title: How to change the toolbar name and put icon with tool bar
body: <p>I have just made the app using android studio template of Navigation view. Its all working fine but I have the following two requirements </p>
  
  <ol>
  <li>I want to center the toolbar title. </li>
  <li>I want to put the image beside the title.</li>
  </ol>
  
  <p>Here is my xml:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:fitsSystemWindows="true"
  tools:context="com.abdulsalam.lahoreqalander.MainActivity"&gt;
  
  &lt;android.support.design.widget.AppBarLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:theme="@style/AppTheme.AppBarOverlay"&gt;
  
      &lt;android.support.v7.widget.Toolbar
          android:id="@+id/toolbar"
          android:layout_width="match_parent"
          android:layout_height="?attr/actionBarSize"
          android:background="?attr/colorPrimary"
          app:popupTheme="@style/AppTheme.PopupOverlay" /&gt;
  
  &lt;/android.support.design.widget.AppBarLayout&gt;
  
  &lt;include layout="@layout/content_main" /&gt;
  
  &lt;!--&lt;android.support.design.widget.FloatingActionButton--&gt;
      &lt;!--android:id="@+id/fab"--&gt;
      &lt;!--android:layout_width="wrap_content"--&gt;
      &lt;!--android:layout_height="wrap_content"--&gt;
      &lt;!--android:layout_gravity="bottom|end"--&gt;
      &lt;!--android:layout_margin="@dimen/fab_margin"--&gt;
      &lt;!--android:src="@android:drawable/ic_dialog_email" /&gt;--&gt;
  </code></pre>
  
  <p></p>
  
  <p><strong>Problem :</strong></p>
  
  <p>I do not know where the title string is saved, I have checked the string.xml and there is the app name and that is exactly showing on the toolbar title. </p>
  
  <p>So Any suggestion where can I change the title string without changing the app name , In fact I want to change it custom and also how to put the image beside it. </p>
  
  <blockquote>
    <p>Note I am using the template made by Android studio</p>
  </blockquote>
  
  <p>. </p>