手机连接ADB，执行命令

adb shell settings delete global captive_portal_mode

adb shell settings put global captive_portal_mode 0

adb shell settings get global captive_portal_mode

adb shell settings delete global captive_portal_https_url

adb shell settings delete global captive_portal_http_url

adb shell settings put global captive_portal_http_url http://connect.rom.miui.com/generate_204

adb shell settings put global captive_portal_https_url https://connect.rom.miui.com/generate_204

如果手机访问不了网络，或网页打开开不了，可能是手机时间上不对，通过下面方法可解决：

1. 关闭手机自动校准时间，手动将时间改对
2. adb shell "settings put global ntp_server pool.ntp.org"

也可以改为国内时间服务：cn.pool.ntp.org