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    Unsolved Android deployment with Ministro

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    android qt 5.7 deploying ministro
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    • KroMignon
      KroMignon @raven-worx last edited by

      @raven-worx

      I do...
      It works fine when I use Bundle Qt libraries in APK as Qt Deployment strategy.
      I haven't change any line of code between the two APK generation.

      With Use Ministro service to install Qt, the application crash

      It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth. (Sherlock Holmes)

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      • KroMignon
        KroMignon @raven-worx last edited by

        @raven-worx said in Android deployment with Ministro:

        you didn't register your native JNI methods?!?

        I do register them with following code:

        //create a vector with all our JNINativeMethod(s)
        static JNINativeMethod methods[] = {
            { "focusWindow", "()V", (void *)focusWindow },
        };
        
        // this method is called automatically by Java after the .so file is loaded
        JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* /*reserved*/)
        {
            JNIEnv* env;
            // get the JNIEnv pointer.
            if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK)
              return JNI_ERR;
        
            // search for Java class which declares the native methods
            jclass javaClass = env->FindClass("com/geocept/android/NativeFunctions");
            if (!javaClass)
              return JNI_ERR;
        
            // register our native methods
            if (env->RegisterNatives(javaClass, methods,
                                  sizeof(methods) / sizeof(methods[0])) < 0) {
              return JNI_ERR;
            }
        
            return JNI_VERSION_1_6;
        }
        

        Is there a way to made "incremental updates" with APK?
        I install first a full featured APK then only APK without the Qt libs?

        It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth. (Sherlock Holmes)

        raven-worx 1 Reply Last reply Reply Quote 0
        • raven-worx
          raven-worx Moderators @KroMignon last edited by raven-worx

          @KroMignon
          i suspect that there is still something wrong in your code/project-setup...

          Did you try to debug and step through in the call to JNI_OnLoad()?
          Also where is this method defined? What kind of library is this?
          Note that JNI_OnLoad() isn't loaded in Qt plugins (QQmlExtensionPlugin, ...)

          --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
          If you have a question please use the forum so others can benefit from the solution in the future

          KroMignon 1 Reply Last reply Reply Quote 0
          • KroMignon
            KroMignon @raven-worx last edited by KroMignon

            @raven-worx

            Did you try to debug and step through in the call to JNI_OnLoad()?
            Also where is this method defined? What kind of library is this?
            Note that JNI_OnLoad() isn't loaded in Qt plugins (QQmlExtensionPlugin, ...)

            I have picked JNI_OnLoad() usage from a presentation made by BogDan Vatra on QtCon 2016 ==> which was based on Qt 5.7
            This presentation was called Practical Qt on Android JNI

            It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth. (Sherlock Holmes)

            raven-worx 1 Reply Last reply Reply Quote 0
            • raven-worx
              raven-worx Moderators @KroMignon last edited by

              @KroMignon
              JNI_OnLoad() is only called when the library is loaded using System.loadLibrary() (Java method). Which isn't used when loading Qt plugins.
              Thats why i asked what kind of library yours is.

              --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
              If you have a question please use the forum so others can benefit from the solution in the future

              KroMignon 1 Reply Last reply Reply Quote 0
              • KroMignon
                KroMignon @raven-worx last edited by KroMignon

                @raven-worx

                I use this to call C++ functions from Java, for example to be informed about Battery and WIFI level (which are got with an Android/Java BroadcastReceiver).

                I don't understand why this works when Qt libs in APK and don't work when using Ministro...

                It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth. (Sherlock Holmes)

                raven-worx 1 Reply Last reply Reply Quote 0
                • raven-worx
                  raven-worx Moderators @KroMignon last edited by

                  @KroMignon
                  again: what is this library? Is this a simple default library linked to your application or is it a plugin?
                  How did you (exactly) add this library to your APK?

                  I guess at the time you are trying to call the native method the method isn't registered yet. And set a breakpoint in your JNI_OnLoad(), as i already suggested. If the crash occurs before the breakpoint is hit, then this is your problem.

                  If thats the case you can try to create the Java notification callback once you are sure that the methods have been registered successfully. You could set a Java variable at the end of JNI_onLoad() for example.

                  --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
                  If you have a question please use the forum so others can benefit from the solution in the future

                  KroMignon 1 Reply Last reply Reply Quote 0
                  • KroMignon
                    KroMignon @raven-worx last edited by

                    @raven-worx

                    This is in my application, there no external library, other than Qt.
                    This JNI_OnLoad() function is in a C++ class in my App project. The file name is JniInterfaces.cpp.
                    The function signature is:

                    ...
                    static void focusWindow(JNIEnv * /*env*/,
                                            jobject /*obj*/)
                    {
                        if(HandheldInit::exists() && qGuiApp->focusWindow() != Q_NULLPTR)
                        {
                            QTimer::singleShot(0, qGuiApp->focusWindow(), SLOT(raise()));
                        }
                    }
                    
                    //create a vector with all our JNINativeMethod(s)
                    static JNINativeMethod methods[] = {
                        { "focusWindow", "()V", (void *)focusWindow },
                    };
                    // this method is called automatically by Java after the .so file is loaded
                    JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* /*reserved*/)
                    { ... } // See BogDan Vatra presentation at Qt Con 2016
                    ...
                    

