any upto date instructions/cheat sheet to view a pdf on Android from a qt app, ala openurl() but for API 26+

testmonkey

Hello Folks

Just trying to open a pdf in android after I have saved it to QStandardPaths::standardLocations(QStandardPaths::AppDataLocation)/pdf/

followed https://www.qt.io/blog/2017/12/01/sharing-files-android-ios-qt-app and grabbed bits out the source for the ACTION_VIEW method.

Setup fileprovider in the AndroidManifest

but somethings not working...
taping/clicking the row in my tableview, downloads the pdf successfully and kicks off the pdf viewer, but its blank.

WIP code snip from mainwindow.cpp

TemporaryFile file(QDir::toNativeSeparators("./pdf/suiteQL-XXXXXX.pdf"));
file.setAutoRemove(false);
if (file.open()) {
        file.write(QByteArray::fromBase64(b64));
        file.close();

        // fails on android :(
        QDesktopServices::openUrl(QUrl("file:///" + file.fileName()));
       
        QUrl tmpUrl  = file.fileName();
        QString tmpStra =  tmpUrl.fileName();

        //uggg hard coded for now
        QAndroidJniObject jniPath=QAndroidJniObject::fromString("content://blahSuiteQL.fileprovider/mypdf/" + tmpStra);
        
        QAndroidJniObject jniUri = QAndroidJniObject::callStaticObjectMethod("android/net/Uri", "parse", "(Ljava/lang/String;)Landroid/net/Uri;", jniPath.object<jstring>());
        QAndroidJniObject jniParam = QAndroidJniObject::getStaticObjectField<jstring>("android/content/Intent", "ACTION_VIEW");
        QAndroidJniObject jniIntent("android/content/Intent","(Ljava/lang/String;)V",jniParam.object<jstring>());
        QAndroidJniObject jniType = QAndroidJniObject::fromString("application/pdf");
        QAndroidJniObject jniPermissions = 
        
        //fudged this in, not sure if it's correct.... also tried it without
        QAndroidJniObject::fromString("FLAG_GRANT_READ_URI_PERMISSION");
        QAndroidJniObject jniFlags = jniIntent.callObjectMethod("setFlags", "(Landroid/net/Uri;Ljava/lang/String;)Landroid/content/Intent;", jniPermissions.object<jstring>());
        //

        QAndroidJniObject jniResult = jniIntent.callObjectMethod("setDataAndType", "(Landroid/net/Uri;Ljava/lang/String;)Landroid/content/Intent;", jniUri.object<jobject>(), jniType.object<jstring>());
        QAndroidJniObject activity = QtAndroid::androidActivity();
        QAndroidJniObject packageManager = activity.callObjectMethod("getPackageManager",
                                                                     "()Landroid/content/pm/PackageManager;");
        QAndroidJniObject componentName = jniIntent.callObjectMethod("resolveActivity",
                                                                  "(Landroid/content/pm/PackageManager;)Landroid/content/ComponentName;",
                                                                  packageManager.object());
        QtAndroid::startActivity(jniIntent, 0);
        }

snip from AndroidManifest.xml

        <provider android:name="android.support.v4.content.FileProvider"
        android:authorities="blahSuiteQL.fileprovider"
        android:grantUriPermissions="true" android:exported="false">
        <meta-data android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/filepaths"/>
        </provider>
    </application>

res/xml/filepaths.xml

<paths>
    <files-path path="pdf/" name="mypdf" />
</paths>

meh stuck, with head ache :(

Any help or leads would be appreciated.

Just trying to open a test pdf pulled down and decoded from a netsuite restlet. (POST reply)

If I put it in QStandardPaths::standardLocations(QStandardPaths::DownloadLocation I can open it in file manager.

Kind Regards

Craig

testmonkey

@testmonkey said in any upto date instructions/cheat sheet to view a pdf on Android from a qt app, ala openurl() but for API 26+:

    //fudged this in, not sure if it's correct.... also tried it without
    QAndroidJniObject jniPermissions = QAndroidJniObject::fromString("FLAG_GRANT_READ_URI_PERMISSION");
    QAndroidJniObject jniFlags = jniIntent.callObjectMethod("setFlags", "(Landroid/net/Uri;Ljava/lang/String;)Landroid/content/Intent;", jniPermissions.object<jstring>());
    //

just pasted the comment in the wrong place on original post.

testmonkey

Hi Folks.... was calling the setFlags wrong.

this is the code I ended up with and working (tho no error checking atm)

        QAndroidJniObject path=QAndroidJniObject::fromString("content://blahSuiteQL.fileprovider/mypdf/" + tmpStra);
        QAndroidJniObject jniUri = QAndroidJniObject::callStaticObjectMethod("android/net/Uri", "parse", "(Ljava/lang/String;)Landroid/net/Uri;", path.object<jstring>());
        QAndroidJniObject jniParam = QAndroidJniObject::getStaticObjectField<jstring>("android/content/Intent", "ACTION_VIEW");
        QAndroidJniObject intent("android/content/Intent","()V");
                          intent.callObjectMethod("setAction","(Ljava/lang/String;)Landroid/content/Intent;",jniParam.object<jstring>());
        QAndroidJniObject jniType = QAndroidJniObject::fromString("application/pdf");
        jint jniPermissions =  QAndroidJniObject::getStaticField<jint>("android/content/Intent","FLAG_GRANT_READ_URI_PERMISSION");
                          intent.callObjectMethod("setFlags", "(I)Landroid/content/Intent;",jniPermissions);
                          intent.callObjectMethod("setDataAndType", "(Landroid/net/Uri;Ljava/lang/String;)Landroid/content/Intent;", jniUri.object<jobject>(), jniType.object<jstring>());
        QAndroidJniObject activity = QtAndroid::androidActivity();
        QAndroidJniObject packageManager = activity.callObjectMethod("getPackageManager","()Landroid/content/pm/PackageManager;");
                           intent.callObjectMethod("resolveActivity","(Landroid/content/pm/PackageManager;)Landroid/content/ComponentName;",packageManager.object());
        QtAndroid::startActivity(intent, 0);

Kind Regards
Craig