app/src/main/res/layout/activity_qrcode_profile.xml
<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"
tools:context=".QrCode.QRcodeProfileActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/profile_qr_code"
android:layout_centerInParent="true"
android:id="@+id/show_qr_code_btn" />
</RelativeLayout>