Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels) Summary: [Nested Classes](https://developer.android.com/reference/java/util/Base64#nestedclasses) \| [Methods](https://developer.android.com/reference/java/util/Base64#pubmethods) \| [Inherited Methods](https://developer.android.com/reference/java/util/Base64#inhmethods)

# Base64

` public final class Base64 `   
` extends https://developer.android.com/reference/java/lang/Object ` ` `

|---|---|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) ||
| ↳ | java.util.Base64 |

<br />

*** ** * ** ***

This class consists exclusively of static methods for obtaining encoders and decoders for the Base64 encoding scheme. The implementation of this class supports the following types of Base64 as specified in [RFC 4648](http://www.ietf.org/rfc/rfc4648.txt) and [RFC 2045](http://www.ietf.org/rfc/rfc2045.txt).

- **Basic**

  Uses "The Base64 Alphabet" as specified in Table 1 of RFC 4648 and RFC 2045 for encoding and decoding operation. The encoder does not add any line feed (line separator) character. The decoder rejects data that contains characters outside the base64 alphabet.
- **URL and Filename safe**

  Uses the "URL and Filename safe Base64 Alphabet" as specified in Table 2 of RFC 4648 for encoding and decoding. The encoder does not add any line feed (line separator) character. The decoder rejects data that contains characters outside the base64 alphabet.
- **MIME**

  Uses "The Base64 Alphabet" as specified in Table 1 of RFC 2045 for encoding and decoding operation. The encoded output must be represented in lines of no more than 76 characters each and uses a carriage return `'\r'` followed immediately by a linefeed `'\n'` as the line separator. No line separator is added to the end of the encoded output. All line separators or other characters not found in the base64 alphabet table are ignored in decoding operation.

Unless otherwise noted, passing a `null` argument to a method of this class will cause a `https://developer.android.com/reference/java/lang/NullPointerException` to be thrown.

## Summary

| ### Nested classes ||
|---|---|
| ` class` | `https://developer.android.com/reference/java/util/Base64.Decoder` This class implements a decoder for decoding byte data using the Base64 encoding scheme as specified in RFC 4648 and RFC 2045. |
| ` class` | `https://developer.android.com/reference/java/util/Base64.Encoder` This class implements an encoder for encoding byte data using the Base64 encoding scheme as specified in RFC 4648 and RFC 2045. |

| ### Public methods ||
|---|---|
| ` static https://developer.android.com/reference/java/util/Base64.Decoder` | ` https://developer.android.com/reference/java/util/Base64#getDecoder()() ` Returns a `https://developer.android.com/reference/java/util/Base64.Decoder` that decodes using the [Basic](https://developer.android.com/reference/java/util/Base64#basic) type base64 encoding scheme. |
| ` static https://developer.android.com/reference/java/util/Base64.Encoder` | ` https://developer.android.com/reference/java/util/Base64#getEncoder()() ` Returns a `https://developer.android.com/reference/java/util/Base64.Encoder` that encodes using the [Basic](https://developer.android.com/reference/java/util/Base64#basic) type base64 encoding scheme. |
| ` static https://developer.android.com/reference/java/util/Base64.Decoder` | ` https://developer.android.com/reference/java/util/Base64#getMimeDecoder()() ` Returns a `https://developer.android.com/reference/java/util/Base64.Decoder` that decodes using the [MIME](https://developer.android.com/reference/java/util/Base64#mime) type base64 decoding scheme. |
| ` static https://developer.android.com/reference/java/util/Base64.Encoder` | ` https://developer.android.com/reference/java/util/Base64#getMimeEncoder()() ` Returns a `https://developer.android.com/reference/java/util/Base64.Encoder` that encodes using the [MIME](https://developer.android.com/reference/java/util/Base64#mime) type base64 encoding scheme. |
| ` static https://developer.android.com/reference/java/util/Base64.Encoder` | ` https://developer.android.com/reference/java/util/Base64#getMimeEncoder(int,%20byte[])(int lineLength, byte[] lineSeparator) ` Returns a `https://developer.android.com/reference/java/util/Base64.Encoder` that encodes using the [MIME](https://developer.android.com/reference/java/util/Base64#mime) type base64 encoding scheme with specified line length and line separators. |
| ` static https://developer.android.com/reference/java/util/Base64.Decoder` | ` https://developer.android.com/reference/java/util/Base64#getUrlDecoder()() ` Returns a `https://developer.android.com/reference/java/util/Base64.Decoder` that decodes using the [URL and Filename safe](https://developer.android.com/reference/java/util/Base64#url) type base64 encoding scheme. |
| ` static https://developer.android.com/reference/java/util/Base64.Encoder` | ` https://developer.android.com/reference/java/util/Base64#getUrlEncoder()() ` Returns a `https://developer.android.com/reference/java/util/Base64.Encoder` that encodes using the [URL and Filename safe](https://developer.android.com/reference/java/util/Base64#url) type base64 encoding scheme. |

