Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)   
Deprecated in [API level
30](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels) Summary: [Nested Classes](https://developer.android.com/reference/android/text/LoginFilter#nestedclasses) \| [Methods](https://developer.android.com/reference/android/text/LoginFilter#pubmethods) \| [Inherited Methods](https://developer.android.com/reference/android/text/LoginFilter#inhmethods)

# LoginFilter

*** ** * ** ***


`
public


abstract
class
LoginFilter
`


`

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


`

`


implements

https://developer.android.com/reference/android/text/InputFilter


`

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

|---|
| Known direct subclasses [LoginFilter.PasswordFilterGMail](https://developer.android.com/reference/android/text/LoginFilter.PasswordFilterGMail), [LoginFilter.UsernameFilterGMail](https://developer.android.com/reference/android/text/LoginFilter.UsernameFilterGMail), [LoginFilter.UsernameFilterGeneric](https://developer.android.com/reference/android/text/LoginFilter.UsernameFilterGeneric) |---|---| | [LoginFilter.PasswordFilterGMail](https://developer.android.com/reference/android/text/LoginFilter.PasswordFilterGMail) | *This class was deprecated in API level 30. Do not handle a user's Google password. Refer to [Google Help](https://support.google.com/accounts/answer/32040) for password restriction information.* | | [LoginFilter.UsernameFilterGMail](https://developer.android.com/reference/android/text/LoginFilter.UsernameFilterGMail) | *This class was deprecated in API level 30. Do not encode assumptions about Google account names into client applications.* | | [LoginFilter.UsernameFilterGeneric](https://developer.android.com/reference/android/text/LoginFilter.UsernameFilterGeneric) | This filter rejects characters in the user name that are not compatible with Google login. | |

<br />

*** ** * ** ***


**This class was deprecated
in API level 30.**   

Password requirements should not be hardcoded in clients. This class also does not
handle non-BMP characters.

Abstract class for filtering login-related text (user names and passwords)

## Summary

| ### Nested classes ||
|---|---|
| ` class` | `https://developer.android.com/reference/android/text/LoginFilter.PasswordFilterGMail` *This class was deprecated in API level 30. Do not handle a user's Google password. Refer to [Google Help](https://support.google.com/accounts/answer/32040) for password restriction information.* |
| ` class` | `https://developer.android.com/reference/android/text/LoginFilter.UsernameFilterGMail` *This class was deprecated in API level 30. Do not encode assumptions about Google account names into client applications.* |
| ` class` | `https://developer.android.com/reference/android/text/LoginFilter.UsernameFilterGeneric` This filter rejects characters in the user name that are not compatible with Google login. |

| ### Public methods ||
|---|---|
| ` https://developer.android.com/reference/java/lang/CharSequence` | ` https://developer.android.com/reference/android/text/LoginFilter#filter(java.lang.CharSequence,%20int,%20int,%20android.text.Spanned,%20int,%20int)(https://developer.android.com/reference/java/lang/CharSequence source, int start, int end, https://developer.android.com/reference/android/text/Spanned dest, int dstart, int dend) ` This method is called when the buffer is going to replace the range `dstart ... dend` of `dest` with the new text from the range `start ... end` of `source`. |
| ` abstract boolean` | ` https://developer.android.com/reference/android/text/LoginFilter#isAllowed(char)(char c) ` Returns whether or not we allow character c. |
| ` void` | ` https://developer.android.com/reference/android/text/LoginFilter#onInvalidCharacter(char)(char c) ` Called whenever we encounter an invalid character. |
| ` void` | ` https://developer.android.com/reference/android/text/LoginFilter#onStart()() ` Called when we start processing filter. |
| ` void` | ` https://developer.android.com/reference/android/text/LoginFilter#onStop()() ` Called when we're done processing filter |

| ### 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/text/InputFilter ` |---|---| | ` abstract https://developer.android.com/reference/java/lang/CharSequence` | ` https://developer.android.com/reference/android/text/InputFilter#filter(java.lang.CharSequence,%20int,%20int,%20android.text.Spanned,%20int,%20int)(https://developer.android.com/reference/java/lang/CharSequence source, int start, int end, https://developer.android.com/reference/android/text/Spanned dest, int dstart, int dend) ` This method is called when the buffer is going to replace the range `dstart ... dend` of `dest` with the new text from the range `start ... end` of `source`. | ||

## Public methods

### filter

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public CharSequence filter (CharSequence source, 
                int start, 
                int end, 
                Spanned dest, 
                int dstart, 
                int dend)
```

This method is called when the buffer is going to replace the
range `dstart ... dend` of `dest`
with the new text from the range `start ... end`
of `source`. Returns the CharSequence that we want
placed there instead, including an empty string
if appropriate, or `null` to accept the original
replacement. Be careful to not to reject 0-length replacements,
as this is what happens when you delete text.

<br />

| Parameters ||
|---|---|
| `source` | `CharSequence` <br /> |
| `start` | `int` <br /> |
| `end` | `int` <br /> |
| `dest` | `Spanned` <br /> |
| `dstart` | `int` <br /> |
| `dend` | `int` <br /> |

| Returns ||
|---|---|
| `https://developer.android.com/reference/java/lang/CharSequence` | <br /> |

### isAllowed

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public abstract boolean isAllowed (char c)
```

Returns whether or not we allow character c.
Subclasses must override this method.

<br />

| Parameters ||
|---|---|
| `c` | `char` <br /> |

| Returns ||
|---|---|
| `boolean` | <br /> |

### onInvalidCharacter

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public void onInvalidCharacter (char c)
```

Called whenever we encounter an invalid character.

<br />

| Parameters ||
|---|---|
| `c` | `char`: the invalid character <br /> |

### onStart

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public void onStart ()
```

Called when we start processing filter.

<br />

### onStop

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public void onStop ()
```

Called when we're done processing filter

<br />