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Added in API level 18

public static interface MediaDrm.OnEventListener

android.media.MediaDrm.OnEventListener

DRM事件发生时要调用的回调接口定义

Public methods
`abstract void`	`onEvent(MediaDrm md, byte[] sessionId, int event, int extra, byte[] data)` 当发生需要应用程序通知的事件时调用

Added in API level 18

void onEvent (MediaDrm md, 
                byte[] sessionId, 
                int event, 
                int extra, 
                byte[] data)

当发生需要应用程序通知的事件时调用

Parameters
`md`	`MediaDrm`: the MediaDrm object on which the event occurred
`sessionId`	`byte`: the DRM session ID on which the event occurred, or `null` if there is no session ID associated with the event.
`event`	`int`: indicates the event type
`extra`	`int`: an secondary error code
`data`	`byte`: optional byte array of data that may be associated with the event