app最小化再进进入app发生 java.lang.NullPointerException

最新推荐文章于 2021-06-01 02:24:07 发布
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本文讨论了拼车应用中，如何处理从其他界面通过Intent传递的时间数据，在app退到后台后再进入时出现时间为空的问题。提出了两种解决方案：缓存数据在本地或从服务器获取，特别强调了如果时间数据对项目业务逻辑至关重要，则建议从后台服务器获取。

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我们项目是关于拼车，在跟踪车主有个需求,就是离开车前15分钟告诉乘客，而车主发车时间是车主自己选择的，是从其他界面通过Intent传递过来，但是我们把app退到后台再进入是，这个时间就为空，这是导致 java.lang.NullPointerException的原因，因为它直接就进入到了跟踪界面，所以intent传递过来的time，就为"",碰到这样的问题一般有二种做法

1：缓存在本地

2:从服务器获取

一般如果time对项目很有用途，也就是和你业务逻辑紧密相连的话最好是从后台获取，在此记录下

Adapter中常见遇到的NullPointerException
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View.inflate（）：找出 res/layout 下的 xml 布局文件填充到父布局，并且实例化，此时，仅仅在内存中创建了这个对象而已，在界面上不会显示出来这个对象 findViewById（）：根据id获取布局文件中的布局和空间，只要使用android:id=”“属性的都可以使用此方法获取。默认是在主xml布局文件中查找，如果要动态加载的布局文件，则要在使用： 声明的布局名.findViewById(R.id.tv_grid)
NullPointerException原因及解决办法
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分析以下报错信息： E FATAL EXCEPTION: main Process: com.example.contacts2, PID: 11798 java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.contacts2/com.example.contacts2.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.pm.ApplicationInfo android.content.Context.getApplicationInfo()' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:4186) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4467) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:222) at android.app.servertransaction.TransactionExecutor.executeNonLifecycleItem(TransactionExecutor.java:133) at android.app.servertransaction.TransactionExecutor.executeTransactionItems(TransactionExecutor.java:103) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:80) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2823) at android.os.Handler.dispatchMessage(Handler.java:110) at android.os.Looper.loopOnce(Looper.java:248) at android.os.Looper.loop(Looper.java:338) at android.app.ActivityThread.main(ActivityThread.java:9067) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:593) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:932) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.pm.ApplicationInfo android.content.Context.getApplicationInfo()' on a null object reference at android.content.ContextWrapper.getApplicationInfo(ContextWrapper.java:208) at android.view.ContextThemeWrapper.getTheme(ContextThemeWrapper.java:174) at android.content.Context.obtainStyledAttributes(Context.java:1103) at androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor(AppCompatDelegateImpl.java:922) at androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor(AppCompatDelegateImpl.java:889) at androidx.appcompat.app.AppCompatDelegateImpl.findViewById(AppCompatDelegateImpl.java:691) at androidx.appcompat.app.AppCompatActivity.findViewById(AppCompatActivity.java:264) at com.example.contacts2.MainActivity.<init>(MainActivity.java:35) at java.lang.Class.newInstance(Native Method) at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:95) at androidx.core.app.CoreComponentFactory.instantiateActivity(CoreComponentFactory.java:45) at android.app.Instrumentation.newActivity(Instrumentation.java:1443) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:4173) ... 13 more
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java.lang.NullPointerException: null at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1683) at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1803) at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:924) at com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceWrapper.afterPropertiesSet(DruidDataSourceWrapper.java:51) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1863) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1800) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:620) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:336) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:334) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:209) at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:673) at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:661) at org.springframework.context.support.AbstractApplicationContext.getBeansOfType(AbstractApplicationContext.java:1317) at com.risen.base.dyna.conf.encrypt.EncoderFactory.init(EncoderFactory.java:246) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflec
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完整的最小化Druid配置示例： ```java @SpringBootApplication public class App { public static void main(String[] args) { SpringApplication.run(App.class, args); } } @Configuration @...
