我有RaspberryPi2（1GB RAM版本）和Raspbian OS。我需要执行Omxplayer播放视频。如果我执行新进程，Omxplayer就在后台。我总是需要Omxplayer。怎么做？ Omxplayer没有切换到保持在顶部，例如mplayer（-ontop）。
我找到了（https://askubuntu.com/questions/7377/how-to-start-an-app-with-always-on-top-set）wmctrl。我尝试运行执行omxplayer的java并在执行后执行：
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framebuffer，而不是使用X11。资料来源：Why does my JavaFx application not have a frame when run on my RaspberryPi?
我觉得在RaspberryPi上全屏运行Omxplayer是不可能的。
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);
}
}
}
谢谢。