title: Fragment getActivity().getContentResolver().query() returning null
body: <p>Hello I make a <code>Fragment</code> now I m trying to show all my contacts name to my <code>ListView</code> I have done all things but i m still getting <code>Cursor</code> null I have also called <code>getActivity()</code>. still the error is same.</p>
  
  <pre><code>public class AllContacts extends Fragment {
  
  
  public AllContacts() {
      // Required empty public constructor
  
  }
  
  
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
                           Bundle savedInstanceState) {
  
      View view = inflater.inflate(R.layout.fragment_all_contacts, container, false);
      ListView list = (ListView) view.findViewById(R.id.listview);
  
      ArrayList&lt;String&gt; arraylist= new ArrayList&lt;&gt;();
  
  
      String sorting = ContactsContract.Contacts.DISPLAY_NAME+ "DESC";
      Uri uri = Uri.parse("content://ContactsContract");
      Cursor c = getActivity().getContentResolver().query(uri,null,null,null,sorting);
      while (c.moveToNext()) {
  
          String contactName = c.getString(c.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
  
          arraylist.add(contactName);
      }//end loop
         c.close();
      ArrayAdapter adapter = new ArrayAdapter(getContext(),android.R.layout.simple_list_item_1,arraylist);
  
      list.setAdapter(adapter);
      return view;
  }
  
  }
  </code></pre>
  
  <p><strong>Exception:</strong></p>
  
  <pre><code>FATAL EXCEPTION: main
  
   Process: com.example.awais_pc.contactapp, PID: 25641
  java.lang.NullPointerException: Attempt to invoke interface method 'boolean android.database.Cursor.moveToNext()' on a null object reference
  at com.example.awais_pc.contactapp.AllContacts.onCreateView(AllContacts.java:43)
  at android.support.v4.app.Fragment.performCreateView(Fragment.java:1974)
  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1067)
  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1252)
  at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:742)
  at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1617)
  at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:570)
  at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
  at android.support.v4.view.ViewPager.populate(ViewPager.java:1177)
  at android.support.v4.view.ViewPager.populate(ViewPager.java:1025)
  at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1545)
  at android.view.View.measure(View.java:20151)
  at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:716)
  at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:462)
  at android.view.View.measure(View.java:20151)
  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6328)
  at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
  at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135)
  at android.view.View.measure(View.java:20151)
  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6328)
  at android.support.v7.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:391)
  at android.view.View.measure(View.java:20151)
  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6328)
  at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
  at android.view.View.measure(View.java:20151)
  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6328)
  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
  at android.widget.LinearLayout.measureVertical(LinearLayout.java:747)
  at android.widget.LinearLayout.onMeasure(LinearLayout.java:629)
  at android.view.View.measure(View.java:20151)
  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6328)
  at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
  at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:3158)
  at android.view.View.measure(View.java:20151)
  at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2594)
  at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1549)
  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1841)
  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1437)
  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7397)
  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:920)
  at android.view.Choreographer.doCallbacks(Choreographer.java:695)
  at android.view.Choreographer.doFrame(Choreographer.java:631)
  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:906)
  at android.os.Handler.handleCallback(Handler.java:739)
  at android.os.Handler.dispatchMessage(Handler.java:95)
  at android.os.Looper.loop(Looper.java:158)
  at android.app.ActivityThread.main(ActivityThread.java:7224)
  at java.lang.reflect.Method.invoke(Native Method)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
  </code></pre>