Solved by: adb kill-server sudo cp ~/Android/Sdk/platform-tools/adb /usr/bin/adb sudo chmod +x /usr/bin/adb adb start-server thanks to this

it seems that i can achieve this through what android developpers call system_overlay i still don't know if i can do it with c++ i found that something like this may exist for QML https://doc.qt.io/qt-5/qml-qtquick-controls2-overlay.html?fbclid=IwAR3aAt6Lj6nVc5drVgLxk9tJ8-jXQS--ZOy2aPsnjoxvqA3L84SfImhVmtM#details

@jsulm That is correct, but I'd first try with the latest Qt 5 version 5.15.2 Regards

Hi, For highly specific platform API, you will have to write some platform specific code. Qt can't cover absolutely everything and it's not its goal. Android is a bit of a special case because of its use of Java. You should take a look at the QtAndroidExtras module and its examples. Note that this is really specific to Android and how it works. There are other extras modules for some often used platform specific stuff that you can take a look at in terms of how things can be done. Note that these modules have been deprecated for Qt 6 in favor of a different approach and integration in a more centralized way.

@Kyeiv , I think yes, because a lot time ago, a mr. Mike Goza tried to add the QtSerialPort support to android (for FTDI, CP, PL and other chips): https://codereview.qt-project.org/c/qt/qtserialport/+/83480 (but unsuccessfull). There are used the USB API, directly. But, you can take the FTDI example provided by @Pablo-J-Rogina , if it will be simpler.

Sorry, I meant for video encoding. In any case, I would separate the streaming and the preview if possible. Generating the network stream for one or more device can be very heavy CPU wise.

@sierdzio Hmm, looks like I did forget that.

@EmileDW See https://doc-snapshots.qt.io/qt6-dev/android.html "Android 6.0 or later (API level 23 or higher)"

@Pablo-J-Rogina i looked through its documentation and i am afraid that it returns only internal storage paths.

@ConnorLee I have the same issue with my installation. I did not notice the problem earlier, but then I updated Android SDK to the latest version and after that I can't deploy my app any more to any device. QtCreator says "Android settings are OK. (SDK Version: 3.0, NDK Version: 21.3.6528147)" From the AnroidManifest.xml I can't set minimum nor target SDK.

@Kyeiv said in Could not resolve all artifacts for configuration ':classpath': OpenJDK 9.0.4 You need to use Java 8, see here. Versions higher than 8 might cause issues for the Android SDK command-line tools.

I don't understand this well: From looking at the documentation, it seems that the QAndroidJniObject constructor and methods have to be attaching and detaching the current thread to and from the JVM, which isn't going to work in a JNI thread that's already attached to the JVM. Does this mean that, if I call C++ function(that uses QAndroidJniObject) from java JNI class, it is not going to work? Because as I understand, QAndroidJniObject is attaching and detaching the current thread to and from the JVM, and the JNI java object that is calling native functions, is already attached to the JVM. Please correct me if I am wrong.

@Phips04 Your welcome

@JonB yes I tried but its giving message that the file is not found.

Found what was causing the problem from here. I don't know why but running without -j4 like this: mingw32-make there is no error and qt is built successfully. I thought that without -j4 I would see the error message but luckily there was no error.

The problem is likely the NDK version, which is optimal for Qt 5.12.3, but likely not compatible with 5.15

@Jose-LZ said in The mess of the Android tools: The documentation in https://doc.qt.io/qt-5/android-getting-started.html is only a list of thinks but does not explain what each element is. You are more than welcome to contribute additions/clarifications to such document so others users could benefit from your experience :-)

yes I did. the get request is working in it.

@sierdzio Thanks, this is exactly what I needed! Ended up doing: #if defined(Q_OS_ANDROID) const QUrl url(QStringLiteral("qrc:/main_android.qml")); #elif defined (Q_OS_LINUX) const QUrl url(QStringLiteral("qrc:/main_linux.qml")); #endif in my main.cpp

I solved this above problem in Qt by using Qandroidjniobject. For launching camera by using intent code is given below, QAndroidJniObject ACTION_IMAGE_CAPTURE = QAndroidJniObject::getStaticObjectField("android/provider/MediaStore", "ACTION_IMAGE_CAPTURE", "Ljava/lang/String;"); QAndroidJniObject intent("android/content/Intent", "(Ljava/lang/String;)V", ACTION_IMAGE_CAPTURE.object<jstring>()); QtAndroid::startActivity(intent.object<jobject>(), 101, this);

@ashajg how to registerReceiver in c++?

Trick with android/libs should work for older Qt versions, too, and it works the same on qmake and cmake. If all else fails, you could have different .pri per Qt version... It's a nuisance for sure but my hope is that for Qt 5.14+ it will stay as it is for long.

@J-Hilk @sierdzio thank you guys!

I can solve the problem. First, I created folder sqldrivers including libqsqlite.so in the app directory (e.x. /data/user/0/com.example.polarislib) and I set permission by chmod 777 to sqldrivers folder and libqsqlite.so file and finally I used the following code in my source where the connection to Sqlite is needed: QCoreApplication::addLibraryPath("/data/user/0/com.example.polarislib");

I can open this port by: So, as I said, the problem is not in O_LARGEFILE. There are just a few codes in QSP sources in github link This is not a sources, the sources is in.

@KroMignon said in Issue with mkpath on Android: @koahnig I guess the files are written under /data/user/0/<packagename>/files/ You are correct that this is the path shown with writableLocation. It is also generated under /storage/emulated/0/Android/data/<packagename>/files. However, you cannot simply this /data/user/0/<packagename>/files/ for absolute path' with ofstream under C++. These files are not generated. I was previously wrong. The issue is the same for Android 9 and Android 10. When using /storage/emulated/0/Android/data/<packagename>/files this might be used as basis for absolute path' generation and std::ofstream of C++.

@SyntaX said in Timer stops/pauses if Activity is suspended in Android: Do I just send an Email to android-development@qt-project.org and everyone who is subscribed gets the message? Seems a bit of a overkill like @everyone to me? No problem, you first have to register to the mailing list, and then you can send emails to it. This is the Qt-Android developers mailing list. So your mail will be received by each member. That's the way mailing lists works ;-) You can also try to contact BogDan Vatra from KDAB, which is the main developer of Qt/Android

Post your environment information (OS, Qt version, Qt Creator version) Are Android SDK & NDK installed and set up in Qt Creator? Have you selected the architecture in Projects->Build pane of Qt Creator? Is this a new project or some older one which you are porting to newer Qt version?

@Dmitriano I guess QAndroidJniEnvironment::ExceptionCheck() purpose is to catch exception which occurred during function execution and not "function not exist" exception. So your use case is not covered. Don't you have hand over Java code? Just create an empty function which throw an exception, this should be catchable with QAndroidJniEnvironment::ExceptionCheck().