Could not find com.android.tools.build:gradle:4.0.1 ( or any version )

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This solution may only work in Iran. If you know that’s working out of Iran, please let others know.

Why would a proxy be necessary? There have been a number of technology-related sanctions against Iran.

Windows

go to -> File | Settings | Appearance & Behavior | System Settings | HTTP Proxy,
and choose -> manual proxy configuration. set host name: fodev.org
and set port number: 8118. now you must find gradle.properties file. that must be in:
Windows: C:\Users\YOURUSERNAME.gradle\gradle.properties OR for
Linux: ~/.gradle/gradle.properties .
if it does’t exist, create that yourself and copy this:

systemProp.http.proxyHost=fodev.org
systemProp.http.proxyPort=8118
systemProp.http.nonProxyHosts=*.jitpack.io, *.maven.org
systemProp.https.proxyHost=fodev.org
systemProp.https.proxyPort=8118
systemProp.https.nonProxyHosts=*.jitpack.io, *.maven.org

Mac

Open Network settings by  > System Preferences > Network. Then, choose your wifi and click on advanced, which is located on bottom-right of the panel (if there’s a lock at the bottom left of the Network pane, click it to unlock the preference pane). A window would open in which you should go under “Proxies” tab and then check the box for “Web Proxy (HTTP)”. There is a textfield named “Web Proxy Server” in which you should set it to fodev.org and in the next textfield you can enter the port number which is 8118 in this case. The steps may vary depending on the version of macOS and more information about procy server settings can be found on Apple Support Guide. You can also take a look at the screenshot.

macOS proxy settings

The last step is to make sure that have gradle.properties. On finder, choose Go > Go to Folder and then paste ~/.gradle/ and go (alternatively, you can trigger this menu by holding shift + command + G). If you don’t see anyfile under the name ofgradle.properties, create it with textedit or terminal and paste this code there:

systemProp.http.proxyHost=fodev.org
systemProp.http.proxyPort=8118
systemProp.http.nonProxyHosts=*.jitpack.io, *.maven.org
systemProp.https.proxyHost=fodev.org
systemProp.https.proxyPort=8118
systemProp.https.nonProxyHosts=*.jitpack.io, *.maven.org

Now, you can run your project.

IMPORTANT : After installation of build.gradle 4.0.1 (or any version), restore this settings to previous state and remove the codes.

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