Android AudioManager修改设备默认音量

Android 4.4：

修改AudioManager中的默认音量数组：

frameworks/base/media/java/android/media/AudioManager.java

    public static final int[] DEFAULT_STREAM_VOLUME = new int[] {        4, // STREAM_VOICE_CALL        7, // STREAM_SYSTEM        4, // STREAM_RING        8, // STREAM_MUSIC        4, // STREAM_ALARM        4, // STREAM_NOTIFICATION        7, // STREAM_BLUETOOTH_SCO        7, // STREAM_SYSTEM_ENFORCED        11, // STREAM_DTMF        11, // STREAM_TTS        4, // STREAM_FM        4 // STREAM_MATV    };

Android 5.1：

AudioManager中没有4.4中的DEFAULT_STREAM_VOLUME 数组，移动到了AudioService：

frameworks/base/media/java/android/media/AudioService.java

    /**     * @hide Default volume index values for audio streams     * M: modify the default stream volume @{     */    public static int[] DEFAULT_STREAM_VOLUME = new int[] {        4,  // STREAM_VOICE_CALL        15,  // STREAM_SYSTEM        8,  // STREAM_RING        8, // STREAM_MUSIC        8,  // STREAM_ALARM        8,  // STREAM_NOTIFICATION        7,  // STREAM_BLUETOOTH_SCO        15,  // STREAM_SYSTEM_ENFORCED        11, // STREAM_DTMF        11,  // STREAM_TTS    };    /** @ */

附：最大音量

   /** @hide Maximum volume index values for audio streams */   /// M: Modify the max stream volume @{    private static final int[] MAX_STREAM_VOLUME = new int[] {        6,  // 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    };    /// @}

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