QT6 Android：与其他应用程序共享文件

问：

在 QT6 Android 应用程序中，我尝试共享文本文件，例如与 google drive 或 whatsapp 或邮件共享。 此时，我的代码打开了可能要共享的应用程序，但要附加的文件未发送，消息始终为空。

请参阅下面的代码，我认为与jniDocumentPath有关。 为了测试文件是否可读，我通过读取文件来测试它。

void myapp::shareTextDocument(const QString& documentPath)
{

    qDebug() << documentPath;
    QString m_downloadfilename;
    m_downloadfilename = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);

//test if file is readable -> result is positive 
    QFile inputFile(documentPath);
    if (inputFile.open(QIODevice::ReadOnly))
    {
        QTextStream in(&inputFile);
        while (!in.atEnd())
        {
            QString line = in.readLine();
            qDebug() << line;
        }
        inputFile.close();
    }
//text is readable.

  
    QJniObject jniDocumentPath = QJniObject::fromString(documentPath);

    // Create an Intent to share the text document
    QJniObject intent("android/content/Intent",
                             "(Ljava/lang/String;)V",
                             jniDocumentPath.object<jstring>());

    // Set the action and MIME type
    QJniObject action = QJniObject::getStaticObjectField<jstring>(
        "android/content/Intent", "ACTION_SEND");
    QJniObject mimeType = QJniObject::fromString("text/plain");
    intent.callObjectMethod(
        "setAction", "(Ljava/lang/String;)Landroid/content/Intent;", action.object());
    intent.callObjectMethod(
        "setType", "(Ljava/lang/String;)Landroid/content/Intent;", mimeType.object());

    // Get the current QtActivity and start the sharing activity
    QNativeInterface::QAndroidApplication::runOnAndroidMainThread
    ([intent]() {
        QJniObject currentActivity = QtAndroidPrivate::activity();
        QJniObject chooserIntent = QJniObject::callStaticObjectMethod(
            "android/content/Intent", "createChooser",
            "(Landroid/content/Intent;Ljava/lang/CharSequence;)Landroid/content/Intent;",
            intent.object(), QJniObject::fromString("Share via").object());
        currentActivity.callMethod<void>(
            "startActivity", "(Landroid/content/Intent;)V", chooserIntent.object());
    });
}

与whatsapp邮件或谷歌驱动器等其他应用程序共享文件... 所有共享文件的应用程序都弹出，选择正常，发送正常，但文件未附加

响应后。我已经用文件提供程序更改了代码。但 仍然有同样的问题。接收器应用程序（驱动器、电子邮件、whatsapp、 ...)在未找到数据的情况下进行响应。新代码下方

//Add in the AndroidManifest file

<application .......

        <provider android:name="androidx.core.content.FileProvider" android:authorities="org.my.myap.authority" android:exported="false" android:grantUriPermissions="true">
            <meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/filepaths"/>
        </provider>
        
</application>

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />
//        
        

//Add in the c++ code

void myApp::shareTextDocument(const QString& documentPath)
{
    QJniObject activity = QtAndroidPrivate::activity();
    QJniObject context = QtAndroidPrivate::context();

    QJniEnvironment env;
    QJniObject file = QJniObject::fromString(QDir::toNativeSeparators(documentPath));


    QString providerAuthority = "org.my.myap.authority";
    QJniObject provider = QJniObject::callStaticObjectMethod("androidx/core/content/FileProvider",
                                                             "getUriForFile",
                                                             "(Landroid/content/Context;Ljava/lang/String;Ljava/io/File;)Landroid/net/Uri;",
                                                             context.object(),
                                                             QJniObject::fromString(providerAuthority).object(),
                                                             file.object<jobject>());

    QJniObject intent("android/content/Intent");
    intent.callObjectMethod("setAction", "(Ljava/lang/String;)Landroid/content/Intent;", QJniObject::fromString("android.intent.action.SEND").object());
    intent.callObjectMethod("putExtra", "(Ljava/lang/String;Landroid/os/Parcelable;)Landroid/content/Intent;", QJniObject::fromString("android.intent.extra.STREAM").object(), provider.object());
    intent.callObjectMethod("setType", "(Ljava/lang/String;)Landroid/content/Intent;", QJniObject::fromString("application/octet-stream").object());


    QtAndroidPrivate::startActivity(intent.object(), 0);
}



//Add in the CMakefilelists.txt

if(ANDROID)
    set(ANDROID_XML_FILES android/res/xml/filepaths.xml)
    qt_add_resources(TARGET HyundaiMeteoQML SOURCES ${ANDROID_XML_FILES})
endif()
//

//The filspaths.xml
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="external_files" path="."/>
</paths>
//