@Regex_brave Use lambdas (new style syntax) e.g. if you want to pass different parameters from signal to slot. Example: // member variables QPushButton *pb1, *pb2 pb1 = new QPushButton(this); pb1->setObjectName("PushButton #1"); pb2 = new QPushButton(this); pb2->setObjectName("PushButton #2"); connect(pb1, &QPushButton::clicked, this, &MainWindow::pushButtonClicked); connect(pb2, &QPushButton::clicked, this, &MainWindow::pushButtonClicked); connect(pb1, &QPushButton::clicked, this, []() { qDebug() << "A button was clicked, but *still* do not know which button"; }); // lambda connect(pb2, &QPushButton::clicked, this, []() { qDebug() << "A button was clicked, but *still* do not know which button"; }); // lambda connect(pb1, &QPushButton::clicked, this, [this]() { pushButtonClicked(pb1); }); // lambda connect(pb2, &QPushButton::clicked, this, [this]() { pushButtonClicked(pb2); }); // lambda void MainWindow::pushButtonClicked(bool checked = false) { qDebug() << "A button was clicked, but do not know which button"; } void MainWindow::pushButtonClicked(QPushButton *pb) { qDebug() << "Button was clicked, objectName:" << pb->objectName(); }

I just stumbled accros the same odd behavior with Qt 5.7.1. However, the strange thing is, that it seems to be only a problem on android (on windows it's fine). Does anybody know if that's a (already reported) bug?

@mrjj Thanks :)

@errolflynn You should write self.button1.clicked.connect(ft_handler) - this will register the function ft_handler as a slot for the clicked signal. On http://doc.qt.io/qt-5/qabstractbutton.html you see that the signature of that signal is void clicked(bool checked). In other words, when the signal is activated, your handler is called as ft_handler(checked) where checked is either True or False. Per the signature of the clicked signal, this is the only information you will get out of the signal. If you want to pass additional parameters, you indeed will need to create a separate function that encodes those extra parameters and passes them to the handler. In Python it makes a lot of sense to use a lambda for it, for instance: self.button1.clicked.connect(lambda checked: fct_handler(par1, par2, par3, checked)) Hope this helps