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I have created my own toolbar and added a button on it but i can't have that button clicked

My goal is to call a fragment from the main activity using a button on a tool bar. I have included this toolbar on my main_activity but what code can I write inside the main_menu javascript so that the "finish button" on the toolbar can call a fragment. I have attached a code below:

<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/bar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/colorPrimaryforLogin"

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

        <Button
            android:id="@+id/finish"
            android:clickable="true"
            android:layout_width="wrap_content"
            android:layout_height="35dp"
            android:layout_alignParentRight="true"
            android:layout_marginRight="15dp"
            android:background="@color/white"
            android:backgroundTint="#FFFFFF"
            android:gravity="center"
            android:text="Finish"
            android:textColor="@color/redcolor"
            android:textSize="11sp" />
        </RelativeLayout>
</androidx.appcompat.widget.Toolbar>
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