Android获取蓝牙设备类型

蓝牙设备可能是手机、电脑、耳机、游戏手柄等，我们可以调用如下方法，获取大的设备分类：

bluetoothDevice.getBluetoothClass().getMajorDeviceClass()

返回的设备类型有：

/**
 * Defines all major device class constants.
 * <p>See {@link BluetoothClass.Device} for minor classes.
 */
public static class Major {
    private static final int BITMASK           = 0x1F00;

    public static final int MISC              = 0x0000;
    public static final int COMPUTER          = 0x0100;
    public static final int PHONE             = 0x0200;
    public static final int NETWORKING        = 0x0300;
    public static final int AUDIO_VIDEO       = 0x0400;
    public static final int PERIPHERAL        = 0x0500;
    public static final int IMAGING           = 0x0600;
    public static final int WEARABLE          = 0x0700;
    public static final int TOY               = 0x0800;
    public static final int HEALTH            = 0x0900;
    public static final int UNCATEGORIZED     = 0x1F00;
}