activity_edit.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
    tools:context=".EditActivity">


    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:fillViewport="true">
        <EditText
            android:id="@+id/etText"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="top|left"/>
    </ScrollView>

    <LinearLayout
        android:id="@+id/linearLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/btnSave"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:text="Save"
            android:background="@drawable/add_button_background"/>

        <Button
            android:id="@+id/btnCencel"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_gravity="bottom"
            android:layout_weight="1"
            android:text="Cencel"
            android:background="@drawable/add_button_background"/>

    </LinearLayout>


</LinearLayout>