From 391bc026ce12bf86721bb3aa4484cbbf4b657e32 Mon Sep 17 00:00:00 2001
From: Kronka <33985574+Kronka@users.noreply.github.com>
Date: Sat, 17 Apr 2021 20:13:21 +0300
Subject: [PATCH 1/4] add const char* AndroidGetExternalFilesDir()

---
 CNFGEGLDriver.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/CNFGEGLDriver.c b/CNFGEGLDriver.c
index 4faeafc..a67ae7f 100644
--- a/CNFGEGLDriver.c
+++ b/CNFGEGLDriver.c
@@ -559,6 +559,29 @@ void AndroidMakeFullscreen()
 	jnii->DetachCurrentThread( jniiptr );
 }
 
+const char* AndroidGetExternalFilesDir()
+{
+	const struct JNINativeInterface * env = 0;
+	const struct JNINativeInterface ** envptr = &env;
+	const struct JNIInvokeInterface ** jniiptr = gapp->activity->vm;
+	const struct JNIInvokeInterface * jnii = *jniiptr;
+
+	jnii->AttachCurrentThread( jniiptr, &envptr, NULL);
+	env = (*envptr);
+	jclass activityClass = env->FindClass( envptr, "android/app/NativeActivity");
+	jobject lNativeActivity = gapp->activity->clazz;
+
+    	jmethodID mid_getExtStorage = env->GetMethodID(envptr,activityClass,"getExternalFilesDir", "(Ljava/lang/String;)Ljava/io/File;");
+    	jobject obj_File = env->CallObjectMethod(envptr,lNativeActivity, mid_getExtStorage, NULL);
+    	jclass cls_File = env->FindClass(envptr,"java/io/File");
+    	jmethodID mid_getPath = env->GetMethodID(envptr,cls_File, "getPath", "()Ljava/lang/String;");
+    	jstring obj_Path = (jstring) env->CallObjectMethod(envptr,obj_File, mid_getPath);
+    	const char* path = env->GetStringUTFChars(envptr,obj_Path, NULL);
+    	//printf("EXTERNAL PATH = %s\n", path);
+    	env->ReleaseStringUTFChars(envptr,obj_Path, path);	
+	jnii->DetachCurrentThread( jniiptr );
+	return path;
+}
 
 void AndroidDisplayKeyboard(int pShow)
 {

From 8ffa1bff07ff0c9ace16721933ce0bdb4b24c153 Mon Sep 17 00:00:00 2001
From: Kronka <33985574+Kronka@users.noreply.github.com>
Date: Sat, 17 Apr 2021 20:14:11 +0300
Subject: [PATCH 2/4] add const char* AndroidGetExternalFilesDir();

---
 CNFGAndroid.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CNFGAndroid.h b/CNFGAndroid.h
index ff51dd5..2e72f3c 100644
--- a/CNFGAndroid.h
+++ b/CNFGAndroid.h
@@ -6,6 +6,7 @@
 
 extern struct android_app * gapp;
 void AndroidMakeFullscreen();
+const char* AndroidGetExternalFilesDir();
 int AndroidHasPermissions(const char* perm_name);
 void AndroidRequestAppPermissions(const char * perm);
 void AndroidDisplayKeyboard(int pShow);

From 660cd85461170f099640ff708f823cc58ee3377f Mon Sep 17 00:00:00 2001
From: Kronka <33985574+Kronka@users.noreply.github.com>
Date: Sat, 17 Apr 2021 20:16:34 +0300
Subject: [PATCH 3/4] Update simple.c

---
 simple.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/simple.c b/simple.c
index bd94148..50a1cbb 100644
--- a/simple.c
+++ b/simple.c
@@ -61,3 +61,27 @@ int main()
 		CNFGSwapBuffers();		
 	}
 }
+
+//writes the text to a file to path (example): /storage/emulated/0/Android/data/org.yourcompany.name/
+void Log(const char *fmt, ...)
+{
+	const char* getpath = AndroidGetExternalFilesDir();
+	char buffer[0xFF];
+	sprintf(buffer, "%s/log.txt", getpath);
+	FILE *f = fopen(buffer, "w");
+	if (f == NULL)
+	{
+		exit(1);
+	}
+	
+	memset(buffer, 0, sizeof(buffer));
+
+	va_list arg;
+	va_start(arg, fmt);
+	vsnprintf(buffer, sizeof(buffer), fmt, arg);
+	va_end(arg);	
+
+	fprintf(f, "%s\n", buffer);
+
+	fclose(f);
+}

From 2b4301270ed354897171871620715700bf0c221d Mon Sep 17 00:00:00 2001
From: Kronka <33985574+Kronka@users.noreply.github.com>
Date: Sat, 17 Apr 2021 20:17:35 +0300
Subject: [PATCH 4/4] Update simple.c

---
 simple.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/simple.c b/simple.c
index 50a1cbb..97cefa2 100644
--- a/simple.c
+++ b/simple.c
@@ -10,9 +10,13 @@ void HandleKey( int keycode, int bDown ) { }
 void HandleButton( int x, int y, int button, int bDown ) { }
 void HandleMotion( int x, int y, int mask ) { }
 void HandleDestroy() { }
+
+void Log(const char *fmt, ...);
+
 int main()
 {
 	CNFGSetup( "Example App", 1024, 768 );
+	Log("Main started");
 	while(1)
 	{
 		CNFGBGColor = 0x000080ff; //Dark Blue Background