Host name may not be empty

Question

After upgrading my Android Studio, I got this error whenever I wanted to generate a signed Apk (without any detail of where the problem is). There was no problem when I just built Apk.

The Host name may not be empty

Answer 1

Check your Gradle scripts root. If there is this file: gradle.properties (Global Properties), check that values are correct.

In my case, I removed all these properties and my problem solved

systemProp.http.proxyHost=
systemProp.http.proxyPort=80
systemProp.https.proxyHost=
systemProp.https.proxyPort=80

Answer 2

It may be problem with uploadMappingFile

Set the firebaseCrashlytics.enableMappingFileUpload Gradle extension property to true in your app-level build.gradle file.

// To enable Crashlytics mapping file upload for specific product flavors:
  flavorDimensions "environment"
  productFlavors {
    staging {
      dimension "environment"
      ...
      firebaseCrashlytics {
        mappingFileUploadEnabled false
      }
    }
    prod {
      dimension "environment"
      ...
      firebaseCrashlytics {
        mappingFileUploadEnabled true
      }
    }
  }

for more details visit here

Answer 3

Yep, problem started at AS 4.0 up.. Here are the clearer fixes... (Cos Some may think the "gradle.properties" file being talked about here is what is in the AS project instead of the global one.

Delete the following lines from the "gradle.propeties" file on your PC gradle installation location

systemProp.http.proxyHost= systemProp.https.proxyHost= systemProp.https.proxyPort=80 systemProp.http.proxyPort=80

as seen in n my picture below here is a typical file location of this gradle.propeties file

Now click rebuild in your project and VIOLA... Problem solved