如何将图像转换为字节数组和字节数组到android中的base64字符串？

时间：2012-05-09 10:08:16

标签： android image bytearray

有人能告诉我将图像转换为字节数组并将该字节数组转换为base64字符串的代码。 我写下面的代码没有得到正确的结果。

  String filepath = "/sdcard/Image/ic_launcher.jpg";
   File imagefile = new File(filepath);
        FileInputStream fis = null;
        try {
            fis = new FileInputStream(imagefile);
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        Bitmap bm = BitmapFactory.decodeStream(fis);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();  
        bm.compress(Bitmap.CompressFormat.JPEG, 100 , baos);    
        byte[] b = baos.toByteArray(); 

        String encodedImage = Base64.encodeToString(b, Base64.DEFAULT);

结果我得到了

 [-1, -40, -1, -32, 0, 16, 74, 70, 73, 70, 0, 1, 1, 1, 0, 72, 0, 72, 0, 0, -1, -20, 4, -7, 68, 117, 99, 107, 121, 0, 1, 0, 4, 0, 0, 0, 75, 0, 2, 4, -28, 0, 0, 2, 112, 0, 68, 0, 111, 0, 110, 0, 110, 0, 97, 0, 32, 0, 83, 0, 105, 0, 109, 0, 112, 0, 115, 0, 111, 0, 110, 0, 32, 0, 117, 0, 115, 0, 101, 0, 115, 0, 32, 0, 97, 0, 32, 0, 99, 0, 111, 0, 109, 0, 112, 0, 117, 0, 116, 0, 101, 0, 114, 0, 32, 0, 116, 0, 111, 0, 32, 0, 99, 0, 104, 0, 101, 0, 99, 0, 107, 0, 32, 0, 97, 0, 32, 0, 115, 0, 105, 0, 116, 0, 101, 0, 32, 0, 116, 0, 104, 0, 97, 0, 116, 0, 32, 0, 112, 0, 97, 0, 121, 0, 115, 0, 32, 0, 104, 0, 101, 0, 114, 0, 32, 0, 109, 0, 111, 0, 110, 0, 101, 0, 121, 0, 32, 0, 116, 0, 111, 0, 32, 0, 117, 0, 112, 0, 108, 0, 111, 0, 97, 0, 100, 0, 32, 0, 118, 0, 105, 0, 100, 0, 101, 0, 111, 0, 32, 0, 99, 0, 108, 0, 105, 0, 112, 0, 115, 0, 32, 0, 111, 0, 102, 0, 32, 0, 104, 0, 101, 0, 114, 0, 32, 0, 101, 0, 97, 0, 116, 0, 105, 0, 110, 0, 103, 0, 32, 0, 97, 0, 116, 0, 32, 0, 104, 0, 101, 0, 114, 0, 32, 0, 104, 0, 111, 0, 109, 0, 101, 0, 32, 0, 105, 0, 110, 0, 32, 0, 79, 0, 108, 0, 100, 0, 32, 0, 66, 0, 114, 0, 105, 0, 100, 0, 103, 0, 101, 0, 44, 0, 32, 0, 78, 0, 101, 0, 119, 0, 32, 0, 74, 0, 101, 0, 114, 0, 115, 0, 101, 0, 121, 0, 46, 0, 46, 0, 46, 0, 68, 0, 111, 0, 110, 0, 110, 0, 97, 0, 32, 0, 83, 0, 105, 0, 109, 0, 112, 0, 115, 0, 111, 0, 110, 0, 32, 0, 117, 0, 115, 0, 101, 0, 115, 0, 32, 0, 97, 0, 32, 0, 99, 0, 111, 0, 109, 0, 112, 0, 117, 0, 116, 0, 101, 0, 114, 0, 32, 0, 116, 0, 111, 0, 32, 0, 99, 0, 104, 0, 101, 0, 99, 0, 107, 0, 32, 0, 97, 0, 32, 0, 115, 0, 105, 0, 116, 0, 101, 0, 32, 0, 116, 0, 104, 0, 97, 0, 116, 0, 32, 0, 112, 0, 97, 0, 121, 0, 115, 0, 32, 0, 104, 0, 101, 0, 114, 0, 32, 0, 109, 0, 111, 0, 110, 0, 101, 0, 121, 0, 32, 0, 116, 0, 111, 0, 32, 0, 117, 0, 112, 0, 108, 0, 111, 0, 97, 0, 100, 0, 32, 0, 118, 0, 105, 0, 100, 0, 101, 0, 111, 0, 32, 0, 99, 0, 108, 0, 105, 0, 112, 0, 115, 0, 32, 0, 111, 0, 