add jni

Author: damlayildiz

src/android_https_call.c

@@ -1,6 +1,50 @@
 #include <stdio.h>
+#include <jni.h>
 #include "android_https_call.h"
 
 void make_android_https_call(void) {
-    printf("Basic test running...\n");
+    JavaVM *vms[1];
+    jsize num_vms;
+    JNIEnv *env = NULL;
+
+    // Get the Java VM (assumes one has been created)
+    if (JNI_GetCreatedJavaVMs(vms, 1, &num_vms) != JNI_OK || num_vms == 0) {
+        printf("No Java VM available\n");
+        return;
+    }
+
+    JavaVM *jvm = vms[0];
+
+    // Attach the current thread to the JVM
+    if ((*jvm)->AttachCurrentThread(jvm, (void**)&env, NULL) != JNI_OK) {
+        printf("Failed to attach current thread to JVM\n");
+        return;
+    }
+
+    // Locate the HttpsCaller class
+    jclass cls = (*env)->FindClass(env, "HttpsCaller");
+    if (cls == NULL) {
+        printf("Could not find HttpsCaller class\n");
+        (*jvm)->DetachCurrentThread(jvm);
+        return;
+    }
+
+    // Find the static method ID for `callHttps`
+    jmethodID mid = (*env)->GetStaticMethodID(env, cls, "callHttps", "()Ljava/lang/String;");
+    if (mid == NULL) {
+        printf("Could not find method callHttps\n");
+        (*jvm)->DetachCurrentThread(jvm);
+        return;
+    }
+
+    // Call the static method
+    jstring result = (jstring)(*env)->CallStaticObjectMethod(env, cls, mid);
+
+    // Convert Java string to C string
+    const char *str = (*env)->GetStringUTFChars(env, result, NULL);
+    printf("HTTPS result: %s\n", str);
+    (*env)->ReleaseStringUTFChars(env, result, str);
+
+    // Detach thread from JVM
+    (*jvm)->DetachCurrentThread(jvm);
 }