# VirtualDisplay.Callback

Added in[API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  
Summary:[Ctors](https://developer.android.com/reference/android/hardware/display/VirtualDisplay.Callback#pubctors)\|[Methods](https://developer.android.com/reference/android/hardware/display/VirtualDisplay.Callback#pubmethods)\|[Inherited Methods](https://developer.android.com/reference/android/hardware/display/VirtualDisplay.Callback#inhmethods)  

# VirtualDisplay.Callback

*** ** * ** ***

[Kotlin](https://developer.android.com/reference/kotlin/android/hardware/display/VirtualDisplay.Callback "View this page in Kotlin")\|Java

`
public
static

abstract
class
VirtualDisplay.Callback
`  
`

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


``


`

|---|--------------------------------------------------|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) ||
| ↳ | android.hardware.display.VirtualDisplay.Callback |

<br />

*** ** * ** ***

Interface for receiving information about a[VirtualDisplay](https://developer.android.com/reference/android/hardware/display/VirtualDisplay)'s state changes.

## Summary

|                                                  ### Public constructors                                                   ||
|-------------------------------------------------------------------------------------------------------------------------|---|
| ` `[Callback](https://developer.android.com/reference/android/hardware/display/VirtualDisplay.Callback#Callback())`() ` |

|                                                                                                                                          ### Public methods                                                                                                                                           ||
|---------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ` void` | ` `[onPaused](https://developer.android.com/reference/android/hardware/display/VirtualDisplay.Callback#onPaused())`() ` Called when the virtual display video projection has been paused by the system or when the surface has been detached by the application by calling setSurface(null). |
| ` void` | ` `[onResumed](https://developer.android.com/reference/android/hardware/display/VirtualDisplay.Callback#onResumed())`() ` Called when the virtual display video projection has been resumed after having been paused.                                                                        |
| ` void` | ` `[onStopped](https://developer.android.com/reference/android/hardware/display/VirtualDisplay.Callback#onStopped())`() ` Called when the virtual display video projection has been stopped 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 constructors

### Callback

```
public Callback ()
```

<br />

<br />

## Public methods

### onPaused

Added in[API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  

```
public void onPaused ()
```

Called when the virtual display video projection has been paused by the system or when the surface has been detached by the application by calling setSurface(null). The surface will not receive any more buffers while paused.

<br />

### onResumed

Added in[API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  

```
public void onResumed ()
```

Called when the virtual display video projection has been resumed after having been paused.

<br />

### onStopped

Added in[API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  

```
public void onStopped ()
```

Called when the virtual display video projection has been stopped by the system. It will no longer receive frames and it will never be resumed. It is still the responsibility of the application to release() the virtual display.

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