//这是其中解决预览图的一部分（坑了好久的）
@Overridepublic void onPreviewFrame(byte[] data, Camera camera) {    Size previewSize = camera.getParameters().getPreviewSize();    ByteArrayOutputStream baos = new ByteArrayOutputStream();    byte[] rawImage = null;    // Decode image from the retrieved buffer to JPEG    YuvImage yuv = new YuvImage(data, ImageFormat.NV21, previewSize.width, previewSize.height, null);    yuv.compressToJpeg(new Rect(0, 0, previewSize.width, previewSize.height), YOUR_JPEG_COMPRESSION, baos);    rawImage = baos.toByteArray();    // This is the same image as the preview but in JPEG and not rotated    Bitmap bitmap = BitmapFactory.decodeByteArray(rawImage, 0, rawImage.length);    ByteArrayOutputStream rotatedStream = new ByteArrayOutputStream();    // Rotate the Bitmap    Matrix matrix = new Matrix();    matrix.postRotate(YOUR_DEFAULT_ROTATION);    // We rotate the same Bitmap    bitmap = Bitmap.createBitmap(bitmap, 0, 0, previewSize.width, previewSize.height, matrix, false);    // We dump the rotated Bitmap to the stream     bitmap.compress(CompressFormat.JPEG, YOUR_JPEG_COMPRESSION, rotatedStream);    rawImage = rotatedStream.toByteArray();    // Do something we this byte array}