解决SWT异常: org.eclipse.swt.SWTException: Invalid thread access问题 - 飞扬部落编程仓库-专注编程,网站,专业技术

在创建SWT界面的线程之外的线程中尝试去修改界面元素.将抛出以下异常

Exception in thread "Thread-0" org.eclipse.swt.SWTException: Invalid thread access

at org.eclipse.swt.SWT.error(SWT.java:2942)

at org.eclipse.swt.SWT.error(SWT.java:2865)

at org.eclipse.swt.SWT.error(SWT.java:2836)

上述Thread-0是另外开启的一个线程.

【解析】:

在SWT程序中,

SWT会自动创建一个用户界面线程

非用户界面线程不能直接操作用户界面线程

要想在另外一个线程中尝试修改用户界面,应采用一下方法:

if (!this.display.isDisposed()) {

      Runnable runnable = new Runnable() {

            public void run() {

                  // 你改界面的代码

            }

            };

      display.syncExec(runnable); // 关键在这一句上

}

swt-doc中的说明:

public void syncExec(java.lang.Runnable runnable)

Causes the run() method of the runnable to be invoked by the user-interface thread at the next reasonable opportunity. The thread which calls this method is suspended until the runnable completes.

Parameters:: runnable - code to run on the user-interface thread.

此外,与之对应的另一个方法:

public void asyncExec(java.lang.Runnable runnable)

Causes the run() method of the runnable to be invoked by the user-interface thread at the next reasonable opportunity. The caller of this method continues to run in parallel, and is not notified when the runnable has completed.

Parameters:: runnable - code to run on the user-interface thread.

Tags: SWT-Designer-研究学习

原创文章如转载，请注明：转载自：飞扬部落编程仓库 : http://www.busfly.net/csdn/

本文链接地址：http://www.busfly.net/csdn/post/eclipse-swt-SWTException-Invalid-thread-access.html

如果你喜欢本文，请顶一下，支持我，你的支持是我继续发好文章的最大动力。谢谢。
好东西需要分享，快把本文发给你的朋友吧~!~