support multiple Activities

src/api-impl-jni/app/android_app_Activity.c

@@ -0,0 +1,99 @@
+#include <gtk/gtk.h>
+
+#include <jni.h>
+
+#include "../defines.h"
+#include "../util.h"
+#include "android_app_Activity.h"
+#include "../generated_headers/android_app_Activity.h"
+
+static GList *activity_backlog = NULL;
+static jobject activity_current = NULL;
+
+static void activity_close(JNIEnv *env, jobject activity) {
+	// in case some exception was left unhandled in native code, print it here so we don't confuse it with an exception thrown by onDestroy
+	if((*env)->ExceptionCheck(env)) {
+		fprintf(stderr, "app_exit: seems there was a pending exception... :");
+		(*env)->ExceptionDescribe(env);
+	}
+
+	/* -- run the main activity's onDestroy -- */
+	(*env)->CallVoidMethod(env, activity, handle_cache.apk_main_activity.onDestroy, NULL);
+	if((*env)->ExceptionCheck(env))
+		(*env)->ExceptionDescribe(env);
+}
+
+static void activity_update_current(JNIEnv *env) {
+	jobject activity_new = activity_backlog ? g_list_first(activity_backlog)->data : NULL;
+
+	if (activity_current != activity_new) {
+		if (activity_current) {
+			(*env)->CallVoidMethod(env, activity_current, handle_cache.apk_main_activity.onPause);
+			if((*env)->ExceptionCheck(env))
+				(*env)->ExceptionDescribe(env);
+
+			(*env)->CallVoidMethod(env, activity_current, handle_cache.apk_main_activity.onStop);
+			if((*env)->ExceptionCheck(env))
+				(*env)->ExceptionDescribe(env);
+		}
+		if (activity_new) {
+			(*env)->CallVoidMethod(env, activity_new, handle_cache.apk_main_activity.onStart);
+			if((*env)->ExceptionCheck(env))
+				(*env)->ExceptionDescribe(env);
+
+			(*env)->CallVoidMethod(env, activity_new, handle_cache.apk_main_activity.onResume);
+			if((*env)->ExceptionCheck(env))
+				(*env)->ExceptionDescribe(env);
+		}
+		activity_current = activity_new;
+	}
+}
+
+void activity_window_ready(void) {
+	JNIEnv *env = get_jni_env();
+
+	for (GList *l = activity_backlog; l != NULL; l = l->next) {
+		(*env)->CallVoidMethod(env, l->data, handle_cache.apk_main_activity.onWindowFocusChanged, true);
+		if((*env)->ExceptionCheck(env))
+			(*env)->ExceptionDescribe(env);
+	}
+}
+
+void activity_close_all(void) {
+	GList *activities, *l;
+	JNIEnv *env = get_jni_env();
+	// local backup of the backlog
+	activities = activity_backlog;
+	// deactivate all activities
+	activity_backlog = NULL;
+	activity_update_current(env);
+	// destroy all activities
+	for (l = activities; l != NULL; l = l->next) {
+		activity_close(env, l->data);
+		_UNREF(l->data);
+	}
+	g_list_free(activities);
+}
+
+void activity_start(JNIEnv *env, jobject activity_object) {
+	/* -- run the activity's onCreate -- */
+	(*env)->CallVoidMethod(env, activity_object, handle_cache.apk_main_activity.onCreate, NULL);
+	if((*env)->ExceptionCheck(env))
+		(*env)->ExceptionDescribe(env);
+
+	activity_backlog = g_list_prepend(activity_backlog, _REF(activity_object));
+	activity_update_current(env);
+}
+
+JNIEXPORT void JNICALL Java_android_app_Activity_nativeFinish(JNIEnv *env, jobject this, jlong window) {
+	activity_backlog = g_list_remove(activity_backlog, this);
+	activity_update_current(env);
+	activity_close(env, this);
+	_UNREF(this);
+	if (activity_backlog == NULL)
+		gtk_window_close(GTK_WINDOW(_PTR(window)));
+}
+
+JNIEXPORT void JNICALL Java_android_app_Activity_nativeStartActivity(JNIEnv *env, jclass class, jobject activity) {
+	activity_start(env, activity);
+}

src/api-impl-jni/app/android_app_Activity.h

@@ -0,0 +1,5 @@
+#include <jni.h>
+
+void activity_start(JNIEnv *env, jobject activity_object);
+void activity_window_ready(void);
+void activity_close_all(void);

src/api-impl-jni/generated_headers/android_app_Activity.h

@@ -0,0 +1,31 @@
+/* DO NOT EDIT THIS FILE - it is machine generated */
+#include <jni.h>
+/* Header for class android_app_Activity */
+
+#ifndef _Included_android_app_Activity
+#define _Included_android_app_Activity
+#ifdef __cplusplus
+extern "C" {
+#endif
+#undef android_app_Activity_MODE_PRIVATE
+#define android_app_Activity_MODE_PRIVATE 0L
+/*
+ * Class:     android_app_Activity
+ * Method:    nativeFinish
+ * Signature: (J)V
+ */
+JNIEXPORT void JNICALL Java_android_app_Activity_nativeFinish
+  (JNIEnv *, jobject, jlong);
+
+/*
+ * Class:     android_app_Activity
+ * Method:    nativeStartActivity
+ * Signature: (Landroid/app/Activity;)V
+ */
+JNIEXPORT void JNICALL Java_android_app_Activity_nativeStartActivity
+  (JNIEnv *, jclass, jobject);
+
+#ifdef __cplusplus
+}
+#endif
+#endif

src/api-impl-jni/util.c

@@ -51,6 +51,8 @@ void set_up_handle_cache(JNIEnv *env)
 	handle_cache.apk_main_activity.onWindowFocusChanged = _METHOD(handle_cache.apk_main_activity.class, "onWindowFocusChanged", "(Z)V");
 	handle_cache.apk_main_activity.onResume = _METHOD(handle_cache.apk_main_activity.class, "onResume", "()V");
 	handle_cache.apk_main_activity.onDestroy = _METHOD(handle_cache.apk_main_activity.class, "onDestroy", "()V");
+	handle_cache.apk_main_activity.onStop = _METHOD(handle_cache.apk_main_activity.class, "onStop", "()V");
+	handle_cache.apk_main_activity.onPause = _METHOD(handle_cache.apk_main_activity.class, "onPause", "()V");
 
 	handle_cache.attribute_set.class = _REF((*env)->FindClass(env, "android/util/AttributeSet"));
 	if((*env)->ExceptionCheck(env))

src/api-impl-jni/util.h

@@ -8,12 +8,13 @@
 struct handle_cache {
 	struct {
 		jclass class;
-		jobject object;
 		jmethodID onCreate;
 		jmethodID onStart;
 		jmethodID onResume;
 		jmethodID onWindowFocusChanged;
 		jmethodID onDestroy;
+		jmethodID onStop;
+		jmethodID onPause;
 	} apk_main_activity;
 	struct {
 		jclass class;
@@ -78,6 +79,8 @@ struct handle_cache {
 
 extern struct handle_cache handle_cache;
 
+JNIEnv * get_jni_env(void);
+
 const char * attribute_set_get_string(JNIEnv *env, jobject attrs, char *attribute, char *schema);
 int attribute_set_get_int(JNIEnv *env, jobject attrs, char *attribute, char *schema, int default_value);
 void set_up_handle_cache(JNIEnv *env);