叠加在ZoomLayout上面的图层不显示

[sunlunchang1994]

        <com.otaliastudios.zoom.ZoomLayout
            android:id="@+id/zoomLayout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scrollbars="vertical|horizontal"
            app:alignment="center"
            app:animationDuration="280"
            app:flingEnabled="true"
            app:hasClickableChildren="false"
            app:horizontalPanEnabled="true"
            app:maxZoom="2.5"
            app:maxZoomType="zoom"
            app:minZoom="0.7"
            app:minZoomType="zoom"
            app:oneFingerScrollEnabled="true"
            app:overPinchable="false"
            app:overScrollHorizontal="false"
            app:overScrollVertical="false"
            app:scrollEnabled="true"
            app:threeFingersScrollEnabled="false"
            app:transformation="none"
            app:transformationGravity="auto"
            app:twoFingersScrollEnabled="false"
            app:verticalPanEnabled="true"
            app:zoomEnabled="true">

            <View
                android:id="@+id/mapView"
                android:layout_width="2123dp"
                android:layout_height="854dp" />
        </com.otaliastudios.zoom.ZoomLayout>

        <android.slc.main_biz.ui.widget.MapLayout
            android:id="@+id/mapLayout"
            android:layerType="software"
            android:background="#01000000"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
        </android.slc.main_biz.ui.widget.MapLayout>
    </FrameLayout>

如图所示 MapLayout onDrawable无法显示