Android - For showing a full screen image for something like a detail photo view of photo in a gallery

layout_fullscreen_image.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/image_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scaleType="fitXY"
        android:adjustViewBounds="true"
        android:layout_gravity="center"/>

    <TextView
        android:id="@+id/loading_text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="Loading..."
        android:textColor="@color/gray"/>

</FrameLayout>