the *whole* application as they are above the left ListView as well. > >> > For example, in the HoneycombGallery app, the Android/Balloons/ > >> > Bikes.... tabs change both the ListView fragment and the content > >> > fragment. Mine would only change which aspect of the content you're > >> > looking at. > > >> > I tried inflating a TabHost into the fragment but I get > >> > NullPointerExceptions when I run TabSpec.setContent (that may be me > >> > doing something wrong - I'll have another run at debugging it but > >> > figured I'd ask this anyway). > > >> > I hope that all makes sense. If I need to explain better please let > >> > me know. I'm very interested in how others are solving this problem > >> > since I think the 'listview | content' style is quite common. At the > >> > moment, my alternatives are either to fake tabs with buttons > >> > (something I'd rather avoid) or to present menu buttons in the action > >> > bar to change what you're looking at. > > >> > Thank you, > > >> > Stephen > > >> > -- > >> > You received this message because you are subscribed to the Google > >> > Groups "Android Developers" group. > >> > To post to this group, send email to [email protected] > >> > To unsubscribe from this group, send email to > >> > [email protected] > >> > For more options, visit this group at > >> >http://groups.google.com/group/android-developers?hl=en > > >> -- > >> Dianne Hackborn > >> Android framework engineer > >> [email protected] > > >> Note: please don't send private questions to me, as I don't have time to > >> provide private support, and so won't reply to such e-mails. All such > >> questions should be posted on public forums, where I and others can see and > >> answer them. > > > -- > > You received this message because you are subscribed to the Google > > Groups "Android Developers" group. > > To post to this group, send email to [email protected] > > To unsubscribe from this group, send email to > > [email protected] > > For more options, visit this group at > >http://groups.google.com/group/android-developers?hl=en > > -- > Mark Murphy (a Commons > Guy)http://commonsware.com|http://github.com/commonsguyhttp://commonsware.com/blog|http://twitter.com/commonsguy > > _Android Programming Tutorials_ Version 3.4 Available! -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
