How to start an Android activity in Java file from Qt

[Abin]

Hi all,

I need to start an activity which implements an interface from a third party library.

So I am writing a sample application to start activity. But I have no clue how to do it. :( ..

I have a button click slot:

void MainWindow::on_startButton_clicked()
{
    qDebug() << Q_FUNC_INFO << "Invoked";
    QAndroidJniObject intent;
    QtAndroid::startActivity(intent, 5, mpResultReceiver);
}

I don't know how to set intent so that it will refer to my activity.
mpResultReceiver is a pointer to ActivityResultReceiver Object.

//activityresultreceiver.h - I need to get some result from the activity...

#ifndef ACTIVITYRESULTRECEIVER_H
#define ACTIVITYRESULTRECEIVER_H

#include <QAndroidActivityResultReceiver>

class ActivityResultReceiver : public QAndroidActivityResultReceiver
{
public:
    ActivityResultReceiver();

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

#endif // ACTIVITYRESULTRECEIVER_H

//activityresultreceiver.cpp

#include "activityresultreceiver.h"
#include <QDebug>

ActivityResultReceiver::ActivityResultReceiver()
{

}

void ActivityResultReceiver::handleActivityResult(int receiverRequestCode,
                                                  int resultCode,
                                                  const QAndroidJniObject &data)
{
    qDebug() << Q_FUNC_INFO << "Invoked";
}

//ActivityClient.java -** in the path of androidmanifest.xml file path /src/org/abc/startActivity**

package org.abc.startActivity;

import android.util.Log;

public class ActivityClient extends org.qtproject.qt5.android.bindings.QtActivity
{
    private static ActivityClient m_instance;

    public ActivityClient()
    {
        m_instance = this;
    }

//    @Override
//    protected void onCreate(Bundle savedInstanceState) {
//        super.onCreate(savedInstanceState);
//        Log.d("ActivityClient", "on create");
//    }

}

Can somebody help to figure this out, as this is not near to any good work

[benlau]

I don't suggest to use JNI to initial an Activity. It is just too troublesome. Instead I will implement it in Java.

e.g:

    public void takePhoto() {
        Intent i = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);

        mRequestedPhotoPath = "";

        String timeStamp = new SimpleDateFormat("yyyy-MM-dd HH.mm.ss").format(new Date());

        File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);

        File image = new File(storageDir.getAbsolutePath() + "/" + timeStamp + ".jpg");
        i.putExtra(MediaStore.EXTRA_OUTPUT,Uri.fromFile(image));
        i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
        i.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        i.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
        mRequestedPhotoPath = image.getAbsolutePath();
     
        startActivityForResult(i, TAKE_PHOTO);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (resultCode == RESULT_OK) {
             if (requestCode == TAKE_PHOTO) {
                if (data == null && mRequestedPhotoPath != "") {
                    importFromPath(mRequestedPhotoPath);
                    addImageFileToGallery(mRequestedPhotoPath);
                    mRequestedPhotoPath = "";
                } else {
                    importMediaImage(data);
                }
            }
        }
    }

C++ side:

void AndroidActivity::takePhoto()
{
    QAndroidJniObject activity = QAndroidJniObject::callStaticObjectMethod("org/qtproject/qt5/android/QtNative", "activity", "()Landroid/app/Activity;");
    activity.callMethod<void>("takePhoto","()V");
}

[Abin]

@benlau Thanks for the post it helps .. :)

But how to send if there is a data onActivityResult() have that is to be sent to C++ side...

[benlau]

@Abin

Check my example code to register native call via JNI:

C++ :
qtandroidexamplecode/qtandroidrunner.cpp at master · benlau/qtandroidexamplecode

Java:

qtandroidexamplecode/QtRunner.java at master · benlau/qtandroidexamplecode