如何在android中将图像转换为字节数组和字节数组为base64字符串？
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时间：2020-08-20 04:00:56 来源:igfitidea点击:
How to convert image into byte array and byte array to base64 String in android?
提问by Sachin Gurnani
Can someone tell me the code to convert image into byte array and that byte array into base64 string. i write the below code not getting proper result .
有人可以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。我写了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);
result im getting is
我得到的结果是
[-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, 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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 string is
base64 字符串是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vT/Xf8e/ydZNu3zOPv8AmeZH+7n87/TLMXzz3BwJ96w/PnZ53z2Y+7l9o+fH/LXeHzibzs3mday/
aQGAaHzPLBDHmX5rU4YjzMbTId2S5cOcmcyf6XoJ823+Pf5Kc/8ALb/j0/cnmTaF8ziT955nmjmf
zf8ATJXf+601r9rmXz1jF2s01JbzVOLqOi125k1urpW195dVFPtqtZQVy9bcqo67kibZnO/Edl+8
3bpOE8zlMyeb5g/1/m/6W5Jd235d28Qt1Hzk/Zvn/wBbLtx9oH7v98JNw+ebzv8ATK9uJsIuNyuI
pAc53qDZAY+Zj8iv8x/eiXzCpFw0ga7Ixny/l3bkg/izv/5B/P35P7/T95v39ZvO/wBMvo3br1S7
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/wD0zObm124zvjgOzOfO5s13bt0m0fvNm3955hl3fv8AzM3hJyY/4/NEfOeLnLWPON0nlhvM6fPu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回答by Dhruv Gairola
Try this:
尝试这个：
// 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);
回答by Priyank Desai
I wrote the following code to convert an image from sdcard to a Base64 encoded string to send as a JSON object.And it works great:
我编写了以下代码将图像从 sdcard 转换为 Base64 编码的字符串以作为 JSON 对象发送。它工作得很好：
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);
回答by user3219253
here is another solution...
这是另一个解决方案......
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 ();
hope it helps!
希望能帮助到你！
回答by Daniel Magnusson
They have wrapped most stuff need to solve your problem, one of the testslooks like this:
他们已经包装了解决您的问题所需的大部分内容，其中一项测试如下所示：
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);
回答by Vigneswaran A
Try this simple solution to convert file to base64 string
试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);
}