102, 0, 32, 0, 104, 0, 101, 0, 114, 0, 32, 0, 101, 0, 97, 0, 116, 0, 105, 0, 110, 0, 103, 0, 32, 0, 97, 0, 116, 0, 32, 0, 104, 0, 101, 0, 114, 0, 32, 0, 104, 0, 111, 0, 109, 0, 101, 0, 32, 0, 105, 0, 110, 0, 32, 0, 79, 0, 108, 0, 100, 0, 32, 0, 66, 0, 114, 0, 105, 0, 100, 0, 103, 0, 101, 0, 44, 0, 32, 0, 78, 0, 101, 0, 119, 0, 32, 0, 74, 0, 101, 0, 114, 0, 115, 0, 101, 0, 121, 0, 32, 0, 74, 0, 117, 0, 110, 0, 101, 0, 32, 0, 56, 0, 44, 0, 32, 0, 50, 0, 48, 0, 49, 0, 48, 0, 46, 0, 32, 0, 83, 0, 105, 0, 109, 0, 112, 0, 115, 0, 111, 0, 110, 0, 44, 0, 32, 0, 52, 0, 50, 0, 44, 0, 32, 0, 119, 0, 104, 0, 111, 0, 32, 0, 119, 0, 101, 0, 105, 0, 103, 0, 104, 0, 115, 0, 32, 0, 109, 0, 111, 0, 114, 0, 101, 0, 32, 0, 116, 0, 104, 0, 97, 0, 110, 0, 32, 0, 54, 0, 48, 0, 48, 0, 32, 0, 112, 0, 111, 0, 117, 0, 110, 0, 100, 0, 115, 0, 32, 0, 40, 0, 50, 0, 55, 0, 50, 0, 32, 0, 107, 0, 103, 0, 41, 0, 32, 0, 97, 0, 110, 0, 100, 0, 32, 0, 97, 0, 105, 0, 109, 0, 115, 0, 32, 0, 116, 0, 111, 0, 32, 0, 114, 0, 101, 0, 97, 0, 99, 0, 104, 0, 32, 0, 49, 0, 44, 0, 48, 0, 48, 0, 48, 0, 32, 0, 112, 0, 111, 0, 117, 0, 110, 0, 100, 0, 115, 0, 32, 0, 40, 0, 52, 0, 53, 0, 53, 0, 32, 0, 107, 0, 103, 0, 41, 0, 44, 0, 32, 0, 105, 0, 115, 0, 32, 0, 119, 0, 97, 0, 103, 0, 105, 0, 110, 0, 103, 0, 32, 0, 97, 0, 32, 0, 99, 0, 97, 0, 109, 0, 112, 0, 97, 0, 105, 0, 103, 0, 110, 0, 32, 0, 116, 0, 111, 0, 32, 0, 98, 0, 101, 0, 99, 0, 111, 0, 109, 0, 101, 0, 32, 0, 116, 0, 104, 0, 101, 0, 32, 0, 119, 0, 111, 0, 114, 0, 108, 0, 100, 0, 39, 0, 115, 0, 32, 0, 104, 0, 101, 0, 97, 0, 118, 0, 105, 0, 101, 0, 115, 0, 116, 0, 32, 0, 108, 0, 105, 0, 118, 0, 105, 0, 110, 0, 103, 0, 32, 0, 119, 0, 111, 0, 109, 0, 97, 0, 110, 0, 44, 0, 32, 0, 97, 0, 100, 0, 109, 0, 105, 0, 116, 0, 116, 0, 105, 0, 110, 0, 103, 0, 32, 0, 116, 0, 104, 0, 97, 0, 116, 0, 32, 0, 115, 0, 104, 0, 101, 0, 32, 0, 105, 0, 115, 0, 32, 0, 97, 0, 115, 0, 32, 0, 104, 0, 117, 0, 110, 0, 103, 0, 114, 0, 121, 0, 32, 0, 102, 0, 111, 0, 114, 0, 32, 0, 97, 0, 116, 0, 116, 0, 101, 0, 110, 0, 116, 0, 105, 0, 111, 0, 110, 0, 32, 0, 97, 0, 115, 0, 32, 0, 115, 0, 104, 0, 101, 0, 32, 0, 105, 0, 115, 0, 32, 0, 102, 0, 111, 0, 114, 0, 32, 0, 99, 0, 97, 0, 108, 0, 111, 0, 114, 0, 105, 0, 101, 0, 45, 0, 114, 0, 105, 0, 99, 0, 104, 0, 32, 0, 102, 0, 111, 0, 111, 0, 100, 0, 46, 0, 32, 0, 80, 0, 105, 0, 99, 0, 116, 0, 117, 0, 114, 0, 101, 0, 32, 0, 116, 0, 97, 0, 107, 0, 101, 0, 110, 0, 32, 0, 74, 0, 117, 0, 110, 0, 101, 0, 32, 0, 56, 0, 44, 0, 32, 0, 50, 0, 48, 0, 49, 0, 48, 0, 46, 0, 32, 0, 82, 0, 69, 0, 85, 0, 84, 0, 69, 0, 82, 0, 83, 0, 47, 0, 76, 0, 117, 0, 99, 0, 97, 0, 115, 0, 32, 0, 74, 0, 