Android: intenta invocar el método virtual 'void android.support.v4.app.Fragment.setMenuVisibility (boolean)' en una referencia de objeto nulo

Aquí está el rastro completo de la pila del error: http://pastebin.com/5dQHkUw3

El error comenzó a aparecer sólo después de que comencé a usar fragmentos en el proyecto, porque quiero dar feeds JSON. Estaba bien antes cuando estaba creando Tabs, NavigationDrawer, etc.

• FragmentStatePagerAdapter OutOfMemoryError
• No se puede crear una instancia del tipo PagerAdapter
• Fragmento en ViewPager en Fragmento no se vuelve a cargar en el cambio de orientación
• Cargar sólo un fragmento en ViewPager
• Destruye el elemento del adaptador de ViewPager después de cambiar la orientación de la pantalla

MainActivity.java

Public class MainActivity extends ActionBarActivity implementa MaterialTabListener {

private Toolbar mToolbar; private NavigationDrawerFragment mDrawerFragment; private DrawerLayout mDrawerLayout; private MaterialTabHost mTabHost; private ViewPager mViewPager; public static final int SERVICES_ALL = 1; public static final int SERVICES_FEATURED = 2; public static final int SERVICES_NEW = 3; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main_appbar); mToolbar = (Toolbar) findViewById(R.id.app_bar); setSupportActionBar(mToolbar); getSupportActionBar().setDisplayShowHomeEnabled(true); mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); mDrawerFragment = (NavigationDrawerFragment) getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer); mDrawerFragment.setUp(R.id.fragment_navigation_drawer, mDrawerLayout, mToolbar); mTabHost = (MaterialTabHost) findViewById(R.id.materialTabHost); mViewPager = (ViewPager) findViewById(R.id.viewPager); MyPagerAdapter adapter = new MyPagerAdapter(getSupportFragmentManager()); mViewPager.setAdapter(adapter); mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener(){ @Override public void onPageSelected(int position) { mTabHost.setSelectedNavigationItem(position); } }); for(int i=0; i<adapter.getCount(); i++ ){ mTabHost.addTab( mTabHost.newTab(). setText(adapter.getPageTitle(i)). setTabListener(this) ); } } @Override public void onTabSelected(MaterialTab materialTab) { mViewPager.setCurrentItem(materialTab.getPosition()); } @Override public void onTabReselected(MaterialTab materialTab) { } @Override public void onTabUnselected(MaterialTab materialTab) { } private class MyPagerAdapter extends FragmentStatePagerAdapter{ FragmentManager fragmentManager; public MyPagerAdapter(FragmentManager fm) { super(fm); fragmentManager = fm; } @Override public Fragment getItem(int num) { Fragment fragment = null; switch (num){ case SERVICES_ALL: fragment = FragmentAll.newInstance("",""); break; case SERVICES_FEATURED: fragment = FragmentFeatured.newInstance("",""); break; case SERVICES_NEW: fragment = FragmentNew.newInstance("",""); break; } return fragment; } @Override public int getCount() { return 3; } public CharSequence getPageTitle(int position){ return getResources().getStringArray(R.array.tabs)[position]; } } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu_main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); if (id == R.id.action_settings) { Toast.makeText(this, "Hey you just hit " + item.getTitle(), Toast.LENGTH_LONG).show(); return true; } if (id == R.id.action_next) { startActivity(new Intent(this, DetailActivity.class)); } return super.onOptionsItemSelected(item); } 

}

FragmentAll.java (Los otros 2 fragmentos son similares a FragmentAll.)

Clase pública FragmentAll extends Fragment {

 private static final String ARG_PARAM1 = "param1"; private static final String ARG_PARAM2 = "param2"; private String mParam1; private String mParam2; public static FragmentAll newInstance(String param1, String param2) { FragmentAll fragment = new FragmentAll(); Bundle args = new Bundle(); args.putString(ARG_PARAM1, param1); args.putString(ARG_PARAM2, param2); fragment.setArguments(args); return fragment; } public FragmentAll() { // Required empty public constructor } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (getArguments() != null) { mParam1 = getArguments().getString(ARG_PARAM1); mParam2 = getArguments().getString(ARG_PARAM2); } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment return inflater.inflate(R.layout.fragment_all, container, false); } } 

El stacktrace:

 android.support.v4.app.Fragment.setMenuVisibility(boolean)' on a null object reference at android.support.v4.app.FragmentStatePagerAdapter.instantiateItem(FragmentStatePagerAdapter.java:116) at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:836) at android.support.v4.view.ViewPager.populate(ViewPager.java:986) at android.support.v4.view.ViewPager.populate(ViewPager.java:918) at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1440) at android.view.View.measure(View.java:17430) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) at android.widget.LinearLayout.onMeasure(LinearLayout.java:613) at android.view.View.measure(View.java:17430) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) at android.support.v7.internal.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:124) at android.view.View.measure(View.java:17430) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) at android.widget.LinearLayout.onMeasure(LinearLayout.java:613) at android.view.View.measure(View.java:17430) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) at android.view.View.measure(View.java:17430) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) at android.widget.LinearLayout.onMeasure(LinearLayout.java:613) at android.view.View.measure(View.java:17430) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2560) at android.view.View.measure(View.java:17430) at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2001) at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1166) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1372) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1054) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5779) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767) at android.view.Choreographer.doCallbacks(Choreographer.java:580) at android.view.Choreographer.doFrame(Choreographer.java:550) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5221) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) 

 public static final int SERVICES_ALL = 1; public static final int SERVICES_FEATURED = 2; public static final int SERVICES_NEW = 3; 

 public static final int SERVICES_ALL = 0; public static final int SERVICES_FEATURED = 1; public static final int SERVICES_NEW = 2;