How to add back arrow button in toolbar android

How to add back array button in toolbar android

1.add toolbar in layout xml file first

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="48dp"
/>
   
2.In activity file give reference to toolbar

Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
    //What to do on back clicked
    onBackPressed();
    }
});