Galerie Démo NullPointerException

Question

http://developer.android.com/guide/tutorials/views/hello-gallery.html

je suivais le guide exactement, je peux compiler et exécuter le programme, mais il se bloque sur la charge.

Lorsque j'essaie d'afficher main.xml dans j'obtiens des erreurs dans la console.

java.lang.NullPointerException 
at android.view.GestureDetector.<init>(GestureDetector.java:347) 
at android.view.GestureDetector.<init>(GestureDetector.java:331) 
at android.widget.Gallery.<init>(Gallery.java:181) 
at android.widget.Gallery.<init>(Gallery.java:175) 
at sun.reflect.GeneratedConstructorAccessor38.newInstance(Unknown Source) 
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) 
at java.lang.reflect.Constructor.newInstance(Unknown Source) 
at android.view.LayoutInflater.createView(LayoutInflater.java:500) 
at android.view.BridgeInflater.onCreateView(BridgeInflater.java:77) 
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:563) 
at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:122) 
at android.view.LayoutInflater.rInflate(LayoutInflater.java:618) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:407) 
at android.view.LayoutInflater.inflate(LayoutInflater.java:296) 
at com.android.layoutlib.bridge.Bridge.computeLayout(Bridge.java:397) 
at com.android.ide.eclipse.adt.internal.editors.layout.gle1.GraphicalLayoutEditor.computeLayout(Unknown Source) 
at com.android.ide.eclipse.adt.internal.editors.layout.gle1.GraphicalLayoutEditor.recomputeLayout(Unknown Source) 
at com.android.ide.eclipse.adt.internal.editors.layout.gle1.GraphicalLayoutEditor.onXmlModelChanged(Unknown Source) 
at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditor.xmlModelChanged(Unknown Source) 
at com.android.ide.eclipse.adt.internal.editors.AndroidEditor$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.ui.StructuredTextEditor.savedModel(StructuredTextEditor.java:2814) 
at org.eclipse.wst.sse.ui.StructuredTextEditor.doSave(StructuredTextEditor.java:1826) 
at com.android.ide.eclipse.adt.internal.editors.AndroidEditor.doSave(Unknown Source) 
at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditor.doSave(Unknown Source) 
at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditor.showEditorInput(Unknown Source) 
at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2847) 
at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2768) 
at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2760) 
at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2711) 
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) 
at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2707) 
at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2691) 
at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2682) 
at org.eclipse.ui.ide.IDE.openEditor(IDE.java:651) 
at org.eclipse.ui.ide.IDE.openEditor(IDE.java:610) 
at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:365) 
at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:168) 
at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:229) 
at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:208) 
at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:274) 
at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:250) 
at org.eclipse.jdt.internal.ui.packageview.PackageExplorerActionGroup.handleOpen(PackageExplorerActionGroup.java:373) 
at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$4.open(PackageExplorerPart.java:526) 
at org.eclipse.ui.OpenAndLinkWithEditorHelper$InternalListener.open(OpenAndLinkWithEditorHelper.java:48) 
at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:845) 
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.StructuredViewer.fireOpen(StructuredViewer.java:843) 
at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1131) 
at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1235) 
at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:264) 
at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:258) 
at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:298) 
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:4066) 
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3657) 
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2629) 
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2593) 
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2427) 
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:670) 
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) 
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:663) 
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) 
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115) 
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:369) 
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:619) 
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574) 
at org.eclipse.equinox.launcher.Main.run(Main.java:1407) 
at org.eclipse.equinox.launcher.Main.main(Main.java:1383) 

EDIT: En fait, si je fais un nouveau projet et juste ajouter une galerie, je reçois toujours le NullPointerException. Je ne pense pas que cela devrait être le comportement par défaut.

Answer 1

avez-vous correctement nommé vos images dans le répertoire drawable? Le code source utilise R.drawable.sample_1 (et ainsi de suite). Vos images doivent donc s'appeler sample_1.png (et ainsi de suite). extension de fichier peut aussi être jpg, gif ... en fonction du format d'image que vous utilisez

Answer 2

oui, j'ai des images a, b, c, d, e dans mon res/dossier drawable-LDPI. Ensuite, je le code comme ceci: R.drawable.a etc - user157603 il y a 35 minutes

pas selon l'exemple, vous devez avoir les images appelées

**** sample_1.png , sample_2.png, sample_3.png, sample_4.png, sample_5.png, sample_6.png, sample_7.png ** (ou .jpg) dans votre dossier res/drawable.

ou vous vous obtiendrez un NullPointerException