activity_main.xml: java.lang.NullPointerException

最新推荐文章于 2024-03-19 19:42:19 发布
转载 最新推荐文章于 2024-03-19 19:42:19 发布 · 78 阅读 · 0
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#java #开发工具 #移动开发

本文深入探讨了在Android布局中遇到的NullPointerException错误的具体原因，并提供了详细的解决方案，帮助开发者理解并解决这一常见问题。

1、错误描写叙述

eclipse.buildId=4.4.0.I20140606-1215
java.version=1.7.0_67
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=zh_CN
Framework arguments:  -product org.eclipse.epp.package.jee.product
Command-line arguments:  -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.jee.product

com.android.ide.eclipse.adt
Error
Fri Jun 05 23:50:22 CST 2015
activity_main.xml: java.lang.NullPointerException

java.lang.NullPointerException
	at android.support.v7.internal.widget.ActionBarOverlayLayout.getDecorToolbar(ActionBarOverlayLayout.java:599)
	at android.support.v7.internal.widget.ActionBarOverlayLayout.pullChildren(ActionBarOverlayLayout.java:588)
	at android.support.v7.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:359)
	at android.view.View.measure(View.java:17547)
	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
	at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
	at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
	at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
	at android.view.View.measure(View.java:17547)
	at android.widget.LinearLayout.measureVertical(LinearLayout.java:875)
	at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
	at android.view.View.measure(View.java:17547)
	at com.android.layoutlib.bridge.impl.RenderSessionImpl.measureView(RenderSessionImpl.java:640)
	at com.android.layoutlib.bridge.impl.RenderSessionImpl.render(RenderSessionImpl.java:540)
	at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:323)
	at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:349)
	at com.android.ide.eclipse.adt.internal.editors.layout.gle2.RenderService.createRenderSession(RenderService.java:519)
	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.setActivePage(MultiPageEditorPart.java:1101)
	at org.eclipse.ui.forms.editor.FormEditor.setActivePage(FormEditor.java:607)
	at com.android.ide.eclipse.adt.internal.editors.AndroidXmlEditor.selectDefaultPage(AndroidXmlEditor.java:450)
	at com.android.ide.eclipse.adt.internal.editors.AndroidXmlEditor.addPages(AndroidXmlEditor.java:311)
	at com.android.ide.eclipse.adt.internal.editors.common.CommonXmlEditor.addPages(CommonXmlEditor.java:285)
	at org.eclipse.ui.forms.editor.FormEditor.createPages(FormEditor.java:138)
	at org.eclipse.ui.part.MultiPageEditorPart.createPartControl(MultiPageEditorPart.java:362)
	at org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.createPartControl(CompatibilityPart.java:140)
	at org.eclipse.ui.internal.e4.compatibility.CompatibilityEditor.createPartControl(CompatibilityEditor.java:99)
	at org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.create(CompatibilityPart.java:321)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:55)
	at org.eclipse.e4.core.internal.di.InjectorImpl.processAnnotated(InjectorImpl.java:888)
	at org.eclipse.e4.core.internal.di.InjectorImpl.processAnnotated(InjectorImpl.java:869)
	at org.eclipse.e4.core.internal.di.InjectorImpl.inject(InjectorImpl.java:120)
	at org.eclipse.e4.core.internal.di.InjectorImpl.internalMake(InjectorImpl.java:337)
	at org.eclipse.e4.core.internal.di.InjectorImpl.make(InjectorImpl.java:258)
	at org.eclipse.e4.core.contexts.ContextInjectionFactory.make(ContextInjectionFactory.java:162)
	at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.createFromBundle(ReflectionContributionFactory.java:104)
	at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.doCreate(ReflectionContributionFactory.java:73)
	at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.create(ReflectionContributionFactory.java:55)
	at org.eclipse.e4.ui.workbench.renderers.swt.ContributedPartRenderer.createWidget(ContributedPartRenderer.java:127)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createWidget(PartRenderingEngine.java:983)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:662)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:766)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$2(PartRenderingEngine.java:737)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$7.run(PartRenderingEngine.java:731)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:715)
	at org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer.showTab(StackRenderer.java:1251)
	at org.eclipse.e4.ui.workbench.renderers.swt.LazyStackRenderer$1.handleEvent(LazyStackRenderer.java:66)
