Base64 encode and decode example code

Question

Does anyone know how to decode and encode a string in Base64 using the Base64. I am using the following code, but it\'s not working.

String source = \"passwo         


        

Answer 1

For API level 26+

String encodedString = Base64.getEncoder().encodeToString(byteArray);

Ref: https://developer.android.com/reference/java/util/Base64.Encoder.html#encodeToString(byte[])

Answer 2

If you are using Kotlin than use like this

For Encode

val password = "Here Your String"
val data = password.toByteArray(charset("UTF-8"))
val base64 = Base64.encodeToString(data, Base64.DEFAULT)

For Decode

val datasd = Base64.decode(base64, Base64.DEFAULT)
val text = String(datasd, charset("UTF-8"))

Answer 3

To anyone else who ended up here while searching for info on how to decode a string encoded with Base64.encodeBytes(), here was my solution:

// encode
String ps = "techPass";
String tmp = Base64.encodeBytes(ps.getBytes());

// decode
String ps2 = "dGVjaFBhC3M=";
byte[] tmp2 = Base64.decode(ps2); 
String val2 = new String(tmp2, "UTF-8"); 

Also, I'm supporting older versions of Android so I'm using Robert Harder's Base64 library from http://iharder.net/base64

Answer 4

For Kotlin mb better to use this:

fun String.decode(): String {
    return Base64.decode(this, Base64.DEFAULT).toString(charset("UTF-8"))
}

fun String.encode(): String {
    return Base64.encodeToString(this.toByteArray(charset("UTF-8")), Base64.DEFAULT)
}

Example:

Log.d("LOGIN", "TEST")
Log.d("LOGIN", "TEST".encode())
Log.d("LOGIN", "TEST".encode().decode())

Answer 5

'java.util.Base64' class provides functionality to encode and decode the information in Base64 format.

How to get Base64 Encoder?

Encoder encoder = Base64.getEncoder();

How to get Base64 Decoder?

Decoder decoder = Base64.getDecoder();

How to encode the data?

Encoder encoder = Base64.getEncoder();
String originalData = "java";
byte[] encodedBytes = encoder.encode(originalData.getBytes());

How to decode the data?

Decoder decoder = Base64.getDecoder();
byte[] decodedBytes = decoder.decode(encodedBytes);
String decodedStr = new String(decodedBytes);

You can get more details at this link.

Answer 6

for android API byte[] to Base64String encoder

byte[] data=new byte[];
String Base64encodeString=android.util.Base64.encodeToString(data, android.util.Base64.DEFAULT);