fix: swap buffers error (#2347)

CMakeLists.txt

@@ -12,7 +12,7 @@ string(TIMESTAMP CURRENT_DATE "%Y-%m-%d")
 set(RELEASE_DATE "${CURRENT_DATE}")
 
 set(APP_MAJOR_VERSION ${CMAKE_PROJECT_VERSION_MAJOR}.${CMAKE_PROJECT_VERSION_MINOR}.${CMAKE_PROJECT_VERSION_PATCH})
-set(APP_ANDROID_VERSION_CODE 2117)
+set(APP_ANDROID_VERSION_CODE 2118)
 
 if(${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
     set(MZ_PLATFORM_NAME "linux")

client/amnezia_application.cpp

@@ -109,6 +109,16 @@ void AmneziaApplication::init()
             // install filter on main window
             if (auto win = qobject_cast<QQuickWindow*>(obj)) {
                 win->installEventFilter(this);
+#ifdef Q_OS_ANDROID
+                QObject::connect(win, &QQuickWindow::sceneGraphError,
+                    [](QQuickWindow::SceneGraphError, const QString &msg) {
+                        qWarning() << "Scene graph error (suppressed):" << msg;
+                    });
+                // Keep graphics context alive across hide/show cycles to avoid
+                // eglSwapBuffers/makeCurrent being called on a context Android has reclaimed.
+                win->setPersistentSceneGraph(true);
+                win->setPersistentGraphics(true);
+#endif
                 win->show();
             }
         },

client/ui/qml/main2.qml

@@ -21,10 +21,14 @@ Window  {
         function onStateChanged() {
             if (Qt.platform.os === "android") {
                 if (Qt.application.state === Qt.ApplicationActive) {
+                    root.visible = true
                     refreshTimer.restart()
-                } else if (Qt.application.state === Qt.ApplicationSuspended || 
-                          Qt.application.state === Qt.ApplicationInactive) {
-                    console.log("QML: Application going to background, state:", Qt.application.state)
+                } else if (Qt.application.state === Qt.ApplicationSuspended) {
+                    // Hide window to stop the Qt render loop and prevent
+                    // eglSwapBuffers from being called on a lost EGL context.
+                    // NOTE: Do NOT hide on ApplicationInactive — that fires on any
+                    // focus change (IME, notifications) and would blank the screen.
+                    root.visible = false
                 }
             }
         }