gistfile1.js

<LinearLayout
            android:id="@+id/top_layout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:keepScreenOn="true"
            android:orientation="vertical">

            <team.marker.util.camera.CameraSourcePreview
                android:id="@+id/preview"
                android:layout_width="match_parent"
                android:layout_height="match_parent">

                <team.marker.util.camera.GraphicOverlay
                    android:id="@+id/graphic_overlay"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:forceDarkAllowed="false" />

            </team.marker.util.camera.CameraSourcePreview>

 </LinearLayout>