android 默认系统音量定义-优快云博客

本文详细解析了MTK8.1系统中音量的最大值、最小值及默认值设置，包括VOICE_CALL、SYSTEM、RING、MUSIC等不同音频流类型的音量控制参数。

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OS:MTK 8.1

1.音量最大值

frameworks/base/services/core/java/com/android/server/audio/AudioService.java

 /** @hide Maximum volume index values for audio streams */
    private int[] MAX_STREAM_VOLUME = new int[] {
        7,  // STREAM_VOICE_CALL
        15, // STREAM_SYSTEM
        15, // STREAM_RING
        15, // STREAM_MUSIC
        15, // STREAM_ALARM
        15, // STREAM_NOTIFICATION
        15, // STREAM_BLUETOOTH_SCO
        15, // STREAM_SYSTEM_ENFORCED
        15, // STREAM_DTMF
        15, // STREAM_TTS
        
    };

2.音量最小值

/** @hide Minimum volume index values for audio streams */
    private int[] MIN_STREAM_VOLUME = new int[] {
        1,  // STREAM_VOICE_CALL
        0, // STREAM_SYSTEM
        0, // STREAM_RING
        0, // STREAM_MUSIC
        0, // STREAM_ALARM
        0, // STREAM_NOTIFICATION
        0, // STREAM_BLUETOOTH_SCO
        0, // STREAM_SYSTEM_ENFORCED
        0, // STREAM_DTMF
        0, // STREAM_TTS
        
    };

3.音量默认值

frameworks/base/media/java/android/media/AudioSystem.java

/** default volume index values for audio streams */
	 private int[] DEFAULT_STREAM_VOLUME = new int[] {
        4,  // STREAM_VOICE_CALL
        7, // STREAM_SYSTEM
        5, // STREAM_RING
        11, // STREAM_MUSIC
        6, // STREAM_ALARM
        5, // STREAM_NOTIFICATION
        7, // STREAM_BLUETOOTH_SCO
        7, // STREAM_SYSTEM_ENFORCED
        11, // STREAM_DTMF
        11, // STREAM_TTS
        
    };