主要是GFW的问题

 

adb shell以下命令解决

settings put global captive_portal_detection_enabled 1
settings put global captive_portal_mode 1
settings put global captive_portal_use_https 0
settings put global captive_portal_server connect.rom.miui.com
settings put global captive_portal_http_url http://connect.rom.miui.com/generate_204
settings put global captive_portal_https_url https://connect.rom.miui.com/generate_204

注，需要切换飞行模式生效