Android13修改多媒体默认音量

干就完了!

设置音量为最大音量,修改如下:

/framework/base/media/java/android/media/AudioSystem.java/** @hide */public static int[] DEFAULT_STREAM_VOLUME = new int[] {4,  // STREAM_VOICE_CALL7,  // STREAM_SYSTEM5,  // STREAM_RING-5, // STREAM_MUSIC+15, // STREAM_MUSIC6,  // STREAM_ALARM5,  // STREAM_NOTIFICATION7,  // STREAM_BLUETOOTH_SCO7,  // STREAM_SYSTEM_ENFORCED5, // STREAM_DTMF5, // STREAM_TTS5, // STREAM_ACCESSIBILITY5, // STREAM_ASSISTANT};

你一定会问,为啥是15而不是其他数字呢? good question  接下往下读

//framework/base/services/core/java/com/android/server/audio/AudioService.java
//各个类型的最大值
/** Maximum volume index values for audio streams */protected static int[] MAX_STREAM_VOLUME = new int[] {5,  // STREAM_VOICE_CALL7,  // STREAM_SYSTEM7,  // STREAM_RING15, // STREAM_MUSIC7,  // STREAM_ALARM7,  // STREAM_NOTIFICATION15, // STREAM_BLUETOOTH_SCO7,  // STREAM_SYSTEM_ENFORCED15, // STREAM_DTMF15, // STREAM_TTS15, // STREAM_ACCESSIBILITY15  // STREAM_ASSISTANT};//各个类型的最大值/** Minimum volume index values for audio streams */protected static int[] MIN_STREAM_VOLUME = new int[] {1,  // STREAM_VOICE_CALL0,  // STREAM_SYSTEM0,  // STREAM_RING0,  // STREAM_MUSIC1,  // STREAM_ALARM0,  // STREAM_NOTIFICATION0,  // STREAM_BLUETOOTH_SCO0,  // STREAM_SYSTEM_ENFORCED0,  // STREAM_DTMF0,  // STREAM_TTS1,  // STREAM_ACCESSIBILITY0   // STREAM_ASSISTANT};

这是系统枚举的最大最小值

Android不同的版本,存在的类可能不一致,但是思路是一致的

OVER~