MTK 音量加减键修改为默认控制媒体音量

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

    private int getActiveStreamType(int suggestedStreamType) {
        switch (mPlatformType) {
        case PLATFORM_VOICE:
            if (isInCommunication()) {
                if (AudioSystem.getForceUse(AudioSystem.FOR_COMMUNICATION)
                        == AudioSystem.FORCE_BT_SCO) {
                    // Log.v(TAG, "getActiveStreamType: Forcing STREAM_BLUETOOTH_SCO...");
                    return AudioSystem.STREAM_BLUETOOTH_SCO;
                } else {
                    // Log.v(TAG, "getActiveStreamType: Forcing STREAM_VOICE_CALL...");
                    return AudioSystem.STREAM_VOICE_CALL;
                }
            } else if (suggestedStreamType == AudioManager.USE_DEFAULT_STREAM_TYPE) {
                if (isAfMusicActiveRecently(StreamOverride.sDelayMs)) {
                    if (DEBUG_VOL)
                        Log.v(TAG, "getActiveStreamType: Forcing STREAM_MUSIC stream active");
                    return AudioSystem.STREAM_MUSIC;
                    } else {
                        if (DEBUG_VOL)
                            Log.v(TAG, "getActiveStreamType: Forcing STREAM_RING b/c default");
                        //MYRON
                        //return AudioSystem.STREAM_RING;
                        //Log.v(TAG, "[ZHOUXUEWEI] return AudioSystem.STREAM_MUSIC!");
                        return AudioSystem.STREAM_MUSIC;
                }
            } else if (isAfMusicActiveRecently(0)) {
                if (DEBUG_VOL)
                    Log.v(TAG, "getActiveStreamType: Forcing STREAM_MUSIC stream active");
                return AudioSystem.STREAM_MUSIC;
            }
            break;
        case PLATFORM_TELEVISION:
            if (suggestedStreamType == AudioManager.USE_DEFAULT_STREAM_TYPE) {
                    // TV always defaults to STREAM_MUSIC
                    return AudioSystem.STREAM_MUSIC;
            }
            break;