Factor out JNI service entry point

This will be reused for WorkManager task entry points in a later commit.

Author: dbnicholson

pythonforandroid/bootstraps/common/build/jni/application/src/start.c

@@ -354,7 +354,7 @@ int SDL_main(int argc, char *argv[]) {
 }
 #endif
 
-JNIEXPORT int JNICALL Java_org_kivy_android_PythonService_nativeStart(
+static int native_service_start(
     JNIEnv *env,
     jobject thiz,
     jstring j_android_private,
@@ -397,6 +397,28 @@ JNIEXPORT int JNICALL Java_org_kivy_android_PythonService_nativeStart(
   return run_python(1, argv);
 }
 
+JNIEXPORT int JNICALL Java_org_kivy_android_PythonService_nativeStart(
+    JNIEnv *env,
+    jobject thiz,
+    jstring j_android_private,
+    jstring j_android_argument,
+    jstring j_service_entrypoint,
+    jstring j_python_name,
+    jstring j_python_home,
+    jstring j_python_path,
+    jstring j_arg) {
+  LOGP("Entering org.kivy.android.PythonService.nativeStart");
+  return native_service_start(env,
+                              thiz,
+                              j_android_private,
+                              j_android_argument,
+                              j_service_entrypoint,
+                              j_python_name,
+                              j_python_home,
+                              j_python_path,
+                              j_arg);
+}
+
 #if defined(BOOTSTRAP_NAME_WEBVIEW) || defined(BOOTSTRAP_NAME_SERVICEONLY)
 // Webview and service_only uses some more functions: