activity_manager.xml

<?xml version="1.0" encoding="utf-8"?>
<layout>

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <FrameLayout
            android:id="@+id/fl_content"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical" />

        <ImageView
            android:id="@+id/msg"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_alignParentRight="true"
            android:layout_marginBottom="150dp"
            android:layout_marginRight="15dp"
            android:src="@mipmap/icon_news"
            android:visibility="visible" />
    </RelativeLayout>
</layout>