### Inherited methods

From class ` https://developer.android.com/reference/java/lang/Object ` ` https://developer.android.com/reference/java/lang/Object` ` https://developer.android.com/reference/java/lang/Object#clone()() `

Creates and returns a copy of this object.
` boolean` ` https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) `

Indicates whether some other object is "equal to" this one.
` void` ` https://developer.android.com/reference/java/lang/Object#finalize()() `

Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
` final https://developer.android.com/reference/java/lang/Class<?>` ` https://developer.android.com/reference/java/lang/Object#getClass()() `

Returns the runtime class of this `Object`.
` int` ` https://developer.android.com/reference/java/lang/Object#hashCode()() `

Returns a hash code value for the object.
` final void` ` https://developer.android.com/reference/java/lang/Object#notify()() `

Wakes up a single thread that is waiting on this object's monitor.
` final void` ` https://developer.android.com/reference/java/lang/Object#notifyAll()() `

Wakes up all threads that are waiting on this object's monitor.
` https://developer.android.com/reference/java/lang/String` ` https://developer.android.com/reference/java/lang/Object#toString()() `

Returns a string representation of the object.
` final void` ` https://developer.android.com/reference/java/lang/Object#wait(long,%20int)(long timeoutMillis, int nanos) `

Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*, or until a certain amount of real time has elapsed.
` final void` ` https://developer.android.com/reference/java/lang/Object#wait(long)(long timeoutMillis) `

Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*, or until a certain amount of real time has elapsed.
` final void` ` https://developer.android.com/reference/java/lang/Object#wait()() `

Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*.

## Public methods

### getDecoder

Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public static Base64.Decoder getDecoder ()
```

Returns a `https://developer.android.com/reference/java/util/Base64.Decoder` that decodes using the [Basic](https://developer.android.com/reference/java/util/Base64#basic) type base64 encoding scheme.

<br />

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/util/Base64.Decoder` | A Base64 decoder. <br /> |

### getEncoder

Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public static Base64.Encoder getEncoder ()
```

Returns a `https://developer.android.com/reference/java/util/Base64.Encoder` that encodes using the [Basic](https://developer.android.com/reference/java/util/Base64#basic) type base64 encoding scheme.

<br />

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/util/Base64.Encoder` | A Base64 encoder. <br /> |

### getMimeDecoder

Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public static Base64.Decoder getMimeDecoder ()
```

Returns a `https://developer.android.com/reference/java/util/Base64.Decoder` that decodes using the [MIME](https://developer.android.com/reference/java/util/Base64#mime) type base64 decoding scheme.

<br />

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/util/Base64.Decoder` | A Base64 decoder. <br /> |

### getMimeEncoder

Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public static Base64.Encoder getMimeEncoder ()
```

Returns a `https://developer.android.com/reference/java/util/Base64.Encoder` that encodes using the [MIME](https://developer.android.com/reference/java/util/Base64#mime) type base64 encoding scheme.

<br />

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/util/Base64.Encoder` | A Base64 encoder. <br /> |

### getMimeEncoder

Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public static Base64.Encoder getMimeEncoder (int lineLength, 
                byte[] lineSeparator)
```

Returns a `https://developer.android.com/reference/java/util/Base64.Encoder` that encodes using the [MIME](https://developer.android.com/reference/java/util/Base64#mime) type base64 encoding scheme with specified line length and line separators.

<br />

| Parameters ||
|---|---|
| `lineLength` | `int`: the length of each output line (rounded down to nearest multiple of 4). If the rounded down line length is not a positive value, the output will not be separated in lines <br /> |
| `lineSeparator` | `byte`: the line separator for each output line <br /> |

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/util/Base64.Encoder` | A Base64 encoder. <br /> |

| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if `lineSeparator` includes any character of "The Base64 Alphabet" as specified in Table 1 of RFC 2045. |

### getUrlDecoder

Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public static Base64.Decoder getUrlDecoder ()
```

Returns a `https://developer.android.com/reference/java/util/Base64.Decoder` that decodes using the [URL and Filename safe](https://developer.android.com/reference/java/util/Base64#url) type base64 encoding scheme.

<br />

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/util/Base64.Decoder` | A Base64 decoder. <br /> |

### getUrlEncoder

Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public static Base64.Encoder getUrlEncoder ()
```

Returns a `https://developer.android.com/reference/java/util/Base64.Encoder` that encodes using the [URL and Filename safe](https://developer.android.com/reference/java/util/Base64#url) type base64 encoding scheme.

<br />

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/util/Base64.Encoder` | A Base64 encoder. <br /> |