Cant get the correct filepath from FileDialog in Android

[Amanda1102]

I am using FileDialog with qt 5.13.1 to save a file in my application directory. The problem is that the path of the file does not contains the correct name of the file and I need it.

Here is my qml code

import QtQuick 2.12
import QtQuick.Controls 2.12
import QtQuick.Dialogs 1.2

ApplicationWindow {
    id: mRoot
    visible: true
    width: 400
    height: 300

    Button{
        id: mButtonSaveFiles

        anchors.centerIn: parent

        height: 50
        width: 100

        text: "Save File"

        onClicked: mFileDialog.open()
    }

    FileDialog{
        id: mFileDialog

        nameFilters: ["Compressed files(*bz2)"]

        onAccepted: mFileManager.saveFile(mFileDialog.fileUrl)
    }
}

Here is my c++ function:

bool FileManager::saveFile(QString fileUrl) {
  qDebug() << "File url:" << fileUrl;

  int start = fileUrl.indexOf(QDir::separator()) + 1;
  int length = fileUrl.length() - start;
  QString filename = fileUrl.mid(start, length);

  QFile file(fileUrl);
  if (!file.copy(m_dir.path() + QDir::separator() + filename))
    return false;

  return true;
}

It works just fine in desktop, but in android I am getting this fileUrl:
"content://com.android.providers.downloads.documents/document/152"

So my file is being saved as 152, but I need it to be saved with the original name.

Does anyone know how I can get the correct name?

[Quang Phu]

@Amanda1102 ,
I use this config for 3 platforms:

#ifdef ANDROID_PLATFORM
    m_currentDir = QStandardPaths::writableLocation(QStandardPaths::AppDataLocation);
    qDebug() << "Android writable location ... " + QStandardPaths::writableLocation(QStandardPaths::AppDataLocation);
#elif IOS_PLATFORM
    m_currentDir = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
#else
    m_currentDir = QDir::currentPath();
#endif

It's worked well for both C++ and QML. You can try it!
QFile file(m_currentDir + QDir::separator() + filename);

[Amanda1102]

Thank you for your help @Quang-Phu, but that isn't my problem. The problem is that I have a file inside a android directory and I wanna save it inside my app directory, but I am not getting the correct name. For example, my filename is android-file, but I am getting 151 as the name. The thing is that it is using a uri link and I need to get the name of the file based on the uri.

[jsulm]

@Amanda1102 said in FileDialog in Android:

and I wanna save it inside my app directory

I don't think your app has write access in the directory where it is installed. Why do you want to write there?

[Amanda1102]

I did solve the problem partially by creating a java class and calling it from c++. Unfortunally this doesn't work with OneDrive.

Here is the java code I found in the internet:

package br.com.myjavapackage;

import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.webkit.MimeTypeMap;
import android.provider.OpenableColumns;

public class PathUtil {

    public static String getFileName(Uri uri, Context context) {
        String fileName = getFileNameFromCursor(uri, context);

        if (fileName == null) {
            String fileExtension = getFileExtension(uri, context);
            fileName = "temp_file" + (fileExtension != null ? "." + 
                                                        fileExtension : "");
        } else if (!fileName.contains(".")) {
            String fileExtension = getFileExtension(uri, context);
            fileName = fileName + "." + fileExtension;
        }

        return fileName;
    }

    public static String getFileExtension(Uri uri, Context context) {
        String fileType = context.getContentResolver().getType(uri);
        return MimeTypeMap.getSingleton().getExtensionFromMimeType(fileType);
    }

    public static String getFileNameFromCursor(Uri uri, Context context) {
        Cursor fileCursor = context.getContentResolver().query(uri, new String[] 
                               {OpenableColumns.DISPLAY_NAME}, null, null, null);
        String fileName = null;
        if (fileCursor != null && fileCursor.moveToFirst()) {
            int cIndex = fileCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
            if (cIndex != -1) {
                fileName = fileCursor.getString(cIndex);
            }
        }
        return fileName;
    }
}

Here is the way I call it on my c++ function:

  QAndroidJniObject uri = QAndroidJniObject::callStaticObjectMethod(
      "android/net/Uri", "parse", "(Ljava/lang/String;)Landroid/net/Uri;",
      QAndroidJniObject::fromString(fileUrl).object<jstring>());

  QString filename =
      QAndroidJniObject::callStaticObjectMethod(
          "br/com/myjavapackage/PathUtil", "getFileName",
          "(Landroid/net/Uri;Landroid/content/Context;)Ljava/lang/String;",
          uri.object(), QtAndroid::androidContext().object())
          .toString();

I am marking this problem as solved, but if anyone find a better solution please share it!

[ekkescorner]

@Amanda1102 perhaps you can get some ideas from my share example, where I try to get the file uri from a content uri
https://github.com/ekke/ekkesSHAREexample/blob/master/android/src/org/ekkescorner/examples/sharex/QShareActivity.java
https://github.com/ekke/ekkesSHAREexample/blob/master/android/src/org/ekkescorner/utils/QSharePathResolver.java
don't know if it helps or if it works with OneDrive

[wimalopaan]

Using java to solve this problem is very weird.

Isn't there a true Qt/QML solution?