Gradle: Run the clean task before anything else to make sure nothing is cached.

Author: misl6

pythonforandroid/toolchain.py

@@ -1108,7 +1108,10 @@ def _build_package(self, args, package_type):
             else:
                 raise BuildInterruptingException(
                     "Unknown build mode {} for apk()".format(args.build_mode))
-            output = shprint(gradlew, gradle_task, _tail=20,
+
+            # WARNING: We should make sure to clean the build directory before building.
+            # Looks like our private.tar is causing issues to gradle.
+            output = shprint(gradlew, "clean", gradle_task, _tail=20,
                              _critical=True, _env=env)
         return output, build_args