title: Setting textfield of an fragment
body: <p>I have two activity named School.java and SchoolDetails.java.Under SchoolDetails activity i have used fragments by implementing swipeable tabs.I passed a value from Schools.java to SchoolDetails.java using intent.Now i want to set this value received from Schools.java to a textField which is inside a fragment of SchoolDetails.java activity.I got Following error.</p>
  
  <pre><code> java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Intent.getStringExtra(java.lang.String)' on a null object reference
  </code></pre>
  
  <p>This is all what I did inside Schools.java i passed the name of school to SchoolDetails</p>
  
  <p>School.java</p>
  
  <pre><code>import android.app.ProgressDialog;
  import android.content.Intent;
  import android.support.v7.app.ActionBar;
  import android.support.v7.app.AppCompatActivity;
  import android.os.Bundle;
  import android.util.Log;
  import android.view.Menu;
  import android.view.MenuInflater;
  import android.view.MenuItem;
  import android.view.View;
  import android.widget.AdapterView;
  import android.widget.ListView;
  
  import com.android.volley.Response;
  import com.android.volley.VolleyError;
  import com.android.volley.VolleyLog;
  import com.android.volley.toolbox.JsonArrayRequest;
  import com.example.user.educationhunt.adapter.CustomListAdapter;
  import com.example.user.educationhunt.fragment.About;
  import com.example.user.educationhunt.pojos.AppController;
  import com.example.user.educationhunt.pojos.OurSchool;
  
  import org.json.JSONArray;
  import org.json.JSONException;
  import org.json.JSONObject;
  
  import java.io.Serializable;
  import java.util.ArrayList;
  import java.util.List;
  
  public class School extends AppCompatActivity{
  
      // Log tag
      private static final String TAG = School.class.getSimpleName();
  
      // Billionaires json url
      private static final String url = "http://myeducationhunt.com/public/schools";
  
      private ProgressDialog pDialog;
      private List&lt;OurSchool&gt; ourSchoolsListItems = new ArrayList&lt;OurSchool&gt;();
      private ListView listView;
      private CustomListAdapter adapter;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_school);
  
          ActionBar actionBar=getSupportActionBar();
          actionBar.setDisplayHomeAsUpEnabled(true);
          actionBar.setTitle("Schools");
  
  
          listView = (ListView) findViewById(R.id.list);
          adapter = new CustomListAdapter(this, ourSchoolsListItems);
          listView.setAdapter(adapter);
  
          listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
              @Override
              public void onItemClick(AdapterView&lt;?&gt; parent, View view, int position, long id) {
  
                  OurSchool ourSchool=new OurSchool();
                  Intent i=new Intent(School.this,SchoolDetails.class);
  
                  i.putExtra("id", ourSchoolsListItems.get(position).schoolId);
                  i.putExtra("name", ourSchoolsListItems.get(position).schoolName);
                  i.putExtra("location", ourSchoolsListItems.get(position).schoolLocation);
                  i.putExtra("logo", ourSchoolsListItems.get(position).schoolLogo);
                  i.putExtra("email", ourSchoolsListItems.get(position).schoolEmail);
                  i.putExtra("website", ourSchoolsListItems.get(position).schoolEmail);
                  i.putExtra("created_at", ourSchoolsListItems.get(position).createdAt);
                  i.putExtra("updated_at", ourSchoolsListItems.get(position).updatedAt);
  
                  startActivity(i);
  
              }
          });
  
          pDialog = new ProgressDialog(this);
  // Showing progress dialog before making http request
          pDialog.setMessage("Loading…");
          pDialog.show();
  
  // Creating volley request obj
          JsonArrayRequest billionaireReq = new JsonArrayRequest(url,
                  new Response.Listener&lt;JSONArray&gt;() {
                      @Override
                      public void onResponse(JSONArray response) {
                          Log.d(TAG, response.toString());
                          hidePDialog();
  
                          // Parsing json
                          for (int i = 0; i &lt; response.length(); i++) {
                              try {
  
                                  JSONObject obj = response.getJSONObject(i);
                                  OurSchool ourSchool = new OurSchool();
  