	at org.eclipse.e4.ui.services.internal.events.UIEventHandler$1.run(UIEventHandler.java:40)
	at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:187)
	at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:156)
	at org.eclipse.swt.widgets.Display.syncExec(Display.java:4734)
	at org.eclipse.e4.ui.internal.workbench.swt.E4Application$1.syncExec(E4Application.java:218)
	at org.eclipse.e4.ui.services.internal.events.UIEventHandler.handleEvent(UIEventHandler.java:36)
	at org.eclipse.equinox.internal.event.EventHandlerWrapper.handleEvent(EventHandlerWrapper.java:197)
	at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:197)
	at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:1)
	at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
	at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
	at org.eclipse.equinox.internal.event.EventAdminImpl.dispatchEvent(EventAdminImpl.java:135)
	at org.eclipse.equinox.internal.event.EventAdminImpl.sendEvent(EventAdminImpl.java:78)
	at org.eclipse.equinox.internal.event.EventComponent.sendEvent(EventComponent.java:39)
	at org.eclipse.e4.ui.services.internal.events.EventBroker.send(EventBroker.java:81)
	at org.eclipse.e4.ui.internal.workbench.UIEventPublisher.notifyChanged(UIEventPublisher.java:59)
	at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:374)
	at org.eclipse.e4.ui.model.application.ui.impl.ElementContainerImpl.setSelectedElement(ElementContainerImpl.java:171)
	at org.eclipse.e4.ui.internal.workbench.ModelServiceImpl.showElementInWindow(ModelServiceImpl.java:488)
	at org.eclipse.e4.ui.internal.workbench.ModelServiceImpl.bringToTop(ModelServiceImpl.java:454)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.delegateBringToTop(PartServiceImpl.java:692)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.bringToTop(PartServiceImpl.java:385)
	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.showPart(PartServiceImpl.java:1126)
	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:3182)
	at org.eclipse.ui.internal.WorkbenchPage.access$23(WorkbenchPage.java:3104)
	at org.eclipse.ui.internal.WorkbenchPage$9.run(WorkbenchPage.java:3086)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:3081)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:3045)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:3035)
	at org.eclipse.ui.ide.IDE.openEditor(IDE.java:541)
	at org.eclipse.ui.ide.IDE.openEditor(IDE.java:500)
	at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:360)
	at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:167)
	at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:268)
	at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:233)
	at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:275)
	at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:251)
	at org.eclipse.jdt.internal.ui.packageview.PackageExplorerActionGroup.handleOpen(PackageExplorerActionGroup.java:376)
	at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$4.open(PackageExplorerPart.java:538)
	at org.eclipse.ui.OpenAndLinkWithEditorHelper$InternalListener.open(OpenAndLinkWithEditorHelper.java:48)
	at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:853)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:50)
	at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:178)
	at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:850)
	at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1142)
	at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1249)
	at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:278)
	at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:272)
	at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:313)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4353)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1061)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4172)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3761)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1151)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1032)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:148)
	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:636)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:579)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:135)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:382)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:236)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:648)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:603)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1465)

2、错误原因 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.helloworld.MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />
    
