Qt Forum
    • Login
    • Search
    • Categories
    • Recent
    • Tags
    • Popular
    • Users
    • Groups
    • Search
    • Unsolved

    Update: Forum Guidelines & Code of Conduct

    Qt 5.1 and Android unable to start 'org.qtproject.example.myFirstAndroidApp'

    Mobile and Embedded
    6
    25
    17590
    Loading More Posts
    • 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.
    • A
      andrea993.93 last edited by

      I tried Qt 5.1 on Windows 8 and on Ubuntu 13.04. I'm trying to start an application for Android.
      I've set the Android parameters on settings and it compile without problems, but when I try to launch the application on the real device or on the emulator I get this error: "unable to start 'org.qtproject.example.myFirstAndroidApp'"
      I've tried with api level 10 and 17.
      Maybe I should install Ministro first?

      Thank you

      1 Reply Last reply Reply Quote 0
      • M
        Moster last edited by

        Maybe check adb logcat. It might give some more information than qt creator

        Ministro is not recommended for qt5.1

        1 Reply Last reply Reply Quote 0
        • S
          stereomatching last edited by

          [quote author="Moster" date="1372276286"]Maybe check adb logcat. It might give some more information than qt creator

          Ministro is not recommended for qt5.1[/quote]
          If ministro is not recommended, then we have a big problem
          We should package all of the libraries we need or wait for Qt5.2
          a full support for android

          1 Reply Last reply Reply Quote 0
          • A
            andrea993.93 last edited by

            I think that the problem is the qt library on device.
            logcat report:
            @E/Qt ( 977): Can't create main activity
            E/Qt ( 977): java.io.FileNotFoundException: /data/data/org.qtproject.example.prova0/lib/lib--Managed_by_Qt_Creator--plugins_platforms_libqoffscreen.so (No such file or directory)
            E/Qt ( 977): at org.apache.harmony.luni.platform.OSFileSystem.open(Native Method)
            E/Qt ( 977): at dalvik.system.BlockGuard$WrappedFileSystem.open(BlockGuard.java:232)
            E/Qt ( 977): at java.io.FileInputStream.<init>(FileInputStream.java:80)
            E/Qt ( 977): at java.io.FileInputStream.<init>(FileInputStream.java:132)
            E/Qt ( 977): at org.qtproject.qt5.android.bindings.QtActivity.createBundledBinary(QtActivity.java:366)
            E/Qt ( 977): at org.qtproject.qt5.android.bindings.QtActivity.extractBundledPluginsAndImports(QtActivity.java:386)
            E/Qt ( 977): at org.qtproject.qt5.android.bindings.QtActivity.startApp(QtActivity.java:436)
            E/Qt ( 977): at org.qtproject.qt5.android.bindings.QtActivity.onCreate(QtActivity.java:688)
            E/Qt ( 977): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
            E/Qt ( 977): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
            E/Qt ( 977): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
            E/Qt ( 977): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
            E/Qt ( 977): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
            E/Qt ( 977): at android.os.Handler.dispatchMessage(Handler.java:99)
            E/Qt ( 977): at android.os.Looper.loop(Looper.java:123)
            E/Qt ( 977): at android.app.ActivityThread.main(ActivityThread.java:3683)
            E/Qt ( 977): at java.lang.reflect.Method.invokeNative(Native Method)
            E/Qt ( 977): at java.lang.reflect.Method.invoke(Method.java:507)
            E/Qt ( 977): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
            E/Qt ( 977): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
            E/Qt ( 977): at dalvik.system.NativeStart.main(Native Method)
            @

            But this error occurs when I set "use qt library from device".
            If I set "Deploy local qt libraries" on the device I get an error which say that ministro is not installed.
            Then what should I do to install a qt project on Android?

            1 Reply Last reply Reply Quote 0
            • M
              Moster last edited by

              On qt5 you should use "Use Qt libraries from device" and also tick "Use local Qt libraries". Then the apk will include all the necessary libraries.
              Would you mind to share your source code of that example, with the .pro file?

              1 Reply Last reply Reply Quote 0
              • A
                andrea993.93 last edited by

                I already tried to check those options but the same error occurs.
                I'm trying to launch the hello world generated when I choose qt quick 2 application.

                1 Reply Last reply Reply Quote 0
                • A
                  andrea993.93 last edited by

                  If you had launched a qt application on android successfully can you tell me the operations that you had done?
                  thank you

                  1 Reply Last reply Reply Quote 0
                  • M
                    Moster last edited by

                    Im already working with it on android.

                    Can I know which smartphone you tried to use + android version?

                    Did you actually download the SDK and the android APIs?

                    Do you use the latest NDK?

                    Have you set OpenJDK location and also ant location?

                    1 Reply Last reply Reply Quote 0
                    • A
                      andrea993.93 last edited by

                      I have all this software and I have already set the paths, all this software is in the last version. I've downloaded all yesterday.
                      I can build the project so it work. I'm trying with the emulator (nexus 5), with API level 10 and 11.
                      there are not compile errors and the installation on device work correctly but when the application start I can see only a black screen,and the application output on qt creator tell that error.
                      I've tried with windows and Ubuntu, I've also formatted and reinstalled Ubuntu but it doesn't work.
                      I'm trying with qt quick 2 application.
                      which kind of project do you use?

                      1 Reply Last reply Reply Quote 0
                      • M
                        Moster last edited by

                        Im using an empty qt project and write the stuff on my own.

