Android -

Android 9 修改系统最大默认音量

Posted by on November 4, 2021 
int maxSystemVolume = SystemProperties.getInt("ro.config.system_vol_steps", -1);
        if (maxSystemVolume != -1) {
            MAX_STREAM_VOLUME[AudioSystem.STREAM_SYSTEM] = maxSystemVolume;
        }

        int defaultSystemVolume = SystemProperties.getInt("ro.config.system_vol_default", -1);
        if (defaultSystemVolume != -1 &&
                defaultSystemVolume <= MAX_STREAM_VOLUME[AudioSystem.STREAM_SYSTEM]) {
            AudioSystem.DEFAULT_STREAM_VOLUME[AudioSystem.STREAM_SYSTEM] = defaultSystemVolume;
        } else {
            // Default is to use maximum.
            AudioSystem.DEFAULT_STREAM_VOLUME[AudioSystem.STREAM_SYSTEM] =
                        MAX_STREAM_VOLUME[AudioSystem.STREAM_SYSTEM];
        }
  • 因此只需要修改 ro.config.system_vol_default 和 ro.config.system_vol_steps 的属性就可，在 build/tools/buildinfo.sh 文件中加入 echo “ro.config.media_vol_steps=28” echo “ro.config.media_vol_default=28” 然后打包编译就可以了，系统默认最大音量就更改好了。
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