title: CardView selector?
body: <p>I'm creating a notes app and I'm using a contextual action bar to delete notes. I have my notes displayed in a card view. I have the action bar working to the point where I can select notes and delete them. But when I select notes I want to use a checkmark as a selector if possible (otherwise any selector) which I have been unsuccessful in achieving.</p>
  
  <p>contextual action bar</p>
  
  <pre><code>mListViewNotes = (ListView) findViewById(R.id.listview_notes);
      mListViewNotes.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
      mListViewNotes.setMultiChoiceModeListener(new AbsListView.MultiChoiceModeListener() {
  
          CardView cardView = (CardView) findViewById(R.id.cardView);
  
          @Override
          public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
              if (list_items.contains(notes.get(position))) {
                  count = count-1;
                  list_items.remove(notes.get(position));
                  mode.setTitle(count + " Notes Selected");
              } else {
                  count = count+1;
                  list_items.add(notes.get(position));
                  mode.setTitle(count + " Notes Selected");
              }
  
              if (count == 0) {
                  mode.setTitle("No Notes Selected");
              }
          }
  
          @Override
          public boolean onCreateActionMode(ActionMode mode, Menu menu) {
  
              app_bar.setVisibility(View.GONE);
              MenuInflater inflater = mode.getMenuInflater();
              inflater.inflate(R.menu.context_menu, menu);
              actionMode = mode;
              return true;
          }
  
          @Override
          public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
              return false;
          }
  
          @Override
          public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
              deleteNote();
              return true;
          }
  
          @Override
          public void onDestroyActionMode(ActionMode mode) {
              count = 0;
              app_bar.setVisibility(View.VISIBLE);
              list_items.clear();
          }
      });
  }
  </code></pre>
  
  <p>item_note.xml</p>
  
  <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:background="@color/light_sand"
  android:orientation="vertical"
  android:id="@+id/item_note"&gt;
  
  &lt;android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:card_view="http://schemas.android.com/apk/res-auto"
      android:id="@+id/cardView"
      android:layout_width="match_parent"
      android:layout_height="150dp"
      android:layout_gravity="center"
      android:layout_marginBottom="6dp"
      android:layout_marginEnd="8dp"
      android:layout_marginLeft="8dp"
      android:layout_marginRight="8dp"
      android:layout_marginStart="8dp"
      android:layout_marginTop="6dp"
      card_view:cardCornerRadius="4dp"
      card_view:cardElevation="6dp"&gt;
  
      &lt;ImageView
          android:layout_width="1000dp"
          android:layout_height="150dp"
          android:layout_gravity="start"
          android:layout_marginLeft="-80dp"
          android:layout_marginTop="-12dp"
          android:background="@drawable/texture_tile_old"
          android:scaleType="fitStart" /&gt;
  
      &lt;ImageView
          android:id="@+id/clef_note"
          android:layout_width="70dp"
          android:layout_height="120dp"
          android:layout_gravity="start"
          android:layout_marginTop="10dp"
          android:background="@drawable/treble_clef" /&gt;
  
      &lt;View
          android:layout_width="780dp"
          android:layout_height="1dp"
          android:layout_marginLeft="8dp"
          android:layout_marginTop="43dp"
          android:background="@color/black" /&gt;
  
      &lt;View
          android:layout_width="780dp"
          android:layout_height="1dp"
          android:layout_marginLeft="8dp"
          android:layout_marginTop="70dp"
          android:background="@color/black" /&gt;
  
      &lt;View
          android:layout_width="780dp"
          android:layout_height="1dp"
          android:layout_marginLeft="8dp"
          android:layout_marginTop="97dp"
          android:background="@color/black" /&gt;
  
      &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:orientation="vertical"
          android:scaleType="center"&gt;
  
          &lt;TextView
              android:id="@+id/list_note_title"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:layout_marginLeft="65dp"
              android:layout_marginTop="8dp"
              android:textColor="@color/black"
              android:textSize="28sp" /&gt;
  
          &lt;TextView
              android:id="@+id/list_note_content"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:layout_marginBottom="46dp"
              android:layout_marginLeft="65dp"
              android:layout_marginTop="0dp"
              android:maxLines="2"
              android:textColor="@color/gunmetal"
              android:textSize="20sp"
              android:lineSpacingExtra="4dp"/&gt;
      &lt;/LinearLayout&gt;
  
      &lt;LinearLayout
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:layout_gravity="bottom"
          android:background="@color/brown"
          android:orientation="horizontal"&gt;
  
          &lt;TextView
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_marginLeft="4dp"
              android:text="Last Updated:"
              android:textColor="@color/white" /&gt;
  
          &lt;TextView
              android:id="@+id/list_note_date"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:layout_marginRight="4dp"
              android:gravity="end"
              android:textAppearance="?android:attr/textAppearanceSmall"
              android:textColor="@color/white" /&gt;
      &lt;/LinearLayout&gt;
  &lt;/android.support.v7.widget.CardView&gt;
  </code></pre>
  
  <p></p>