Android相机 - 设置引起运行时异常的焦点区域

我正在尝试开发自动聚焦在相机框架中间的大对象的代码.这是我的代码:

        Log.i (TAG, "Picking supported size " + selected.width + "x" + selected.height);
        parameters.setPictureSize (selected.width, selected.height);
        try
        {
            parameters.setFocusAreas (Arrays.asList (
                new Camera.Area (
                    new Rect(selected.width/3, selected.height/3, (selected.width*2)/3, (selected.height*2)/3), 
                    1)
                ));
        }
        catch (Exception e)
        {
            Log.w (TAG, "Set focus area failed", e);
        }
        catch (NoClassDefFoundError e)
        {
            Log.w (TAG, "Set focus area failed", e);                
        }
        camera.setParameters (parameters);

三星Galaxy S2与CM9的结果是:

I/ImageCaptureActivity(28885): Picking supported size 2048x1232
E/ISecCameraHardware(1874): android::status_t android::ISecCameraHardware::checkArea(ssize_t, ssize_t, ssize_t, ssize_t, ssize_t): Camera area right coordinate is invalid 1365
E/ISecCameraHardware(1874): android::status_t android::ISecCameraHardware::setFocusAreas(const android::CameraParameters&): FocusArea parsing failed
W/dalvikvm(28885): threadid=1: thread exiting with uncaught exception (group=0x40a641f8)
E/AndroidRuntime(28885): FATAL EXCEPTION: main
E/AndroidRuntime(28885): java.lang.RuntimeException: setParameters failed
E/AndroidRuntime(28885):    at android.hardware.Camera.native_setParameters(Native Method)
E/AndroidRuntime(28885):    at android.hardware.Camera.setParameters(Camera.java:1423)
E/AndroidRuntime(28885):    at net.meridiandigital.autophoto.ImageCaptureActivity$1.run(ImageCaptureActivity.java:67)

知道为什么这段代码不起作用？产生的右手坐标(1365)完全在图像宽度(2048)内,那么为什么系统会反对呢？