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camera preview gives gray images

hi, i am developing android app using android sdk camera. on camera preview i need the frame content so i am using PreviewCallback to return the data in byte array, now my problem is saving the data in mat object the mat return gray images:

public void onPreviewFrame(byte[] data, Camera camera) {
    Mat src = new Mat(previewSize.height, previewSize.width, CvType.CV_8U, new Scalar(255));
    src.put(0, 0, data);
    Highgui.imwrite("/mnt/sdcard/1.jpg", src);

anybody can help me to generate argb images

note: i am using NV21 in preview image format.