Demos: request Android storage permissions when using QStandardPaths

http example uses QStandardPaths, on Android permissions might need
to be explicitly requested to write the downloaded file.

Task-number: QTBUG-80717
Change-Id: Id01c0486656a33caac74e2a31a7b7d9c83df28a1
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

1 files changed, 20 insertions, 0 deletions

diff --git a/examples/demos/photosurface/main.cpp b/examples/demos/photosurface/main.cpp
index d1522bd09..f4aadfd50 100644
--- a/examples/demos/photosurface/main.cpp
+++ b/examples/demos/photosurface/main.cpp
@@ -64,6 +64,22 @@
 #include <QtCore/QMimeDatabase>
 #include <QtCore/QStandardPaths>
 #include <QtCore/QUrl>
+#ifdef REQUEST_PERMISSIONS_ON_ANDROID
+#include <QtAndroid>
+
+bool requestStoragePermission() {
+    using namespace QtAndroid;
+
+    QString permission = QStringLiteral("android.permission.WRITE_EXTERNAL_STORAGE");
+    const QHash<QString, PermissionResult> results = requestPermissionsSync(QStringList({permission}));
+    if (!results.contains(permission) || results[permission] == PermissionResult::Denied) {
+        qWarning() << "Couldn't get permission: " << permission;
+        return false;
+    }
+
+    return true;
+}
+#endif
 
 static QStringList imageNameFilters()
 {
@@ -88,6 +104,10 @@ int main(int argc, char* argv[])
 #else
     QGuiApplication app(argc, argv);
 #endif
+#ifdef REQUEST_PERMISSIONS_ON_ANDROID
+    if (!requestStoragePermission())
+        return -1;
+#endif
     QQuickWindow::setDefaultAlphaBuffer(true);
 
     QCoreApplication::setApplicationName(QStringLiteral("Photosurface"));