AndroidExcelReadWrite activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    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=".activity.MainActivity">

    <android.support.v7.widget.AppCompatButton
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/ekspor"
        android:id="@+id/button_export"/>

    <android.support.v7.widget.AppCompatButton
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button_export"
        android:text="@string/baca_file"
        android:id="@+id/button_read_file"/>

</RelativeLayout>