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

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


  • 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

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

    Ministro is not recommended for qt5.1

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  • [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

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  • 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?

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  • 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?

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  • 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.

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

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  • 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?

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  • 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?

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

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

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  • 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
    @

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  • 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.

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  • 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?

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  • 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

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  • 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

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

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  • Moster, which api Level do you use?

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  • 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

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  • 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)

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  • What are your deploy configurations?

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  • Use Qt libraries from device - checked
    Use local Qt Libraries - checked
    Rest unchecked.

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  • Do you have a chance to test it on linux?

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  • I'm experiencing the same problem. However, during the deploy step i notice when it tries to install the apk to the emulator, it spits out the following error. This is on windows with almost the same setup.

    Error: Could not access the Package Manager. Is the system running?

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  • So, I fixed my problem. One I didn't have the emulator using the host gpu. Second, I wasn't giving the emulator enough time to boot up.

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