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Forum Update on Monday, May 27th 2025

Develop for android java issues

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  • P Phips04
    14 Oct 2020, 17:51

    Ok, I did it, but the cmd line reported some errors, and there was no effect in qt creator.
    QTAndroid2.jpg

    K Offline
    K Offline
    KroMignon
    wrote on 14 Oct 2020, 20:44 last edited by
    #16

    @Phips04 This seems to be a well know issue with Android:

    • https://stackoverflow.com/questions/60730615/sdkmanager-warning-could-not-create-setting-java-lang-illegalargumentexcepti
    • https://medium.com/@s89707192/if-you-have-the-issue-652c7c1ad5d0

    You can try:

    cd <ANDROID_SDK_ROOT>\tools\bin\
    sdkmanager --sdk_root="<ANDROID_SDK_ROOT>" --update
    sdkmanager --sdk_root="<ANDROID_SDK_ROOT>" --install "platform-tools" "platforms;android-29" "build-tools;29.0.2" "ndk-bundle"
    

    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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    • P Offline
      P Offline
      Phips04
      wrote on 15 Oct 2020, 06:35 last edited by
      #17

      It worked this way, the bundle is installed now, but I still can't change the minimal android version

      J K 2 Replies Last reply 15 Oct 2020, 06:50
      0
      • P Phips04
        15 Oct 2020, 06:35

        It worked this way, the bundle is installed now, but I still can't change the minimal android version

        J Offline
        J Offline
        J.Hilk
        Moderators
        wrote on 15 Oct 2020, 06:50 last edited by
        #18

        @Phips04 do it by hand than, open the android manifest.xml in a text editor
        and change the version there
        2fb9ec48-f65e-4d1d-97a4-2689c7454849-image.png


        Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


        Q: What's that?
        A: It's blue light.
        Q: What does it do?
        A: It turns blue.

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        • P Offline
          P Offline
          Phips04
          wrote on 15 Oct 2020, 07:36 last edited by
          #19

          The .xml can be evaluated and I set the entries. Min sdk is 21 (android 5) and target is 27 (android 8.1). The error still is the same

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          • P Phips04
            15 Oct 2020, 06:35

            It worked this way, the bundle is installed now, but I still can't change the minimal android version

            K Offline
            K Offline
            KroMignon
            wrote on 15 Oct 2020, 07:41 last edited by
            #20

            @Phips04 said in Develop for android java issues:

            It worked this way, the bundle is installed now, but I still can't change the minimal android version

            What do you mean with "you can't"? Is the dropdown combobox grayed out or is the list empty?
            Do you have restart Qt Creator after updating SDK root?

            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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            • P Offline
              P Offline
              Phips04
              wrote on 15 Oct 2020, 07:48 last edited by
              #21

              Yes the combobox was grayed (I set the entries in the xml file via text editor, now I can edit the boxes) and I restarted Qt creator.

              K 1 Reply Last reply 15 Oct 2020, 08:10
              0
              • P Phips04
                15 Oct 2020, 07:48

                Yes the combobox was grayed (I set the entries in the xml file via text editor, now I can edit the boxes) and I restarted Qt creator.

                K Offline
                K Offline
                KroMignon
                wrote on 15 Oct 2020, 08:10 last edited by KroMignon
                #22

                @Phips04 I know how have written "Java settings are ok", but which JDK version are you using?

                AFAIK, gradle do NOT work with JDK > 11, and recommended version is still JDK 8.

                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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                • P Offline
                  P Offline
                  Phips04
                  wrote on 15 Oct 2020, 08:49 last edited by
                  #23

                  I meant qt Creator says Java settings are ok.
                  I didn't remember that version 8 is the recommended one, installed 15.
                  I will replace it by 8 now

                  K 1 Reply Last reply 15 Oct 2020, 09:05
                  0
                  • P Phips04
                    15 Oct 2020, 08:49

                    I meant qt Creator says Java settings are ok.
                    I didn't remember that version 8 is the recommended one, installed 15.
                    I will replace it by 8 now

                    K Offline
                    K Offline
                    KroMignon
                    wrote on 15 Oct 2020, 09:05 last edited by KroMignon
                    #24

                    @Phips04 said in Develop for android java issues:

                    I didn't remember that version 8 is the recommended one, installed 15.

