Android usbCamera 拿到YUYV数据转为BMP

//点击事件
public void onClickPhoto(View v) {
        int[] rgb = new int[Cmd.w_h*3];
        Bitmap bitmap = YUV2RGBABitmap2(Cmd.bufferlocal,rgb, 480, 640);
        saveImage(bitmap);
    }
//此方法为yuyv数据 ，提取Y分量，只要黑白元素，转为BMP图片
static public Bitmap YUV2RGBABitmap2(byte[] yuv, int[] rgb , int width, int height) {

        int y = 0;

        for (int i = 0; i < height; i++) {
            for (int j = 0; j < width; j++) {
                int dex = (i * width + j)*2;
                    y = 0xff & yuv[dex];
                    rgb[i*width + j] = 0xff000000| y << 16 | y << 8 | y;
            }
        }

        Bitmap bmp = Bitmap.createBitmap(rgb,width, height, Bitmap.Config.ARGB_8888);

            return bmp;
        }
public String saveImage(Bitmap bmp) {

        File appDir = new File(Environment.getExternalStorageDirectory(), "a");
        if (!appDir.exists()) {
            appDir.mkdir();
        }
        String fileName = System.currentTimeMillis() + ".bmp";
        File file = new File(appDir, fileName);

        try {
            FileOutputStream fos = new FileOutputStream(file);
//            fos.write(bmp);
//            writeBytesToFile(Cmd.bufferlocal,Cmd.bufferlocal.length,fos);
            bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            fos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return file.getAbsolutePath();
    }