【原因分析】
需要修改默认的Audio值和调节范围
music : 0- 15(U50) default: 5 pepito: 0- 15 default: 5 KO
notification : 0 - 7(U50) default :5 pepito : 0 -15 default: 9 KO
Alarm : 0 - 7(U50) default :6 pepito : 0 -15 default: 11 KO
system : 0 - 7(U50) default :5 pepito : 0 -7 default: 5 KO
【解决方案】
- 在/platform/frameworks/base/media/java/android/media/AudioSystem.java 中修改DEFAULT_STREAM_VOLUME数组默认值
public static int[] DEFAULT_STREAM_VOLUME = new int[] {
4, // STREAM_VOICE_CALL
11, // STREAM_SYSTEM
5, // STREAM_RING
7, // STREAM_MUSIC
11, // STREAM_ALARM
9, // STREAM_NOTIFICATION
7, // STREAM_BLUETOOTH_SCO
7, // STREAM_SYSTEM_ENFORCED
5, // STREAM_DTMF
5, // STREAM_TTS
5, // STREAM_ACCESSIBILITY
};
- 在platform/frameworks/base/services/core/java/com/android/server/audio/AudioService.java 中修改MAX_STREAM_VOLUME数组范围
private static int[] MAX_STREAM_VOLUME = new int[] {
8, // STREAM_VOICE_CALL PR6931858 [email protected] add voice volume level 5-->8
15, // STREAM_SYSTEM
7, // STREAM_RING
15, // STREAM_MUSIC
15, // STREAM_ALARM
15, // STREAM_NOTIFICATION
15, // STREAM_BLUETOOTH_SCO
7, // STREAM_SYSTEM_ENFORCED
15, // STREAM_DTMF
15, // STREAM_TTS
15 // STREAM_ACCESSIBILITY
};
- 但是需要注意一下,在AudioService.java的构造方法中会重新修改STREAM_MUSIC的默认值。我这边是给ro.config.media_vol_default写入了默认值7,否则就要在下面的方法中手动赋默认值
int defaultMusicVolume = SystemProperties.getInt("ro.config.media_vol_default", -1);
if (defaultMusicVolume != -1 &&
defaultMusicVolume <= MAX_STREAM_VOLUME[AudioSystem.STREAM_MUSIC]) {
AudioSystem.DEFAULT_STREAM_VOLUME[AudioSystem.STREAM_MUSIC] = defaultMusicVolume;
} else {
if (isPlatformTelevision()) {
AudioSystem.DEFAULT_STREAM_VOLUME[AudioSystem.STREAM_MUSIC] =
MAX_STREAM_VOLUME[AudioSystem.STREAM_MUSIC] / 4;
} else {
AudioSystem.DEFAULT_STREAM_VOLUME[AudioSystem.STREAM_MUSIC] =
MAX_STREAM_VOLUME[AudioSystem.STREAM_MUSIC] / 3;
}