diff --git a/src/dbus/applicationservice.cpp b/src/dbus/applicationservice.cpp
index 80ac0c6..bda8305 100644
--- a/src/dbus/applicationservice.cpp
+++ b/src/dbus/applicationservice.cpp
@@ -333,13 +333,13 @@ QString ApplicationService::id() const noexcept
 bool ApplicationService::x_Flatpak() const noexcept
 {
     auto val = findEntryValue(DesktopFileEntryKey, "X-flatpak", EntryValueType::String);
-    return val.isNull();
+    return !val.isNull();
 }
 
 bool ApplicationService::x_linglong() const noexcept
 {
     auto val = findEntryValue(DesktopFileEntryKey, "X-linglong", EntryValueType::String);
-    return val.isNull();
+    return !val.isNull();
 }
 
 qulonglong ApplicationService::installedTime() const noexcept
diff --git a/src/global.h b/src/global.h
index 4ef49af..9a7efa8 100644
--- a/src/global.h
+++ b/src/global.h
@@ -471,6 +471,7 @@ inline std::tuple<std::size_t, std::size_t, std::size_t> getFileTimeInfo(const Q
 {
     struct stat buf;
 
+    // TODO: use QFileInfo get timeInfo, and return a custom time structure.
     if (auto ret = stat(file.absoluteFilePath().toLocal8Bit().constData(), &buf); ret == -1) {
         qWarning() << "get file" << file.absoluteFilePath() << "state failed:" << std::strerror(errno);
         return std::make_tuple(0, 0, 0);