Android：将SurfaceView z降低1级？

Question

在我们的Android应用程序中，我们有一个扩展SurfaceView的自定义类。该应用程序与无人机交互。并且，在扩展SurfaceView的类中，我们需要在视频/摄像机源上绘制圆圈。麻烦的是，如果我们设置setZOrderOnTop（false）;，您将看不到圆圈。如果setZOrderOnTop（true）;圆圈淹没了所有内容（视图，小部件，按钮，表格布局等），我们希望在圆圈下方绘制圆圈（中间）。调整主XML文件中的顺序绝对没有任何作用。有可能吗？

xml：

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:custom="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/background_blue"
    android:orientation="horizontal"
    tools:context=".MainActivity">

    <dji.ux.widget.FPVWidget
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

    <!--Other Widgets, Buttons, Table Layout, LineatLayouts, RelativeLayout, Etc.-->    

            <dji.crc.com.crc.Views.ArcGISOverlay
            android:id="@+id/arcGISOverlay"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:alpha="0.0"/>

</RelativeLayout>

自定义类：

public class ArcGISOverlay extends SurfaceView {
private SurfaceHolder surfaceHolder;
private final Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
private OverlayThread overlayThread = new OverlayThread(this);
private int x = 500;
private int y = 500;
private static ArcGISService arcGISService;
private boolean firstTimeStart = false;

public ArcGISOverlay(Context context) {
    super(context);
}

public ArcGISOverlay(Context context, AttributeSet attrs){
    super(context, attrs);
    setWillNotDraw(false);
    arcGISService = new ArcGISService();
    init();
}

@Override
protected void onDraw(Canvas canvas){
    if (canvas != null){
        canvas.drawColor(0, PorterDuff.Mode.CLEAR);
        update(canvas);
    }

}

public void init(){
    surfaceHolder = getHolder();
    final ArcGISOverlay arcGISOverlayThread = this;
    surfaceHolder.addCallback(new SurfaceHolder.Callback() {
        @Override
        public void surfaceCreated(SurfaceHolder surfaceHolder) {
            setZOrderOnTop(true);
            surfaceHolder.setFormat(PixelFormat.TRANSPARENT);

            if (!overlayThread.isRunning()){
                overlayThread.setRunning(true);
                overlayThread.start();
            }
        }

        @Override
        public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
        }

        @Override
        public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
            boolean retry = true;
            overlayThread.setRunning(false);

            while (retry){
                try{
                    overlayThread.join();
                    overlayThread = new OverlayThread(arcGISOverlayThread);
                    retry = false;
                }
                catch(InterruptedException e){

                }
            }
        }
    });
}

public void update(Canvas canvas){
    if (surfaceHolder.getSurface().isValid()) {     
        Paint paint = new Paint();
        paint.setColor(Color.WHITE);
        paint.setStyle(Paint.Style.STROKE);
        Random r = new Random();
        for (ArcGISModel model : arcGISService.getViewableData()) {
            //draw random circles until the Geo Locations are in the system
            canvas.drawCircle(r.nextInt(1800 - 100) + 10, r.nextInt(1500 - 100) + 10, 40, paint);
        }
    }
}}