diff --git a/pythonforandroid/bootstraps/common/build/build.py b/pythonforandroid/bootstraps/common/build/build.py
index 8eb1a6fe0e..fc8c8b43ce 100644
--- a/pythonforandroid/bootstraps/common/build/build.py
+++ b/pythonforandroid/bootstraps/common/build/build.py
@@ -380,6 +380,9 @@ def make_package(args):
         for spec in args.extra_source_dirs:
             if ':' in spec:
                 specdir, specincludes = spec.split(':')
+                print('WARNING: Currently gradle builds only support including source '
+                      'directories, so when building using gradle all files in '
+                      '{} will be included.'.format(specdir))
             else:
                 specdir = spec
                 specincludes = '**'
diff --git a/pythonforandroid/bootstraps/common/build/templates/build.tmpl.gradle b/pythonforandroid/bootstraps/common/build/templates/build.tmpl.gradle
index 7b6ba8390b..2b0c540f06 100644
--- a/pythonforandroid/bootstraps/common/build/templates/build.tmpl.gradle
+++ b/pythonforandroid/bootstraps/common/build/templates/build.tmpl.gradle
@@ -85,6 +85,13 @@ android {
     sourceSets {
         main {
             jniLibs.srcDir 'libs'
+            java {
+
+                {%- for adir, pattern in args.extra_source_dirs -%}
+                    srcDir '{{adir}}'
+                {%- endfor -%}
+
+            }
         }
     }