Android中关于Audio的一些官方文章
Controlling Your App’s Volume and Playback
http://developer.android.com/training/managing-audio/volume-playback.html
Managing Audio Focus
http://developer.android.com/training/managing-audio/audio-focus.html
Dealing with Audio Output Hardware
http://developer.android.com/training/managing-audio/audio-output.html
Media Playback
http://developer.android.com/guide/topics/media/mediaplayer.html
Audio Capture
http://developer.android.com/guide/topics/media/audio-capture.html
Using Text-to-Speech
http://developer.android.com/resources/articles/tts.html
Speech Input
http://developer.android.com/resources/articles/speech-input.html
TtsEngine - Text To Speech Engine
http://developer.android.com/resources/samples/TtsEngine/index.html
