Re: [Interest] Save / load file contents on android

ekke Fri, 03 Sep 2021 06:55:02 -0700

Am 03.09.21 um 14:51 schrieb Jérôme Godbout:

Take care with the eternal storage opt out will no more be possibleafter November. We will need to target SDK 12 to publish to the store.So the 11 opt out flag will no more be possible (November for existingapplication, for new application it’s already started since august).

... and thanks to fixed QTBUG-71590 we can target this soon

Try to push an update asap so your user can migrate the data to theapplication proper folder. Other application cannot access the filesanymore. If your file are already into the application data folder youdo not have to worry much you still can access them easily.

fortunately most of my apps only use data inside application data, but 2of my apps need access to external storage, so I have to fix this in october

But the QStandard path have work fine for us so far. You can checkthe actual path it resolve to on this page (scroll a bit down to seethe path for Android):

https://doc.qt.io/qt-5/qstandardpaths.html#StandardLocation-enum<https://doc.qt.io/qt-5/qstandardpaths.html#StandardLocation-enum>

*From: *Interest <interest-boun...@qt-project.org> on behalf of ekke<e...@ekkes-corner.org>

*Date: *Friday, September 3, 2021 at 5:47 AM
*To: *Nuno Santos <nuno.san...@imaginando.pt>
*Cc: *Qt Interest <interest@qt-project.org>
*Subject: *Re: [Interest] Save / load file contents on android

Hi Nuno,

Am 03.09.21 um 11:05 schrieb Nuno Santos:

    Ekke,

    I have been experiencing some inconsistencies with Android file
    access using QStandardPaths, mostly now that I’m preparing the
    ground for Android 11 support. From Android 11 onwards, there will
    be changes in the way an app can access filesystem resources.

    This problem started when one of apps was in some systems using
    legacy file access while in others was already using the new
    storage approach. In order to temporary fixes this issues I have
    set the requestLegacyExternalStorage to true, however, soon this
    will end as in Android 11 it will be ignored.

I'm in the same situation as you ;-) have setrequestLegacyExternalStorage ATM

last weeks had much work moving all my projects from Qt 5.13.2 to5.15.5, so I can prepare for Qt 6.2


now there will be 3 weeks vacation

then support of Android 11 file storage will be high on my TODO list

... and hoping then to find some docs / tips HowTo support this fromQt ;-)


ekke

    One of the current challenges I’m facing the moving/copying
    resources from legacy storage to new storage when using
    QStandardPaths and QFileDialog.

    How have you been handling Android 11 support and data migration
    from older versions?

    Are you able to do it just with Qt stuff or do you need to handle
    some of the things with native android API’s?

    Thanks!

    Nuno

        On 31 Aug 2021, at 13:38, ekke <e...@ekkes-corner.org
        <mailto:e...@ekkes-corner.org>> wrote:

        Am 31.08.21 um 14:12 schrieb Wilhelm Meier via Interest:

            Hi all,

            does anybody have a minimum working example how to load / save json 
file

            contents (auscii contents) to / from a file on android.

            I made several attempts, but I get weird filenames and I'm not able 
to

            load the stored file.

            thx

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        Hi,

        some snippets HowTo save a JSON. use QVariantMap for a JSON
        Object or QVariantList for JSON Array

            QJsonDocumentjda=QJsonDocument::fromVariant(myQVariantMap);

        QByteArraybuffer=jda.toJson();

        saveTestFile("_my_test.json",buffer);

        ...

        
voidDataServer::*saveTestFile*(constQString&fileName,constQByteArray&buffer)

        {

        QStringfilePath=mDataManager->dataPath(fileName);

        QFilesaveFile(filePath);

        if(!saveFile./open/(QIODevice::WriteOnly)){

        qWarning()<<"Couldn't open file to write "<<filePath;

        return;

        }

        qint64bytesWritten=saveFile.write(buffer);

        saveFile./close/();

        qDebug()<<"Bytes written: "<<bytesWritten<<" to: "<<filePath;

        }

        ....

        //Android:AppDataLocationworksoutofthebox,iOSyoumustcreatetheDIRfirst!!

        
mDataRoot=QStandardPaths::standardLocations(QStandardPaths::AppDataLocation).value(0);

        mDataPath=mDataRoot+"/data/";

        ----

        and reading is similar

            jda=QJsonDocument::fromJson(dataFile.readAll());

        dataFile./close/();

        if(!jda.isArray()){

        myMap = jda.toVariant().toMap();

        } else {

            myList=jda.toVariant().toList();

            }

        -----

        hope it helps

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Re: [Interest] Save / load file contents on android

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