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
