title: Change font size of Toolbar title in CollapsingToolbarLayout in android
body: <p>I have an Toolbar(android.support.v7.widget.Toolbar) inside android.support.design.widget.CollapsingToolbarLayout and i want to change the font size of toolbar title. I have tried app:titleTextAppearance and some older suggestions but they don't work. my code is as bellow.</p>
  
  <pre><code>    &lt;android.support.design.widget.CollapsingToolbarLayout
          android:id="@+id/toolbar_layout"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:fitsSystemWindows="true"
          app:contentScrim="?attr/colorPrimary"
          app:layout_scrollFlags="scroll|exitUntilCollapsed"&gt;
          &lt;ImageView
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:id="@+id/route_detail_image"
              android:src="@drawable/default_image"
              android:scaleType="centerCrop" /&gt;
  
          &lt;TextView
              android:layout_width="match_parent"
              android:layout_height="90dip"
              android:layout_gravity="bottom"
              android:padding="10dip"
              android:background="@color/trans_black"/&gt;
          &lt;android.support.v7.widget.Toolbar
              android:id="@+id/toolbar"
              android:layout_width="match_parent"
              android:layout_height="?attr/actionBarSize"
              app:layout_collapseMode="pin"
              app:elevation="20dp"
              app:titleTextAppearance="@style/route_title"
              app:popupTheme="@style/AppTheme.PopupOverlay"/&gt;
      &lt;/android.support.design.widget.CollapsingToolbarLayout&gt;
  </code></pre>
  
  <p>inside my style.xml</p>
  
  <pre><code>&lt;style name="route_title" parent="android:Widget.TextView"&gt;
      &lt;item name="android:textSize"&gt;14sp&lt;/item&gt;
      &lt;item name="android:color"&gt;#ffff0000&lt;/item&gt;
  &lt;/style&gt;
  </code></pre>
  
  <p>inside .java</p>
  
  <pre><code>Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
  toolbar.setTitle(route_name);
  </code></pre>