Issue with ViewPager inside SherlockFragment

Question

I have created a tabbed control with SherlockFragmentActivity and inside one of the Fragment, I am trying to use the ViewPager.

SettingsActivity.java

public class SettingsActivity extends SherlockFragmentActivity 
{

    SherlockFragment faq = new FAQActivity();
    SherlockFragment help = new HelpGuideActivity();    
    SherlockFragment options= new OptionsActivity();
    SherlockFragment user = new UserActivity();

    @Override
    protected void onCreate(Bundle arg0) {
        super.onCreate(arg0);
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
         setContentView(R.layout.settings_activity);


            ActionBar actionBar = getSupportActionBar();

            actionBar.setDisplayHomeAsUpEnabled(true);

            actionBar.setDisplayShowTitleEnabled(true);
            actionBar.setTitle("");
            actionBar.setLogo(R.drawable.home);

            actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

            Tab faqTab = actionBar.newTab().setText("FAQ");
            Tab helpTab = actionBar.newTab().setText("Instructions");
            Tab optionsTab = actionBar.newTab().setText("Options");
            Tab userTab = actionBar.newTab().setText("User");

            faqTab.setTabListener(new TabListener(faq));
            helpTab.setTabListener(new TabListener(help));
            optionsTab.setTabListener(new TabListener(options));
            userTab.setTabListener(new TabListener(user));

            actionBar.addTab(userTab,true);
            actionBar.addTab(faqTab);
            actionBar.addTab(helpTab);
            actionBar.addTab(optionsTab);

    }

    @Override
    public boolean onMenuItemSelected(int featureId, MenuItem item) {
        // TODO Auto-generated method stub
        finish();
        return super.onMenuItemSelected(featureId, item);
    }


    public class TabListener implements ActionBar.TabListener {

        Fragment fragment;

        public TabListener(Fragment fragment) {
            this.fragment = fragment;
        }

        @Override
        public void onTabSelected(Tab tab, FragmentTransaction ft) {
            ft.replace(R.id.fragment_container, fragment);
        }

        @Override
        public void onTabUnselected(Tab tab, FragmentTransaction ft) {
            ft.remove(fragment);
        }

        @Override
        public void onTabReselected(Tab tab, FragmentTransaction ft) {

        }
    }

}

HelpGuideActivity.java

public class HelpGuideActivity extends SherlockFragment {



    ViewPager viewPager=null;
    InstructionsAdapter adapter =null;
    ImageView iv=null;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        currentLayout = (RelativeLayout) inflater.inflate(R.layout.help_guide_activity, null, false);   
        return currentLayout;
    }



    @Override
    public void onActivityCreated(Bundle savedInstanceState) {

        super.onActivityCreated(savedInstanceState);
@Override
public void onActivityCreated(Bundle savedInstanceState) {

    super.onActivityCreated(savedInstanceState);
    Display display = getActivity().getWindowManager().getDefaultDisplay();
    Point size = new Point();
    display.getSize(size);
    GlobalContent.screenWidth=size.x;
    GlobalContent.screenHeight=size.y;
    viewPager = (ViewPager)currentLayout.findViewById(R.id.instructionPager);
    adapter= new InstructionsAdapter(getChildFragmentManager());        
    viewPager.setAdapter(adapter);
}
    }
    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
    }
    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

    }



}

InstructionsAdapter.java

public class InstructionsAdapter extends FragmentPagerAdapter {

    int[] resources = new int[]{R.drawable.ins_1,R.drawable.ins_2,R.drawable.ins_3,R.drawable.ins_4};

ArrayList fragments ;

    public InstructionsAdapter(FragmentManager fm) {
        super(fm);
        // TODO Auto-generated constructor stub
    }

    @Override
    public Fragment getItem(int arg0) {
        InstructionFragment fr =InstructionFragment.newInstance(resources[arg0]);
        return fr;
    }



public InstructionsAdapter(FragmentManager fm) {
    super(fm);
    fragments  = new ArrayList<Fragment>();
    InstructionFragment fr0 =InstructionFragment.newInstance(resources[0]);
    InstructionFragment fr1 =InstructionFragment.newInstance(resources[1]);
    InstructionFragment fr2 =InstructionFragment.newInstance(resources[2]);
    InstructionFragment fr3 =InstructionFragment.newInstance(resources[3]);
    fragments.add(fr0);
    fragments.add(fr1);
    fragments.add(fr2);
    fragments.add(fr3);
    // TODO Auto-generated constructor stub
}   

@Override
public Fragment getItem(int arg0) {

    return fragments.get(arg0);
}

@Override
public int getCount() {

    return 4;
}

}

InstructionFragment.java

public class InstructionFragment extends SherlockFragment {

    int resID =-1;
    public static final InstructionFragment newInstance(int resId)
    {
        InstructionFragment sf= new InstructionFragment();
        sf.resID=resId;
        return sf;
    }


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        RelativeLayout lt = (RelativeLayout)inflater.inflate(R.layout.help_fragment, null);
        ImageView iv = (ImageView)lt.findViewById(R.id.img);
        iv.setImageBitmap(BitmapFactory.decodeResource(getResources(), resID));
        return lt;
    }
}

Above are the different classes & implementations I used. Now, if we switch to this help tab then its working fine. but, if I go to other tab then I come back then I am following exception

12-02 21:32:49.869: E/AndroidRuntime(1371): FATAL EXCEPTION: main
12-02 21:32:49.869: E/AndroidRuntime(1371): java.lang.IllegalStateException: No activity
12-02 21:32:49.869: E/AndroidRuntime(1371):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1091)
12-02 21:32:49.869: E/AndroidRuntime(1371):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1086)
12-02 21:32:49.869: E/AndroidRuntime(1371):     at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:1877)
12-02 21:32:49.869: E/AndroidRuntime(1371):     at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:1492)
12-02 21:32:49.869: E/AndroidRuntime(1371):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:947)
12-02 21:32:49.869: E/AndroidRuntime(1371):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
12-02 21:32:49.869: E/AndroidRuntime(1371):     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
12-02 21:32:49.869: E/AndroidRuntime(1371):     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460)
12-02 21:32:49.869: E/AndroidRuntime(1371):     at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:440)
12-02 21:32:49.869: E/AndroidRuntime(1371):     at android.os.Handler.handleCallback(Handler.java:730)
12-02 21:32:49.869: E/AndroidRuntime(1371):     at android.os.Handler.dispatchMessage(Handler.java:92)
12-02 21:32:49.869: E/AndroidRuntime(1371):     at android.os.Looper.loop(Looper.java:137)
12-02 21:32:49.869: E/AndroidRuntime(1371):     at android.app.ActivityThread.main(ActivityThread.java:5103)
12-02 21:32:49.869: E/AndroidRuntime(1371):     at java.lang.reflect.Method.invokeNative(Native Method)
12-02 21:32:49.869: E/AndroidRuntime(1371):     at java.lang.reflect.Method.invoke(Method.java:525)
12-02 21:32:49.869: E/AndroidRuntime(1371):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
12-02 21:32:49.869: E/AndroidRuntime(1371):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
12-02 21:32:49.869: E/AndroidRuntime(1371):     at dalvik.system.NativeStart.main(Native Method)

So, I would like to know how to avoid this exception? How to use ViewPager inside the SherlockFragment? What is the mistake I am making in the code?

Answer 1

I think this is what you are searching for:

https://stackoverflow.com/a/16602540/2767703

You need to reinstatiate the fragment.

---

Somebody also did it without the reinstatiating:

https://stackoverflow.com/a/18875394/2767703