How to fix the WeightSum and Weight in XML? : [Please find Image][1]

> Here is my Layout XML: I am writing this Code for my Application

        <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:layout_width="match_parent"
            android:layout_height="match_parent"
        tools:context=".FullScreenImageActivity">
        
            <com.github.chrisbanes.photoview.PhotoView
                android:id="@+id/image11"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_centerHorizontal="true"
                android:layout_centerVertical="true"
                android:src="@drawable/navimage" />
        
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentBottom="true"
                android:layout_margin="4dp"
                android:orientation="horizontal"
                android:weightSum="2">
        
                <com.google.android.material.floatingactionbutton.FloatingActionButton
                    android:id="@+id/download_btn"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:src="@drawable/download"
                    app:backgroundTint="@android:color/white" />
        
                <com.google.android.material.floatingactionbutton.FloatingActionButton
                    android:id="@+id/download_sbtn"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:src="@drawable/download"
                    app:backgroundTint="@android:color/white" />
         </LinearLayout>
        </RelativeLayout>

  [1]: https://i.stack.imgur.com/b1dAw.png

> Can Anyone Point me out why it is not working
> Any Suggestions will be Helpful
