运行omxplayer"；“永远在最上面”；来自java代码

我有带Raspbian操作系统的Raspberryp2（1GB RAM版本）。我需要执行Omxplayer来播放视频。若我执行新进程，Omxplayer就在后台。我需要Omxplayer始终在顶部。怎么做？Omxplayer并没有像mplayer（-ontop）那样切换到顶部

我找到了（）wmctrl。我尝试运行执行omxplayer的java，然后执行：

ProcessBuilder pb2 = new ProcessBuilder("bash", "-c", "wmctrl -a omxplayer");
Process p2 = pb2.start(); // Start the process.

但不起作用，可能是因为JavaFX使用的是帧缓冲区，而不是X11。资料来源：

我觉得不可能在RaspberryPi上全屏运行Omxplayer

将omxplayer作为新进程运行的代码：

public class OmxPlayer {

    private int xPosition;
    private int yPosition;
    private int width;
    private int height;

    /** Constructor.
     * 
     * */
    OmxPlayer (int xPosition, int yPosition, int width, int height) {
        this.xPosition = xPosition;
        this.yPosition = yPosition;
        this.width = width;
        this.height = height;
     }

    public void play(String url){

        try {
            ProcessBuilder pb = new ProcessBuilder("bash", "-c", "omxplayer -r -o hdmi "+url);
            Process p = pb.start(); // Start the process.

            Log.write("I am playing file: "+url, Log.ENABLE_STDOUT);

            //p.waitFor(); // Wait for the process to finish.

            Log.write("File was played.", Log.ENABLE_STDOUT);
        } catch (Exception e) {
            StringWriter err = new StringWriter();
            e.printStackTrace(new PrintWriter(err));
            Log.write(err.toString(), Log.ENABLE_STDOUT);
        }
    }
}

多谢各位