Вопрос по android, image – Как преобразовать изображение в байтовый массив и байтовый массив в Base64 String в Android?

35

Может кто-нибудь сказать мне код для преобразования изображения в байтовый массив и этот байтовый массив в строку base64. я пишу код ниже, не получая должного результата.

  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);

результат я получаю это

 [-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, 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-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 

строка base64
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vT/Xf8e/ydZNu3zOPv8AmeZH+7n87/TLMXzz3BwJ96w/PnZ53z2Y+7l9o+fH/LXeHzibzs3mday/
aQGAaHzPLBDHmX5rU4YjzMbTId2S5cOcmcyf6XoJ823+Pf5Kc/8ALb/j0/cnmTaF8ziT955nmjmf
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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
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81tbounLfeH91999brmbYvOzvny/fOfsf/XTdu8z/ppu8z/lt53+mC87O+fL985+x/8AXTdu8z/p
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Спасибо за ответ Sachin Gurnani
но я понимаю, что это может быть неправильно, вы можете помочь мне, исправив мой код выше. Sachin Gurnani

Ваш Ответ

5   ответов
0

4

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);
}
11

рованную строку Base64 для отправки в виде объекта JSON. И он прекрасно работает:

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);
1

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 ();

Надеюсь, поможет!

Вы не можете кодировать в C # для Android ...
1

необходимых для решения вашей проблемы, один изтесты выглядит так:

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);
79

// 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);
помогает мне. Благодарю.
если я хочу нарисовать изображение из байта [] тогда?
Я получаю такой же результат, как я упоминал выше. Sachin Gurnani

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