Hamburger icon doesn't show as default icon in toolbar
<p>This is my <code>setUpToolbar</code> method . and it's called in onCreate in mainActivity . my question is , why humberger icon doesn't show in toolbar and toolbar show the back navigation icon in toolbar .</p>

<p>this is my <code>setUptoolbar</code> method.</p>

<pre><code>private void setUpToolbar() {

        Toolbar archiveToolbar = (Toolbar)findViewById(R.id.xmlToolbarMain);
        setSupportActionBar(archiveToolbar);

        getSupportActionBar().setDisplayShowTitleEnabled(false);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    }
</code></pre>

<p>and This is my toolbar xml :</p>

<pre><code> &lt;android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/xmlToolbarMain"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="#34465d"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
            android:transitionName="actionBar"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
            /&gt;
</code></pre>

<p>and this is my style under the values dir :</p>

<pre><code>&lt;resources&gt;

    &lt;!-- Base application theme. --&gt;
    &lt;style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar"&gt;
        &lt;!-- Customize your theme here. --&gt;
        &lt;item name="colorPrimary"&gt;@color/colorPrimary&lt;/item&gt;
        &lt;item name="colorPrimaryDark"&gt;@color/colorPrimaryDark&lt;/item&gt;
        &lt;item name="colorAccent"&gt;@color/colorAccent&lt;/item&gt;
    &lt;/style&gt;


&lt;/resources&gt;
</code></pre>

<p><a href="https://i.stack.imgur.com/WX4fp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WX4fp.png" alt="enter image description here"></a></p>