Qt Android image picker issue with Android > 5.5.1



  • 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.



  • @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.



  • 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
    

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