How to get file path from fileurl in qt android

[HemantSuryawanshi]

I am working on qt 5.14.1 with ndk version 21 and sdk version 28. I want to open a kml file using file dialog in qt android. I get a fileurl from file dialog like this,

"content://com.android.externalstorage.documents/document/primary%3Adocuments%2FAeroGCS%2FAeroGCSWorkspace%2FAbc5%2FBbb%2FBbb.kml"

but I didnt know how to convert this url into simple path and read the data from file. Please tell me how can I convert this url into proper android path.

[JonB]

@HemantSuryawanshi
I don't know anything about Android, but did you try passing that string to QFile() directly? Or, what about via QString QUrl::toLocalFile() const? Just a thought, may not help....

[HemantSuryawanshi]

@JonB yes I tried but its giving message that the file is not found.

[Soviet-Ball]

@HemantSuryawanshi
Hi,
maybe you can try this function below.

static QString getRealPathFromUri(const QUrl &url)
{
    QString path = "";

    QFileInfo info = QFileInfo(url.toString());
    if(info.isFile())
    {
        QString abs = QFileInfo(url.toString()).absoluteFilePath();
        if(!abs.isEmpty() && abs != url.toString() && QFileInfo(abs).isFile())
        {
            return abs;
        }
    }
    else if(info.isDir())
    {
        QString abs = QFileInfo(url.toString()).absolutePath();
        if(!abs.isEmpty() && abs != url.toString() && QFileInfo(abs).isDir())
        {
            return abs;
        }
    }
    QString localfile = url.toLocalFile();
    if((QFileInfo(localfile).isFile() || QFileInfo(localfile).isDir()) && localfile != url.toString())
    {
        return localfile;
    }
#ifdef Q_OS_ANDROID
    QJniObject jUrl = QJniObject::fromString(url.toString());
    QJniObject jContext = QtAndroidPrivate::context();
    QJniObject jContentResolver = jContext.callObjectMethod("getContentResolver", "()Landroid/content/ContentResolver;");
    QJniObject jUri = QJniObject::callStaticObjectMethod("android/net/Uri", "parse", "(Ljava/lang/String;)Landroid/net/Uri;", jUrl.object<jstring>());
    QJniObject jCursor = jContentResolver.callObjectMethod("query", "(Landroid/net/Uri;[Ljava/lang/String;Ljava/lang/String;[Ljava/lang/String;Ljava/lang/String;)Landroid/database/Cursor;", jUri.object<jobject>(), nullptr, nullptr, nullptr, nullptr);
    QJniObject jScheme = jUri.callObjectMethod("getScheme", "()Ljava/lang/String;");
    QJniObject authority;
    if(jScheme.isValid())
    {
        authority = jUri.callObjectMethod("getAuthority", "()Ljava/lang/String;");
    }
    if(authority.isValid() && authority.toString() == "com.android.externalstorage.documents")
    {
        QJniObject jPath = jUri.callObjectMethod("getPath", "()Ljava/lang/String;");
        path = jPath.toString();
    }
    else if(jCursor.isValid() && jCursor.callMethod<jboolean>("moveToFirst"))
    {
        QJniObject jColumnIndex = QJniObject::fromString("_data");
        jint columnIndex = jCursor.callMethod<jint>("getColumnIndexOrThrow", "(Ljava/lang/String;)I", jColumnIndex.object<jstring>());
        QJniObject jRealPath = jCursor.callObjectMethod("getString", "(I)Ljava/lang/String;", columnIndex);
        path = jRealPath.toString();
        if(authority.isValid() && authority.toString().startsWith("com.android.providers") && !url.toString().startsWith("content://media/external/"))
        {
            QStringList list = path.split(":");
            if(list.count() == 2)
            {
                QString type = list.at(0);
                QString id = list.at(1);
                if(type == "image")
                    type = type + "s";
                if(type == "document" || type == "documents")
                    type = "file";
                if(type == "msf")
                    type = "downloads";
                if(QList<QString>({"images","video","audio"}).contains(type))
                    type = type + "/media";
                path = "content://media/external/"+type;
                path = path + "/" + id;
                return getRealPathFromUri(path);
            }
        }
    }
    else
    {
        QJniObject jPath = jUri.callObjectMethod("getPath", "()Ljava/lang/String;");
        path = jPath.toString();
    }

    if(path.startsWith("primary:"))
    {
        path = path.remove(0,QString("primary:").length());
        path = "/sdcard/" + path;
    }
    else if(path.startsWith("/document/primary:"))
    {
        path = path.remove(0,QString("/document/primary:").length());
        path = "/sdcard/" + path;
    }
    else if(path.startsWith("/tree/primary:"))
    {
        path = path.remove(0,QString("/tree/primary:").length());
        path = "/sdcard/" + path;
    }
    else if(path.startsWith("/storage/emulated/0/"))
    {
        path = path.remove(0,QString("/storage/emulated/0/").length());
        path = "/sdcard/" + path;
    }
    else if(path.startsWith("/tree//"))
    {
        path = path.remove(0,QString("/tree//").length());
        path = "/" + path;
    }
    if(!QFileInfo(path).isFile() && !QFileInfo(path).isDir() && !path.startsWith("/data"))
        return url.toString();
    return path;
#else
    return url.toString();
#endif

}

[ekkescorner]

@Soviet-Ball you don't need this anmore in Qt 6.6:
FileDialog on Android supports content URLs.

QFileInfo().fileName()

gives you the file path
so easy now :)