                    It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth. (Sherlock Holmes)

                    raven-worx 1 Reply Last reply Reply Quote 0
                    • raven-worx
                      raven-worx Moderators @KroMignon last edited by raven-worx

                      @KroMignon
                      ok i give up....
                      I am on hold until you answer the questions i asked. I wont ask a third time....

                      --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
                      If you have a question please use the forum so others can benefit from the solution in the future

                      KroMignon 1 Reply Last reply Reply Quote 0
                      • KroMignon
                        KroMignon @raven-worx last edited by

                        @raven-worx: sorry but there is no other library than Qt libraries...
                        I don't understand your question!
                        JNI_OnLoad() is in my application Project, focusWindow() also.
                        The Java code also.
                        There is no library!!!

                        It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth. (Sherlock Holmes)

                        raven-worx 1 Reply Last reply Reply Quote 0
                        • raven-worx
                          raven-worx Moderators @KroMignon last edited by

                          @KroMignon said in Android deployment with Ministro:

                          There is no library!!!

                          @KroMignon said in Android deployment with Ministro:

                          // this method is called automatically by Java after the .so file is loaded
                          JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* /reserved/)
                          { ... } // See BogDan Vatra presentation at Qt Con 2016

                          You said it's working when you don't use Ministro but bundle the Qt libs with the APK.
                          But even then the JNI_OnLoad() wouldn't be called, since you implemented JNI_OnLoad() not in a library.

                          --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
                          If you have a question please use the forum so others can benefit from the solution in the future

                          KroMignon 1 Reply Last reply Reply Quote 0
                          • KroMignon
                            KroMignon @raven-worx last edited by

                            @raven-worx: the Qt Project create a library, called libNavDispatchHandheld.so, this is in the APK in /lib/armeabi-v7a.
                            Is this your are talking about?
                            And in this lib, which contains my C++ classes, is the JNI_OnLoad() function.

                            It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth. (Sherlock Holmes)

                            KroMignon 1 Reply Last reply Reply Quote 0
                            • KroMignon
                              KroMignon @KroMignon last edited by

                              @raven-worx: just to pass this annoying question about JNI. I have made a simple test, on which I removed all JNI functions (from Java => C++)
                              This also didn't work.
                              I've got an system error which indicates Ministro not available. But I have installed it (App-Info say it is v10.5).

                              Is Qt5.7.1 not supported by Ministro?

                              I there a way to generate APK with all needed Qt stuff and then just do "upgrades" with my libs/qml/whatever ?

                              I'm a big Qt enthusiast, but it is very discouraging and sad to have the feeling to have to battle agains the System and not to work with it :(

                              It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth. (Sherlock Holmes)

                              raven-worx 1 Reply Last reply Reply Quote 0
                              • raven-worx
                                raven-worx Moderators @KroMignon last edited by

                                @KroMignon said in Android deployment with Ministro:

                                just to pass this annoying question about JNI. I have made a simple test, on which I removed all JNI functions (from Java => C++)
                                This also didn't work.

                                same error/exception?!?!

                                --- SUPPORT REQUESTS VIA CHAT WILL BE IGNORED ---
                                If you have a question please use the forum so others can benefit from the solution in the future

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                                • KroMignon
                                  KroMignon @raven-worx last edited by

                                  @raven-worx : no, there is an Android Popup which says I have to install Ministro... Which is already installed! ==> v10.5

                                  It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth. (Sherlock Holmes)

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                                  • KroMignon
                                    KroMignon @raven-worx last edited by

                                    @raven-worx : I've got an answer from BogDan Vatra, in fact Ministro does not support Qt 5.7.x
                                    This is why nothing works when generating APK with Ministro.

                                    Qt5.7.x support will be added some time later. This is a bad news for me... I can't wait for a Ministro update.

                                    So I found a workaround, I give it here, perhaps this could help someone else.

                                    I have create a APK with Qt lib included, in release mode but not signed.
                                    From this APK, which is in fact a ZIP archive, I've extract all Qt specific stuff:

                                    • assets/--Added-by-androiddeployqt--/*
                                    • lib/armeabi-v7a/libplugins_*
                                    • lib/armeabi-v7a/libqml_*
                                    • lib/armeabi-v7a/libQt5*
                                    • lib/armeabi-v7a/libgnustl_shared

                                    I copy those files on device, into internal storage.
                                    Then, I generate new APK (same configuration: release, with Qt libs and not signed).
                                    To generate the update APK, I remove from this the Qt specific stuff (so APK size is now less than 2MB).
                                    I transfer this APK on device, on device side I insert missed Qt libs into.
                                    Then I start APK installation on device.

                                    This a very dirty way to do it, but it WorksForMe(TM)

                                    It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth. (Sherlock Holmes)

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