Android - Switch ActionBar Back Button to Navigation Button
<p>I am having the following problem:</p>

<p>I know how to set up a toolbar to show a back button icon instead of a burger button icon.
<br><br>
From this:
<br>
<a href="https://i.stack.imgur.com/Sx26a.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Sx26a.png" alt="enter image description here"></a></p>

<p>to this:</p>

<p><a href="https://i.stack.imgur.com/dF12T.png" rel="noreferrer"><img src="https://i.stack.imgur.com/dF12T.png" alt="enter image description here"></a></p>

<p>using: <code>getSupportActionBar().setDisplayHomeAsUpEnabled(true);</code></p>

<p><br>Now, I want to do the reverse action, I want to go from back button icon to burger icon:</p>

<p><a href="https://i.stack.imgur.com/dF12T.png" rel="noreferrer"><img src="https://i.stack.imgur.com/dF12T.png" alt="enter image description here"></a></p>

<p>to here:</p>

<p><a href="https://i.stack.imgur.com/Sx26a.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Sx26a.png" alt="enter image description here"></a></p>

<p>How can I do this?</p>

<p><strong>Update:</strong></p>

<pre><code>@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setSupportActionBar(mToolbar);
    getSupportActionBar().setDisplayShowTitleEnabled(false);
}

private void enableViews(boolean enable) {
    if(enable) {
        // Enables back button icon
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    } else {
        // TODO: Enables burger icon
    }
}
</code></pre>