title: how to place Cardview in a fragment
body: <p>Good Day, 
  i have an app, with a Main activity, Fragment and Tabbed Fragments. i am trying to use Cardview to display a list of posts on my Allposts fragment. But when i run it, nothing shows.</p>
  
  <p>MainActivity.java</p>
  
  <pre><code>package com.example.stephan.regnotifier;
  
  import android.content.Intent;
  import android.os.Bundle;
  import android.support.design.widget.NavigationView;
  import android.support.v4.app.FragmentManager;
  import android.support.v4.app.FragmentTransaction;
  import android.support.v4.widget.DrawerLayout;
  import android.support.v7.app.ActionBarDrawerToggle;
  import android.support.v7.app.AppCompatActivity;
  import android.view.MenuItem;
  
  import com.example.stephan.regnotifier.activity.AboutFragment;
  import com.example.stephan.regnotifier.activity.PostsFragment;
  import com.example.stephan.regnotifier.activity.SettingsFragment;
  import com.example.stephan.regnotifier.activity.TabFragment;
  import com.example.stephan.regnotifier.activity.TimetableFragment;
  
  public class MainActivity extends AppCompatActivity{
      DrawerLayout mDrawerLayout;
      NavigationView mNavigationView;
      FragmentManager mFragmentManager;
      FragmentTransaction mFragmentTransaction;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
  
          /**
           *Setup the DrawerLayout and NavigationView
           */
  
          mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
          mNavigationView = (NavigationView) findViewById(R.id.shitstuff) ;
  
          /**
           * Lets inflate the very first fragment
           * Here , we are inflating the TabFragment as the first Fragment
           */
  
          mFragmentManager = getSupportFragmentManager();
          mFragmentTransaction = mFragmentManager.beginTransaction();
          mFragmentTransaction.replace(R.id.containerView,new TabFragment()).commit();
          /**
           * Setup click events on the Navigation View Items.
           */
  
          mNavigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
              @Override
              public boolean onNavigationItemSelected(MenuItem menuItem) {
                  mDrawerLayout.closeDrawers();
  
  
  
                  if (menuItem.getItemId() == R.id.nav_item_timetable) {
                      FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
                      fragmentTransaction.replace(R.id.containerView,new TimetableFragment()).commit();
  
                  }
  
                  if (menuItem.getItemId() == R.id.nav_item_post) {
                      FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction();
                      xfragmentTransaction.replace(R.id.containerView,new TabFragment()).commit();
                  }
  
                  if (menuItem.getItemId() == R.id.nav_item_profile) {
                      FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction();
                      xfragmentTransaction.replace(R.id.containerView,new PostsFragment()).commit();
  
  
                  }
  
                  if (menuItem.getItemId() == R.id.nav_item_settings) {
                      FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction();
                      xfragmentTransaction.replace(R.id.containerView,new SettingsFragment()).commit();
                  }
  
                  if (menuItem.getItemId() == R.id.nav_item_about) {
                      FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction();
                      xfragmentTransaction.replace(R.id.containerView,new AboutFragment()).commit();
                  }
  
                  if (menuItem.getItemId() == R.id.nav_item_logout) {
                      Intent logout = new Intent(MainActivity.this, LoginActivity.class);
                      startActivity(logout);
                  }
  
                  return false;
              }
  
          });
  
          /**
           * Setup Drawer Toggle of the Toolbar
           */
  
          android.support.v7.widget.Toolbar toolbar = (android.support.v7.widget.Toolbar) findViewById(R.id.toolbar);
          ActionBarDrawerToggle mDrawerToggle = new ActionBarDrawerToggle(this,mDrawerLayout, toolbar,R.string.app_name,
                  R.string.app_name);
  
          mDrawerLayout.setDrawerListener(mDrawerToggle);
  
          mDrawerToggle.syncState();
  
      }
  }
  </code></pre>
  
  <p>AllpostsFragment.java</p>
  
  <pre><code>package com.example.stephan.regnotifier.activity;
  
  
  import android.content.Context;
  import android.os.Bundle;
  import android.support.v4.app.Fragment;
  import android.support.v7.widget.CardView;
  import android.support.v7.widget.DefaultItemAnimator;
  import android.support.v7.widget.LinearLayoutManager;
  import android.support.v7.widget.RecyclerView;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  
  import com.example.stephan.regnotifier.R;
  
  /**
   * A simple {@link Fragment} subclass.
   */
  public class AllpostsFragment extends Fragment {
  
  
      public AllpostsFragment() {
          // Required empty public constructor
      }
  
  
      CardView mCardView;
      RecyclerView mRecyclerView;
      RecyclerView.LayoutManager mLayoutManager;
      RecyclerView.Adapter mAdapter;
      Context context;
  
      public static AllpostsFragment newInstance() {
          AllpostsFragment fragment = new AllpostsFragment();
          fragment.setRetainInstance(true);
          return fragment;
      }
  
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
  
      }
  
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
                               Bundle savedInstanceState) {
          // Inflate the layout for this fragment
          View v = inflater.inflate(R.layout.fragment_allposts, container, false);
          RecyclerView rv = (RecyclerView)v.findViewById(R.id.cardList);
          mLayoutManager = new LinearLayoutManager(context, LinearLayoutManager.HORIZONTAL, false);
          rv.setLayoutManager(mLayoutManager);
          rv.setItemAnimator(new DefaultItemAnimator());
          rv.setHasFixedSize(true);
          return v;
      }
  
