android 外挂字幕接口

参考：

http://developer.android.com/reference/android/media/MediaPlayer.html

1.调用mediaplayer类中的addTimedTextSource (String path, String mimeType)方法，
设置需要显示的外挂字幕文件路径。

2. 通过回调通知上层应用绘制字幕，如果获取到的getText()为空，则表示需要清除当前显示的字幕。

void	addTimedTextSource(String path, String mimeType) Adds an external timed text source file.

void	setOnTimedTextListener(MediaPlayer.OnTimedTextListener listener) Register a callback to be invoked when a timed text is available for display.

Public Methods
abstract void	onTimedText(MediaPlayer mp, TimedText text) Called to indicate an avaliable timed text

Public Methods
Rect	getBounds() Get the rectangle area or region for rendering the timed text as specified by a Rect object.
String	getText() Get the characters in the timed text.

Added in API level 16

Get the rectangle area or region for rendering the timed text as specified by a Rect object.

the rectangle region to render the characters in the timed text. If no bounds information is available (a null is returned), render the timed text at the center bottom of the display.

Added in API level 16

Get the characters in the timed text.

the characters as a String object in the TimedText. Applications should stop rendering previous timed text at the current rendering region if a null is returned, until the next non-null timed text is received.

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