Android Studio: Gradle sync failed: Connection tim

问题:

My Android Studio was working fine till morning, but since tonight I get error saying "Gradle sync failed: Connection timed out: connect. If you are behind an HTTP proxy, please configure the proxy settings either in IDE or Gradle.". I am not using any proxy server. Even the option for HTTP proxy is set to "no proxy". I have no idea how to get this working. I tried giving public access to Android Studio in firewall but it didn't work.

Any help/solution is welcome.

P.S. My Android Studio version is 2.2.3

Thank you!

回答1:

I think it's a network issue. My project currently fails to build unless I pass the --offline argument to gradle. I think the S3 outage is impacting repos hosting dependencies.

Try ./gradlew tasks --offline

Or, to make android studio run in offline mode, follow the instructions: https://stackoverflow.com/a/32173577/1043518

回答2:

I copied a project that was created else where. After removing these proxy credentials:

systemProp.http.proxyPassword=your_password

systemProp.http.proxyHost=host_Ip_address

systemProp.http.proxyUser=your_username

systemProp.http.proxyPort=port_number

in the gradle.properties, it worked like a charm.

回答3:

For me it was the firewall. Definitely, only that. After adding Android Studio to it's whitelist everything is working like a charm.

回答4:

Do not forget proxy for https in gradle.properties

systemProp.http.proxyHost=your.proxy.host
systemProp.http.proxyPort=8080
systemProp.http.proxyUser=username
systemProp.http.proxyPassword=password
#
# DO NOT forget https proxy, too!
#
systemProp.https.proxyHost=your.proxy.host
systemProp.https.proxyPort=8080
systemProp.https.proxyUser=username
systemProp.https.proxyPassword=password

回答5:

If your Proxy settings is set to No Proxy [Based on how i solved this issue in my case] check out gradle.properties (Global properties) and clear proxy lines.

#systemProp.https.proxyPort=port
#systemProp.http.proxyHost=proxy
org.gradle.jvmargs=-Xmx2048m -XX\:MaxPermSize\=512m -XX\:+HeapDumpOnOutOfMemoryError -Dfile.encoding\=UTF-8 -Djava.net.preferIPv4Stack\=true
org.gradle.daemon=true
#systemProp.https.proxyHost=proxy
org.gradle.configureondemand=false
#systemProp.http.proxyPort=port
android.enableBuildCache=true

回答6:

It can be a network issue sometimes. You can try to resolve it by turning off your "Firewall Protection". Also you need to turn off Firewall Protection from Antivirus.

回答7:

I solved my problem by turning off my anti-virus (avast)

回答8:

If proxy settings are correct then go to file and click on "Invalidate Caches/Restart..." to invalidate the cache and restart android studio.

回答9:

I solved it by executing cleanBuildCache in android studio

open Gradle projects tab in the right top corner of android studio under build folder double click on cleanBuildCache and then run you project

回答10:

There are several countries that their IP's are blocked by Android Studio so if you feel your IP is one of them just simply connect to a VPN service.