blocks|key|787022|text|就像这样|type|unstyled|depth|inlineStyleRanges|entityRanges|data|787023|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();
}|code-block|syntax|javascript|787024|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

something like 

<pre><code>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();
}
</code></pre>

blocks|key|787054|text|对于在这里搜索如何解码用Base64.encodeBytes()编码的字符串的信息的其他人，这是我的解决方案：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|787055|//+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");+|code-block|syntax|javascript|787056|此外，我还支持老版本的安卓系统，所以我使用的是罗伯特·哈德的http://iharder.net/base64+Base64库|787057|entityMap|0|LINK|mutability|MUTABLE|url|http://iharder.net/base64^0|C|K|0|0|U|P|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

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

<pre><code>// 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"); 
</code></pre>

Also, I'm supporting older versions of Android so I'm using Robert Harder's Base64 library from <a href="http://iharder.net/base64" rel="noreferrer">http://iharder.net/base64</a>

blocks|key|571062|text|要加密：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|571063|byte[]+encrpt=+text.getBytes("UTF-8");
String+base64+=+Base64.encodeToString(encrpt,+Base64.DEFAULT);|code-block|syntax|javascript|571064|解密：|571065|byte[]+decrypt=+Base64.decode(base64,+Base64.DEFAULT);
String+text+=+new+String(decrypt,+"UTF-8");|571066|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

To encrypt: 

<pre><code>byte[] encrpt= text.getBytes("UTF-8");
String base64 = Base64.encodeToString(encrpt, Base64.DEFAULT);
</code></pre>

To decrypt:

<pre><code>byte[] decrypt= Base64.decode(base64, Base64.DEFAULT);
String text = new String(decrypt, "UTF-8");
</code></pre>

blocks|key|571140|text|基于前面的回答，我使用以下实用程序方法，以防有人想要使用它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|571141|++++/**
+*+@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;
}|code-block|syntax|javascript|571142|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Based on the previous answers I'm using the following utility methods in case anyone would like to use it.

<pre><code> /**
 * @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;
}
</code></pre>

blocks|key|787219|text|适用于android+API+byte[]+to+Base64String编码器|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|787220|byte[]+data=new+byte[];
String+Base64encodeString=android.util.Base64.encodeToString(data,+android.util.Base64.DEFAULT);|code-block|syntax|javascript|787221|entityMap^0|F|6|P|C|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

for android API <code>byte[]</code> to <code>Base64String</code> encoder

<pre><code>byte[] data=new byte[];
String Base64encodeString=android.util.Base64.encodeToString(data, android.util.Base64.DEFAULT);
</code></pre>

blocks|key|787276|text|适用于API级别26%2B|type|unstyled|depth|inlineStyleRanges|entityRanges|data|787277|String+encodedString+=+Base64.getEncoder().encodeToString(byteArray);|code-block|syntax|javascript|787278|参考：[https://developer.android.com/reference/java/util/Base64.Encoder.html#encodeToString(byte[])](https://developer.android.com/reference/java/util/Base64.Encoder.html#encodeToString(byte[]%2529)|offset|length|787279|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.android.com/reference/java/util/Base64.Encoder.html#encodeToString(byte[])|1|https://developer.android.com/reference/java/util/Base64.Encoder.html#encodeToString(byte[]%2529^0|0|0|4|2K|0|2Q|2M|1|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@$I|X|J|Y|1|Z]|$I|10|J|11|1|12]]|A|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]|S|$5|N|O|P|A|$Q|T]]]]

For API level 26+

<pre><code>String encodedString = Base64.getEncoder().encodeToString(byteArray);
</code></pre>

