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Summary: Ctors | Methods | Inherited Methods

# StorageManager.StorageVolumeCallback

`public static class StorageManager.StorageVolumeCallback`
`extends Object` ``

java.lang.Object
↳ | android.os.storage.StorageManager.StorageVolumeCallback

Callback that delivers `StorageVolume` related events.

For example, this can be used to detect when a volume changes to the `Environment#MEDIA_MOUNTED` or `Environment#MEDIA_UNMOUNTED` states.

See also:

- `StorageManager.registerStorageVolumeCallback(Executor, StorageManager.StorageVolumeCallback)`
- `StorageManager.unregisterStorageVolumeCallback(StorageManager.StorageVolumeCallback)`

## Summary

### Public constructors
`StorageVolumeCallback()`

### Public methods
`void` | `onStateChanged(StorageVolume volume)` Called when `StorageVolume#getState()` changes, such as changing to the `Environment#MEDIA_MOUNTED` or `Environment#MEDIA_UNMOUNTED` states.

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

## Public constructors

### StorageVolumeCallback

    public StorageVolumeCallback ()

## Public methods

### onStateChanged

    public void onStateChanged (StorageVolume volume)

Called when `StorageVolume#getState()` changes, such as changing to the `Environment#MEDIA_MOUNTED` or `Environment#MEDIA_UNMOUNTED` states.

The given argument is a snapshot in time and can be used to process events in the order they occurred, or you can call `StorageManager#getStorageVolumes()` to observe the latest value.

Parameters
`volume` | `StorageVolume`: This value cannot be `null`.

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