# DisplayHashManager

Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  
Summary:[Methods](https://developer.android.com/reference/android/view/displayhash/DisplayHashManager#pubmethods)\|[Inherited Methods](https://developer.android.com/reference/android/view/displayhash/DisplayHashManager#inhmethods)  

# DisplayHashManager

*** ** * ** ***

[Kotlin](https://developer.android.com/reference/kotlin/android/view/displayhash/DisplayHashManager "View this page in Kotlin")\|Java

`
public

final

class
DisplayHashManager
`  
`

extends `[Object](https://developer.android.com/reference/java/lang/Object)`


``


`

|---|---------------------------------------------|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) ||
| ↳ | android.view.displayhash.DisplayHashManager |

<br />

*** ** * ** ***

Manages DisplayHash requests. The manager object can be retrieved by calling`Context.getSystemService(Context.DISPLAY_HASH_SERVICE)`

## Summary

|                                                                                                                                                                                                                                          ### Public methods                                                                                                                                                                                                                                           ||
|-----------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ` `[Set](https://developer.android.com/reference/java/util/Set)`<`[String](https://developer.android.com/reference/java/lang/String)`>` | ` `[getSupportedHashAlgorithms](https://developer.android.com/reference/android/view/displayhash/DisplayHashManager#getSupportedHashAlgorithms())`() ` Get a Set of DisplayHash algorithms that the device supports.                                                                                                                                         |
| ` `[VerifiedDisplayHash](https://developer.android.com/reference/android/view/displayhash/VerifiedDisplayHash)                          | ` `[verifyDisplayHash](https://developer.android.com/reference/android/view/displayhash/DisplayHashManager#verifyDisplayHash(android.view.displayhash.DisplayHash))`(`[DisplayHash](https://developer.android.com/reference/android/view/displayhash/DisplayHash)` displayHash) ` Call to verify that the DisplayHash passed in was generated by the system. |

| ### Inherited methods |
|-----------------------|---|
| From class` `[java.lang.Object](https://developer.android.com/reference/java/lang/Object)` ` |--------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` `[Object](https://developer.android.com/reference/java/lang/Object)          | ` `[clone](https://developer.android.com/reference/java/lang/Object#clone())`() ` Creates and returns a copy of this object.                                                                                                                                                      | | ` boolean`                                                                     | ` `[equals](https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object))`(`[Object](https://developer.android.com/reference/java/lang/Object)` obj) ` Indicates whether some other object is "equal to" this one.                                           | | ` void`                                                                        | ` `[finalize](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 `[Class](https://developer.android.com/reference/java/lang/Class)`<?>` | ` `[getClass](https://developer.android.com/reference/java/lang/Object#getClass())`() ` Returns the runtime class of this`Object`.                                                                                                                                                | | ` int`                                                                         | ` `[hashCode](https://developer.android.com/reference/java/lang/Object#hashCode())`() ` Returns a hash code value for the object.                                                                                                                                                 | | ` final void`                                                                  | ` `[notify](https://developer.android.com/reference/java/lang/Object#notify())`() ` Wakes up a single thread that is waiting on this object's monitor.                                                                                                                            | | ` final void`                                                                  | ` `[notifyAll](https://developer.android.com/reference/java/lang/Object#notifyAll())`() ` Wakes up all threads that are waiting on this object's monitor.                                                                                                                         | | ` `[String](https://developer.android.com/reference/java/lang/String)          | ` `[toString](https://developer.android.com/reference/java/lang/Object#toString())`() ` Returns a string representation of the object.                                                                                                                                            | | ` final void`                                                                  | ` `[wait](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`                                                                  | ` `[wait](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`                                                                  | ` `[wait](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

### getSupportedHashAlgorithms

Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  

```
public Set<String> getSupportedHashAlgorithms ()
```

Get a Set of DisplayHash algorithms that the device supports.

<br />

|                                                                                                                                                       Returns                                                                                                                                                        ||
|--------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [Set](https://developer.android.com/reference/java/util/Set)`<`[String](https://developer.android.com/reference/java/lang/String)`>` | a String Set of supported hashing algorithms. The String value of one algorithm should be used when requesting to generate the DisplayHash. This value cannot be`null`. <br /> |

### verifyDisplayHash

Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  

```
public VerifiedDisplayHash verifyDisplayHash (DisplayHash displayHash)
```

Call to verify that the DisplayHash passed in was generated by the system.

<br />

|                                                        Parameters                                                        ||
|---------------|-----------------------------------------------------------------------------------------------------------|
| `displayHash` | `DisplayHash`: The hash to verify that it was generated by the system. This value cannot be`null`. <br /> |

|                                                                                                                                                     Returns                                                                                                                                                     ||
|-------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [VerifiedDisplayHash](https://developer.android.com/reference/android/view/displayhash/VerifiedDisplayHash) | a[VerifiedDisplayHash](https://developer.android.com/reference/android/view/displayhash/VerifiedDisplayHash)if the hash was generated by the system or null if the hash cannot be verified. <br /> |