Question

我的问题很直截了当（我只是个玩玩的休闲编码员）。我已经建立了与API的连接，并且通过RxJava的魔力，我可以订阅API发出的json数据。我还使用FXML创建了一个非常基本的GUI。

每次通过订阅发出事件时，如何使TextArea = textAreaA中的文本更新？换句话说，如何使TextArea显示API提要？

我从头到尾都阅读了RxJavaFx指南，它似乎更关注事件从Fx到Rx的定向流：（

这是我的代码示例：

    public class Tester extends Application{

    private static final Logger LOG = LoggerFactory.getLogger(Tester.class);

    public static void main(String[] args) throws IOException, InterruptedException{

        launch(args);

    }

    public void start (Stage primaryStage) throws Exception {
        FXMLLoader loader = new FXMLLoader(getClass().getResource("sample.fxml"));
        Parent root = loader.load();

        primaryStage.setTitle("App Window");
        primaryStage.setScene(new Scene(root, 300, 275));
        primaryStage.show();


        TESTER_API.TESTER_API_Connector();       


    }

}

    public class TESTER_API {

    public static void TESTER_API_Connector() throws IOException, InterruptedException {
        StreamingEvents emissions = StreamingEventsFactory.INSTANCE.createEvents(TheseStreamingEvents.class.getName());     
        emissions.connect().blockingAwait();
        emissions.getEvents().getSomethingSpecific()
        .subscribe(event -> System.out.println(event.getSomethingSpecific()) // Here is the event that I would like to bind or otherwise push to textAreaA in the FXML controller
        ,throwable -> new Exception("GUI error!"));

    }
}

    public class FXMLDocumentController implements Initializable {

    @FXML 
    public TextArea textAreaA;

    @Override
    public void initialize(URL arg0, ResourceBundle arg1) {
        // TODO Auto-generated method stub

    }


}

Answer 1

我的想法是让TESTER_API调用FXMLDocumentController中的一个函数来更新textAreaA。我建议使用Platform.runLater()来确保线程安全。

public class Tester extends Application{
[...]

public void start (Stage primaryStage) throws Exception {
    FXMLLoader loader = new FXMLLoader(getClass().getResource("sample.fxml"));
    Parent root = loader.load();

    FXMLDocumentController controller = loader.getController();

    primaryStage.setTitle("App Window");
    primaryStage.setScene(new Scene(root, 300, 275));
    primaryStage.show();


    TESTER_API.TESTER_API_Connector(controller);       
}

}

public class TESTER_API {

public static void TESTER_API_Connector(FXMLDocumentController controller) throws IOException, InterruptedException {
    [...]
    emissions.getEvents().getSomethingSpecific()
    .subscribe(event -> Platform.runLater(() -> {
        controller.updateTextArea(event.getSomethingSpecific());
    }),
    throwable -> new Exception("GUI error!"));

}

}

public class FXMLDocumentController implements Initializable {

    @FXML 
    public TextArea textAreaA;

    [...]
    public void updateTextArea(String string) {
        textAreaA.setText(string);
    }
}

如何使JavaFX显示API供稿

1 个答案: