what is the bug in this android layout xml chunk

Question

Hi, When I try to debug my app I get a runtimeexception when I include this xml in my layout. I cannot see what is wrong with it, can you? I am using android eclipse plugin, eclipse 3.5.2, with the latest android plugin and the latest java 6...21 on winxppro 32 bit sp3 Thank you.

<ImageButton android:id="@+id/map_button"
  android:src="@drawable/bot_map"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_weight="1"
  />

<ImageButton android:id="@+id/filter_button"
  android:src="@drawable/bot_filter"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_weight="1"
  />

<ImageButton android:id="@+id/sort_button"
  android:src="@drawable/bot_sort"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_weight="1"
  />

<ImageButton android:id="@+id/prev_button"
  android:src="@drawable/bot_arrow_prev"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_weight="1"
  />


<ImageButton android:id="@+id/next_button"
  android:src="@drawable/bot_arrow_next"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_weight="1"
  />

I also get these exceptions at the same time:

java.lang.IllegalArgumentException: Argument cannot be null at org.eclipse.swt.SWT.error(SWT.java:3865) at org.eclipse.swt.SWT.error(SWT.java:3799) at org.eclipse.swt.SWT.error(SWT.java:3770) at org.eclipse.swt.widgets.TreeItem.checkNull(TreeItem.java:205) at org.eclipse.swt.widgets.TreeItem.(TreeItem.java:195) at org.eclipse.gef.editparts.AbstractTreeEditPart.addChildVisual(AbstractTreeEditPart.java:75) at org.eclipse.gef.editparts.AbstractEditPart.addChild(AbstractEditPart.java:210) at org.eclipse.gef.editparts.AbstractEditPart.refreshChildren(AbstractEditPart.java:771) at org.eclipse.gef.editparts.AbstractEditPart.refresh(AbstractEditPart.java:718) at org.eclipse.gef.editparts.AbstractEditPart.addNotify(AbstractEditPart.java:252) at org.eclipse.gef.editparts.AbstractEditPart.addChild(AbstractEditPart.java:211) at org.eclipse.gef.editparts.RootTreeEditPart.setContents(RootTreeEditPart.java:140) at org.eclipse.gef.ui.parts.AbstractEditPartViewer.setContents(AbstractEditPartViewer.java:617) at org.eclipse.gef.ui.parts.AbstractEditPartViewer.setContents(AbstractEditPartViewer.java:626) at com.android.ide.eclipse.adt.internal.editors.layout.gle1.UiContentOutlinePage.reloadModel(Unknown Source) at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditor.xmlModelChanged(Unknown Source) at com.android.ide.eclipse.adt.internal.editors.AndroidXmlEditor$XmlModelStateListener.modelChanged(Unknown Source) at org.eclipse.wst.sse.core.internal.model.AbstractStructuredModel.fireModelChanged(AbstractStructuredModel.java:553) at org.eclipse.wst.sse.core.internal.model.AbstractStructuredModel.internalModelChanged(AbstractStructuredModel.java:887) at org.eclipse.wst.sse.core.internal.model.AbstractStructuredModel.changedModel(AbstractStructuredModel.java:382) at org.eclipse.wst.xml.core.internal.document.DOMModelImpl.changedModel(DOMModelImpl.java:167) at org.eclipse.wst.sse.core.internal.undo.StructuredTextUndoManager.undo(StructuredTextUndoManager.java:648) at org.eclipse.wst.sse.ui.StructuredTextViewerUndoManager.undo(StructuredTextViewerUndoManager.java:183) at org.eclipse.jface.text.TextViewer.doOperation(TextViewer.java:3938) at org.eclipse.jface.text.source.SourceViewer.doOperation(SourceViewer.java:921) at org.eclipse.jface.text.source.projection.ProjectionViewer.doOperation(ProjectionViewer.java:1533) at org.eclipse.wst.sse.ui.internal.StructuredTextViewer.doOperation(StructuredTextViewer.java:604) at org.eclipse.ui.texteditor.TextOperationAction$1.run(TextOperationAction.java:131) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.ui.texteditor.TextOperationAction.run(TextOperationAction.java:129) at org.eclipse.jface.action.Action.runWithEvent(Action.java:498) at org.eclipse.ui.commands.ActionHandler.execute(ActionHandler.java:185) at org.eclipse.ui.internal.handlers.LegacyHandlerWrapper.execute(LegacyHandlerWrapper.java:109) at org.eclipse.core.commands.Command.executeWithChecks(Command.java:476) at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508) at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:169) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.executeCommand(WorkbenchKeyboard.java:470) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.press(WorkbenchKeyboard.java:824) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.processKeyEvent(WorkbenchKeyboard.java:880) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.filterKeySequenceBindings(WorkbenchKeyboard.java:569) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.access$3(WorkbenchKeyboard.java:510) at org.eclipse.ui.internal.keys.WorkbenchKeyboard$KeyDownFilter.handleEvent(WorkbenchKeyboard.java:125) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Display.filterEvent(Display.java:1208) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1002) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1027) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1012) at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1040) at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1036) at org.eclipse.swt.widgets.Widget.wmChar(Widget.java:1368) at org.eclipse.swt.widgets.Control.WM_CHAR(Control.java:4053) at org.eclipse.swt.widgets.Canvas.WM_CHAR(Canvas.java:346) at org.eclipse.swt.widgets.Control.windowProc(Control.java:3946) at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:342) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4619) at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method) at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2411) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3501) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194) 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:368) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) 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:559) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514) at org.eclipse.equinox.launcher.Main.run(Main.java:1311)

Answer 1

You putting this in a relative layout, linearlayout, or what? What are you enclosing these buttons in? If it's just like that it probably doesn't know how to arrange what you've presented. I'm probably wrong here, I'd yield to another responder.

Answer 2

You can't have multiple root level nodes in XML