Does anyone know how to decode and encode a string in Base64 using Base64?

Question

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)));

You must import this import android.util.Base64; and then can use Base64.encodeToString & Base64.decode according to your needs — Zohab Ali
– Zohab Ali, Commented Dec 8, 2018 at 10:10

Jon Skeet · Accepted Answer · 2017-01-03 18:37:38Z

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);

@max: "It's not working" is never a good description of what's happening. Will edit my post though.
Also note that you shouldn't call static methods as if they're instance methods...
if you put it like that it will work String base64 = Base64.encodeToString(data, Base64.NO_WRAP);
@portfoliobuilder: Absolutely not. UTF-8 is guaranteed to be a valid encoding in Java: see docs.oracle.com/javase/8/docs/api/java/nio/charset/Charset.html. Admittedly these days I'd specify StandardCharsets.UTF_8 instead. I've updated the answer to specify that you should be confident in the presence of the charset, but I'd pretty much always use UTF-8.
When I use Base64.DEFAULT then it says bad base64. So use Base64.URL_SAFE and enjoyee

brunql · Accepted Answer · 2018-03-23 08:04:46Z

32

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())

answered Mar 23, 2018 at 8:04

brunql

4455 silver badges6 bronze badges

8 Comments

Rolf ツ Over a year ago

Naming for these extensions functions is horrible. I would highly recommend using encodeToBase64 or something similar.

Rolf ツ Over a year ago

They are absolutely not clear and obvious. Tell me: what means "decode" or "encode"? There are thousands of decoding/encoding algorithms... What if you need Base64 and Hex? How would you name the methods then?

Rolf ツ Over a year ago

Nevertheless I would prefer something like: 'toBase64()' and 'fromBase64()' as a minimum. This way I don't need to read any documentation to know what the method will do. Keep in mind: "code is read more than it is written".

brunql Over a year ago

Yes, if i want to emphasize encoding and algorithm i will name it like toBase64UTF8(), but i don't need it, simple is better. Naming is one of the major problem in development. Please vote down on this answer and we close this dicussion, thanks.

Simas Over a year ago

So much fuss for an example :)

|

Ramesh R · Accepted Answer · 2022-09-29 10:57:37Z

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

Mohit Suthar · Accepted Answer · 2017-11-27 10:25:02Z

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"))

Nayan · Accepted Answer · 2014-03-04 05:31:05Z

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(); }

Your answer implies that encoding passwords in base64 is a good practice. In fact it is NOT as anyone can simply decode it.

Ramesh R · Accepted Answer · 2022-09-29 10:56:04Z

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");

Ramesh R · Accepted Answer · 2022-09-29 10:45:05Z

Above many answers that don't work for me, and some of them are no exception handling in the correct way. here am adding a perfect solution that works amazing for me sure also for you too.

//base64 decode string String s = "ewoic2VydmVyIjoic2cuenhjLmx1IiwKInNuaSI6InRlc3RpbmciLAoidXNlcm5hbWUiOiJ0ZXN0 ZXIiLAoicGFzc3dvcmQiOiJ0ZXN0ZXIiLAoicG9ydCI6IjQ0MyIKfQ=="; String val = a(s) ; Toast.makeText(this, ""+val, Toast.LENGTH_SHORT).show(); public static String a(String str) { try { return new String(Base64.decode(str, 0), "UTF-8"); } catch (UnsupportedEncodingException | IllegalArgumentException unused) { return "This is not a base64 data"; } }

Szabolcs Becze · Accepted Answer · 2017-11-01 07:35:39Z

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; }

4b0 · Accepted Answer · 2018-08-06 03:44:40Z

For API level 26+

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

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

Ramesh R · Accepted Answer · 2022-09-29 10:55:02Z

Answer from 2021 in Kotlin.

Encode :

val data: String = "Hello" val dataByteArray: ByteArray = data.toByteArray() val dataInBase64: String = Base64Utils.encode(dataByteArray)

Decode :

val dataInBase64: String = "..." val dataByteArray: ByteArray = Base64Utils.decode(dataInBase64) val data: String = dataByteArray.toString()

Thank you! Just accessing Base64.getEncoder is not available on if your API minimum is set to < 26!

Asif Ali · Accepted Answer · 2019-08-01 05:55:06Z

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))); } }); } }

Asif Ali · Accepted Answer · 2019-08-01 05:49:33Z

 <?xml version="1.0" encoding="utf-8"?> <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"> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/edt" android:paddingTop="30dp" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/tv1" android:text="Encode" android:textSize="20dp" android:padding="20dp" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/tv2" android:textSize="20dp" android:padding="20dp" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/tv3" android:text="decode" android:textSize="20dp" android:padding="20dp" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/tv4" android:textSize="20dp" android:padding="20dp" /> </LinearLayout>

this is for to encode and dcode through base64 in android studio
Please update your comment in answer. Also post Java and XML in single answer.
Writing some explanation along with some code is always a good practice. Thanks!

Android · Accepted Answer · 2019-08-01 06:52:34Z

-1

for android API byte[] to Base64String encoder

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

edited Aug 1, 2019 at 6:52

Android

1,4344 gold badges16 silver badges24 bronze badges

answered May 27, 2018 at 1:36

orhan

11

1 Comment

rubo77 Over a year ago

note, this is outdated, I think since Android API 26. use Base64.getEncoder().encodeToString(data) instead

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