按键声音功能实现介绍"/>
android 按键声音功能实现介绍
1.Android的audio流的类型有以下12种:
- /* The audio stream for phone calls */
- public static final int STREAM_VOICE_CALL = 0;//通话连接时的音频流(通话声)
- /* The audio stream for system sounds */
- public static final int STREAM_SYSTEM = 1;//系统音频流
- /* The audio stream for the phone ring and message alerts */
- public static final int STREAM_RING = 2;//来电铃声
- /* The audio stream for music playback */
- public static final int STREAM_MUSIC = 3;//媒体音频流
- /* The audio stream for alarms */
- public static final int STREAM_ALARM = 4;//闹钟音频流
- /* The audio stream for notifications */
- public static final int STREAM_NOTIFICATION = 5;//通知音频流
- /* @hide The audio stream for phone calls when connected on bluetooth */
- public static final int STREAM_BLUETOOTH_SCO = 6;//从注释上看时使用蓝牙耳机通话的音频流
- /* @hide The audio stream for enforced system sounds in certain countries (e.g camera in Japan) */
- public static final int STREAM_SYSTEM_ENFORCED = 7;//一些国家强制使用的音频流??不太明白
- /* @hide The audio stream for DTMF tones */
- public static final int STREAM_DTMF = 8;//DTMF音频流
- /* @hide The audio stream for text to speech (TTS) */
- public static final int STREAM_TTS = 9;//TTS: Text to Speech:文件到语言的音频流,即机器说话
- /* @hide The audio stream for Fm */
- public static final int STREAM_FM = 10;//FM的音频流
- /* @hide The audio stream for MATV */
- public static final int STREAM_MATV = 11;//TV的音频流
每种音频流所规定的最大值:
- /** @hide Maximum volume index values for audio streams */
- private int[] MAX_STREAM_VOLUME = new int[] {
- 6, // STREAM_VOICE_CALL
- 7, // STREAM_SYSTEM
- 7, // STREAM_RING
- 12, // STREAM_MUSIC
- 7, // STREAM_ALARM
- 7, // STREAM_NOTIFICATION
- 15, // STREAM_BLUETOOTH_SCO
- 7, // STREAM_SYSTEM_ENFORCED
- 15, // STREAM_DTMF
- 15, // STREAM_TTS
- 13, //STREAM_FM
- 13 //stream_MATV
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android 按键声音功能实现介绍
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