title: Toolbar title in Fragments
body: <p>How can i change <code>Textview</code> inside <code>Toolbar</code> when Fragments are changed? My toolbar is in a <code>BaseActivity</code>, so i could use in all activities.</p>
  
  <pre><code>&lt;android.support.v7.widget.Toolbar
                  android:id="@+id/toolbar"
                  android:layout_width="match_parent"
                  android:layout_height="?attr/actionBarSize"
                  app:popupTheme="@style/AppTheme.PopupOverlay"&gt;
  
                  &lt;FrameLayout
                      android:layout_width="match_parent"
                      android:layout_height="match_parent"&gt;
  
                      &lt;TextView
                          android:id="@+id/toolbar_title"
                          android:layout_width="wrap_content"
                          android:layout_height="wrap_content"
                          android:layout_gravity="center"
                          android:layout_marginBottom="4dp"
                          android:layout_marginLeft="20dp"
                          ndroid:layout_marginRight="attr/actionBarSize"
                          android:layout_marginTop="4dp"
                          android:textColor="@color/colorAccent2"
                          android:textSize="19sp"
                          tools:ignore="HardcodedText" /&gt;
  
  
                  &lt;/FrameLayout&gt;
              &lt;/android.support.v7.widget.Toolbar&gt;
  </code></pre>