How to write files to an Android device using Qt?

user_6635665 0
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I have problems creating and writing files to an Android device in Qt. I have unsuccessfully tried a few different examples.

This example should write to the internal storage's Download folder:

QString path = QStandardPaths::writableLocation(QStandardPaths::DownloadLocation);

qDebug() << path; // '/storage/emulated/0/Download'
qDebug() << "Exists? " << QFile::exists(path + "/401891.png"); // This is an existing image in the folder, returns true

QFile testFile(path.append("/Testing.txt"));
testFile.open(QFile::WriteOnly);

QTextStream out(&testFile);
out << "Hello";

testFile.close();
qDebug() << "Exists? " << QFile::exists(path + "/Testing.txt"); // Returns false

I get this warning:

Warning: QIODevice::write (QFile, "/storage/emulated/0/Download/Testing.txt"): device not open

What I am missing and how to fix it?

qt android file
2 Answers

Seems like the permissions were not being applied although they were stated in Manifest.

Go to Settings -> Applications -> Application Manager

Find your application and ensure the 'Storage' permission toggle is 'On'.

user_66356650

You are wrong in a last line, it gives:

.../Download/Testing.txt/Testing.txt/

use

qDebug() << "Exists? " << QFile::exists(testFile.fileName()); // Returns true
user_70521860
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