[Interest] Save / load file contents on android

[ekke]

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 set 
requestLegacyExternalStorage ATM

last weeks had much work moving all my projects from Qt 5.13.2 to 
5.15.5, 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 from Qt ;-)

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 <ekke at ekkes-corner.org 
>> <mailto:ekke at 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
>>> _______________________________________________
>>> Interest mailing list
>>> Interest at qt-project.org
>>> https://lists.qt-project.org/listinfo/interest
>> 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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>> Interest at qt-project.org <mailto:Interest at qt-project.org>
>> https://lists.qt-project.org/listinfo/interest 
>> <https://lists.qt-project.org/listinfo/interest>
>

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