icon not shown by running created AppImage

[SiminBadri]

I've used linuxdeployqt to deploy my Qt app. It successfully creates the AppImage, however, after running the AppImage the icon of my app is not shown in the Linux menu bar.

I googled this problem and tried all the suggested solutions, however, they don't work for me.

1. First of all, I set the icon for my app in main.cpp:

QApplication app(argc, argv); app.setWindowIcon(QIcon(":/content/icons/Play.png"));

2. I created a folder "Play.AppDir" that has the structure like what's suggested in linuxdeployqt:

3. This is my Play.desktop file:

[Desktop Entry] Type=Application Name=Play Exec=Play %F Icon=Play Comment=Edit this default file Terminal=true Categories=Utility; X-AppImage-Version=1.3.2 StartupWMClass=Play Name[en_US]=Play

4. I run the following command: $ARCH=x86_64 '/home/siminbadri/Downloads/linuxdeployqt-continuous-x86_64.AppImage' '/home/siminbadri/Documents/bin/linux/x64/Release/PlayPod.AppDir/usr/share/applications/Play.desktop' -appimage

5. The AppImage is created successfully "Play-46b3d31-x86_64.AppImage", however, when I click on it the app Icon is not shown on the menu bar. Instead, a question mark is shown.

Thanks

[probonopd]

Do you get the same behavior in e.g., KDE Plasma or Xfce?

[SiminBadri]

I tested my appImage on xubuntu but it does not show my icon

[SiminBadri]

I installed kubuntu and tested the created appImage but it did not show my icon I will try testing on kde plasma too.

Do I need to use linuxdeployqt in kde plasma to get appImage? Are the steps I mentioned before are correct and enough to get the appImage capable to show the app's icon?

[probonopd]

QApplication::setWindowIcon() should do the trick. In https://github.com/JvanKatwijk/qt-dab/issues/69#issuecomment-345607883 it was pointed out that

Adding setting the resources compiler in the CMakeLists.txt file did the trick

[SiminBadri]

Thank you for replying. I've added the QApplication::setWindowIcon() in my code (I also mentioned this in my first post), however, it didn't do the trick for me. I also checked the link you referenced: the icon is shown with building the app by qmake. But building with cmake needs some changes in CmakeList.txt to work. However, I build my app using qmake (by QCreator IDE). I applied all solutions suggested in forums, but still no success.

I try deploying my app on other Linux distributions to see whether it works or not. I'll inform you of the result.

Thanks

[antis81]

Hi, have you tried providing the icon in different explicit resolutions (for test just copy the 256x256 PNG)? I checked against Ubuntu 16.04 (boy is that old…^^): Assuming the directory structure of an appdir/appimage is the same as on the "real" system icons are located in appdir/usr/share/icons/hicolor/scalable/apps/<my_app>.svg. This should work on most "modern" desktops. To properly provide icons for a wider variety of desktops the icon should be explicitly scaled in a bitmap format (PNG) with resolutions based on 16px -> (32x32, 48x48, 96x96, …, 256). The directory prefix may differ. Please check AppImage definitions and/or XDG.

[probonopd]

It could also be possible that you need to tell linuxdeployqt to deploy the iconengines and imageformats plugins if they don't already get deployed. Try -extra-plugins=iconengines,imageformats.

Reference: https://github.com/probonopd/linuxdeployqt/issues/347

[MoritzMoreira]

I have the problem that the icon appears when running the appimage on the system where I deployed it, but not on another system (Ubuntu 22.04). Copying the image to .../256x256/apps on the destination system did not help. When I run linuxqtdeploy the image file was also in the directory where the built app is. In my main.cpp file i have a.QApplication::setWindowIcon(QIcon(":/new/prefix1/Geocalc.png")); Commands: export PATH=/home/mau/Qt/6.6.1/gcc_64/bin/:$PATH ./linuxdeployqt-continuous-x86_64.AppImage geocalc/Georechner -appimage -extra-plugins=iconengines,platformthemes/libqgtk3.so -verbose=2 deploying on Ubuntu 20.04.6 LTS

[probonopd]

Are you using Wayland by any chance? There the icons are utterly broken (like many things).

[MoritzMoreira]

both deploying and new Ubuntu are using x11, actually, at least judging from echo $XDG_SESSION_TYPE But it's working on antix (Debian 12). It's not soo important , actually...