bitmap转成字节流



public InputStream bitmapToInputStream(Bitmap myBitmap) {
  ByteArrayOutputStream baos = new ByteArrayOutputStream();
  myBitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
  ByteArrayInputStream byteArrInputStream = new ByteArrayInputStream(
    baos.toByteArray());

  return byteArrInputStream;
 }