从Codename one访问Android路径?

FileSystemStorage.getInstance().exists(file) 它总是返回false,即使我刚刚从本机代码返回了路径

我的代码返回如下路径:

String path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getAbsolutePath() +"/"+param+System.currentTimeMillis()+".png";

有什么建议吗

----------------更新:

final StatusClass imagePath = new StatusClass();    
Display.getInstance().invokeAndBlock(new Runnable() {
                public void run() {
                    Log.p("hello native");
                    imagePath.setStatusMsg(AccessNativeCamera.capturePhoto("Test"));

                Log.p("goodbye native");
                Log.p("imagePath "+imagePath);
            }
        });

        if(FileSystemStorage.getInstance().exists("file://" + imagePath.getStatusMsg())){
            Dialog.show("Check ","File exists", null, null);
        }

当做,