Open zxing barcode scanner via intent

[metaDom]

Hey guys,

I'd like to start the zxing barcode/qr scanner via an Intent on Android and then receive and parse the result via C++ Qt code.

https://github.com/zxing/zxing/wiki/Scanning-Via-Intent

I've made some attempts but for some reason I always just received a whitescreen.

Could anyone give it a try and share his results?

The Java code without Qt would be:

@public Button.OnClickListener mScan = new Button.OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent("com.google.zxing.client.android.SCAN");
intent.setPackage("com.google.zxing.client.android");
intent.putExtra("SCAN_MODE", "QR_CODE_MODE");
startActivityForResult(intent, 0);
}
};

public void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (requestCode == 0) {
if (resultCode == RESULT_OK) {
String contents = intent.getStringExtra("SCAN_RESULT");
String format = intent.getStringExtra("SCAN_RESULT_FORMAT");
// Handle successful scan
} else if (resultCode == RESULT_CANCELED) {
// Handle cancel
}
}
}@

Thanks in advance!

[metaDom]

Ok, I got the QR Scanner to start and can also receive results. Problem now is, I have to pass the results from the Java class to Qt...

[metaDom]

Current code without java file:

@ QAndroidJniObject Scanner;
QAndroidJniObject Package;
QAndroidJniObject Subject;
QAndroidJniObject Text;
QAndroidJniObject intent("android/content/Intent");

Scanner = QAndroidJniObject::fromString("com.google.zxing.client.android.SCAN");
Package = QAndroidJniObject::fromString("com.google.zxing.client.android");
Subject = QAndroidJniObject::fromString("SCAN_MODE");
Text = QAndroidJniObject::fromString("QR_CODE_MODE");
intent.callObjectMethod("addAction","(Ljava/lang/String;)Landroid/content/Intent;",Scanner.object<jstring>());
intent.callObjectMethod("setPackage","(Ljava/lang/String;)Landroid/content/Intent;",Package.object<jstring>());
intent.callObjectMethod("putExtra","(Ljava/lang/String;Ljava/lang/string;)Landroid/content/Intent;",Subject.object<jstring>(), Text.object<jstring>());
QtAndroid::startActivity(intent,123456);@

[malleeswarareddy]

me also facing same problem ,but iam trying like this result code got -1 ,but scanner result showing null.
class OnActivityResult : public QAndroidActivityResultReceiver
{
void handleActivityResult(int requestCode, int resultCode, const QAndroidJniObject & intent)
{
qDebug() << "**** " << requestCode << " : " << resultCode << "data" << intent.toString();

        if (requestCode == 12345)
        {
            if (resultCode != 0 && intent.isValid())
            {

                QAndroidJniObject jPackage;
                QAndroidJniObject jClass;
                QAndroidJniObject jresult;
                QAndroidJniObject jdata;

                jPackage = QAndroidJniObject::fromString("com.google.zxing.client.android");
                jClass =  QAndroidJniObject::fromString("com.google.zxing.client.android.SCAN");
                jresult = QAndroidJniObject::fromString("RESULT_OK");


                intent.callObjectMethod("setPackage"
                , "(Ljava/lang/String;)Landroid/content/Intent;"
                , jPackage.object<jstring>());

                intent.callObjectMethod("setAction"
                , "(Ljava/lang/String;)Landroid/content/Intent;"
                , jClass.object<jstring>());


                jdata=intent.callObjectMethod("getExtra"
                , "(Ljava/lang/String;)Landroid/content/Intent;"
                , jresult.object<jstring>());
                qDebug() << "DATA:" << jdata.toString() ;

// QAndroidJniObject result =
// intent.getObjectField<jstring>("SCAN_RESULT");
// QAndroidJniObject format =
// intent.getObjectField<jstring>("SCAN_RESULT_FORMAT");

// qDebug() << result.toString() << " : " << format.toString();
}
}
}
};

[EvanPan]

This post is deleted!

[tomaslov]

Hi,

I've successfully implemented zxing barcode scanning via intent from Qt. I don't think it's the proper way to do it, but it works.

I copied QtActivity.java and added some code in onActivityResult to get hold of the return values. I'm quite sure you can do this a cleaner way.

<code>
@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data)    {
    //Barcode results
    IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
    if (result != null)
    {
       barcodeData = result.getContents();
       Log.i(QtApplication.QtTAG, "Barcode activity result: data=" + barcodeData + ", formatName=" + result.getFormatName() + ", errorCorrectionLevel=" + result.getErrorCorrectionLevel());
       if (barcodeData == null) barcodeData = "#SC$SCAN_ABORT$SC#"; // Signal scan is finished, but with no data.
    }
   //Barcode results finished
    if (QtApplication.m_delegateObject != null && QtApplication.onActivityResult != null) {
        QtApplication.invokeDelegateMethod(QtApplication.onActivityResult, requestCode, resultCode, data);
        return;
    }
    if (requestCode == MINISTRO_INSTALL_REQUEST_CODE)
        startApp(false);
    super.onActivityResult(requestCode, resultCode, data);
}

</code>