97, 0, 99, 0, 107, 0, 115, 0, 111, 0, 110, 0, 32, 0, 40, 0, 85, 0, 78, 0, 73, 0, 84, 0, 69, 0, 68, 0, 32, 0, 83, 0, 84, 0, 65, 0, 84, 0, 69, 0, 83, 0, 32, 0, 45, 0, 32, 0, 84, 0, 97, 0, 103, 0, 115, 0, 58, 0, 32, 0, 72, 0, 69, 0, 65, 0, 76, 0, 84, 0, 72, 0, 32, 0, 83, 0, 79, 0, 67, 0, 73, 0, 69, 0, 84, 0, 89, 0, 41, 0, 0, -1, -37, 0, 67, 0, 8, 6, 6, 7, 6, 5, 8, 7, 7, 7, 9, 9, 8, 10, 12, 20, 13, 12, 11, 11, 12, 25, 18, 19, 15, 20, 29, 26, 31, 30, 29, 26, 28, 28, 32, 36, 46, 39, 32, 34, 44, 35, 28, 28, 40, 55, 41, 44, 48, 49, 52, 52, 52, 31, 39, 57, 61, 56, 50, 60, 46, 51, 52, 50, -1, -37, 0, 67, 1, 9, 9, 9, 12, 11, 12, 24, 13, 13, 24, 50, 33, 28, 33, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, 50, -1, -64, 0, 17, 8, 1, 32, 1, -52, 3, 1, 34, 0, 2, 17, 1, 3, 17, 1, -1, -60, 0, 28, 0, 0, 0, 7, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, -1, -60, 0, 76, 16, 0, 1, 3, 2, 4, 3, 6, 3, 5, 4, 8, 4, 5, 2, 7, 0, 1, 2, 3, 17, 0, 4, 5, 18, 33, 49, 6, 65, 81, 19, 34, 97, 113, -127, -111, 20, 50, -95, 7, 66, -79, -63, -16, 21, 35, 82, -47, 36, 51, 98, 114, -126, -94, -31, -15, 22, 83, -62, -46, 37, 99, -110, -109, -78, 8, 115, 52, 53, 68, 85, 100, -77, -30, -1, -60, 0, 26, 1, 0, 3, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, -1, -60, 0, 45, 17, 0, 2, 2, 2, 2, 2, 1, 3, 3, 3, 5, 1, 0, 0, 0, 0, 0, 1, 2, 17, 3, 33, 18, 49, 4, 65, 81, 19, 34, 97, 113, -79, -16, 20, -111, -47, 5, 35, 50, 66, -95, -31, -1, -38, 0, 12, 3, 1, 0, 2, 17, 3, 17, 0, 63, 0, -21, -96, -17, 64, -11, -92, -125, 74, -98, -75, -56, 116, 7, -17, 71, -52, -46, 65, -97, 10, 85, 0, 40, 80, -102, 33, 52, 40, 1, 92, -7, 82, 78, -44, 13, 36, -21, 64, 7, 67, -42, -109, 71, 64, 7, -46, -114, -109, -45, 106, 51, 64, 2, -116, -47, 80, 39, 77, 77, 0, 42, -118, -123, 9, -96, 3, -94, -10, -95, -25, 68, 117, -38, -104, 7, 66, -118, 104, 82, 0, 80, -95, -27, 69, 76, 0, 104, -89, -91, 3, 69, 64, 7, -67, 23, -67, 9, -94, -25, 64, 3, -34, -116, -111, 73, 49, 52, 9, 20, 0, 40, -113, -42, -118, -121, -122, -76, -64, 26, -46, 105, 81, 69, 20, -128, 17, -54, -123, 8, -93, -118, 64, 20, 82, -94, -124, 82, -128, -96, 4, -88, 119, 23, -24, 40, -109, 78, 44, 119, 21, 61, 69, 36, 10, 98, 22, -102, 113, 59, 82, 6, -44, -32, -90, -124, 56, 41, 66, -110, 41, 66, -87, 0, -79, 71, 69, 70, 61, 106, -47, 33, -51, 28, -47, 80, -96, 66, -88, -26, -109, 64, 26, 0, 57, -42, -114, 105, 51, 66, 105, 5, 11, -102, 20, -112, 124, 69, 29, 0, 42, -118, 104, 10, 28, -88, 0, 81, 107, 71, 66, -99, 0, 40, 81, 80, -102, 64, 84, -125, -46, -107, 34, -112, 15, -123, 43, 88, -48, 86, 38, -95, -119, -91, -45, 114, 121, -46, -3, -88, 0, -63, -93, -102, 42, 20, 0, 