[Interest] How to make the QML gui be never stopped on Android

[Denis Shienkov]

Jérôme, Vadim,

I do not have any models and so on, I just need to render some
images/frames by grabbibg a content of some QML item, and

send it to UDP.


I am interested in a way how to do this in a background mode

(is it possible or not at all in Android?).

How about the TV-technology, when I can send, e.g. my video

from a smartphone to the TV via WIFI? How it does work on Android?

PS: And yes, I know, that a battery will be consumed, I do not ask about 
battery.

PS2: I am not an Android guru.


Denis


15.02.2018 18:43, Jérôme Godbout пишет:
>
> You can update your model, but the GUI itself should never be able to 
> render itself, else this might crash. The GUI will redraw only when 
> bring back to front. You should only touch your model or create a 
> queue of task to do when you go back up front. Running the main engine 
> Qml, not sure this is possible, but I might be wrong on this, maybe Qt 
> people can pitch in into this.
>
>
> You should have a C++ model or DB that hold the data until the 
> application is bring back to front to display those data.
>
> ------------------------------------------------------------------------
> *From:* Denis Shienkov <denis.shienkov at gmail.com>
> *Sent:* Thursday, February 15, 2018 10:00:54 AM
> *To:* interest at qt-project.org
> *Cc:* Jérôme Godbout
> *Subject:* Re: [Interest] How to make the QML gui be never stopped on 
> Android
>
> Hi Jérôme,
>
>
> > <meta-data android:name="android.app.background_running" 
> android:value="true"/>
>
>
> I already have this property in My manifect file.
>
>
> > That service will need to communicate with your application through intent I think. The service could try to wake 
> your application.
>
>
> I need to continue render/update for some dynamic QML GUI even when an 
> application goes to sleep.
>
>
> I don't know how to use a service to render a some GUI stuff, e.g. in 
> off-screen mode.
>
>
> Maybe I need to use a QTimer which will call the 
> QQuickWindow::update() method,
>
> I don't know...
>
>
> Denis.
>
>
> 15.02.2018 17:37, Jérôme Godbout пишет:
>>
>> Hi,
>>
>> I do the following for quick oauth2 background html handling:
>>
>> <meta-data android:name="android.app.background_running" 
>> android:value="true"/>
>>
>> inside the Qt activity tag of the AndroiManifest.xml
>>
>>
>> I wish it was easier to specify a single network activity that can 
>> continue into the background or at least a network intent that can 
>> wake the application up (could handle the message an/or bring 
>> application up front again).
>>
>>
>> I think you will need to create a service to have a full fledge UDP 
>> listener that continue even after the application screen goes off. 
>> That service will need to communicate with your application through 
>> intent I think. The service could try to wake your application. Not a 
>> specialist about this but this might help, good luck and let us known 
>> how you did solve it, I'm curious about all this, this still a pain 
>> to make those work properly.
>>
>> ------------------------------------------------------------------------
>> *From:* Interest <interest-bounces+godboutj=amotus.ca at qt-project.org> 
>> <mailto:interest-bounces+godboutj=amotus.ca at qt-project.org> on behalf 
>> of Denis Shienkov <denis.shienkov at gmail.com> 
>> <mailto:denis.shienkov at gmail.com>
>> *Sent:* Thursday, February 15, 2018 9:25:38 AM
>> *To:* interest at qt-project.org <mailto:interest at qt-project.org>
>> *Subject:* [Interest] How to make the QML gui be never stopped on 
>> Android
>>
>> Hi all,
>>
>> I use QML and Qt 5.9.3 on my Android application.
>>
>> I achieved some tricks that my application continued to
>> work when the smartphone goes to sleep or when the user
>> presses the 'power' button, i.e. seems, that an
>> application running in background mode.
>>
>> I do not use an Android service here (because I dont
>> know how to do it, also I'm not sure that this will help).
>>
>> So, when the application goes to background mode,
>> I see that it continues to work, because I see that
>> my UDP "keep-alive" messages are sends and receives.
>>
>> But, A MAIN problem is that a QML GUI is stopped then...
>> i.e. does not updates.
>>
>> I need to do GUI grabbing in a real time and send it
>> to UDP in any case.
>>
>> Is it possible to make a GUI work forewer?
>>
>> BR,
>> Denis
>>
>>
>

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