title: Adding Gridview to fragment it's crashing
body: <p>I'm following a tutorial and trying to build in a grid view into my fragment and every time I launch the app it crashes. I opened up LogCat and it gives me nothing... Can someone help me find out what I can do to get this to display correctly and not crash the app? Thank you!!!</p>
  
  <p>Below I've included my Main Activity, GridView Adapter and Fragment...</p>
  
  <p><strong>MainActivity</strong></p>
  
  <pre><code>import android.app.Activity;
  import android.os.Bundle;
  import android.support.v4.app.Fragment;
  import android.support.v4.app.FragmentManager;
  import android.support.v4.widget.DrawerLayout;
  import android.support.v7.app.ActionBar;
  import android.support.v7.app.ActionBarActivity;
  import android.view.LayoutInflater;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.view.View;
  
  
     import android.view.ViewGroup;
  
  
  public class MainActivity extends ActionBarActivity
          implements NavigationDrawerFragment.NavigationDrawerCallbacks {
  
      /**
       * Fragment managing the behaviors, interactions and presentation of the navigation drawer.
       */
      private NavigationDrawerFragment mNavigationDrawerFragment;
  
      /**
       * Used to store the last screen title. For use in {@link #restoreActionBar()}.
       */
      private Char
  
  Sequence mTitle;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
      mNavigationDrawerFragment = (NavigationDrawerFragment)
              getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
  
      // Set the first title
      mTitle = "Inventory";
  
      // Set up the drawer.
      mNavigationDrawerFragment.setUp(
              R.id.navigation_drawer,
              (DrawerLayout) findViewById(R.id.drawer_layout));
  
      // Remove shadow under actionbar
      getSupportActionBar().setElevation(0);
  }
  
  @Override
  public void onNavigationDrawerItemSelected(int position) {
  
      Fragment objFragment = null;
  
      switch (position) {
          case 0:
              objFragment = new Inventory_Fragment();
              mTitle = getString(R.string.title_section1);
              break;
          case 1:
              objFragment = new Orders_Fragment();
              mTitle = getString(R.string.title_section2);
              break;
          case 2:
              objFragment = new Cart_Fragment();
              mTitle = getString(R.string.title_section3);
              break;
          case 3:
              objFragment = new Settings_Fragment();
              mTitle = getString(R.string.title_section4);
              break;
      }
  
  
      // update the main content by replacing fragments
      FragmentManager fragmentManager = getSupportFragmentManager();
      fragmentManager.beginTransaction()
              .replace(R.id.container, objFragment)
              .commit();
  }
  
  public void onSectionAttached(int number) {
      switch (number) {
          case 1:
              mTitle = getString(R.string.title_section1);
              break;
          case 2:
              mTitle = getString(R.string.title_section2);
              break;
          case 3:
              mTitle = getString(R.string.title_section3);
              break;
          case 4:
              mTitle = getString(R.string.title_section4);
              break;
      }
  }
  
  public void restoreActionBar() {
      ActionBar actionBar = getSupportActionBar();
      actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
      actionBar.setDisplayShowTitleEnabled(true);
      actionBar.setTitle(mTitle);
  }
  
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
      if (!mNavigationDrawerFragment.isDrawerOpen()) {
          // Only show items in the action bar relevant to this screen
          // if the drawer is not showing. Otherwise, let the drawer
          // decide what to show in the action bar.
          getMenuInflater().inflate(R.menu.main, menu);
          restoreActionBar();
          return true;
      }
      return super.onCreateOptionsMenu(menu);
  }
  
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
      // Handle action bar item clicks here. The action bar will
      // automatically handle clicks on the Home/Up button, so long
      // as you specify a parent activity in AndroidManifest.xml.
      int id = item.getItemId();
  
      return super.onOptionsItemSelected(item);
  }
  
  /**
   * A placeholder fragment containing a simple view.
   */
  public static class PlaceholderFragment extends Fragment {
      /**
       * The fragment argument representing the section number for this
       * fragment.
       */
      private static final String ARG_SECTION_NUMBER = "section_number";
  
      /**
       * Returns a new instance of this fragment for the given section
       * number.
       */
      public static PlaceholderFragment newInstance(int sectionNumber) {
          PlaceholderFragment fragment = new PlaceholderFragment();
          Bundle args = new Bundle();
          args.putInt(ARG_SECTION_NUMBER, sectionNumber);
          fragment.setArguments(args);
          return fragment;
      }
  
      public PlaceholderFragment() {
      }
  
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
                               Bundle savedInstanceState) {
          View rootView = inflater.inflate(R.layout.inventory_layout, container, false);
          return rootView;
      }
  
      @Override
      public void onAttach(Activity activity) {
          super.onAttach(activity);
          ((MainActivity) activity).onSectionAttached(
                  getArguments().getInt(ARG_SECTION_NUMBER));
      }
  }
  
  // MARK: - Helpers
  public void setActionBarTitle(String title) {
      getSupportActionBar().setTitle(title);
  }
  
  }
  </code></pre>
  
  <p><strong>GridViewAdapter</strong></p>
  
  <pre><code>import android.content.Context;
  import android.view.View;
  import android.view.ViewGroup;
  import android.widget.BaseAdapter;
  import android.widget.GridView;
  import android.widget.ImageView;
  
  /**
   * Created by kenbarlow on 5/20/15.
   */
  public class GridViewAdapter extends BaseAdapter {
      private Context context;
  
      public GridViewAdapter(Context context) {
          context = context;
      }
  
      private int[] icons = {
              // Temporary
          R.drawable.image1,
          R.drawable.image2,
          R.drawable.image3,
          R.drawable.image4,
          R.drawable.image5,
          R.drawable.image6,
          R.drawable.image7,
          R.drawable.image8,
          R.drawable.image9,
          R.drawable.image10,
          R.drawable.image11,
          R.drawable.image12,
          R.drawable.image13,
          R.drawable.image14,
          R.drawable.image15,
          R.drawable.image16,
          R.drawable.image17
  
  };
  
  
  @Override
  public int getCount() {
      return icons.length;
  }
  
  @Override
  public Object getItem(int position){
      return null;
  }
  
  @Override
  public long getItemId(int position) {
      return 0;
  }
  
  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
      ImageView imageView;
      if (convertView == null) {
          imageView = new ImageView(context);
          imageView.setLayoutParams(new GridView.LayoutParams(100, 100));
          imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
          imageView.setPadding(10, 10, 10, 10);
      } else {
          imageView = (ImageView) convertView;
      }
      imageView.setImageResource(icons[position]);
      return imageView;
  }
  }
  </code></pre>
  
  <p><strong>Inventory_Fragment --- I Feel like the problem is in here but I'm not sure.</strong></p>
  
  <pre><code>import android.os.Bundle;
  import android.support.annotation.Nullable;
  import android.support.v4.app.Fragment;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  import android.widget.GridView;
  
  /**
   * Created by kenbarlow on 5/19/15.
   */
  public class Inventory_Fragment extends Fragment {
  
      View rootView;
  
      @Nullable
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
          rootView = inflater.inflate(R.layout.inventory_layout, container, false);
  
      GridView gridview = (GridView) getActivity().findViewById(R.id.gridview);
      gridview.setAdapter(new GridViewAdapter(this));
  
  
      return rootView;
  }
  
  }
  </code></pre>