Ref:
<a href="https://developer.android.com/reference/java/util/Base64.Encoder.html#encodeToString(byte[])" rel="nofollow noreferrer">https://developer.android.com/reference/java/util/Base64.Encoder.html#encodeToString(byte[])</a>

blocks|key|571272|text|++++<?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="@%2Bid/edt"
+++++++android:paddingTop="30dp"
+++++++/>
++++<TextView
++++++++android:layout_width="wrap_content"
++++++++android:layout_height="wrap_content"
++++++++android:id="@%2Bid/tv1"
++++++++android:text="Encode"
++++++++android:textSize="20dp"
++++++++android:padding="20dp"
++++++++/>
++++<TextView
++++++++android:layout_width="wrap_content"
++++++++android:layout_height="wrap_content"
++++++++android:id="@%2Bid/tv2"

++++++++android:textSize="20dp"
++++++++android:padding="20dp"
++++++++/>
++++<TextView
++++++++android:layout_width="wrap_content"
++++++++android:layout_height="wrap_content"
++++++++android:id="@%2Bid/tv3"
++++++++android:text="decode"
++++++++android:textSize="20dp"
++++++++android:padding="20dp"
++++++++/>
++++<TextView
++++++++android:layout_width="wrap_content"
++++++++android:layout_height="wrap_content"
++++++++android:id="@%2Bid/tv4"
++++++++android:textSize="20dp"
++++++++android:padding="20dp"


++++++++/>
</LinearLayout>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|571273|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> &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;
</code></pre>

blocks|key|571285|text|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)));

++++++++++++}
++++++++});


++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|571286|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>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)));

 }
 });


 }
}
</code></pre>

blocks|key|571334|text|上面有很多答案，但对我不起作用，其中一些没有以正确的方式进行异常处理。在这里我添加了一个完美的解决方案，对我来说很神奇，当然对你也是如此。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|571335|//base64+decode+string+
+String+s+=+"ewoic2VydmVyIjoic2cuenhjLmx1IiwKInNuaSI6InRlc3RpbmciLAoidXNlcm5hbWUiOiJ0ZXN0
++++ZXIiLAoicGFzc3dvcmQiOiJ0ZXN0ZXIiLAoicG9ydCI6IjQ0MyIKfQ==";
++++String+val+=+a(s)+;
+++++Toast.makeText(this,+""%2Bval,+Toast.LENGTH_SHORT).show();
++++
+++++++public+static+String+a(String+str)+{
+++++++++++++try+{
+++++++++++++++++return+new+String(Base64.decode(str,+0),+"UTF-8");
+++++++++++++}+catch+(UnsupportedEncodingException+%7C+IllegalArgumentException+unused)+{
+++++++++++++++++return+"This+is+not+a+base64+data";
+++++++++++++}
+++++++++}|code-block|syntax|javascript|571336|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

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.
<pre><code>//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;;
 }
 }
</code></pre>

blocks|key|787459|text|来自kotlin的2021年答案|type|unstyled|depth|inlineStyleRanges|entityRanges|data|787460|编码：|787461|++++++++val+data:+String+=+"Hello"
++++++++val+dataByteArray:+ByteArray+=+data.toByteArray()
++++++++val+dataInBase64:+String+=+Base64Utils.encode(dataByteArray)|code-block|syntax|javascript|787462|解码：|787463|++++++++val+dataInBase64:+String+=+"..."
++++++++val+dataByteArray:+ByteArray+=+Base64Utils.decode(dataInBase64)
++++++++val+data:+String+=+dataByteArray.toString()|787464|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Answer from 2021 in kotlin
Encode :
<pre><code> val data: String = &quot;Hello&quot;
 val dataByteArray: ByteArray = data.toByteArray()
 val dataInBase64: String = Base64Utils.encode(dataByteArray)
</code></pre>
Decode :
<pre><code> val dataInBase64: String = &quot;...&quot;
 val dataByteArray: ByteArray = Base64Utils.decode(dataInBase64)
 val data: String = dataByteArray.toString()
</code></pre>

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.

<pre><code>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)));
</code></pre>

Base 64 encode and decode example code

有人知道如何使用Base64对Base64中的字符串进行解码和编码吗？我正在使用以下代码，但它不起作用。String source = "password"; byte[] byteArray = source.getBytes("UTF-16"); Base64 bs = new Base64(); //bs.enc...

问Base 64编码和解码示例代码
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