9, -92, -88, -47, -103, -92, 19, -50, -128, 20, 40, 77, 36, 31, 42, 19, -42, -128, 21, 52, 116, -119, -93, -15, -96, 5, 80, 59, 122, -47, 10, 7, 97, -74, -30, -128, 21, 52, 38, -109, 71, 64, 7, 66, -110, 77, 28, -48, 1, -48, -102, 76, -48, -96, 3, -102, 34, 104, 81, 19, 64, 2, -123, 10, 34, 69, 48, 4, -47, 19, 66, -128, -96, 2, 62, -76, -103, -91, 30, -76, -104, -90, 0, 20, 98, -120, 80, 19, 72, 5, 77, 39, -54, -124, -51, 21, 0, 44, 80, -46, -117, 125, -23, 67, 90, 64, 24, 20, -80, 5, 36, 68, -46, -58, -76, -60, 18, -57, 113, 95, -34, 20, -108, -118, 91, -122, 19, 29, 85, -7, 82, 69, 0, 44, 82, -59, 32, 82, -59, 52, 38, 44, 82, -123, 32, 82, -22, -48, -123, 81, -118, 64, -91, 77, 82, 1, 84, 116, 83, 66, -104, -125, -25, 67, -107, 21, 0, 117, -92, 1, -125, 66, 104, -124, -64, -95, 53, 32, 40, 116, -93, -92, -47, -118, 96, 42, 69, 9, -94, -95, 62, 84, 8, 30, -15, -46, -114, -118, 104, 72, -102, 96, 15, 57, -94, -34, -124, -47, 122, -48, 5, 35, 119, -115, 56, -128, -76, 25, 73, -25, 75, 23, 41, -102, -95, -78, 37, 41, 82, 12, 127, 16, -4, -22, 88, -41, 104, -84, 104, -44, -79, 114, -19, 73, 0, 54, -62, -100, 81, -97, -68, 18, 7, -103, -2, 64, -46, 62, 42, -20, 110, -59, -78, -68, 3, -85, 7, -36, -93, -14, -88, 15, 57, -39, 50, -73, 114, 41, 121, 6, 108, -88, 65, 82, -107, -32, 0, -44, -97, 42, -120, -116, 102, -43, 87, 1, -91, 118, -19, 44, -126, 66, 87, 106, -24, 49, -44, -9, 96, 122, -47, 64, -109, 52, 45, 92, -123, -50, 102, -36, 105, 67, 112, -79, -89, -95, 26, 31, -44, -45, -95, -44, -98, -66, -43, 66, 47, -112, -30, 101, -112, -91, 13, -91, 64, -89, -24, 105, 11, 122, -31, 99, -25, 41, 7, -110, 52, -94, -128, -48, 41, 99, -81, -91, 37, 74, 51, 89, -26, -46, -92, -72, 12, -86, 100, 107, 52, -1, 0, 15, 37, 45, 96, -84, -74, -128, 18, -128, -91, -108, -92, 108, 37, 68, -97, -87, 38, -114, -128, -71, -111, 66, 105, -68, -38, 81, -51, 32, 28, -109, 67, 53, 34, 122, -5, 81, -125, 64, 14, 77, 2, 118, -13, 20, -119, -91, 125, -47, -3, -31, 52, 0, -70, 42, 41, 52, 38, -128, 12, -102, 20, -109, 66, -104, 10, -96, 77, 36, -102, 18, 104, 1, 83, 68, 72, -25, 73, -102, 19, 64, 7, 52, 71, 78, -108, 38, -123, 0, 20, -7, -47, -47, 81, -19, 69, -128, 41, 42, -93, -92, -109, -19, 64, 21, 92, 65, -60, -104, 95, 12, -39, 11, -84, 73, -41, 6, 109, 27, 101, -122, -13, -72, -28, 111, 3, 64, 7, -119, 32, 120, -51, 115, 59, -1, 0, -74, -53, -27, -87, 67, 9, -64, -20, -38, 108, 24, 11, -67, 121, 110, -85, -52, -124, 101, 3, -36, -7, -42, -17, -120, -101, -73, -65, -62, -18, 123, 118, -112, -76, 40, 110, -95, 48, 6, -43, -61, 113, -101, 70, -84, -18, 22, -106, -13, -72, -127, -79, 73, 76, 15, 45, -87, -82, -10...

