qt-everywhere-src-5.15.1/qtandroidextras/examples/androidextras/customactivity/activityhandler.cpp

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#include "activityhandler.h"

#include <QAndroidIntent>

const int REQUEST_CODE = 123;
const jint RESULT_OK = QAndroidJniObject::getStaticField<jint>("android/app/Activity", "RESULT_OK");
ActivityHandler *ActivityHandler::m_instance = nullptr;

ActivityHandler::ActivityHandler(QObject *parent) : QObject(parent)
{
    m_instance = this;
}

void ActivityHandler::showSecondActivity()
{
    QAndroidIntent activityIntent(QtAndroid::androidActivity().object(),
                                  "org/qtproject/example/activityhandler/CustomActivity");

    QtAndroid::startActivity(
            activityIntent.handle(), REQUEST_CODE,
            [this](int requestCode, int resultCode, const QAndroidJniObject &data) {
                activityReceiver(requestCode, resultCode, data);
            });
}

void ActivityHandler::activityReceiver(int requestCode, int resultCode, const QAndroidJniObject &data)
{
    if (requestCode == REQUEST_CODE) {
        if (resultCode == RESULT_OK) {
            const QAndroidJniObject key = QAndroidJniObject::fromString("message");
            const QAndroidJniObject message = data.callObjectMethod(
                    "getStringExtra", "(Ljava/lang/String;)Ljava/lang/String;", key.object());
            if (message.isValid())
                emit ActivityHandler::instance()->receiveFromActivityResult(message.toString());
        } else {
            emit ActivityHandler::instance()->receiveFromActivityResult("Rejected!");
        }
    }
}