What's the problem? android compile error

[Eddy]

Hi Jay_M,

Thanks for the solution! Now I can take the jump to Qt5.12.3 with my Android project

I tested your workarounds and the only thing you have to do is step 3:

3rd: go into theQT project/app's folder and edit the gradle.properties file... change the line to:

androidBuildToolsVersion=28.0.3

I tested on some test applications and also on a real world application
You saved me a lot of time! Now you can save some time for your other projects with less tweaking ;-)

Eddy

[nikich340]

@Eddy if you have build-tools 28.0.3 downloaded. I just deleted build-tools 29.0.0 and downloaded 28.0.3 (and do not change build folder - it configures for the only one 28.0.3 version which I have).

[Eddy]

Hi Nikich,

good find!

I just tested with a new project and deleting the 29.0.0 folder upfront makes Qt Creator find the 28.0.3 folder automatically.

Thanks for posting this back here ;-)

Eddy

[a.burks]

I have a similar problem. I followed the instructions of the tutorial for android and opened the analog clock example to build, deploy and start the app in the Android emulator.

I use Qt Creator for macOS with the newest suggested Qt versuin. I get following build errors:

/Users/burks/Library/Android/android-ndk-r20/toolchains/x86-4.9/prebuilt/darwin-x86_64/lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin/ld: error: cannot find -lc++
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [libshadereffects.so] Error 1

Some ideas, how to make a Qt app for Android running?

[JohnAmadis]

Hi,

I have exactly the same issue. Google Play Console requires adaptation for android-28 and arm64-v8a
from August 19, so QT developers cannot use r16b anymore and I have used NDK r20 instead. Unfortunatelly I received -lc++ library linking problem. I am not sure why, because the library is available in the expected path, and objdump returns correct armv7 architecture.

To solve the issue with linking I just used android-ndk-19c version. But note, that the 19c contains some bug with support of spaces in the QRC paths, so for example I had to remove this from the QRC:

make[1]: *** No rule to make target '/project/fonts/customfont/pobrano z /project/fonts/customfont/koikj.txt', needed by 'qrc_qml.cpp'.  Stop

[Albertino]

The error: cannot find -lc++ using ndk r20 can be solved like this:
https://codereview.qt-project.org/c/qt/qtbase/+/264903/9/mkspecs/android-clang/qmake.conf#34

For example to compile for android armv7 ndk r20, locate the file:
C:\Qt\5.13.0\android_armv7\mkspecs\android-clang\qmake.conf
and add the missing -nostdlib++
for android x86 (i use this for emulator), locate the file:
C:\Qt\5.13.0\android_x86\mkspecs\android-clang\qmake.conf

For error: Execution failed for task ':compileDebugAidl'
locate the file on your build directory, mine is: C:\dev_qt\experiments\build-test_qt_5_13_0_ARMv7-Release\android-build\gradle.properties and change androidBuildToolsVersion
from: androidBuildToolsVersion=29.0.0
to: androidBuildToolsVersion=28.0.3

[a.burks]

@Albertino Thank your very much. Now I can build and run the calculator example project with the emulator. That's very motivating. However I get many warnings in the log. Maybe the example projects are not optimized for Android. I will check the tutorial a hallo world project.

I zygote  : Not late-enabling -Xcheck:jni (already on)
W zygote  : Unexpected CPU variant for X86 using defaults: x86
W System  : ClassLoader referenced unknown path:
I QtCore  : Start
W linker  : "/data/app/org.qtproject.example.calculator-LvUUU6gyNuONt6Duq8qL_A==/lib/x86/libQt5Gui.so" has unsupported flags DT_FLAGS_1=0x80
W linker  : "/data/app/org.qtproject.example.calculator-LvUUU6gyNuONt6Duq8qL_A==/lib/x86/libQt5Widgets.so" has unsupported flags DT_FLAGS_1=0x80
W linker  : "/data/data/org.qtproject.example.calculator/qt-reserved-files/plugins/platforms/android/libqtforandroid.so" has unsupported flags DT_FLAGS_1=0x80
I Qt      : qt started
D OpenGLRenderer: HWUI GL Pipeline
I zygote  : Background concurrent copying GC freed 14726(1133KB) AllocSpace objects, 18(380KB) LOS objects, 52% free, 1407KB/2MB, paused 741us total 254.773ms
I zygote  : Do partial code cache collection, code=26KB, data=30KB
I zygote  : After code cache collection, code=25KB, data=30KB
I zygote  : Increasing code cache capacity to 128KB
I zygote  : Background concurrent copying GC freed 14025(1072KB) AllocSpace objects, 20(512KB) LOS objects, 50% free, 1491KB/2MB, paused 53.091ms total 112.459ms
I zygote  : Do partial code cache collection, code=50KB, data=56KB
I zygote  : After code cache collection, code=48KB, data=55KB
I zygote  : Increasing code cache capacity to 256KB
D         : HostConnection::get() New Host Connection established 0x9a107280, tid 5700
I zygote  : android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasWideColorDisplay retrieved: 0
I OpenGLRenderer: Initialized EGL, version 1.4
D OpenGLRenderer: Swap behavior 1
W OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
D OpenGLRenderer: Swap behavior 0

[Albertino]

@a.burks these are info/debug messages (not errors), QT is very verbose on android. You can ignore them

[Yerson]

@Albertino Gracias!! . estuve 2 semanas para arreglar ese error.

[Mahdi Bouafif]

This post is deleted!

[Mahdi Bouafif]

@Jay_M My friend i searched for your answer for seven days. I m extremely thankful to you

[iamOgunyinka]

@Jay_M Thank you very much, this worked for me!

[ali-aydin]

@Jay_M said in What's the problem? android compile error:

theQT project/app's folder and edit the gradle.properties file

where is " theQT project/app's folder and edit the gradle.properties file" file or directory?
i can't find it

[jsulm]

@ali-aydin said in What's the problem? android compile error:

where is " theQT project/app's folder

It's you project folder where the source code is.