分析报错 行 113554: 07-23 15:06:33.078 3765 13230 W System.err :13230): java.lang.NullPointerException: Attempt to read from field 'int androidx.constraintlayout.core.SolverVariable.id' on a null object reference 行 113555: 07-23 15:06:33.078 3765 13230 W System.err :13230): at androidx.constraintlayout.core.ArrayLinkedVariables.get(ArrayLinkedVariables.java:596) 行 113556: 07-23 15:06:33.079 3765 13230 W System.err :13230): at androidx.constraintlayout.core.ArrayLinkedVariables.use(ArrayLinkedVariables.java:349) 行 113557: 07-23 15:06:33.079 3765 13230 W System.err :13230): at androidx.constraintlayout.core.ArrayRow.updateFromRow(ArrayRow.java:561) 行 113558: 07-23 15:06:33.079 3765 13230 W System.err :13230): at androidx.constraintlayout.core.ArrayRow.updateFromSystem(ArrayRow.java:734) 行 113560: 07-23 15:06:33.086 3765 13230 W System.err :13230): at androidx.constraintlayout.core.LinearSystem.addConstraint(LinearSystem.java:573) 行 113561: 07-23 15:06:33.086 3765 13230 W System.err :13230): at androidx.constraintlayout.core.LinearSystem.addEquality(LinearSystem.java:1367) 行 113562: 07-23 15:06:33.087 3765 13230 W System.err :13230): at androidx.constraintlayout.core.widgets.ConstraintWidget.applyConstraints(ConstraintWidget.java:3263) 行 113563: 07-23 15:06:33.087 3765 13230 W System.err :13230): at androidx.constraintlayout.core.widgets.ConstraintWidget.addToSolver(ConstraintWidget.java:2714) 行 113564: 07-23 15:06:33.087 3765 13230 W System.err :13230): at androidx.constraintlayout.core.widgets.ConstraintWidgetContainer.addChildrenToSolver(ConstraintWidgetContainer.java:435) 行 113565: 07-23 15:06:33.087 3765 13230 W System.err :13230): at androidx.constraintlayout.core.widgets.ConstraintWidgetContainer.layout(ConstraintWidgetContainer.java:835) 行 113566: 07-23 15:06:33.087 3765 13230 W System.err :13230): at androidx.constraintlayout.core.widgets.analyzer.BasicMeasure.solveLinearSystem(BasicMeasure.java:160) 行 113567: 07-23 15:06:33.088 3765 13230 W System.err :13230): at androidx.constraintlayout.core.widgets.analyzer.BasicMeasure.solverMeasure(BasicMeasure.java:291) 行 113568: 07-23 15:06:33.088 3765 13230 W System.err :13230): at androidx.constraintlayout.core.widgets.ConstraintWidgetContainer.measure(ConstraintWidgetContainer.java:120) 行 113569: 07-23 15:06:33.088 3765 13230 W System.err :13230): at androidx.constraintlayout.widget.ConstraintLayout.resolveSystem(ConstraintLayout.java:1594) 行 113570: 07-23 15:06:33.088 3765 13230 W System.err :13230): at androidx.constraintlayout.widget.ConstraintLayout.onMeasure(ConstraintLayout.java:1708) 行 113571: 07-23 15:06:33.088 3765 13230 W System.err :13230): at android.view.View.measure(View.java:25090) 行 113572: 07-23 15:06:33.088 3765 13230 W System.err :13230): at com.seres.app.map_resource.adapter.util.ViewToBitmap.layoutView(ViewToBitmap.java:29) 行 113573: 07-23 15:06:33.088 3765 13230 W System.err :13230): at com.seres.app.map_resource.adapter.base.BaseStyleAdapter.l(BaseStyleAdapter.java:315) 行 113574: 07-23 15:06:33.088 3765 13230 W System.err :13230): at com.seres.app.map_resource.adapter.base.BaseStyleAdapter.s(BaseStyleAdapter.java:248) 行 113575: 07-23 15:06:33.088 3765 13230 W System.err :13230): at com.seres.app.map_resource.adapter.base.BaseStyleAdapter.t(BaseStyleAdapter.java:337) 行 113576: 07-23 15:06:33.088 3765 13230 W System.err :13230): at com.seres.app.map_resource.adapter.route.RouteLayerStyleAdapter.onCompareTipStyle(RouteLayerStyleAdapter.java:389) 行 113577: 07-23 15:06:33.088 3765 13230 W System.err :13230): at com.seres.service.navi.map.layers.route.impl.RouteLayer.J1(RouteLayer.java:1456) 行 113578: 07-23 15:06:33.088 3765 13230 W System.err :13230): at com.seres.service.navi.map.layers.route.impl.RouteLayer.C0(Unknown Source:0) 行 113579: 07-23 15:06:33.089 3765 13230 W System.err :13230): at com.seres.service.navi.map.layers.route.impl.h.onWith(Unknown Source:6) 行 113580: 07-23 15:06:33.089 3765 13230 W System.err :13230): at com.seres.service.navi.util.check.TypeCheck.a(TypeCheck.java:46) 行 113581: 07-23 15:06:33.089 3765 13230 W System.err :13230): at com.seres.service.navi.map.layers.route.impl.RouteLayer.Y0(RouteLayer.java:1454) 行 113582: 07-23 15:06:33.089 3765 13230 W System.err :13230): at com.seres.service.navi.map.layers.route.impl.RouteLayer.y2(RouteLayer.java:1101) 行 113583: 07-23 15:06:33.089 3765 13230 W System.err :13230): at com.seres.service.navi.map.layers.route.impl.RouteLayer.E0(RouteLayer.java:134) 行 113584: 07-23 15:06:33.089 3765 13230 W System.err :13230): at com.seres.service.navi.map.layers.route.impl.RouteLayer$1.getLayerStyle(RouteLayer.java:1903) 行 113585: 07-23 15:06:33.089 3765 13230 W System.err :13230): at com.autonavi.gbl.map.router.PrepareLayerStyleRouter.getLayerStyle(PrepareLayerStyleRouter.java:246) 行 113586: 07-23 15:06:33.089 3765 