如何将JPG文件转换为二进制字符串?[副本]

您可以使用Base64 Android类:

String encodedImage = Base64.encodeToString(byteArrayImage, Base64.DEFAULT);
Bitmap bm = BitmapFactory.decodeFile("/path/to/image.jpg");
ByteArrayOutputStream baos = new ByteArrayOutputStream();  
bm.compress(Bitmap.CompressFormat.JPEG, 100, baos); //bm is the bitmap object   
byte[] b = baos.toByteArray();