activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.developerrandom.belajarmenghubungkanmactivity.MainActivity">

    <Button
        android:id="@+id/activity_1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="KE ACTIVITY 1" />

    <Button
        android:id="@+id/activity_2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="KE ACTIVITY 2" />

    <Button
        android:id="@+id/activity_3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="KE ACTIVITY 3" />

</LinearLayout>