Base 64 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    password    byte   byteArray   source getBytes  UTF-16     Base64 bs   new Base64       bs encodeBytes byteArray    System out println  bs encodeBytes byteArray       bs decode bs encodeBytes byteArray    System out println bs decode bs encodeBytes byteArray

User · Answer

something like     String source    password    byte   byteArray  try       byteArray   source getBytes  UTF-16        System out println new String Base64 decode Base64 encode byteArray             Base64 DEFAULT   Base64 DEFAULT       catch  UnsupportedEncodingException e           TODO Auto-generated catch block     e printStackTrace

User · Answer

package net itempire virtualapp   import android support v7 app AppCompatActivity  import android os Bundle  import android util Base64  import android view View  import android widget EditText  import android widget TextView   public class BaseActivity extends AppCompatActivity   EditText editText  TextView textView  TextView textView2  TextView textView3  TextView textView4       Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity base           editText  EditText findViewById R id edt           textView  TextView  findViewById R id tv1           textView2  TextView  findViewById R id tv2           textView3  TextView  findViewById R id tv3           textView4  TextView  findViewById R id tv4           textView setOnClickListener new View OnClickListener                  Override             public void onClick View v                 textView2 setText Base64 encodeToString editText getText   toString   getBytes   Base64 DEFAULT                                       textView3 setOnClickListener new View OnClickListener                  Override             public void onClick View v                    textView4 setText new String Base64 decode textView2 getText   toString   Base64 DEFAULT

User · Answer

Above many answers but doesn t work for me some of them no exception handling in correct way  here am adding a perfect solution work amazing for me sure also for you too    base64 decode string   String s    quot ewoic2VydmVyIjoic2cuenhjLmx1IiwKInNuaSI6InRlc3RpbmciLAoidXNlcm5hbWUiOiJ0ZXN0     ZXIiLAoicGFzc3dvcmQiOiJ0ZXN0ZXIiLAoicG9ydCI6IjQ0MyIKfQ   quot       String val   a s         Toast makeText this   quot  quot  val  Toast LENGTH SHORT  show                public static String a String str                 try                    return new String Base64 decode str  0    quot UTF-8 quot                   catch  UnsupportedEncodingException   IllegalArgumentException unused                     return  quot This is not a base64 data quot

User · Answer

Based on the previous answers I m using the following utility methods in case anyone would like to use it               param message the message to be encoded        return the enooded from of the message     public static String toBase64 String message        byte   data      try           data   message getBytes  UTF-8            String base64Sms   Base64 encodeToString data  Base64 DEFAULT           return base64Sms        catch  UnsupportedEncodingException e            e printStackTrace               return null             param message the encoded message        return the decoded message     public static String fromBase64 String message        byte   data   Base64 decode message  Base64 DEFAULT       try           return new String data   UTF-8          catch  UnsupportedEncodingException e            e printStackTrace               return null

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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

User · Answer

for android API byte   to Base64String encoder  byte   data new byte    String Base64encodeString android util Base64 encodeToString data  android util Base64 DEFAULT

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To encrypt    byte   encrpt  text getBytes  UTF-8    String base64   Base64 encodeToString encrpt  Base64 DEFAULT     To decrypt   byte   decrypt  Base64 decode base64  Base64 DEFAULT   String text   new String decrypt   UTF-8

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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

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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

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lt  xml version  1 0  encoding  utf-8   gt   lt LinearLayout xmlns android  http   schemas android com apk res android      xmlns app  http   schemas android com apk res-auto      xmlns tools  http   schemas android com tools      android layout width  match parent      android orientation  vertical      android layout height  match parent      tools context   BaseActivity  gt      lt EditText        android layout width  match parent         android layout height  wrap content         android id    id edt         android paddingTop  30dp           gt       lt TextView         android layout width  wrap content          android layout height  wrap content          android id    id tv1          android text  Encode          android textSize  20dp          android padding  20dp            gt       lt TextView         android layout width  wrap content          android layout height  wrap content          android id    id tv2           android textSize  20dp          android padding  20dp            gt       lt TextView         android layout width  wrap content          android layout height  wrap content          android id    id tv3          android text  decode          android textSize  20dp          android padding  20dp            gt       lt TextView         android layout width  wrap content          android layout height  wrap content          android id    id tv4          android textSize  20dp          android padding  20dp              gt   lt  LinearLayout gt

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First    Choose an encoding  UTF-8 is generally a good choice  stick to an encoding which will definitely be valid on both sides  It would be rare to use something other than UTF-8 or UTF-16    Transmitting end    Encode the string to bytes  e g  text getBytes encodingName   Encode the bytes to base64 using the Base64 class Transmit the base64   Receiving end    Receive the base64 Decode the base64 to bytes using the Base64 class Decode the bytes to a string  e g  new String bytes  encodingName     So something like      Sending side byte   data   text getBytes  UTF-8    String base64   Base64 encodeToString data  Base64 DEFAULT       Receiving side byte   data   Base64 decode base64  Base64 DEFAULT   String text   new String data   UTF-8      Or with StandardCharsets      Sending side byte   data   text getBytes StandardCharsets UTF 8   String base64   Base64 encodeToString data  Base64 DEFAULT       Receiving side byte   data   Base64 decode base64  Base64 DEFAULT   String text   new String data  StandardCharsets UTF 8

User · Answer

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

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For API level 26   String encodedString   Base64 getEncoder   encodeToString byteArray     Ref  https   developer android com reference java util Base64 Encoder html encodeToString byte

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Answer from 2021 in kotlin Encode           val data  String    quot Hello quot          val dataByteArray  ByteArray   data toByteArray           val dataInBase64  String   Base64Utils encode dataByteArray   Decode           val dataInBase64  String    quot     quot          val dataByteArray  ByteArray   Base64Utils decode dataInBase64          val data  String   dataByteArray toString

[java] Base 64 encode and decode example code

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