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Added in API level 18

public static interface RemoteControlClient.OnGetPlaybackPositionListener

android.media.RemoteControlClient.OnGetPlaybackPositionListener

在查询媒体播放位置时调用回调的接口定义。

也可以看看：

Public methods
`abstract long`	`onGetPlaybackPosition()` 调用接口的实现者来查询当前播放位置。

Added in API level 18

long onGetPlaybackPosition ()

调用接口的实现者来查询当前播放位置。

Returns
`long`	a negative value if the current playback position (or the last valid playback position) is not known, or a zero or positive value expressed in ms indicating the current position, or the last valid known position.