Mobile and Embedded

@jsulm Thx. I've been checking it. Issue closed.

@Iheb Could you share your new working code please?

@lucaszanella could you show your project file (.pro)? In addition, do you have any Java code in your project? If so, could you also show that?` Just in case, and to check that your Qt Creator/Android environment is setup OK, are you able to run any Android example? like Qt Notifier or Qt JNI Messenger?

SOLVED: By setting the QT_DEBUG_PLUGINS variable and launching the program it shows the list of available plugins, styles included. The program uses, by default, the style bb10dark. Using the parameter -style bb10bright (or cleanlooks, cde, plastique) the application has the correct colors. Example : ./my_test_program -platform linuxfb -style cde

I don't know the answer but I'd definitely recommend using newer Qt for this. Cmake support for Android is a new thing, it may work better in newer release (like 5.15).

@Ivan_Gorchev ,What it worked for me is to copy the image with netcat, and mounted it on my host, so I was able to have a copy for the whole emmc data in my host. You just need to open a connection between the host and the target with two commands: Host ->sudo nc -l 19000|dd bs=1M of=name.img i.e sudo nc -l 19000|dd bs=1M of=bbb-with-ssl-and-icu-dev.img Target ->sudo dd bs=1M if=/dev/blocktocopy|nc host_ip_address 19000 i.e sudo dd bs=1M if=/dev/mmcblk1p1|nc 192.168.7.1 19000 just make sure you applied an apt-get clean or reboot your target before execute the command (I got several errors when I tried to mounted) Once the data is being transfered, you just need to mount the image into your host: sudo mount -o loop name.img ~/path i.e sudo mount -o loop bbb-with-ssl-and-icu-dev.img ~/opt/mnt/rootfs/ and you can use as sysroot, You can read how other people did it on raspberry or beaglebone : https://wiki.qt.io/BeagleBone_Black_Beginners_Guide Raspberry is the most used board at this moment, so you will find a lot of info about how to use sync

@JagSingh said in QT or Andriod for embedded app: I would really appreciate any guidance please. I depends, do you have C++ knowledge? If you don't know anything about C++, using Qt can be difficult. If you are confident with Android/Java, go with Android, there are many Android images available for RPi. A quick search on internet gives me this link => https://www.makeuseof.com/tag/install-android-raspberry-pi/ By the way, you could also create an Android App with Qt ;)

@ununez I don't have experience with a BBB device myself, but given it has an OS (i.e. Debian Linux) and you're have to install Qt dependencies on it, I guess you'll be able to follow this guide (intended for RPi devices). In addition, some time ago somebody provided a PDF to this forum with detailed steps about cross-compiling Qt for Beablebone. You may want to search it just in case.

@KroMignon said in How to get an int value using QtAndroid::androidActivity().callObjectMethod?: @Nelson_Piquet said in How to get an int value using QtAndroid::androidActivity().callObjectMethod?: How can I collect an int or a jint using QtAndroid::androidActivity().callObjectMethod? To get int, you have to use callMethod(): int my_int = QtAndroid::androidActivity().callMethod<jint>("someMethod"); ==> take a look at documentation: QAndroidJniObject Class This fixes my problem!

Solved by adding the complete path to the SDK and NDK.

@prinzkm I don't have any experience with Qt on embedded devices. However, on the same page you provided the screenshot it has a section on "Available Keyboard Drivers". These are Qt-specific drivers, as far as I understand. It seems that currently only two drivers are available: TTY and LinuxInput. By default Qt is only compiled with support for TTY. Unfortunately, this is also the driver which intercepts Ctrl+Alt+F1 and Ctrl+Alt+Backspace. Therefore, you should have a look at the other driver. My understanding is that for this to work you need to compile Qt yourself with the LinuxInput driver enabled (by providing the command line option -qt-kbd-linuxinput when configuring Qt before compilation. I hope, somebody else can help you with these keyboard drivers.