我正在使用Eclipse Inigo和Android R20（他们的最新更新）。其他人都有“无法解析这样一个这样的xml文件”的问题似乎已经消失了，但仍然适合我。一次又一次。 xml文件之间没有区别。我收到这个错误。
java.lang.NullPointerException
at android.graphics.Bitmap_Delegate.nativeWidth(Bitmap_Delegate.java:291)
at android.graphics.Bitmap.nativeWidth(Bitmap.java)
at android.graphics.Bitmap.getWidth(Bitmap.java:742)
at android.graphics.Bitmap.getScaledWidth(Bitmap.java:790)
at android.graphics.drawable.BitmapDrawable.computeBitmapSize(BitmapDrawable.java:179)
at android.graphics.drawable.BitmapDrawable.setBitmap(BitmapDrawable.java:187)
at android.graphics.drawable.BitmapDrawable.<init>(BitmapDrawable.java:555)
at android.graphics.drawable.BitmapDrawable.<init>(BitmapDrawable.java:110)
at com.android.layoutlib.bridge.impl.ResourceHelper.getDrawable(ResourceHelper.java:239)
at android.content.res.BridgeResources.getDrawable(BridgeResources.java:162)
at android.graphics.drawable.StateListDrawable.inflate(StateListDrawable.java:173)
at android.graphics.drawable.Drawable.createFromXmlInner(Drawable.java:867)
at android.graphics.drawable.Drawable.createFromXml(Drawable.java:804)
at com.android.layoutlib.bridge.impl.ResourceHelper.getDrawable(ResourceHelper.java:208)
at android.content.res.BridgeTypedArray.getDrawable(BridgeTypedArray.java:774)
at android.widget.ImageView.<init>(ImageView.java:119)
at android.widget.ImageButton.<init>(ImageButton.java:85)
at android.widget.ImageButton.<init>(ImageButton.java:81)
at sun.reflect.GeneratedConstructorAccessor50.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at android.view.LayoutInflater.createView(LayoutInflater.java:586)
at android.view.BridgeInflater.onCreateView(BridgeInflater.java:86)
at android.view.LayoutInflater.onCreateView(LayoutInflater.java:653)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:678)
at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:131)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:739)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:711)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:742)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:711)
at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
at android.view.LayoutInflater.inflate(LayoutInflater.java:372)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:321)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:324)
at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:325)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.RenderService.createRenderSession(RenderService.java:372)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.renderWithBridge(GraphicalEditorPart.java:1640)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.recomputeLayout(GraphicalEditorPart.java:1391)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart$ReloadListener.reloadLayoutSwt(GraphicalEditorPart.java:1868)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart$ReloadListener.access$0(GraphicalEditorPart.java:1806)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart$ReloadListener$1.run(GraphicalEditorPart.java:1800)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3938)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3615)
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:123)
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:344)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
使用此xml文件。
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="@drawable/addpressed"/>
<item android:drawable="@drawable/addnormal"/>
</selector>
我做错了吗？