在JavaFX中,Platform.runLater太慢了 [英] Platform.runLater too slow in JavaFX
问题描述
我正在尝试在我的JavaFx应用程序中执行一个线程,我还需要更新我的listview,这就是为什么我在其中使用了Platform.runLater。问题是它似乎太慢了,因为它会在其中跳转if状态。 listView.setItems(model.getEmailList());
部分执行没有问题,但忽略条件即使我打印两个值我想比较它们是不同的。我怎样才能改进它?因为我不能在平台外移动那个 if
,因为我试图在我的JavaFX应用程序的一个线程中显示它。
I'm trying to execute a thread inside my JavaFx application and I also need to update my listview, reason why I used a Platform.runLater inside it. The problem is that it seems to be too slow, since it jumps the if state inside it. The listView.setItems(model.getEmailList());
part is executed without problem, but ignore the the condition even if when I print the two value I wanna compare they are different. How can I improve it? Because I cannot move that if
outside the Platform since I'm trying to display it in a thread of my JavaFX application.
new Thread() {
@Override
public void run() {
while (true) {
try {
int currentOnServer = model.askNumbOfEmail();
if (emailForClient != currentOnServer) {
model.reLoadData();
Platform.runLater(() -> {
listView.setItems(model.getEmailList());
if (currentOnServer > emailForClient) {
new Alert(Alert.AlertType.INFORMATION, "Hai recevuto un email!").showAndWait();
}
});
emailForClient = currentOnServer;
}
} catch (IOException ex) {
Thread.currentThread().interrupt();
return;
} catch (ParseException ex) {
System.out.println("ParseException ERROR!");
}
}
}
}.start();
推荐答案
你的if语句不起作用,因为你是在单独的线程中更改条件的一部分:
Your if statement doesn't work because you're changing part of the condition in a separate thread:
emailForClient = currentOnServer
当您使用线程时,这是一个常见问题。您需要修改代码的逻辑以便于并行执行。您可以创建一个临时变量来存储 emailForClient
并在 Platform.runLater
中使用它:
This is a common problem when you're working with threads. You need to modify the logic of your code to facilitate parallel execution. You can create a temp variable to store emailForClient
and use it inside Platform.runLater
instead:
model.reLoadData();
final int currentEmail = emailForClient; // I'm assuming emailForClient is an int
Platform.runLater(() -> {
listView.setItems(model.getEmailList());
if (currentOnServer > currentEmail) {
new Alert(Alert.AlertType.INFORMATION, "Hai recevuto un email!").showAndWait();
}
});
emailForClient = currentOnServer;
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