                                  ourSchool.schoolId=obj.getInt("id");
                                  ourSchool.schoolName=obj.getString("name");
                                  ourSchool.schoolLocation=obj.getString("location");
                                  ourSchool.schoolLogo=obj.getString("logo");
                                  ourSchool.schoolEmail=obj.getString("email");
                                  ourSchool.schoolWebsite=obj.getString("website");
                                  ourSchool.createdAt=obj.getString("created_at");
                                  ourSchool.updatedAt=obj.getString("updated_at");
  
                              // adding schools to ourSchool list
                                  ourSchoolsListItems.add(ourSchool);
  
                              } catch (JSONException e) {
                                  e.printStackTrace();
                              }
                          }
  
                          adapter.notifyDataSetChanged();
                      }
                  }, new Response.ErrorListener() {
              @Override
              public void onErrorResponse(VolleyError error) {
                  VolleyLog.d(TAG, "Error: " + error.getMessage());
                  hidePDialog();
              }
          });
  
       // Adding request to request queue
          AppController.getInstance().addToRequestQueue(billionaireReq);
      }
  
      @Override
      public void onDestroy() {
          super.onDestroy();
          hidePDialog();
      }
  
      private void hidePDialog() {
          if (pDialog != null) {
              pDialog.dismiss();
              pDialog = null;
          }
  
      }
  
      @Override
      public boolean onOptionsItemSelected(MenuItem item) {
          switch (item.getItemId()) {
              case android.R.id.home:
                  onBackPressed();
                  return true;
              case R.id.schoolSearch:
              default:
                  return super.onOptionsItemSelected(item);
          }
      }
  
      @Override
      public boolean onCreateOptionsMenu(Menu menu) {
          MenuInflater inflater = getMenuInflater();
          inflater.inflate(R.menu.search, menu);
          return true;
      }
  }
  </code></pre>
  
  <p>SchoolDetails.java</p>
  
  <pre><code>  package com.example.user.educationhunt;
  
  import android.content.Intent;
  import android.support.design.widget.TabLayout;
  import android.support.v4.app.Fragment;
  import android.support.v4.app.FragmentManager;
  import android.support.v4.app.FragmentPagerAdapter;
  import android.support.v4.app.FragmentTransaction;
  import android.support.v4.view.ViewPager;
  import android.support.v7.app.AppCompatActivity;
  import android.os.Bundle;
  import android.support.v7.widget.Toolbar;
  
  import com.example.user.educationhunt.fragment.About;
  import com.example.user.educationhunt.fragment.Admission;
  import com.example.user.educationhunt.fragment.FeeStructure;
  import com.example.user.educationhunt.fragment.Majors;
  import com.example.user.educationhunt.pojos.OurSchool;
  
  import org.junit.runner.Describable;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public class SchoolDetails extends AppCompatActivity{
  
      private Toolbar toolbar;
      private TabLayout tabLayout;
      private ViewPager viewPager;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_school_details);
  
          toolbar = (Toolbar) findViewById(R.id.toolbar);
          setSupportActionBar(toolbar);
  
          getSupportActionBar().setDisplayHomeAsUpEnabled(true);
  
          viewPager = (ViewPager) findViewById(R.id.viewpager);
          setupViewPager(viewPager);
  
          tabLayout = (TabLayout) findViewById(R.id.tabs);
          tabLayout.setupWithViewPager(viewPager);
  
          About aboutFragment= (About) getSupportFragmentManager().findFragmentById(R.id.aboutFragment);
          aboutFragment.aboutSchoolName.setText("name:"+ getIntent().getStringExtra("name"));
  
      }
  
      private void setupViewPager(ViewPager viewPager) {
          ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
          adapter.addFragment(new About(), "ABOUT US");
          adapter.addFragment(new Admission(), "ADMISSION");
  //        adapter.addFragment(new Majors(), "MAJORS");
          adapter.addFragment(new FeeStructure(), "FEE");
          viewPager.setAdapter(adapter);
      }
  
      class ViewPagerAdapter extends FragmentPagerAdapter {
          private final List&lt;Fragment&gt; mFragmentList = new ArrayList&lt;&gt;();
          private final List&lt;String&gt; mFragmentTitleList = new ArrayList&lt;&gt;();
  
          public ViewPagerAdapter(FragmentManager manager) {
              super(manager);
          }
  