                        1 Reply Last reply Reply Quote 0
                        • A
                          andrea993.93 last edited by

                          Can you write me the code that works for you, please?. So I can try it

                          1 Reply Last reply Reply Quote 0
                          • M
                            Moster last edited by

                            Ok, here is a small project that only contains an exit button
                            The name is simpleWidget. Please test it on a real device.

                            simpleWidget.pro
                            @TEMPLATE = app
                            TARGET = simpleWidget

                            QT = core widgets gui

                            OTHER_FILES +=
                            android/version.xml
                            android/src/org/qtproject/qt5/android/bindings/QtActivity.java
                            android/src/org/qtproject/qt5/android/bindings/QtApplication.java
                            android/src/org/kde/necessitas/ministro/IMinistro.aidl
                            android/src/org/kde/necessitas/ministro/IMinistroCallback.aidl
                            android/res/values-el/strings.xml
                            android/res/values-nb/strings.xml
                            android/res/values-zh-rCN/strings.xml
                            android/res/values-id/strings.xml
                            android/res/values-ja/strings.xml
                            android/res/values-zh-rTW/strings.xml
                            android/res/values-de/strings.xml
                            android/res/values-fr/strings.xml
                            android/res/values-pl/strings.xml
                            android/res/values-ro/strings.xml
                            android/res/values-it/strings.xml
                            android/res/values-es/strings.xml
                            android/res/values-pt-rBR/strings.xml
                            android/res/values-fa/strings.xml
                            android/res/layout/splash.xml
                            android/res/values-rs/strings.xml
                            android/res/values-ms/strings.xml
                            android/res/values-et/strings.xml
                            android/res/values/strings.xml
                            android/res/values/libs.xml
                            android/res/values-nl/strings.xml
                            android/res/values-ru/strings.xml
                            android/AndroidManifest.xml

                            SOURCES +=
                            Main.cpp
                            window.cpp

                            HEADERS +=
                            window.h
                            @

                            main.cpp
                            @#include <QApplication>
                            #include <window.h>

                            int main(int argc, char** argv){

                            QApplication app(argc, argv);

Window window;

window.showMaximized();

return app.exec&#40;&#41;;

                            }@

                            window.cpp
                            @#include "window.h"
                            #include <QPushButton>
                            #include <QApplication>

                            Window::Window(QWidget *parent) :
                            QWidget(parent)
                            {
                            button = new QPushButton("Exit", this);

                                button->setGeometry(10,10, 300, 300);


    connect(button, SIGNAL(clicked()), QApplication::instance(), SLOT(quit()));

                            }
                            @

                            window.h
                            @#ifndef WINDOW_H
                            #define WINDOW_H

                            #include <QWidget>

                            class QPushButton;
                            class Window : public QWidget
                            {
                            Q_OBJECT
                            public:
                            explicit Window(QWidget *parent = 0);

                            signals:

                            public slots:

                            private:
                            QPushButton *button;

                            };

                            #endif // WINDOW_H
                            @

                            1 Reply Last reply Reply Quote 0
                            • L
                              linziwen last edited by

                              i have the same problem.i find out that the config of the emulator is bo be blamed.you can try to config it using "armeabi-v7a" instead of "armeabi",or just to choose the android-15 api or above.

                              1 Reply Last reply Reply Quote 0
                              • N
                                niks_android last edited by

                                I tried to run the Qt Quick 2 Application (Built in elements) on my android device (version 4.2.2) using API 17. It compiles successfully but on application output window i get this:
                                "Starting remote process.Unable to start 'org.qtproject.example.Sample2'."

                                On my device, i see a black screen.
                                In compile logs i see - "WARNING: No minSdkVersion value set. Application will install on all Android versions.", which seems to be favourable.

                                Can anyone suggest where am I going wrong?

                                1 Reply Last reply Reply Quote 0
                                • M
                                  Moster last edited by

                                  I have only tested this stuff on linux (ubuntu 12.04 and 13.04), talking about qtcreator. For me it runs great. What do you use?

                                  I guess usb debugging is turned on, otherwise it would try to start the emulator

                                  Maybe check adb logcat if it says more than qtcreator

                                  1 Reply Last reply Reply Quote 0
                                  • N
                                    niks_android last edited by

                                    I am using Qt Creator 2.7.2 based on Qt 5.1.0 on Windows7 32-bit OS.
                                    Yes, USB debugging is ON (I think that is a mandate)

                                    Firstly i want to make it work on the emulator.
                                    On that too, it displays the same error and black screen.

                                    AVD Manager settings: Data partition size: 1024 Mb
                                    AVD Target: API17
                                    CPU/ABI: armeabi-v7a

                                    1 Reply Last reply Reply Quote 0
                                    • M
                                      Moster last edited by

                                      What does "adb logcat" say when you try to run the app?

                                      1 Reply Last reply Reply Quote 0
                                      • A
                                        andrea993.93 last edited by

                                        Moster, which api Level do you use?

                                        1 Reply Last reply Reply Quote 0
                                        • M
                                          Moster last edited by

                                          17, since my devices run on 4.2.1 and 4.2.2, but Im using linux, since the windows version is supposed to be less stable

                                          1 Reply Last reply Reply Quote 0
                                          • N
                                            niks_android last edited by

                                            Moster,

                                            adb logcat shows the following error on start of application:

                                            E/Qt ( 1469): Can't create main activity
                                            E/Qt ( 1469): java.io.FileNotFoundException: /data/data/org.qtproject.example.Sample/lib/lib--Managed_by_Qt_Creator--plugins_platforms_android_libqtforandroid.so: open failed: ENOENT (No such file or directory)

                                            1 Reply Last reply Reply Quote 0
                                            • First post
                                              Last post