How do you remove the back button from a v7 toolbar on Android?

Question

How do you remove the back button from a v7 toolbar on Android?

I highlighted the button that I'm trying to remove in the image below:

Solution

If you are using v7 Toolbar you can remove this button with this code :

if (getSupportActionBar() != null) {
    ActionBar actionBar = getSupportActionBar();
    actionBar.setDisplayHomeAsUpEnabled(false);
}

you can read android here and here for more information. also this question may help