[Android-development] Using Qt libs in native android app

[Harri Pasanen]

Hi,

As you have discovered, it depends on the type of classes you are trying to use.
I have plans to do something similar, but have not started.  

My guesses are:
I assume containers Strings and such would work.    Anything requiring an event loop might not work, this may include networking?

I was also hoping that QtCore would “just work”, but I was surprised that QStandardPaths is even part of QtCore, as that is obviously platform dependent.

Please post your experiences,

Harri


> On 02 Nov 2015, at 22:28, Shrikant Dhumal <teck.shri at gmail.com> wrote:
> 
> Hello there,
> 
> I have an unusual situation in terms of how one uses Qt API.
> 
> I have a native Android App (implemented using Android SDK) and I am replacing its business logic using Qt API. I do not want to change my UI that is written using native Android Java classes.
> 
> I plan to use some of the Qt backend classes (that is a requirement) so, I intend to use only QtCore (no UI or other Qt module).
> 
> One of the backend class I intend to use is, QStandardPaths.
> When I call following API's I get empty strings QStandardPaths::standardLocations(QStandardPaths::AppLocalDataLocation);
> QStandardPaths::standardLocations(QStandardPaths::AppDataLocation);
> 
> QStandardPaths::standardLocations(QStandardPaths::AppConfigLocation);
> 
> 
> 
> However, when I tried same API in Qt Android examples, I am getting non-null paths.
> 
> 
> 
> When I looked into the code of QStandardPaths for Android to understand the implementation, I realized that the QStandardPaths relies on presence of Qt activity class that is part of QPA (on Android). Is my understanding correct?
> 
> Note: getExternalFilesDir() method uses "QtAndroidPrivate::activity()" and "applicationContext()" to determine the paths.
> 
> 
> 
> Is there a means to successfully use Qt backend classes in a native Android App?
> 
> 
> 
> - Shrikant D
> 
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