Androidで画像をバイト配列に変換し、バイト配列をbase64文字列に変換する方法は？
画像をバイト配列に変換し、そのバイト配列をbase64文字列に変換するコードを教えてください。適切な結果が得られない以下のコードを書きます。
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);
得られた結果は
[-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
base64文字列は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vT/Xf8e/ydZNu3zOPv8AmeZH+7n87/TLMXzz3BwJ96w/PnZ53z2Y+7l9o+fH/LXeHzibzs3mday/
aQGAaHzPLBDHmX5rU4YjzMbTId2S5cOcmcyf6XoJ823+Pf5Kc/8ALb/j0/cnmTaF8ziT955nmjmf
zf8ATJXf+601r9rmXz1jF2s01JbzVOLqOi125k1urpW195dVFPtqtZQVy9bcqo67kibZnO/Edl+8
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pAc53qDZAY+Zj8iv8x/eiXzCpFw0ga7Ixny/l3bkg/izv/5B/P35P7/T95v39ZvO/wBMvo3br1S7
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k6+Z9795v87rP5v+mz1t/n/NGL3Te8pbrylebrQb11t+TfRtbJ9lt8rpQLSc/Zj97LxjP97/AI81
xjc/9/Zn95v3q26fz83s0Yz5fy7tyQfxZ3/8g/n78n9/p+837+s3nf6ZnqN32X5bR9xReT/rP9R8
mMy4A39cSeYGdsT+f5t5PIuVj+TduSIZ3583MdqNpG6XGfMxn95v87rN5v8AprStGT35p227rlvr
Ft/FfVv1bd2LXm02gnay1tJP+TrbdRe/XVNU+bb/AB7/ACU5/wCW3/Hp+5PMm0L5nEn7zzPNHM/m
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jmfzf9MJJi0OZZ9+8AsCQA/FjldpeQKP3rFW+cN5h/14uCbwSvfrt2u1eSe6d73v8VndXU3Jzmd/
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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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これを試して：
// 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);
次のコードを記述して、sdcardからBase64エンコード文字列に画像を変換し、JSONオブジェクトとして送信します。
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);
彼らはあなたの問題を解決するために必要なほとんどのものを包みました、 tests の1つはこのように見えます：
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);
ここに別の解決策があります...
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 ();
それが役に立てば幸い！
ファイルをbase64文字列に変換するには、この簡単なソリューションを試してください
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);
}