Android: Improve dialogs about custom build template

The language didn't make it clear that it's installing a *source* template
to the project folder, for later use when compiling custom APKs.

Fixes #28736.

editor/editor_node.cpp

@@ -6411,13 +6411,13 @@ EditorNode::EditorNode() {
 	gui_base->add_child(custom_build_manage_templates);
 
 	install_android_build_template = memnew(ConfirmationDialog);
-	install_android_build_template->set_text(TTR("This will install the Android project for custom builds.\nNote that, in order to use it, it needs to be enabled per export preset."));
+	install_android_build_template->set_text(TTR("This will set up your project for custom Android builds by installing the source template to \"res://android/build\".\nYou can then apply modifications and build your own custom APK on export (adding modules, changing the AndroidManifest.xml, etc.).\nNote that in order to make custom builds instead of using pre-built APKs, the \"Use Custom Build\" option should be enabled in the Android export preset."));
 	install_android_build_template->get_ok()->set_text(TTR("Install"));
 	install_android_build_template->connect("confirmed", this, "_menu_confirm_current");
 	gui_base->add_child(install_android_build_template);
 
 	remove_android_build_template = memnew(ConfirmationDialog);
-	remove_android_build_template->set_text(TTR("Android build template is already installed and it won't be overwritten.\nRemove the \"build\" directory manually before attempting this operation again."));
+	remove_android_build_template->set_text(TTR("The Android build template is already installed in this project and it won't be overwritten.\nRemove the \"res://android/build\" directory manually before attempting this operation again."));
 	remove_android_build_template->get_ok()->set_text(TTR("Show in File Manager"));
 	remove_android_build_template->connect("confirmed", this, "_menu_option", varray(FILE_EXPLORE_ANDROID_BUILD_TEMPLATES));
 	gui_base->add_child(remove_android_build_template);

platform/android/export/export.cpp

@@ -1610,19 +1610,16 @@ public:
 				valid = false;
 			} else {
 				Error errn;
-				DirAccess *da = DirAccess::open(sdk_path.plus_file("tools"), &errn);
+				DirAccessRef da = DirAccess::open(sdk_path.plus_file("tools"), &errn);
 				if (errn != OK) {
 					err += TTR("Invalid Android SDK path for custom build in Editor Settings.") + "\n";
 					valid = false;
 				}
-				if (da) {
-					memdelete(da);
-				}
 			}
 
 			if (!FileAccess::exists("res://android/build/build.gradle")) {
 
-				err += TTR("Android project is not installed for compiling. Install from Editor menu.") + "\n";
+				err += TTR("Android build template not installed in the project. Install it from the Project menu.") + "\n";
 				valid = false;
 			}
 		}
@@ -2513,7 +2510,7 @@ void register_android_exporter() {
 	EDITOR_DEF("export/android/debug_keystore_pass", "android");
 	EDITOR_DEF("export/android/force_system_user", false);
 	EDITOR_DEF("export/android/custom_build_sdk_path", "");
-	EditorSettings::get_singleton()->add_property_hint(PropertyInfo(Variant::STRING, "export/android/custom_build_sdk_path", PROPERTY_HINT_GLOBAL_DIR, "*.keystore"));
+	EditorSettings::get_singleton()->add_property_hint(PropertyInfo(Variant::STRING, "export/android/custom_build_sdk_path", PROPERTY_HINT_GLOBAL_DIR));
 
 	EDITOR_DEF("export/android/timestamping_authority_url", "");
 	EDITOR_DEF("export/android/shutdown_adb_on_exit", true);