Add check_and_install_default_prerequisites so ENV vars are set into the subprocess

Author: misl6

pythonforandroid/prerequisites.py

@@ -216,7 +216,7 @@ def darwin_installer(self):
         os.environ["JAVA_HOME"] = jdk_path
 
 
-if __name__ == "__main__":
+def check_and_install_default_prerequisites():
     DEFAULT_PREREQUISITES = dict(darwin=[JDKPrerequisite()], linux=[], all_platforms=[])
 
     required_prerequisites = (
@@ -242,3 +242,7 @@ def darwin_installer(self):
         prerequisite.show_helper()
         if prerequisite.install_is_supported():
             prerequisite.install()
+
+
+if __name__ == "__main__":
+    check_and_install_default_prerequisites()

pythonforandroid/toolchain.py

@@ -13,6 +13,7 @@
     RECOMMENDED_NDK_API, RECOMMENDED_TARGET_API, print_recommendations)
 from pythonforandroid.util import BuildInterruptingException, load_source
 from pythonforandroid.entrypoints import main
+from pythonforandroid.prerequisites import check_and_install_default_prerequisites
 
 
 def check_python_dependencies():
@@ -66,6 +67,7 @@ def check_python_dependencies():
         exit(1)
 
 
+check_and_install_default_prerequisites()
 check_python_dependencies()