为什么我会收到 java.lang.IllegalStateException “Not on FX application thread"?在 JavaFX 上? [英] Why am I getting java.lang.IllegalStateException "Not on FX application thread" on JavaFX?

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问题描述

我有一个应用程序,它有一个 TableView,它有一个附加的侦听器,因此它会在检测到更改时立即刷新,但问题是我正在获取 java.lang.IllegalStateException:不在 FX 应用程序线程上;currentThread = Smack 侦听器处理器 (0).这是我的代码:

I have an application that has a TableView that has an attached listener so it refreshes as soon as it detects a change, but the thing is that I´m getting java.lang.IllegalStateException: Not on FX application thread; currentThread = Smack Listener Processor (0). Here is my code:

/**
 * This function resets the pagination pagecount
 */
public void resetPage() {
    try {
        System.out.println("RESET"); 
        int tamRoster = this.loginManager.getRosterService().getRosterList().size();
        paginationContactos.setPageCount((int)(Math.ceil(tamRoster*1.0/limit.get())));
        int tamEnviados = this.loginManager.getRosterService().getEnviadasList().size();
        paginationEnviadas.setPageCount((int)(Math.ceil(tamEnviados*1.0/limit.get())));
        int tamRecibidas = this.loginManager.getRosterService().getRecibidasList().size();
        paginationRecibidas.setPageCount((int)(Math.ceil(tamRecibidas*1.0/limit.get())));
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public void doSomething () {
        this.loginManager.getRosterService().getRosterList().addListener(new ListChangeListener<RosterDTO>() {
            @Override
            public void onChanged(
                    javafx.collections.ListChangeListener.Change<? extends RosterDTO> c) {
                // TODO Auto-generated method stub
                resetPage();
                while (c.next()) {
                    if (c.wasPermutated()) {
                        System.out.println("PERM");
                    } else if (c.wasUpdated()) {
                        System.out.println("UPD");
                    } else {
                        System.out.println("ELSE");
                    }
                }
            }
         });
}

尽管它进入了 resetPage 方法,但我得到了那个异常.为什么会这样?我该如何解决?提前致谢.

Altough it enters the resetPage method, I get that exception. Why is this happening? How can I fix it? Thanks in advance.

推荐答案

不能从非应用程序线程直接更新用户界面.相反,使用 Platform.runLater() 和 Runnable 对象内部的逻辑.例如:

The user interface cannot be directly updated from a non-application thread. Instead, use Platform.runLater(), with the logic inside the Runnable object. For example:

Platform.runLater(new Runnable() {
    @Override
    public void run() {
        // Update UI here.
    }
});

作为 lambda 表达式:

As a lambda expression:

// Avoid throwing IllegalStateException by running from a non-JavaFX thread.
Platform.runLater(
  () -> {
    // Update UI here.
  }
);

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