Fix crash on Linux

{{cookiecutter.out_dir}}/linux/CMakeLists.txt

@@ -138,6 +138,12 @@ foreach(plugin ${FLUTTER_PLUGIN_LIST})
   endif()
 endforeach(plugin)
 
+# Copy the native assets provided by the build.dart from all packages.
+set(NATIVE_ASSETS_DIR "${PROJECT_BUILD_DIR}native_assets/linux/")
+install(DIRECTORY "${NATIVE_ASSETS_DIR}"
+   DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+   COMPONENT Runtime)
+
 # Fully re-copy the assets directory on each build to avoid having stale files
 # from a previous install.
 set(FLUTTER_ASSET_DIR_NAME "flutter_assets")

{{cookiecutter.out_dir}}/linux/my_application.cc

@@ -7,8 +7,7 @@
 
 #include "flutter/generated_plugin_registrant.h"
 
-struct _MyApplication
+struct _MyApplication {
-{
   GtkApplication parent_instance;
   char** dart_entrypoint_arguments;
 };
@@ -16,8 +15,7 @@ struct _MyApplication
 G_DEFINE_TYPE(MyApplication, my_application, GTK_TYPE_APPLICATION)
 
 // Implements GApplication::activate.
-static void my_application_activate(GApplication *application)
+static void my_application_activate(GApplication* application) {
-{
   MyApplication* self = MY_APPLICATION(application);
   GtkWindow* window =
       GTK_WINDOW(gtk_application_window_new(GTK_APPLICATION(application)));
@@ -32,25 +30,20 @@ static void my_application_activate(GApplication *application)
   gboolean use_header_bar = TRUE;
 #ifdef GDK_WINDOWING_X11
   GdkScreen* screen = gtk_window_get_screen(window);
-  if (GDK_IS_X11_SCREEN(screen))
+  if (GDK_IS_X11_SCREEN(screen)) {
-  {
     const gchar* wm_name = gdk_x11_screen_get_window_manager_name(screen);
-    if (g_strcmp0(wm_name, "GNOME Shell") != 0)
+    if (g_strcmp0(wm_name, "GNOME Shell") != 0) {
-    {
       use_header_bar = FALSE;
     }
   }
 #endif
-  if (use_header_bar)
+  if (use_header_bar) {
-  {
     GtkHeaderBar* header_bar = GTK_HEADER_BAR(gtk_header_bar_new());
     gtk_widget_show(GTK_WIDGET(header_bar));
     gtk_header_bar_set_title(header_bar, "{{ cookiecutter.product_name }}");
     gtk_header_bar_set_show_close_button(header_bar, TRUE);
     gtk_window_set_titlebar(window, GTK_WIDGET(header_bar));
-  }
+  } else {
-  else
-  {
     gtk_window_set_title(window, "{{ cookiecutter.product_name }}");
   }
 
@@ -70,15 +63,13 @@ static void my_application_activate(GApplication *application)
 }
 
 // Implements GApplication::local_command_line.
-static gboolean my_application_local_command_line(GApplication *application, gchar ***arguments, int *exit_status)
+static gboolean my_application_local_command_line(GApplication* application, gchar*** arguments, int* exit_status) {
-{
   MyApplication* self = MY_APPLICATION(application);
   // Strip out the first argument as it is the binary name.
   self->dart_entrypoint_arguments = g_strdupv(*arguments + 1);
 
   g_autoptr(GError) error = nullptr;
-  if (!g_application_register(application, nullptr, &error))
+  if (!g_application_register(application, nullptr, &error)) {
-  {
      g_warning("Failed to register: %s", error->message);
      *exit_status = 1;
      return TRUE;
@@ -90,25 +81,42 @@ static gboolean my_application_local_command_line(GApplication *application, gch
   return TRUE;
 }
 
+// Implements GApplication::startup.
+static void my_application_startup(GApplication* application) {
+  //MyApplication* self = MY_APPLICATION(object);
+
+  // Perform any actions required at application startup.
+
+  G_APPLICATION_CLASS(my_application_parent_class)->startup(application);
+}
+
+// Implements GApplication::shutdown.
+static void my_application_shutdown(GApplication* application) {
+  //MyApplication* self = MY_APPLICATION(object);
+
+  // Perform any actions required at application shutdown.
+
+  G_APPLICATION_CLASS(my_application_parent_class)->shutdown(application);
+}
+
 // Implements GObject::dispose.
-static void my_application_dispose(GObject *object)
+static void my_application_dispose(GObject* object) {
-{
   MyApplication* self = MY_APPLICATION(object);
   g_clear_pointer(&self->dart_entrypoint_arguments, g_strfreev);
   G_OBJECT_CLASS(my_application_parent_class)->dispose(object);
 }
 
-static void my_application_class_init(MyApplicationClass *klass)
+static void my_application_class_init(MyApplicationClass* klass) {
-{
   G_APPLICATION_CLASS(klass)->activate = my_application_activate;
   G_APPLICATION_CLASS(klass)->local_command_line = my_application_local_command_line;
+  G_APPLICATION_CLASS(klass)->startup = my_application_startup;
+  G_APPLICATION_CLASS(klass)->shutdown = my_application_shutdown;
   G_OBJECT_CLASS(klass)->dispose = my_application_dispose;
 }
 
 static void my_application_init(MyApplication* self) {}
 
-MyApplication *my_application_new()
+MyApplication* my_application_new() {
-{
   return MY_APPLICATION(g_object_new(my_application_get_type(),
                                      "application-id", APPLICATION_ID,
                                      "flags", G_APPLICATION_NON_UNIQUE,