    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</RelativeLayout>


3、解决的方法

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05-08 10:36:21.419 10317 31197 31197 E AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{id.dana/id.dana.home_v2.main.MainHomeActivity}: java.lang.NullPointerException
05-10
好的，用户现在遇到了Android应用启动时的空指针异常问题，具体错误是java.lang.NullPointerException导致无法启动Activity。我需要根据提供的引用和之前的经验，给出解决方案。首先，分析可能的原因，再逐步排查。 ...
FATAL EXCEPTION: main Process: com.tplink.vigi, PID: 3108 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.tplink.vigi/com.tplink.ipc.ui.deviceSetting.recordPlan.SettingRecordPlanSelectActivity}: android.view.InflateException: Binary XML file line #52 in com.tplink.vigi:layout/activity_setting_record_plan_select: Binary XML file line #52 in com.tplink.vigi:layout/activity_setting_record_plan_select: Error inflating class com.tplink.ipc.common.commonView.TPSecurTwoLineItemView at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3809) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3971) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2373) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loopOnce(Looper.java:233) at android.os.Looper.loop(Looper.java:344) at android.app.ActivityThread.main(ActivityThread.java:8200) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:589) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1071) Caused by: android.view.InflateException: Binary XML file line #52 in com.tplink.vigi:layout/activity_setting_record_plan_select: Binary XML file line #52 in com.tplink.vigi:layout/activity_setting_record_plan_select: Error inflating class com.tplink.ipc.common.commonView.TPSecurTwoLineItemView Caused by: android.view.InflateException: Binary XML file line #52 in com.tplink.vigi:layout/activity_setting_record_plan_select: Error inflating class com.tplink.ipc.common.commonView.TPSecurTwoLineItemView Caused by: java.lang.reflect.InvocationTargetException at java.lang.reflect.Constructor.newInstance0(Native Method) at java.lang.reflect.Constructor.newInstance(Constructor.java:343) at android.view.LayoutInflater.createView(LayoutInflater.java:858) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:1014) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:965) at android.view.LayoutInflater.rInflate(LayoutInflater.java:1144) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1105) at android.view.LayoutInflater.rInflate(LayoutInflater.java:1147) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1105) at android.view.LayoutInflater.inflate(LayoutInflater.java:686) at android.view.LayoutInflater.inflate(LayoutInflater.java:538) at android.view.LayoutInflater.inflate(LayoutInflater.java:485) at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:775) at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:197) at androidx.databinding.DataBindingUtil.setContentView(DataBindingUtil.java:303) at androidx.databinding.DataBindingUtil.setContentView(DataBindingUtil.java:284) at com.tplink.ipc.ui.deviceSetting.recordPlan.SettingRecordPlanSelectActivity.initView(SettingRecordPlanSelectActivity.kt:134) at com.tplink.ipc.ui.deviceSetting.recordPlan.SettingRecordPlanSelectActivity.onCreate(SettingRecordPlanSelectActivity.kt:89) at android.app.Activity.performCreate(Activity.java:8130) at android.app.Activity.performCreate(Activity.java:8110) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1343) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3778) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3971) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 2025-07-31 13:50:40.650 3108-3108 AndroidRuntime com.tplink.vigi E at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2373) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loopOnce(Looper.java:233) at android.os.Looper.loop(Looper.java:344) at android.app.ActivityThread.main(ActivityThread.java:8200) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:589) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1071) Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.Object kotlin.Lazy.getValue()' on a null object reference at com.tplink.design.list.TPTwoLineItemView.getItemViewHelper(TPListItemView.kt:618) at com.tplink.design.list.TPListItemView.setOnClickListener(TPListItemView.kt:376) at android.view.View.<init>(View.java:5840) at android.view.ViewGroup.<init>(ViewGroup.java:707) at androidx.constraintlayout.widget.ConstraintLayout.<init>(ConstraintLayout.java:598) at com.tplink.design.list.TPListItemView.<init>(TPListItemView.kt:54) at com.tplink.design.list.TPTwoLineItemView.<init>(TPListItemView.kt:614) at com.tplink.design.list.TPTwoLineItemView.<init>(TPListItemView.kt:609) at com.tplink.ipc.common.commonView.TPSecurTwoLineItemView.<init>(TPSecurTwoLineItemView.kt:13) ... 34 more