                    Yes, it is no clearly defined ==> https://doc.qt.io/qt-5/android-building.html.
                    JDK 8, still recommended for best compatibility, but starting with Qt 5.15 JDK 11 could be used.

                    Side note: if you search on internet java.lang.NoClassDefFoundError: Could not initialize class org.codehaus.groovy.vmplugin.v7.Java7, all matches you will found will clearly detail the issue. The gradle version is not compatible with the selected JDK.
                    For Qt 5.15, the used gradle version is 5.6.4 (just check in <QT_DIR>/5.15.0/android/src/3rdparty/gradle/gradle/wrapper/gradle-wrapper.properties)

                    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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                    2
                    • P Offline
                      P Offline
                      Phips04
                      wrote on 15 Oct 2020, 15:20 last edited by
                      #25

                      Ok, now finally it works. This is my very basic UI for testing

                      QTAndroid4.jpg

                      This is the sourcecode:

                      import QtQuick 2.15
                      import QtQuick.Window 2.15

                      Window {
                      Rectangle {
                      id: rectangle
                      color: "#09a4cc"
                      anchors.fill: parent

                          Rectangle {
                              id: rectangle1
                              x: 220
                              y: 117
                              width: 200
                              height: 200
                              color: "#4facfe"
                              radius: height / 2
                              gradient: Gradient {
                                  GradientStop {
                                      position: 0
                                      color: "#4facfe"
                                  }
                      
                                  GradientStop {
                                      position: 1
                                      color: "#00f2fe"
                                  }
                              }
                          }
                      }
                      

                      }

                      What it shows is simply a white screen.๐Ÿ™„

                      K 1 Reply Last reply 15 Oct 2020, 15:46
                      1
                      • P Phips04
                        15 Oct 2020, 15:20

                        Ok, now finally it works. This is my very basic UI for testing

                        QTAndroid4.jpg

                        This is the sourcecode:

                        import QtQuick 2.15
                        import QtQuick.Window 2.15

                        Window {
                        Rectangle {
                        id: rectangle
                        color: "#09a4cc"
                        anchors.fill: parent

                            Rectangle {
                                id: rectangle1
                                x: 220
                                y: 117
                                width: 200
                                height: 200
                                color: "#4facfe"
                                radius: height / 2
                                gradient: Gradient {
                                    GradientStop {
                                        position: 0
                                        color: "#4facfe"
                                    }
                        
                                    GradientStop {
                                        position: 1
                                        color: "#00f2fe"
                                    }
                                }
                            }
                        }
                        

                        }

                        What it shows is simply a white screen.๐Ÿ™„

                        K Offline
                        K Offline
                        KroMignon
                        wrote on 15 Oct 2020, 15:46 last edited by
                        #26

                        @Phips04 I think you have to set property visible to true of top Window:

                        import QtQuick 2.15
                        import QtQuick.Window 2.15
                        
                        Window {
                            visible: true // ==> default value is false!
                            Rectangle {
                                id: rectangle
                                color: "#09a4cc"
                                anchors.fill: parent
                              ...
                           }
                        }
                        

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

                        1 Reply Last reply
                        1
                        • P Offline
                          P Offline
                          Phips04
                          wrote on 15 Oct 2020, 18:52 last edited by Phips04
                          #27

                          Ok, QT creator does not recongnize the property, but it compiles, and now it works the way it should,
                          thanks for your help๐Ÿ‘

                          K 1 Reply Last reply 16 Oct 2020, 05:27
                          1
                          • P Phips04
                            15 Oct 2020, 18:52

                            Ok, QT creator does not recongnize the property, but it compiles, and now it works the way it should,
                            thanks for your help๐Ÿ‘

                            K Offline
                            K Offline
                            KroMignon
                            wrote on 16 Oct 2020, 05:27 last edited by
                            #28

                            @Phips04 Your welcome

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

                            1 Reply Last reply
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                            15 Oct 2020, 15:20

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