Android触摸touchevent的AB两种方式（TYPE_A,TYPE_B）识别方法

通过下面命令行查看手机的event数据：

adb shell getevent -lp

找到ABS行，看后面ABS命令中有没有ABS_MT_SLOT，没有的话是TYPE_A,有的话是TYPE_B.

下面是抓取的手上几个手机（还有一个HUAWEI平板）的数据：

HUAWEI：TOUCH_TYPE_A(ok)
    ABS (0003): ABS_X                 : value 0, min 0, max 1439, fuzz 0, flat 0, resolution 0
                ABS_Y                 : value 0, min 0, max 2559, fuzz 0, flat 0, resolution 0
                ABS_PRESSURE          : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
                ABS_MT_WIDTH_MAJOR    : value 0, min 0, max 100, fuzz 0, flat 0, resolution 0
                ABS_MT_WIDTH_MINOR    : value 0, min 0, max 100, fuzz 0, flat 0, resolution 0
                ABS_MT_POSITION_X     : value 0, min 0, max 1439, fuzz 0, flat 0, resolution 0
                ABS_MT_POSITION_Y     : value 0, min 0, max 2559, fuzz 0, flat 0, resolution 0
                ABS_MT_TRACKING_ID    : value 0, min 0, max 15, fuzz 0, flat 0, resolution 0
                ABS_MT_PRESSURE       : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0

MEIZU:TOUCH_TYPE_B(ok)
    ABS (0003): ABS_X                 : value 0, min 0, max 1080, fuzz 0, flat 0, resolution 1080
                ABS_Y                 : value 0, min 0, max 1920, fuzz 0, flat 0, resolution 1920
                ABS_PRESSURE          : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
                ABS_MT_SLOT           : value 0, min 0, max 9, fuzz 0, flat 0, resolution 0
                ABS_MT_TOUCH_MAJOR    : value 0, min 0, max 100, fuzz 0, flat 0, resolution 0
                ABS_MT_TOUCH_MINOR    : value 0, min 0, max 100, fuzz 0, flat 0, resolution 0
                ABS_MT_POSITION_X     : value 0, min 0, max 1080, fuzz 0, flat 0, resolution 0
                ABS_MT_POSITION_Y     : value 0, min 0, max 1920, fuzz 0, flat 0, resolution 0
                ABS_MT_TRACKING_ID    : value 0, min 0, max 10, fuzz 0, flat 0, resolution 0
                ABS_MT_PRESSURE       : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0

XIAOMI:TOUCH_TYPE_B(ok)
    ABS (0003): ABS_MT_SLOT           : value 0, min 0, max 9, fuzz 0, flat 0, resolution 0
                ABS_MT_TOUCH_MAJOR    : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
                ABS_MT_POSITION_X     : value 0, min 0, max 1079, fuzz 0, flat 0, resolution 0
                ABS_MT_POSITION_Y     : value 0, min 0, max 2279, fuzz 0, flat 0, resolution 0
                ABS_MT_TRACKING_ID    : value 0, min 0, max 65535, fuzz 0, flat 0, resolution 0
                ABS_MT_PRESSURE       : value 0, min 0, max 1000, fuzz 0, flat 0, resolution 0

JIANGUO:TOUCH_TYPE_B(ok)
    ABS (0003): ABS_X                 : value 0, min 0, max 1079, fuzz 0, flat 0, resolution 0
                ABS_Y                 : value 0, min 0, max 2159, fuzz 0, flat 0, resolution 0
                ABS_MT_SLOT           : value 0, min 0, max 9, fuzz 0, flat 0, resolution 0
                ABS_MT_TOUCH_MAJOR    : value 0, min 0, max 27, fuzz 0, flat 0, resolution 0
                ABS_MT_TOUCH_MINOR    : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
                ABS_MT_POSITION_X     : value 0, min 0, max 1079, fuzz 0, flat 0, resolution 0
                ABS_MT_POSITION_Y     : value 0, min 0, max 2159, fuzz 0, flat 0, resolution 0
                ABS_MT_TRACKING_ID    : value 0, min 0, max 65535, fuzz 0, flat 0, resolution 0
HUAWEI PINGBAN:TOUCH_TYPE_B(ok)
    ABS (0003): ABS_MT_SLOT           : value 0, min 0, max 31, fuzz 0, flat 0, resolution 0
                ABS_MT_TOUCH_MAJOR    : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
                ABS_MT_TOUCH_MINOR    : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
                ABS_MT_ORIENTATION    : value 0, min -297, max 127, fuzz 0, flat 0, resolution 0
                ABS_MT_POSITION_X     : value 0, min 0, max 1599, fuzz 0, flat 0, resolution 0
                ABS_MT_POSITION_Y     : value 0, min 0, max 2559, fuzz 0, flat 0, resolution 0
                ABS_MT_TRACKING_ID    : value 0, min 0, max 65535, fuzz 0, flat 0, resolution 0
                ABS_MT_PRESSURE       : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0

AB类型的区别说明见

kernel/Documentation/input/multi-touch-protocol.txt