I'm working behind a proxy and i have this problem when i run muy flutter app in android studio 3.2
Launching lib\main.dart on LGMS323 in debug mode... Initializing gradle... Finished with error: Exit code 1 from: D:\Android\Flutter\Mis_Proyectos\flutter_app\android\gradlew.bat -v: Downloading https://services.gradle.org/distributions/gradle-4.4-all.zip Exception in thread "main" java.net.UnknownHostException: services.gradle.org at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184) at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:673) at sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:173) at sun.net.NetworkClient.doConnect(NetworkClient.java:180) at sun.net.www.http.HttpClient.openServer(HttpClient.java:432) at sun.net.www.http.HttpClient.openServer(HttpClient.java:527) at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:264) at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:367) at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191) at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1138) at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1032) at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177) at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1546) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474) at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254) at org.gradle.wrapper.Download.downloadInternal(Download.java:58) at org.gradle.wrapper.Download.download(Download.java:44) at org.gradle.wrapper.Install$1.call(Install.java:61) at org.gradle.wrapper.Install$1.call(Install.java:48) at org.gradle.wrapper.ExclusiveFileAccessManager.access(ExclusiveFileAccessManager.java:65) at org.gradle.wrapper.Install.createDist(Install.java:48) at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:128) at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61) And when I change in android/gradle/wraper/gradle-graper.properitis:
distributionUrl=https://services.gradle.org/distributions/gradle-4.4-all.zip
for
distributionUrl=D:\Android\Gradle/gradle-4.6-all.zip
this happens:
Launching lib\main.dart on LGMS323 in debug mode... Initializing gradle... Finished with error: Exit code 1 from: D:\Android\Flutter\Mis_Proyectos\flutter_app22222222\android\gradlew.bat -v: Exception in thread "main" java.lang.NullPointerException at org.gradle.wrapper.PathAssembler.getDistName(PathAssembler.java:84) at org.gradle.wrapper.PathAssembler.getDistribution(PathAssembler.java:40) at org.gradle.wrapper.Install.createDist(Install.java:44) at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:128) at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61) 
