我正在构建一个全新的 android 项目。这不是我的第一个 Android 应用程序,所以我更沮丧的是无法摆脱这个错误...
我使用的是 XML 文件,目前只有 3 个项目,XML 选项卡中没有错误:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".gaming..MainActivity" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/fondipad"
android:contentDescription="@string/FondDesc"
/>
<RelativeLayout
android:layout_height="300dp"
android:layout_width="fill_parent"
android:background="@drawable/cadremenu">
</RelativeLayout>
</RelativeLayout>
很简单,是吗? 但是,视觉选项卡没有呈现可绘制的 cadremenu(但“fond”确实如此)......但是 cadremenu.png 位于可绘制文件夹中! 我可以启动该应用程序,但只呈现背景... 真不知道怎么办……xml文件返回这个异常
java.lang.NullPointerException
at android.graphics.Bitmap_Delegate.createBitmap(Bitmap_Delegate.java:598)
at android.graphics.Bitmap_Delegate.createBitmap(Bitmap_Delegate.java:120)
at android.graphics.Bitmap_Delegate.createBitmap(Bitmap_Delegate.java:102)
at com.android.layoutlib.bridge.impl.ResourceHelper.getDrawable(ResourceHelper.java:233)
at android.content.res.BridgeTypedArray.getDrawable(BridgeTypedArray.java:782)
at android.view.View.<init>(View.java:3554)
at android.view.View.<init>(View.java:3484)
at android.view.ViewGroup.<init>(ViewGroup.java:464)
at android.widget.RelativeLayout.<init>(RelativeLayout.java:236)
at sun.reflect.GeneratedConstructorAccessor37.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:594)
at android.view.BridgeInflater.onCreateView(BridgeInflater.java:86)
at android.view.LayoutInflater.onCreateView(LayoutInflater.java:669)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:694)
at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:131)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:755)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:727)
at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
at android.view.LayoutInflater.inflate(LayoutInflater.java:373)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:399)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:336)
at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:332)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.RenderService.createRenderSession(RenderService.java:504)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.renderWithBridge(GraphicalEditorPart.java:1584)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.recomputeLayout(GraphicalEditorPart.java:1309)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.activated(GraphicalEditorPart.java:1066)
at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditorDelegate.delegatePageChange(LayoutEditorDelegate.java:686)
at com.android.ide.eclipse.adt.internal.editors.common.CommonXmlEditor.pageChange(CommonXmlEditor.java:360)
at org.eclipse.ui.part.MultiPageEditorPart$2.widgetSelected(MultiPageEditorPart.java:292)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4136)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1458)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1481)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1466)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1271)
at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3028)
at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1749)
at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:278)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4136)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1458)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1481)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1466)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1271)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3982)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3621)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1053)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:942)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:86)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:588)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:543)
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(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:629)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
at org.eclipse.equinox.launcher.Main.run(Main.java:1438)
欢迎任何帮助!
编辑:我已经尝试删除、放回可绘制对象、项目、....清理项目、重新构建...我什至尝试删除并重新安装每个 ADT 组件
最佳答案
正如@laato 所建议的,我检查了我的 drawable/cadremenu 文件。我复制/粘贴/覆盖了我项目中的文件,然后一切正常!实际上,我的所有其他资源都遇到了同样的问题,比如我的资源文件夹是否已损坏或类似问题。
谢谢大家 希望有一天有人能在这里找到帮助
关于java - Android XML 文件 java.lang.nullpointerexception,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/23277646/