Google Map V2 crash when used in ViewPager fragment?-Collection of common programming errors

I have a problem where I’m trying to use Google Maps v2 in my Android app.

My plan is to have a viewpager with two pages (a “detail” page and a “googlemap” page)

I’ve set the whole thing up, and it’s giving me some weird results:

When I start swiping to the “googlemap” page, in the middle of the animation (like if I hold the viewpager halfway), I can see the map load up properly.It’s just there.

All the things I’ve set up (markers, camera, animation…) run as they are supposed to.

But as soon I complete the swipe, and the googlemap page takes over the entire screen, the whole thing crashes.

Any idea what could cause it?

Here is all the relevant code:

FragmentMap.xml

MapFragment.java

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;

public class MapFragment extends Fragment {

    private GoogleMap map;
    private static View view;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
        if (view != null) 
        {
            ViewGroup parent = (ViewGroup) view.getParent();
            if (parent != null)
                parent.removeView(view);
        }
        view = inflater.inflate(R.layout.fragment_map, container, false);
        map = ((SupportMapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();

        getActivity().getSupportFragmentManager().popBackStack();
        return view;

    }

    public static MapFragment newInstance() {
        MapFragment f = new MapFragment();
        return f;
    }
}

DetailActivity.java

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;

public class DetailActivity extends FragmentActivity {

    int extraID;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_detail_holder);

        Intent prevIntent = getIntent();
        extraID = prevIntent.getIntExtra("selected_ID", 0);

        ViewPager pager = (ViewPager) findViewById(R.id.viewpager);
        pager.setAdapter(new MyPagerAdapter(getSupportFragmentManager()));
    }

    private class MyPagerAdapter extends FragmentPagerAdapter {

        public MyPagerAdapter(FragmentManager fm) {
            super(fm);
        }
        @Override
        public Fragment getItem(int pos) {
            switch (pos) {
            case 0:
                return DetailFragment.newInstance(extraID);
            case 1:
                return MapFragment.newInstance();
            default:
                return null;
            }
        }

        @Override
        public int getCount() {
            return 2;
        }
    }
}

detailHolder.xml

EDIT: logcat

09-28 13:41:42.830: E/AndroidRuntime(12693): FATAL EXCEPTION: main
09-28 13:41:42.830: E/AndroidRuntime(12693): java.lang.NullPointerException
09-28 13:41:42.830: E/AndroidRuntime(12693):    at android.support.v4.app.BackStackRecord.doAddOp(BackStackRecord.java:394)
09-28 13:41:42.830: E/AndroidRuntime(12693):    at android.support.v4.app.BackStackRecord.add(BackStackRecord.java:389)
09-28 13:41:42.830: E/AndroidRuntime(12693):    at android.support.v4.app.FragmentPagerAdapter.instantiateItem(FragmentPagerAdapter.java:99)
09-28 13:41:42.830: E/AndroidRuntime(12693):    at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:832)
09-28 13:41:42.830: E/AndroidRuntime(12693):    at android.support.v4.view.ViewPager.populate(ViewPager.java:1048)
09-28 13:41:42.830: E/AndroidRuntime(12693):    at android.support.v4.view.ViewPager.populate(ViewPager.java:914)
09-28 13:41:42.830: E/AndroidRuntime(12693):    at android.support.v4.view.ViewPager$3.run(ViewPager.java:244)
09-28 13:41:42.830: E/AndroidRuntime(12693):    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
09-28 13:41:42.830: E/AndroidRuntime(12693):    at android.view.Choreographer.doCallbacks(Choreographer.java:562)
09-28 13:41:42.830: E/AndroidRuntime(12693):    at android.view.Choreographer.doFrame(Choreographer.java:531)
09-28 13:41:42.830: E/AndroidRuntime(12693):    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
09-28 13:41:42.830: E/AndroidRuntime(12693):    at android.os.Handler.handleCallback(Handler.java:725)
09-28 13:41:42.830: E/AndroidRuntime(12693):    at android.os.Handler.dispatchMessage(Handler.java:92)
09-28 13:41:42.830: E/AndroidRuntime(12693):    at android.os.Looper.loop(Looper.java:137)
09-28 13:41:42.830: E/AndroidRuntime(12693):    at android.app.ActivityThread.main(ActivityThread.java:5230)
09-28 13:41:42.830: E/AndroidRuntime(12693):    at java.lang.reflect.Method.invokeNative(Native Method)
09-28 13:41:42.830: E/AndroidRuntime(12693):    at java.lang.reflect.Method.invoke(Method.java:525)
09-28 13:41:42.830: E/AndroidRuntime(12693):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:799)
09-28 13:41:42.830: E/AndroidRuntime(12693):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)
09-28 13:41:42.830: E/AndroidRuntime(12693):    at dalvik.system.NativeStart.main(Native Method)