Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. General and Desktop
  4. Develop for android java issues
Forum Update on Monday, May 27th 2025

Develop for android java issues

Scheduled Pinned Locked Moved Solved General and Desktop
quickandroidmobile
28 Posts 5 Posters 7.5k Views
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • P Offline
    P Offline
    Phips04
    wrote on last edited by
    #13

    Java and android settings are ok, in the android settings there is no "ndk-bundle". But the second entry exists, as I mentioned OpenSSL is not set

    KroMignonK 1 Reply Last reply
    0
    • P Phips04

      Java and android settings are ok, in the android settings there is no "ndk-bundle". But the second entry exists, as I mentioned OpenSSL is not set

      KroMignonK Offline
      KroMignonK Offline
      KroMignon
      wrote on last edited by
      #14

      @Phips04 said in Develop for android java issues:

      in the android settings there is no "ndk-bundle"

      This is your problem, ndk-bundle is mandatory for Qt!

      Extract from the Qt documentation:
      Use the sdkmanager command line tool to update the packages list and then install the essential packages:

      cd <ANDROID_SDK_ROOT>/tools/bin/
      ./sdkmanager --update
      ./sdkmanager --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)

      1 Reply Last reply
      0
      • P Offline
        P Offline
        Phips04
        wrote on last edited by
        #15

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

        KroMignonK 1 Reply Last reply
        0
        • P Phips04

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

          KroMignonK Offline
          KroMignonK Offline
          KroMignon
          wrote on 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)

          1 Reply Last reply
          0
          • P Offline
            P Offline
            Phips04
            wrote on last edited by
            #17

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

            J.HilkJ KroMignonK 2 Replies Last reply
            0
            • P Phips04

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

              J.HilkJ Offline
              J.HilkJ Offline
              J.Hilk
              Moderators
              wrote on 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.

              1 Reply Last reply
              0
              • P Offline
                P Offline
                Phips04
                wrote on 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

                1 Reply Last reply
                0
                • P Phips04

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

                  KroMignonK Offline
                  KroMignonK Offline
                  KroMignon
                  wrote on 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)

                  1 Reply Last reply
                  0
                  • P Offline
                    P Offline
                    Phips04
                    wrote on 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.

                    KroMignonK 1 Reply Last reply
                    0
                    • P Phips04

                      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.

                      KroMignonK Offline
                      KroMignonK Offline
                      KroMignon
                      wrote on 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)

                      1 Reply Last reply
                      0
                      • P Offline
                        P Offline
                        Phips04
                        wrote on 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

                        KroMignonK 1 Reply Last reply
                        0
                        • P Phips04

                          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

                          KroMignonK Offline
                          KroMignonK Offline
                          KroMignon
                          wrote on 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)

                          1 Reply Last reply
                          2
                          • P Offline
                            P Offline
                            Phips04
                            wrote on 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™„

                            KroMignonK 1 Reply Last reply
                            1
                            • P Phips04

                              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™„

                              KroMignonK Offline
                              KroMignonK Offline
                              KroMignon
                              wrote on 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 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‘

                                KroMignonK 1 Reply Last reply
                                1
                                • P Phips04

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

                                  KroMignonK Offline
                                  KroMignonK Offline
                                  KroMignon
                                  wrote on 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
                                  0

                                  • Login

                                  • Login or register to search.
                                  • First post
                                    Last post
                                  0
                                  • Categories
                                  • Recent
                                  • Tags
                                  • Popular
                                  • Users
                                  • Groups
                                  • Search
                                  • Get Qt Extensions
                                  • Unsolved