Question

I have a system of actionbar Tabs with ABS. The first tab is a login tab. I store the logged in user in a local SQLite db and a web SQL db. When the user hits the loginButton and the Async loginTask completes, I’d like to change the login tab’s xml layout.

So basically I can run a test to see if the user is logged in, and if so use a new layout. Is there any reasonable way to complete the layout switch in a SherlockFragment that resides in a system of actionBar tabs?

Obviously I would need to run the same checks inside of onResume as well to make sure if the user is logged in, the right UI shows up. My problem there is a currently inflate my layout inside onCreateView, which doesn’t rerun.

Here’s some code:

public class LoginFragment extends SherlockFragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    userFunctions = new UserFunctions();
//test ive made that has no effect since onCreateView only runs once.
    if(userFunctions.isUserLoggedIn(activity.getApplicationContext())) {
        View v = inflater.inflate(R.layout.loggedin, container, false);
        return v;
    } else {//standard method when I didnt use the above test
    View v = inflater.inflate(R.layout.loginfragment, container, false);
    return v;
    }
}

I have an activity that hosts the tabs etc, here’s its relevant code:

public static class TabsAdapter extends FragmentPagerAdapter
implements ActionBar.TabListener, ViewPager.OnPageChangeListener {
    private final Context mContext;
    private final ActionBar mActionBar;
    private final ViewPager mViewPager;
    private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();

    static final class TabInfo {
        private final Class<?> clss;
        private final Bundle args;

        TabInfo(Class<?> _class, Bundle _args) {
            clss = _class;
            args = _args;
        }
    }
    /*Constructor method that adds a TabsAdapter to each tab that is created.
     * It also adds the ViewPager to each tab so that the user can swipe to change tabs.
     */
    public TabsAdapter(SherlockFragmentActivity activity, ViewPager pager) {
        super(activity.getSupportFragmentManager());
        mContext = activity;
        mActionBar = activity.getSupportActionBar();
        mViewPager = pager;
        mViewPager.setAdapter(this);
        mViewPager.setOnPageChangeListener(this);
    }
    /*A fairly simple method that sets the TabInfo for each tab so that the TabsAdapter
     * knows which class the tab that is being added actually belonds to. It also updates
     * the UI interface when each tab is added. 
     */
    public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args) {
        TabInfo info = new TabInfo(clss, args);
        tab.setTag(info);
        tab.setTabListener(this);
        mTabs.add(info);
        mActionBar.addTab(tab);
        notifyDataSetChanged();
    }

    public int getCount() {
        return mTabs.size();
    }
    /*A method that is used in other classes to allow each tab Fragment to 
     * access its inherited methods from a mother-class, in this case, SherlockFragment
     */
    public SherlockFragment getItem(int position) {
        TabInfo info = mTabs.get(position);
        return (SherlockFragment)Fragment.instantiate(mContext, info.clss.getName(), info.args);
    }
    /*This method reads the user's selection for a new tab and sets that tab as
     * the new current focus.*/
    public void onPageSelected(int position) {
        mActionBar.setSelectedNavigationItem(position);
    }
    public void onPageScrollStateChanged(int state) {}
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}
    /* This is the method that actually draws the newest tab onto the screen when
     * it is selected.*/
    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        mViewPager.setCurrentItem(tab.getPosition());
        Object tag = tab.getTag();
        for (int i=0; i<mTabs.size(); i++) {
            if (mTabs.get(i) == tag) {
                mViewPager.setCurrentItem(i);
            }
        }
    }
    public void onTabUnselected(Tab tab, FragmentTransaction ft) {}
    public void onTabReselected(Tab tab, FragmentTransaction ft) {}
    public void onTabReselected(Tab tab, android.app.FragmentTransaction ft) {}
    public void onTabUnselected(Tab tab, android.app.FragmentTransaction ft) {}
}

Answer 1

Inside your fragment layout, you can use a ViewSwitcher to switch between two views, one for the login, and another one for the info you want to show when the user is logged.