      @Override
      public void onViewCreated(View view, Bundle savedInstanceState) {
          super.onViewCreated(view, savedInstanceState);
  
  
      }
  
  }
  </code></pre>
  
  <p>PostList.java</p>
  
  <pre><code>package com.example.stephan.regnotifier.model;
  
  /**
   * Created by StephAn on 18-Feb-16.
   */
  public class Posts_list {
      private String mName;
      private int mThumbnail;
  
      public String getName() {
          return mName;
      }
  
      public void setName(String name) {
          this.mName = name;
      }
  
      public int getThumbnail() {
          return mThumbnail;
      }
  
      public void setThumbnail(int thumbnail) {
          this.mThumbnail = thumbnail;
      }
  }
  </code></pre>
  
  <p>CardAdapter.java</p>
  
  <pre><code>package com.example.stephan.regnotifier.adapter;
  
  import android.support.v7.widget.RecyclerView;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  import android.widget.ImageView;
  import android.widget.TextView;
  
  import com.example.stephan.regnotifier.R;
  import com.example.stephan.regnotifier.model.Posts_list;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Created by StephAn on 18-Feb-16.
   */
  public class CardAdapter extends RecyclerView.Adapter&lt;CardAdapter.CardViewHolder&gt;{
      List&lt;Posts_list&gt; pItems;
  
      public CardAdapter() {
          super();
          pItems = new ArrayList&lt;Posts_list&gt;();
          Posts_list posts_list = new Posts_list();
          posts_list.setName("The Amazing Spider-Man 2");
          posts_list.setThumbnail(R.drawable.sample);
          pItems.add(posts_list);
  
          posts_list = new Posts_list();
          posts_list.setName("X-men: Days of Future Past");
          posts_list.setThumbnail(R.drawable.sample);
          pItems.add(posts_list);
  
          posts_list = new Posts_list();
          posts_list.setName("The Hunger Game");
          posts_list.setThumbnail(R.drawable.sample);
          pItems.add(posts_list);
  
          posts_list = new Posts_list();
          posts_list.setName("Guardians of the Galaxy");
          posts_list.setThumbnail(R.drawable.sample);
          pItems.add(posts_list);
  
          posts_list = new Posts_list();
          posts_list.setName("Maleficent");
          posts_list.setThumbnail(R.drawable.sample);
          pItems.add(posts_list);
  
          posts_list = new Posts_list();
          posts_list.setName("How to Train Your Dragon 2");
          posts_list.setThumbnail(R.drawable.sample);
          pItems.add(posts_list);
  
          posts_list = new Posts_list();
          posts_list.setName("What If");
          posts_list.setThumbnail(R.drawable.sample);
          pItems.add(posts_list);
      }
  
      @Override
      public CardViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
          View v = LayoutInflater.from(viewGroup.getContext())
                  .inflate(R.layout.card_view_layout, viewGroup, false);
          CardViewHolder viewHolder = new CardViewHolder(v);
          return viewHolder;
      }
  
      @Override
      public void onBindViewHolder(CardViewHolder cardViewHolder, int i) {
          Posts_list posts_list = pItems.get(i);
          cardViewHolder.tvMovie.setText(posts_list.getName());
          cardViewHolder.imgThumbnail.setImageResource(posts_list.getThumbnail());
      }
  
      @Override
      public int getItemCount() {
          return pItems.size();
      }
  
      class CardViewHolder extends RecyclerView.ViewHolder{
  
          public ImageView imgThumbnail;
          public TextView tvMovie;
  
          public CardViewHolder(View itemView) {
              super(itemView);
              imgThumbnail = (ImageView)itemView.findViewById(R.id.img_thumbnail);
              tvMovie = (TextView)itemView.findViewById(R.id.tv_movie);
          }
      }
  }
  </code></pre>
  
  <p>fragment_allpost.xml</p>
  
  <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:paddingLeft="@dimen/activity_horizontal_margin"
      android:paddingRight="@dimen/activity_horizontal_margin"
      android:paddingTop="@dimen/activity_vertical_margin"
      android:paddingBottom="@dimen/activity_vertical_margin"
      tools:context=".MyActivity"&gt;
  
      &lt;android.support.v7.widget.RecyclerView
          android:id="@+id/cardList"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          /&gt;
  
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p>card_view_layout.xml</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:card_view="http://schemas.android.com/apk/res-auto"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:orientation="vertical"&gt;
  
      &lt;android.support.v7.widget.CardView
          android:layout_width="fill_parent"
          android:layout_height="wrap_content"
          card_view:contentPadding="@dimen/activity_horizontal_margin"
          card_view:cardCornerRadius="3dp"&gt;
  
          &lt;ImageView
              android:id="@+id/img_thumbnail"
              android:layout_width="fill_parent"
              android:layout_height="150dp" /&gt;
  
          &lt;TextView
              android:id="@+id/tv_movie"
              android:layout_width="fill_parent"
              android:layout_height="50dp"
              android:paddingLeft="@dimen/activity_horizontal_margin"
              android:paddingRight="@dimen/activity_horizontal_margin"
              android:layout_gravity="bottom"
              android:gravity="center_vertical"
              android:background="#757575"
              android:alpha="0.8"
              android:textSize="@dimen/abc_text_size_headline_material"
              android:text="Test"/&gt;
  
      &lt;/android.support.v7.widget.CardView&gt;
  
  &lt;/LinearLayout&gt;
  </code></pre>