          @Override
          public Fragment getItem(int position) {
              return mFragmentList.get(position);
          }
  
          @Override
          public int getCount() {
              return mFragmentList.size();
          }
  
          public void addFragment(Fragment fragment, String title) {
              mFragmentList.add(fragment);
              mFragmentTitleList.add(title);
          }
  
          @Override
          public CharSequence getPageTitle(int position) {
              return mFragmentTitleList.get(position);
          }
      }
  }
  </code></pre>
  
  <p>And finally this is my About Fragment</p>
  
  <pre><code>package com.example.user.educationhunt.fragment;
  
  
  import android.os.Bundle;
  import android.support.v4.app.Fragment;
  import android.support.v4.app.FragmentManager;
  import android.support.v4.app.FragmentTransaction;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  import android.widget.TextView;
  
  import com.example.user.educationhunt.R;
  import com.example.user.educationhunt.School;
  import com.example.user.educationhunt.SchoolDetails;
  import com.example.user.educationhunt.pojos.OurSchool;
  import com.google.android.gms.maps.CameraUpdate;
  import com.google.android.gms.maps.CameraUpdateFactory;
  import com.google.android.gms.maps.GoogleMap;
  import com.google.android.gms.maps.MapView;
  import com.google.android.gms.maps.MapsInitializer;
  import com.google.android.gms.maps.OnMapReadyCallback;
  import com.google.android.gms.maps.model.LatLng;
  import com.google.android.gms.maps.model.MarkerOptions;
  
  import org.junit.runner.Describable;
  
  import java.io.Serializable;
  
  /**
   * A simple {@link Fragment} subclass.
   */
  public class About extends Fragment implements OnMapReadyCallback{
  
      MapView mapView;
      GoogleMap map;
      public TextView aboutSchoolName,aboutSchoolLocation,aboutSchoolNumber,aboutSchoolEmail,aboutSchoolWebsite,aboutSchoolCategory;
  
  
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
                               Bundle savedInstanceState) {
          // Inflate the layout for this fragment
          View v = inflater.inflate(R.layout.fragment_about, container, false);
  
          aboutSchoolName= (TextView) v.findViewById(R.id.about_school_name);
          aboutSchoolLocation= (TextView) v.findViewById(R.id.about_school_location);
          aboutSchoolNumber= (TextView) v.findViewById(R.id.about_school_number);
          aboutSchoolCategory= (TextView) v.findViewById(R.id.about_school_category);
          aboutSchoolEmail= (TextView) v.findViewById(R.id.about_school_email);
          aboutSchoolWebsite= (TextView) v.findViewById(R.id.about_school_website);
  
  //        School school=new School();
  //        aboutSchoolName.setText("name:"+ school.getIntent().getStringExtra("name"));
  
  
  
          // Gets the MapView from the XML layout and creates it
          mapView = (MapView) v.findViewById(R.id.mapview);
          mapView.onCreate(savedInstanceState);
  
          // Gets to GoogleMap from the MapView and does initialization stuff
          map = mapView.getMap();
          map.getUiSettings().setMyLocationButtonEnabled(false);
          map.setMyLocationEnabled(true);
  
          // Needs to call MapsInitializer before doing any CameraUpdateFactory calls
          MapsInitializer.initialize(this.getActivity());
  
          // Updates the location and zoom of the MapView
          CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(new LatLng(27.6933, 85.3211), 15);
          map.animateCamera(cameraUpdate);
          onMapReady(map);
  
          return v;
      }
  
      @Override
      public void onResume() {
          mapView.onResume();
          super.onResume();
      }
  
      @Override
      public void onDestroy() {
          super.onDestroy();
          mapView.onDestroy();
      }
  
      @Override
      public void onLowMemory() {
          super.onLowMemory();
          mapView.onLowMemory();
      }
  
      @Override
      public void onMapReady(GoogleMap map) {
          map.addMarker(new MarkerOptions()
                  .position(new LatLng(27.6933, 85.3211))
                  .title("St. Xavier's College"));
      }
  }
  </code></pre>
  
  <p>Can somebody please help me out?</p>