08-01
2. **布局文件中使用了错误的类名**：检查XML布局文件中自定义视图的类名是否完全正确，包括包名。 3. **混淆问题**：如果启用了混淆，自定义视图的类可能被混淆，导致运行时找不到类。参考引用[5]中提到了混淆问题...
分析报错信息： FATAL EXCEPTION: main Process: com.example.myapplication, PID: 7164 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myapplication/com.example.myapplication.PhoneActivity}: java.lang.RuntimeException: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ArrayAdapter.notifyDataSetChanged()' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3449) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loop(Looper.java:223) at android.app.ActivityThread.main(ActivityThread.java:7656) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947) Caused by: java.lang.RuntimeException: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ArrayAdapter.notifyDataSetChanged()' on a null object reference at com.example.myapplication.PhoneActivity.readContacts(PhoneActivity.java:53) at com.example.myapplication.PhoneActivity.onCreate(PhoneActivity.java:33) at android.app.Activity.performCreate(Activity.java:7994) at android.app.Activity.performCreate(Activity.java:7978) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3422) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601)  at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)  at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)  at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)  at android.os.Handler.dispatchMessage(Handler.java:106)  at android.os.Looper.loop(Looper.java:223)  at android.app.ActivityThread.main(ActivityThread.java:7656)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)  Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ArrayAdapter.notifyDataSetChanged()' on a null object reference at com.example.myapplication.PhoneActivity.readContacts(PhoneActivity.java:50) at com.example.myapplication.PhoneActivity.onCreate(PhoneActivity.java:33)  at android.app.Activity.performCreate(Activity.java:7994)  at android.app.Activity.performCreate(Activity.java:7978)  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3422)  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601)  at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)  at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)  at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)  at android.os.Handler.dispatchMessage(Handler.java:106)  at android.os.Looper.loop(Looper.java:223)  at android.app.ActivityThread.main(ActivityThread.java:7656)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)  2025-07-10 10:40:05.447 7164-7180 System com.example.myapplication W A resource failed to call close.
07-11
我们正在解决一个特定的空指针异常问题：`java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ArrayAdapter.notifyDataSetChanged()' on a null object reference` ...
2025-08-07 19:24:42.674 2849-2849 AndroidRuntime com.silan.robotpeisongcontrl E FATAL EXCEPTION: main Process: com.silan.robotpeisongcontrl, PID: 2849 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.silan.robotpeisongcontrl/com.silan.robotpeisongcontrl.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2671) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2732) at android.app.ActivityThread.-wrap12(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1483) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6141) at java.lang.reflect.Method.invoke(Native Method)
最新发布
08-08
根据引用[2]：错误信息是`java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference`，这明确指出了...
android studio 启动后activity_main.xml的design下报错rendering problems can't resolve resource……
无敌大将军
11-21 2577
解决办法： Invalidate your caches and restart. File -> Invalidate Caches / Restart... -> Invalidate and Restart
android activity_main.xml,Android Studio 打开activity_main.xml不能正常显示
weixin_30638387的博客
05-26 4527
操作系统：Windows 10 x64IDE：Android Studio 3.2.1解决方法：http://www.jcodecraeer.com/a/anzhuokaifa/Android_Studio/2017/0317/7691.html参考了第3种方法，问题得以解决。在Android Studio中新建一个项目之后，打开activity_main.xml，不能正常显示。暂时没搞懂根本原因...
关于Android Studio初始化activity_main.xml文件打不开的问题
sinat_41843710的博客
02-20 8821
关于Android Studio初始化activity_main.xml文件无法显示的问题。 点开activity_main.xml文件 显示Design editor is unavailable until a successful build.或者一直停在Waiting for build to finish. 网上很多方法都无效的时候建议完全卸载后重装。 彻底卸载包括 1.控制面板卸载An...
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