and at end of this byte array im getting this 3 dots and array is not completed ,so how can i get correct byte array

base64字符串是
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xjc/9/Zn95v3q26fz83s0Yz5fy7tyQfxZ3/8g/n78n9/p+837+s3nf6ZnqN32X5bR9xReT/rP9R8
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v/5B/P35P7/T95v39ZvO/wBMIxny/l3bkg/izv8A+Qfz9+T+/wBP3m/f1m87/TBJ92zI3eY0Of8A
prN/ofP3nwR5hwPmjk8xeZ/OP2un1j69NftU9uW21rf3nGHwyi0Lu/Lp/hlvKP8ASvJ3TV5Y+dn8
W/yG6/63/jz/AHv3pMY8z/V/vPM83/lv5n+mV052cW7Z8rqfv5+x/N958Z8zlPm3+b9y48z/AEwX
kobhQxkEe49TLk2Q+ZQ0pHErEgbzJvCkzm4JvIJMXWzyFDhhFlc/6wZsjjLM4QgEj/lpu8x+Jmmz
edN/z031132fRp6662s3zcx3+VtHrf7+601etnf3nK1GM+X8u7ckH8Wd/wDyD+fvyf3+n7zfv6ze
d/phGM+X8u7ckH8Wd/8AyD+fvyf3+n7zfv6zed/pldJfu/Lu4hA6/vD/AKJ8v+skwfl4b94JPNX5
ZfOP2wT5tv8AHv8AJTn/AJbf8en7k8ybQvmcSfvPM80cz+b/AKZyt3v537dee2nK3tOL6721k1zC
81tbounLfeH91999brmbYvOzvny/fOfsf/XTdu8z/ppu8z/lt53+mC87O+fL985+x/8AXTdu8z/p
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5 个答案:

