获取byte的高四位和低四位

1.

public static int getHeight4(byte data){//获取高四位
    int height;
    height = ((data & 0xf0) >> 4);
    return height;
}

public static int getLow4(byte data){//获取低四位
    int low;
    low = (data & 0x0f);
    return low;
}