Qt Android image picker issue with Android > 5.5.1

[GBergamo]

Hi everyone,

I've tried to use this code (see the accepted answer) to create an image picker for Android in Qt (5.6):
http://stackoverflow.com/questions/34006608/qt-and-android-get-path-from-image-in-gallery/

It works perfectly on Android < 5.1.1. In newer versions (also Android 6) the returned string is always empty.

Here
http://stackoverflow.com/questions/30567217/android-5-1-1-lollipop-return-null-file-path-if-image-chosen-from-gallery

they suggest a workaround in java but I've some problems in translating it to qt c++ code.
In particular I need this method:

public static Uri handleImageUri(Uri uri) {
    Pattern pattern = Pattern.compile("(content://media/.*\\d)");
    if (uri.getPath().contains("content")) {
        Matcher matcher = pattern.matcher(uri.getPath());
        if (matcher.find())
            return Uri.parse(matcher.group(1));
        else
            throw new IllegalArgumentException("Cannot handle this URI");
    } else
        return uri;
}

Can someone help me?
Thank you.

[Schluchti]

@GBergamo Have you found a solution to this problem? In the stackoverflow link above someone mentions that it was a bug and the problem should be fixed with newer versions,. However, I am still getting the error with Android 6.

[GBergamo]

Hi, at the moment I'm using Qt c++ code and it works.

Here's the example:

void AndroidImagePicker::openPicker()
{
    QAndroidJniObject Intent__ACTION_PICK = QAndroidJniObject::getStaticObjectField("android/content/Intent", "ACTION_PICK", "Ljava/lang/String;");
    qDebug() << "AndroidImagePicker Intent__ACTION_PICK.isValid()=" << Intent__ACTION_PICK.isValid();

    QAndroidJniObject EXTERNAL_CONTENT_URI= QAndroidJniObject::getStaticObjectField("android/provider/MediaStore$Images$Media", "EXTERNAL_CONTENT_URI", "Landroid/net/Uri;");
    qDebug() << "AndroidImagePicker EXTERNAL_CONTENT_URI.isValid()=" << EXTERNAL_CONTENT_URI.isValid();

    QAndroidJniObject intent=QAndroidJniObject("android/content/Intent",
        "(Ljava/lang/String;Landroid/net/Uri;)V",
        Intent__ACTION_PICK.object<jstring>(),
        EXTERNAL_CONTENT_URI.object<jobject>()
    );

    qDebug() << "AndroidImagePicker intent.isValid()=" << intent.isValid();

    QtAndroid::startActivity(intent, 101, this);
}

void AndroidImagePicker::handleActivityResult(int receiverRequestCode, int resultCode, const QAndroidJniObject &data)
{
    jint RESULT_OK = QAndroidJniObject::getStaticField<jint>("android/app/Activity", "RESULT_OK");

    if( receiverRequestCode == 101 && resultCode == RESULT_OK )
    {
        QAndroidJniObject uri = data.callObjectMethod("getData", "()Landroid/net/Uri;");

        qDebug("AndroidImagePicker uri = %s", qPrintable(uri.toString()));

        QAndroidJniObject dadosAndroid = QAndroidJniObject::getStaticObjectField("android/provider/MediaStore$MediaColumns", "DATA", "Ljava/lang/String;");
        QAndroidJniEnvironment env;
        jobjectArray projecao = (jobjectArray)env->NewObjectArray(1, env->FindClass("java/lang/String"), NULL);
        jobject projacaoDadosAndroid = env->NewStringUTF(dadosAndroid.toString().toStdString().c_str());
        env->SetObjectArrayElement(projecao, 0, projacaoDadosAndroid);

        QAndroidJniObject contentResolver = QtAndroid::androidActivity().callObjectMethod("getContentResolver", "()Landroid/content/ContentResolver;");
        QAndroidJniObject nullObj;

        QAndroidJniObject cursor = contentResolver.callObjectMethod("query", "(Landroid/net/Uri;[Ljava/lang/String;Ljava/lang/String;[Ljava/lang/String;Ljava/lang/String;)Landroid/database/Cursor;", uri.object<jobject>(), projecao, nullObj.object<jstring>(), nullObj.object<jobjectArray>(), nullObj.object<jstring>());
        qDebug() << "AndroidImagePicker cursor.isValid()=" << cursor.isValid();

        jint columnIndex = cursor.callMethod<jint>("getColumnIndexOrThrow","(Ljava/lang/String;)I", dadosAndroid.object<jstring>());
        qDebug() << "AndroidImagePicker column_index=" << columnIndex;

        cursor.callMethod<jboolean>("moveToFirst");

        QAndroidJniObject path = cursor.callObjectMethod("getString", "(I)Ljava/lang/String;", columnIndex);
        qDebug() << "AndroidImagePicker path.isValid()=" << path.isValid();

        QString imagePath = "file://" +  path.toString();
        qDebug() << "AndroidImagePicker path" << imagePath;

        cursor.callMethod<jboolean>("close");

        emit imagePathRetrieved(imagePath);
    }
    else
        qWarning() << "AndroidImagePicker wrong path";
}

#ifndef ANDROIDIMAGEPICKER_H
#define ANDROIDIMAGEPICKER_H

#include <QObject>
#include <QtAndroidExtras>

#include <QDebug>

class AndroidImagePicker : public QObject, public QAndroidActivityResultReceiver
{
    Q_OBJECT

public:
    AndroidImagePicker();

    void openPicker();
    virtual void handleActivityResult(int receiverRequestCode, int resultCode, const QAndroidJniObject &data);

signals:
    void imagePathRetrieved(QString imagePath);
};

#endif // ANDROIDIMAGEPICKER_H