答案 0 :(得分：79)

试试这个：

// convert from bitmap to byte array
public byte[] getBytesFromBitmap(Bitmap bitmap) {
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    bitmap.compress(CompressFormat.JPEG, 70, stream);
    return stream.toByteArray();
}

// get the base 64 string
String imgString = Base64.encodeToString(getBytesFromBitmap(someImg), 
                       Base64.NO_WRAP);

答案 1 :(得分：11)

我编写了以下代码，将图像从sdcard转换为Base64编码的字符串，作为JSON对象发送。它运行良好：

String filepath = "/sdcard/temp.png";
File imagefile = new File(filepath);
FileInputStream fis = null;
try {
    fis = new FileInputStream(imagefile);
    } catch (FileNotFoundException e) {
    e.printStackTrace();
}

Bitmap bm = BitmapFactory.decodeStream(fis);
ByteArrayOutputStream baos = new ByteArrayOutputStream();  
bm.compress(Bitmap.CompressFormat.JPEG, 100 , baos);    
byte[] b = baos.toByteArray(); 
encImage = Base64.encodeToString(b, Base64.DEFAULT);

答案 2 :(得分：1)

他们已经包装了大部分需要解决问题的东西，其中一个tests看起来像这样：

String filename = CSSURLEmbedderTest.class.getResource("folder.png").getPath().replace("%20", " ");
String code = "background: url(folder.png);";

StringWriter writer = new StringWriter();
embedder = new CSSURLEmbedder(new StringReader(code), true);
embedder.embedImages(writer, filename.substring(0, filename.lastIndexOf("/")+1));

String result = writer.toString();
assertEquals("background: url(" + folderDataURI + ");", result);

答案 3 :(得分：1)

这是另一种解决方案...... 

System.IO.Stream st = new System.IO.StreamReader (picturePath).BaseStream;
byte[] buffer = new byte[4096];

System.IO.MemoryStream m = new System.IO.MemoryStream ();
while (st.Read (buffer,0,buffer.Length) > 0) {
    m.Write (buffer, 0, buffer.Length);
}  
imgView.Tag = m.ToArray ();
st.Close ();
m.Close ();
希望它有所帮助！

答案 4 :(得分：0)

尝试这个简单的解决方案将文件转换为base64字符串

String base64String = imageFileToByte(file);

public String imageFileToByte(File file){

    Bitmap bm = BitmapFactory.decodeFile(file.getAbsolutePath());
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    bm.compress(Bitmap.CompressFormat.JPEG, 100, baos); //bm is the bitmap object
    byte[] b = baos.toByteArray();
    return Base64.encodeToString(b, Base64.DEFAULT);
}
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