Layout_alignParentRight and others aren't working on my Android Studio : I'm simply trying to do the first app-making lesson on Udacity with making a birthday card app. It asks me to put "From yourName" on the birthday card to the bottom right. I tried using android:layout_alignParentRight and android:layout_alignParentBottom and nothing has changed.

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-js -->

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.constraint.ConstraintLayout 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"
        tools:context=".MainActivity">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Happy Birthday friendName!"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_alignParentBottom="true"
            android:text="From yourName!"
            android:layout_alignParentEnd="true" />

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:src="@drawable/androidparty" />
</android.support.constraint.ConstraintLayout>