创建自己的Base64类并使用它：
public class Base64
{
private Base64()
{
super();
}
/**
* Encode some data and return a String.
*/
public final static String encode(byte[] d)
{
if (d == null) return null;
byte data[] = new byte[d.length+2];
System.arraycopy(d, 0, data, 0, d.length);
byte dest[] = new byte[(data.length/3)*4];
// 3-byte to 4-byte conversion
for (int sidx = 0, didx=0; sidx < d.length; sidx += 3, didx += 4)
{
dest[didx] = (byte) ((data[sidx] >>> 2) & 077);
dest[didx+1] = (byte) ((data[sidx+1] >>> 4) & 017 |
(data[sidx] << 4) & 077);
dest[didx+2] = (byte) ((data[sidx+2] >>> 6) & 003 |
(data[sidx+1] << 2) & 077);
dest[didx+3] = (byte) (data[sidx+2] & 077);
}
// 0-63 to ascii printable conversion
for (int idx = 0; idx <dest.length; idx++)
{
if (dest[idx] < 26) dest[idx] = (byte)(dest[idx] + 'A');
else if (dest[idx] < 52) dest[idx] = (byte)(dest[idx] + 'a' - 26);
else if (dest[idx] < 62) dest[idx] = (byte)(dest[idx] + '0' - 52);
else if (dest[idx] < 63) dest[idx] = (byte)'+';
else dest[idx] = (byte)'/';
}
// add padding
for (int idx = dest.length-1; idx > (d.length*4)/3; idx--)
{
dest[idx] = (byte)'=';
}
return new String(dest);
}
/**
* Encode a String using Base64 using the default platform encoding
**/
public final static String encode(String s) {
return encode(s.getBytes());
}
/**
* Decode data and return bytes.
*/
public final static byte[] decode(String str)
{
if (str == null) return null;
byte data[] = str.getBytes();
return decode(data);
}
/**
* Decode data and return bytes. Assumes that the data passed
* in is ASCII text.
*/
public final static byte[] decode(byte[] data)
{
int tail = data.length;
while (data[tail-1] == '=') tail--;
byte dest[] = new byte[tail - data.length/4];
// ascii printable to 0-63 conversion
for (int idx = 0; idx <data.length; idx++)
{
if (data[idx] == '=') data[idx] = 0;
else if (data[idx] == '/') data[idx] = 63;
else if (data[idx] == '+') data[idx] = 62;
else if (data[idx] >= '0' && data[idx] <= '9')
data[idx] = (byte)(data[idx] - ('0' - 52));
else if (data[idx] >= 'a' && data[idx] <= 'z')
data[idx] = (byte)(data[idx] - ('a' - 26));
else if (data[idx] >= 'A' && data[idx] <= 'Z')
data[idx] = (byte)(data[idx] - 'A');
}
// 4-byte to 3-byte conversion
int sidx, didx;
for (sidx = 0, didx=0; didx < dest.length-2; sidx += 4, didx += 3)
{
dest[didx] = (byte) ( ((data[sidx] << 2) & 255) |
((data[sidx+1] >>> 4) & 3) );
dest[didx+1] = (byte) ( ((data[sidx+1] << 4) & 255) |
((data[sidx+2] >>> 2) & 017) );
dest[didx+2] = (byte) ( ((data[sidx+2] << 6) & 255) |
(data[sidx+3] & 077) );
}
if (didx < dest.length)
{
dest[didx] = (byte) ( ((data[sidx] << 2) & 255) |
((data[sidx+1] >>> 4) & 3) );
}
if (++didx < dest.length)
{
dest[didx] = (byte) ( ((data[sidx+1] << 4) & 255) |
((data[sidx+2] >>> 2) & 017) );
}
return dest;
}
/**
* A simple test that encodes and decodes the first commandline argument.
*/
public static final void main(String[] args)
{
if (args.length != 1)
{
System.out.println("Usage: Base64 string");
System.exit(0);
}
try
{
String e = Base64.encode(args[0].getBytes());
String d = new String(Base64.decode(e));
System.out.println("Input = '" + args[0] + "'");
System.out.println("Encoded = '" + e + "'");
System.out.println("Decoded = '" + d + "'");
}
catch (Exception x)
{
x.printStackTrace();
}
}
}
首先通过以下代码将您的位图转换为 byteArray：
ByteArrayOutputStream baos = new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.PNG, 100, baos);
byte[] b = baos.toByteArray();
要使用此调用传递位图图像的字节 []：
base64Image = Base64.encode(b));
您可以通过在浏览器中点击以下行来检查它，您将看到图像。
data:image/jpeg;base64,base64Image
