Added in [API level 27](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels) Summary: [Nested Classes](https://developer.android.com/reference/android/service/autofill/CharSequenceTransformation#nestedclasses) \| [Inherited Constants](https://developer.android.com/reference/android/service/autofill/CharSequenceTransformation#inhconstants) \| [Fields](https://developer.android.com/reference/android/service/autofill/CharSequenceTransformation#lfields) \| [Methods](https://developer.android.com/reference/android/service/autofill/CharSequenceTransformation#pubmethods) \| [Inherited Methods](https://developer.android.com/reference/android/service/autofill/CharSequenceTransformation#inhmethods)

# CharSequenceTransformation

*** ** * ** ***


`
public

final

class
CharSequenceTransformation
`


`

extends https://developer.android.com/reference/java/lang/Object


`

`


implements

https://developer.android.com/reference/android/os/Parcelable,

https://developer.android.com/reference/android/service/autofill/Transformation


`

|---|---|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) ||
| ↳ | android.service.autofill.CharSequenceTransformation |

<br />

*** ** * ** ***

Replaces a `https://developer.android.com/reference/android/widget/TextView` child of a `https://developer.android.com/reference/android/service/autofill/CustomDescription` with the contents of one or
more regular expressions (regexs).

When it contains more than one field, the fields that match their regex are added to the
overall transformation result.

For example, a transformation to mask a credit card number contained in just one field would
be:

```
new CharSequenceTransformation
    .Builder(ccNumberId, Pattern.compile("^.*(\\d\\d\\d\\d)$"), "...$1")
    .build();
```

But a transformation that generates a `Exp: MM / YYYY` credit expiration date from two
fields (month and year) would be:

```
new CharSequenceTransformation
  .Builder(ccExpMonthId, Pattern.compile("^(\\d\\d)$"), "Exp: $1")
  .addField(ccExpYearId, Pattern.compile("^(\\d\\d\\d\\d)$"), " / $1");
```

<br />

## Summary

| ### Nested classes ||
|---|---|
| ` class` | `https://developer.android.com/reference/android/service/autofill/CharSequenceTransformation.Builder` Builder for `https://developer.android.com/reference/android/service/autofill/CharSequenceTransformation` objects. |

### Inherited constants

From interface `https://developer.android.com/reference/android/os/Parcelable` `int` `https://developer.android.com/reference/android/os/Parcelable#CONTENTS_FILE_DESCRIPTOR`

Descriptor bit used with `https://developer.android.com/reference/android/os/Parcelable#describeContents()`: indicates that
the Parcelable object's flattened representation includes a file descriptor.


`int` `https://developer.android.com/reference/android/os/Parcelable#PARCELABLE_WRITE_RETURN_VALUE`

Flag for use with `https://developer.android.com/reference/android/os/Parcelable#writeToParcel(android.os.Parcel,%20int)`: the object being written
is a return value, that is the result of a function such as
"`Parcelable someFunction()`",
"`void someFunction(out Parcelable)`", or
"`void someFunction(inout Parcelable)`".


| ### Fields ||
|---|---|
| ` public static final https://developer.android.com/reference/android/os/Parcelable.Creator<https://developer.android.com/reference/android/service/autofill/CharSequenceTransformation>` | `https://developer.android.com/reference/android/service/autofill/CharSequenceTransformation#CREATOR` |

| ### Public methods ||
|---|---|
| ` int` | ` https://developer.android.com/reference/android/service/autofill/CharSequenceTransformation#describeContents()() ` Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. |
| ` https://developer.android.com/reference/java/lang/String` | ` https://developer.android.com/reference/android/service/autofill/CharSequenceTransformation#toString()() ` Returns a string representation of the object. |
| ` void` | ` https://developer.android.com/reference/android/service/autofill/CharSequenceTransformation#writeToParcel(android.os.Parcel,%20int)(https://developer.android.com/reference/android/os/Parcel parcel, int flags) ` Flatten this object in to a Parcel. |

### 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*.


From interface `

https://developer.android.com/reference/android/os/Parcelable

` `
abstract


int` `
https://developer.android.com/reference/android/os/Parcelable#describeContents()()
`

Describe the kinds of special objects contained in this Parcelable
instance's marshaled representation.


`
abstract


void` `
https://developer.android.com/reference/android/os/Parcelable#writeToParcel(android.os.Parcel,%20int)(https://developer.android.com/reference/android/os/Parcel dest, int flags)
`

Flatten this object in to a Parcel.


## Fields

### CREATOR

Added in [API level 27](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public static final Creator<CharSequenceTransformation> CREATOR
```

<br />

<br />

## Public methods

### describeContents

Added in [API level 27](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public int describeContents ()
```

Describe the kinds of special objects contained in this Parcelable
instance's marshaled representation. For example, if the object will
include a file descriptor in the output of `https://developer.android.com/reference/android/os/Parcelable#writeToParcel(android.os.Parcel,%20int)`,
the return value of this method must include the
`https://developer.android.com/reference/android/os/Parcelable#CONTENTS_FILE_DESCRIPTOR` bit.

<br />

| Returns ||
|---|---|
| `int` | a bitmask indicating the set of special object types marshaled by this Parcelable object instance. Value is either `0` or - `https://developer.android.com/reference/android/os/Parcelable#CONTENTS_FILE_DESCRIPTOR` |

### toString

Added in [API level 27](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public String toString ()
```

Returns a string representation of the object.

<br />

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/String` | a string representation of the object. <br /> |

### writeToParcel

Added in [API level 27](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public void writeToParcel (Parcel parcel, 
                int flags)
```

Flatten this object in to a Parcel.

<br />

| Parameters ||
|---|---|
| `parcel` | `Parcel`: The Parcel in which the object should be written. This value cannot be `null`. <br /> |
| `flags` | `int`: Additional flags about how the object should be written. May be 0 or `https://developer.android.com/reference/android/os/Parcelable#PARCELABLE_WRITE_RETURN_VALUE`. Value is either `0` or a combination of the following: - `https://developer.android.com/reference/android/os/Parcelable#PARCELABLE_WRITE_RETURN_VALUE` |