Android: Fix after activity is recreated, you can't use on screen keyboard or go ingame anymore

android/app/src/main/java/com/classicube/MainActivity.java

@@ -193,6 +193,8 @@ public class MainActivity extends Activity {
 		HACK_avoidFileUriExposedErrors();
 
 		if (!gameRunning) startGameAsync();
+		// TODO rethink to avoid this
+		if (gameRunning) updateInstance();
 		super.onCreate(savedInstanceState);
 	}
 
@@ -382,6 +384,7 @@ public class MainActivity extends Activity {
 	native void processOnLowMemory();
 	
 	native void runGameAsync();
+	native void updateInstance();
 	
 	// ======================================
 	// --------------- VIEWS ----------------

src/Platform_Android.c

@@ -198,4 +198,45 @@ void JavaCall_String_String(const char* name, const cc_string* arg, cc_string* d
 	ReturnString(env, obj, dst);
 	(*env)->DeleteLocalRef(env, args[0].l);
 }
+
+
+/*########################################################################################################################*
+*----------------------------------------------------Initialisation-------------------------------------------------------*
+*#########################################################################################################################*/
+extern void android_main(void);
+static void JNICALL java_updateInstance(JNIEnv* env, jobject instance) {
+	Platform_LogConst("App instance updated!");
+	App_Instance = (*env)->NewGlobalRef(env, instance);
+	/* TODO: Do we actually need to remove that global ref later? */
+}
+
+/* Called eventually by the activity java class to actually start the game */
+static void JNICALL java_runGameAsync(JNIEnv* env, jobject instance) {
+	void* thread;
+	java_updateInstance(env, instance);
+
+	Platform_LogConst("Running game async!");
+	/* The game must be run on a separate thread, as blocking the */
+	/* main UI thread will cause a 'App not responding..' messagebox */
+	thread = Thread_Start(android_main);
+	Thread_Detach(thread);
+}
+static const JNINativeMethod methods[] = {
+	{ "updateInstance", "()V", java_updateInstance },
+	{ "runGameAsync",   "()V", java_runGameAsync }
+};
+
+/* This method is automatically called by the Java VM when the */
+/*  activity java class calls 'System.loadLibrary("classicube");' */
+CC_API jint JNI_OnLoad(JavaVM* vm, void* reserved) {
+	jclass klass;
+	JNIEnv* env;
+	VM_Ptr = vm;
+	JavaGetCurrentEnv(env);
+
+	klass     = (*env)->FindClass(env, "com/classicube/MainActivity");
+	App_Class = (*env)->NewGlobalRef(env, klass);
+	JavaRegisterNatives(env, methods);
+	return JNI_VERSION_1_4;
+}
 #endif

src/Program.c

@@ -123,42 +123,13 @@ int main_real(int argc, char** argv) {
 #elif defined CC_BUILD_ANDROID
 /* ClassiCube is just a native library on android, */
 /*  unlike other platforms where it is the executable. */
-/* (activity java class is responsible for kickstarting the game) */
-static void android_main(void) {
+/* (activity java class is responsible for kickstarting the game,
+    see Platform_Android.c for the code that actually calls this) */
+void android_main(void) {
 	Platform_LogConst("Main loop started!");
 	SetupProgram(0, NULL);
 	for (;;) { RunProgram(0, NULL); }
 }
-
-/* Called eventually by the activity java class to actually start the game */
-static void JNICALL java_runGameAsync(JNIEnv* env, jobject instance) {
-	void* thread;
-	App_Instance = (*env)->NewGlobalRef(env, instance);
-	/* TODO: Do we actually need to remove that global ref later? */
-
-	Platform_LogConst("Running game async!");
-	/* The game must be run on a separate thread, as blocking the */
-	/* main UI thread will cause a 'App not responding..' messagebox */
-	thread = Thread_Start(android_main);
-	Thread_Detach(thread);
-}
-static const JNINativeMethod methods[] = {
-	{ "runGameAsync", "()V", java_runGameAsync }
-};
-
-/* This method is automatically called by the Java VM when the */
-/*  activity java class calls 'System.loadLibrary("classicube");' */
-CC_API jint JNI_OnLoad(JavaVM* vm, void* reserved) {
-	jclass klass;
-	JNIEnv* env;
-	VM_Ptr = vm;
-	JavaGetCurrentEnv(env);
-
-	klass     = (*env)->FindClass(env, "com/classicube/MainActivity");
-	App_Class = (*env)->NewGlobalRef(env, klass);
-	JavaRegisterNatives(env, methods);
-	return JNI_VERSION_1_4;
-}
 #else
 /* NOTE: main_real is used for when compiling with MingW without linking to startup files. */
 /*  Normally, the final code produced for "main" is our "main" combined with crt's main */

src/Window_Android.c

@@ -261,7 +261,7 @@ void Window_Init(void) {
 	DisplayInfo.ScaleY = JavaICall_Float(env, JAVA_getDpiY, NULL);
 }
 
-static void Window_RemakeSurface(void) {
+static void RemakeWindowSurface(void) {
 	JNIEnv* env;
 	JavaGetCurrentEnv(env);
 	winCreated = false;
@@ -272,6 +272,7 @@ static void Window_RemakeSurface(void) {
 	Platform_LogConst("Entering wait for window exist loop..");
 
 	/* Loop until window gets created by main UI thread */
+	/* (i.e. until processSurfaceCreated is received) */
 	while (!winCreated) {
 		Window_ProcessEvents();
 		Thread_Sleep(10);
@@ -282,8 +283,7 @@ static void Window_RemakeSurface(void) {
 
 static void DoCreateWindow(void) {
 	WindowInfo.Exists = true;
-	/* actual window creation is done when processSurfaceCreated is received */
-	Window_RemakeSurface();
+	RemakeWindowSurface();
 	/* always start as fullscreen */
 	Window_EnterFullscreen();
 }