[Interest] Little help with Qt for Android under Linux

[Bob Hood]

On 5/15/2015 10:04 PM, Igor Mironchik wrote:
> Hi,
>
> I encountered this problem on Windows, but I think that this is the same 
> problem...
>
> The main problem is that that QtCreator wait 5 seconds for Android SDK for 
> answer of available supported platforms... Try to close QtCreator, delete 
> .user file and open and configure project again.
>
> If you computer is slow as my then you will receive correctly configured 
> project somewhere in third time. Just open .user file and look what 
> QtCreator wrote about Android platform... If there is android--1 then try 
> again, if you will see something like android-21 or android-16 then 
> everything is ok...

Thanks for the help, Igor.  I've solved it, but it turns out to be kind of 
strange.

First, Creator gave me this output whenever I loaded the project:

/bin/sh: 1: 
/opt/android/ndk/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc: 
not found
     Project ERROR: You need to set the ANDROID_NDK_ROOT environment variable 
to point to your Android NDK.
     Could not read qmake configuration file 
/opt/Qt5.4.1/5.4/android_armv7/mkspecs/android-g++/qmake.conf.
     Error while parsing file 
/opt/Qt5.4.1/Examples/Qt-5.4/quick/demos/stocqt/stocqt.pro. Giving up.

even though the ANDROID_NDK_ROOT variable /is/set in the environment (via the 
/etc/bash.bashrc file, so it is global):

ANDROID_NDK_ROOT=/opt/android-ndk-r10e

I noticed that Creator, having completely ignored the variable it was 
demanding, was looking for the NDK in some default location 
("/opt/android/ndk").  However, when you extract the SDK and the NDK, it 
places them into their own distinct folders:

     bob at bob-virtual-machine /opt $ l
     total 28K
     drwxr-xr-x  7 root root 4.0K May 16 12:19 ./
     drwxr-xr-x 22 root root 4.0K May 15 14:39 ../
     drwxr-xr-x  8 bob  bob  4.0K May 15 16:13 Qt5.4.1/
     drwxr-xr-x  2 root root 4.0K May 16 07:11 android.bob/
     drwxr-xr-x 10 bob  bob  4.0K May  5 03:49 *android-ndk-r10e/*
     drwxrwxr-x 13 bob  bob  4.0K May 15 16:18 *android-sdk-linux/*
     ...

So, to get around Creator's apparent brain damage, I created the /opt/android 
folder, and made symlinks in there to the SDK and NDK:

     bob at bob-virtual-machine /opt/android $ l
     total 8.0K
     drwxr-xr-x 2 bob  bob  4.0K May 16 07:11 ./
     drwxr-xr-x 7 root root 4.0K May 16 12:24 ../
     lrwxrwxrwx 1 bob  bob    21 May 16 07:11 *ndk -> /opt/android-ndk-r10e/*
     lrwxrwxrwx 1 bob  bob    22 May 16 07:11 *sdk -> /opt/android-sdk-linux/*

which has made Creator happy, and I'm not able to build and deploy the 
examples to my phone.  :)

Perhaps the tutorials need to be updated.
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