在我看来，当窗口打开时我有一个选择监听器。 ( View 采用所选项目并根据该项目显示一些数据)。
当我关闭并重新打开 View 时发生异常。在另一个窗口中更改选择时更新 View 的功能有效，但在重新打开 View 后 View 不会更新。
我有一个带有 setText 方法的标签，该方法为我提供了这个小部件处理异常。
这是一个选择监听器问题吗？有必要在处理 View 时删除执行期间创建的所有监听器吗？
编辑:
选择监听代码:
final ISelectionListener selectionListener=(new ISelectionListener()
{
@Override
public void selectionChanged(IWorkbenchPart part, ISelection selection) {
// TODO Auto-generated method stub
IProject project = null ;
if(selection==null){
try {
throw new ProjectNotSelected("No selection in Window");
} catch (ProjectNotSelected e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
if(selection instanceof IStructuredSelection) {
Object element = ((IStructuredSelection)selection).getFirstElement();
if (element instanceof IResource) {
project= ((IResource)element).getProject();
}
else if (element instanceof IPackageFragmentRoot) {
IJavaProject jProject = ((IPackageFragmentRoot)element).getJavaProject();
project = jProject.getProject();
}
else if (element instanceof IJavaElement) {
IJavaProject jProject= ((IJavaElement)element).getJavaProject();
project = jProject.getProject();
}
else{
try {
throw new ProjectNotSelected("case 1");
} catch (ProjectNotSelected e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
else{
try {
throw new ProjectNotSelected("case 2");
} catch (ProjectNotSelected e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
if(project!=null)
{
String projectName=project.getName();
projectNameLabel.setText("Project: "+projectName);
}
}
});
添加选择监听器的函数:
public void newGetCurrentProject(final ISelectionListener selectionListener)
{
IWorkbench workbench = PlatformUI.getWorkbench();
final IWorkbenchWindow window =workbench.getActiveWorkbenchWindow() ;
final IPartService pS=window.getPartService();
pS.addPartListener(new IPartListener()
{
@Override
public void partActivated(IWorkbenchPart part) {
// TODO Auto-generated method stub window.getSelectionService().addSelectionListener("org.eclipse.jdt.ui.PackageExplorer",selectionListener);
}
@Override
public void partBroughtToTop(IWorkbenchPart part) {
// TODO Auto-generated method stub
}
@Override
public void partClosed(IWorkbenchPart part) {
// TODO Auto-generated method stub
window.getSelectionService().removeSelectionListener("org.eclipse.jdt.ui.PackageExplorer",selectionListener);
}
@Override
public void partDeactivated(IWorkbenchPart part) {
// TODO Auto-generated method stub
}
@Override
public void partOpened(IWorkbenchPart part) {
// TODO Auto-generated method stub
window.getSelectionService().addSelectionListener("org.eclipse.jdt.ui.PackageExplorer",selectionListener);
}
});
堆栈跟踪:
org.eclipse.swt.SWTException: Widget is disposed
at org.eclipse.swt.SWT.error(SWT.java:4361)
at org.eclipse.swt.SWT.error(SWT.java:4276)
at org.eclipse.swt.SWT.error(SWT.java:4247)
at org.eclipse.swt.widgets.Widget.error(Widget.java:468)
at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:340)
at org.eclipse.swt.widgets.Label.setText(Label.java:386)
at com.warnings.compilation.views.TabViewer$2.selectionChanged(TabViewer.java:260)
at org.eclipse.ui.internal.AbstractPartSelectionTracker$1.run(AbstractPartSelectionTracker.java:119)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.runtime.Platform.run(Platform.java:857)
at org.eclipse.ui.internal.AbstractPartSelectionTracker.fireSelection(AbstractPartSelectionTracker.java:117)
at org.eclipse.ui.internal.WindowPartSelectionTracker$1.selectionChanged(WindowPartSelectionTracker.java:38)
at org.eclipse.ui.internal.AbstractPartSelectionTracker$1.run(AbstractPartSelectionTracker.java:119)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.runtime.Platform.run(Platform.java:857)
at org.eclipse.ui.internal.AbstractPartSelectionTracker.fireSelection(AbstractPartSelectionTracker.java:117)
at org.eclipse.ui.internal.PagePartSelectionTracker$1.selectionChanged(PagePartSelectionTracker.java:49)
at org.eclipse.jface.viewers.Viewer$2.run(Viewer.java:164)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
at org.eclipse.jface.viewers.Viewer.fireSelectionChanged(Viewer.java:162)
at org.eclipse.jface.viewers.StructuredViewer.updateSelection(StructuredViewer.java:2188)
at org.eclipse.jface.viewers.StructuredViewer.handleSelect(StructuredViewer.java:1211)
at org.eclipse.jface.viewers.StructuredViewer$4.widgetSelected(StructuredViewer.java:1241)
at org.eclipse.jface.util.OpenStrategy.fireSelectionEvent(OpenStrategy.java:239)
at org.eclipse.jface.util.OpenStrategy.access$4(OpenStrategy.java:233)
at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:403)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4169)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3758)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:353)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:629)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
at org.eclipse.equinox.launcher.Main.run(Main.java:1438)
at org.eclipse.equinox.launcher.Main.main(Main.java:1414)
选择监听器放置在 createPartControl 中。
问题出现在这一行:
projectNameLabel.setText("Project: "+projectName);
最佳答案
当您在 View 部分添加一个选择监听器时，您必须在 View 关闭时移除该监听器。像这样的东西:
public classs MyView extends ViewPart
{
private ISelectionListener myListener;
@Override
public void createPartControl(final Composite parent)
{
myListener = .... create listener
ISelectionService selService = ... get selection serivce
selService.addSelectionListener(myListener);
}
@Override
public void dispose()
{
if (myListener != null)
{
ISelectionService selService = ... get selection serivce
selService.removeSelectionListener(myListener);
myListener = null;
}
super.dispose();
}
}
关于java - 如何解决小部件处置异常？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27289133/