如何使 android 中的按钮出现在固定的 position 中并始终位于所有其他视图的前面？

Question

I know the code might not be well formatted but I want the button (last tag) to always appear in front of all other views if the description is long the button disappears. I'm using scrollView and if any long text appears but this makes the button go down the screen.

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:gravity="center|bottom"
        android:orientation="vertical">

        <Button
            android:layout_gravity="bottom|end"
            android:id="@+id/cart_button"
            android:layout_width="250dp"
            android:layout_height="55dp"
            android:layout_marginBottom="10dp"
            android:iconTint="@color/black"
            android:elevation="6dp"
            android:text="ADD TO CART"
            android:textAppearance="?attr/textAppearanceButton"
            android:textColor="#28022E"
            android:textSize="20sp"
            app:backgroundTint="#F6F2FA"
            app:elevation="10dp"
            app:rippleColor="#FFF"
            app:shapeAppearance="?attr/shapeAppearanceSmallComponent"
            app:strokeColor="#0000"
            app:strokeWidth="10dp" />
    </RelativeLayout>

Answer 1

Take your button out of scrollview. something like:

<RelativeLayout 
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 >
   <ScrollView
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    // content that you wants to scroll

   </ScrollView>

   <Button alignParentBottom="true"
           android:layout_width="match_parent"
           android:layout_height="wrap_content"  />

</RelativeLayout>