How to programmatically display back arrow on toolbar in android

In this android programming source code example, we are going to programmatically display back arrow on toolbar in android.

Below is a step by step source code to programmatically display back arrow on toolbar in android.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<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=".toolbar.Toolbar5">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar_top"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:minHeight="?attr/actionBarSize"
        android:background="@color/colorAccent"
        app:popupTheme="@style/AppTheme.PopupOverlay"  >

    </android.support.v7.widget.Toolbar>

</android.support.design.widget.CoordinatorLayout>

MainActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;

public class Toolbar5 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_toolbar5);

        Toolbar toolbar = findViewById(R.id.toolbar_top);
        toolbar.setTitle("Display Home Button");
        setSupportActionBar(toolbar);
        getSupportActionBar();
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    }
}

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