Qt with 3rd party SDK

liewjls

Hi,

I'm developing an application on a customized tablets which has a barcode scanner. I got the sdk from the manufacturer and the sdk is using Java. I had googled around, I understand I can use QAndroidJniObject to load the java sdk for my application. But I don't really use JNI before. The sdk i got from the manufacturer has libSerial.so and sdk.jar. I'm bit stuck how do i add and point my app to the sdk? Most of the examples i found from google and qt webpage, are loading the .java files directly to the project. can't find any useful info using .jar.

I wrote a dummy Dialog Window and I have a scan button.


void MainWindow::on_scanBarcode_clicked()
{
    qDebug() <<"Scan button clicked.";
    QAndroidJniObject testObject = QAndroidJniObject::callStaticObjectMethod("com/xxxxx/support/openapi/StBarcodeScanner", "getInstance", "()Lcom/xxxx/support/openapi/StBarcodeScanner;");
  //  QAndroidJniObject scanResult = QAndroidJniObject::callMethod("com/xxxxx/support/openapi/StBarcodeScanner", "scan",);

    if(testObject.isValid()){
        qDebug() <<"testObject is valid...";
    } else{
        qDebug() <<"testObject is invalid..";
    }

}

This is my .pro file

#-------------------------------------------------
#
# Project created by QtCreator 2016-09-16T12:26:49
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
QT += androidextras

TARGET = untitled
TEMPLATE = app


SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui

CONFIG += mobility
MOBILITY = 


ANDROID_PACKAGE_SOURCE_DIR = $$PWD/android/libs/

DISTFILES += \
    android/libs/sdk.jar \
    android/libs/libSerial.so \
    android/libs/AndroidManifest.xml \
    android/libs/gradle/wrapper/gradle-wrapper.jar \
    android/libs/gradlew \
    android/libs/res/values/libs.xml \
    android/libs/build.gradle \
    android/libs/gradle/wrapper/gradle-wrapper.properties \
    android/libs/gradlew.bat

contains(ANDROID_TARGET_ARCH,armeabi-v7a) {
    ANDROID_EXTRA_LIBS = \
        $$PWD/android/libs/libSerial.so
}

When i pressed the button, the "testObject is invalid..." is printed. Anyone can point me to right place please?

thanks.

regards,
jen