13230 W System.err :13230): at com.autonavi.gbl.map.layer.observer.impl.MapLayerObserverJNI.SwigDirector_IPrepareLayerStyleImpl_getLayerStyle(MapLayerObserverJNI.java:68) 行 113587: 07-23 15:06:33.089 3765 13230 W System.err :13230): at com.autonavi.gbl.layer.impl.IBizControlImpl.updateStyle1Native(Native Method) 行 113588: 07-23 15:06:33.089 3765 13230 W System.err :13230): at com.autonavi.gbl.layer.impl.IBizControlImpl.updateStyle(IBizControlImpl.java:246) 行 113589: 07-23 15:06:33.089 3765 13230 W System.err :13230): at com.autonavi.gbl.layer.BizControl.updateStyle(BizControl.java:434) 行 113590: 07-23 15:06:33.089 3765 13230 W System.err :13230): at com.seres.service.navi.map.layers.route.impl.RouteLayer.o2(RouteLayer.java:898) 行 113591: 07-23 15:06:33.089 3765 13230 W System.err :13230): at com.seres.service.navi.map.layers.route.impl.RouteLayer.C(Unknown Source:0) 行 113592: 07-23 15:06:33.089 3765 13230 W System.err :13230): at com.seres.service.navi.map.layers.route.impl.b1.run(Unknown Source:4) 行 113593: 07-23 15:06:33.089 3765 13230 W System.err :13230): at android.os.Handler.handleCallback(Handler.java:883) 行 113594: 07-23 15:06:33.089 3765 13230 W System.err :13230): at android.os.Handler.dispatchMessage(Handler.java:100) 行 113595: 07-23 15:06:33.090 3765 13230 W System.err :13230): at android.os.Looper.loop(Looper.java:214) 行 113596: 07-23 15:06:33.090 3765 13230 W System.err :13230): at android.os.HandlerThread.run(HandlerThread.java:67) 行 113597: 07-23 15:06:33.090 3765 13230 I System.out :13230): EXCEPTION : java.lang.NullPointerException: Attempt to read from field 'int androidx.constraintlayout.core.SolverVariable.id' on a null object reference
07-25
首先，用户的问题是关于Android应用中的NullPointerException错误，具体是："java.lang.NullPointerException: Attempt to read from field 'int androidx.constraintlayout.core.SolverVariable.id' on a null ...
org.gradle.api.ProjectConfigurationException: A problem occurred configuring project ':library'. at org.gradle.configuration.project.LifecycleProjectEvaluator.addConfigurationFailure(LifecycleProjectEvaluator.java:94) at org.gradle.configuration.project.LifecycleProjectEvaluator.notifyAfterEvaluate(LifecycleProjectEvaluator.java:89) at org.gradle.configuration.project.LifecycleProjectEvaluator.doConfigure(LifecycleProjectEvaluator.java:70) at org.gradle.configuration.project.LifecycleProjectEvaluator.access$100(LifecycleProjectEvaluator.java:34) at org.gradle.configuration.project.LifecycleProjectEvaluator$ConfigureProject.run(LifecycleProjectEvaluator.java:110) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328) at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199) at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110) at org.gradle.configuration.project.LifecycleProjectEvaluator.evaluate(LifecycleProjectEvaluator.java:50) at org.gradle.api.internal.project.DefaultProject.evaluate(DefaultProject.java:666) at org.gradle.api.internal.project.DefaultProject.evaluate(DefaultProject.java:135) at org.gradle.execution.TaskPathProjectEvaluator.configure(TaskPathProjectEvaluator.java:35) at org.gradle.execution.TaskPathProjectEvaluator.configureHierarchy(TaskPathProjectEvaluator.java:62) at org.gradle.configuration.DefaultBuildConfigurer.configure(DefaultBuildConfigurer.java:38) at org.gradle.initialization.DefaultGradleLauncher$ConfigureBuild.run(DefaultGradleLauncher.java:249) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328) at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199) at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110) at org.gradle.initialization.DefaultGradleLauncher.configureBuild(DefaultGradleLauncher.java:167) at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:126) at org.gradle.initialization.DefaultGradleLauncher.getConfiguredBuild(DefaultGradleLauncher.java:104) at org.gradle.internal.invocation.GradleBuildController$2.call(GradleBuildController.java:87) at org.gradle.internal.invocation.GradleBuildController$2.call(GradleBuildController.java:84) at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:152) at org.gradle.internal.invocation.GradleBuildController.doBuild(GradleBuildController.java:100) at org.gradle.internal.invocation.GradleBuildController.configure(GradleBuildController.java:84) at org.gradle.tooling.internal.provider.runner.ClientProvidedBuildActionRunner.run(ClientProvidedBuildActionRunner.java:64) at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35) at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35) at org.gradle.tooling.internal.provider.ValidatingBuildActionRunner.run(ValidatingBuildActionRunner.java:32) at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner$1.run(RunAsBuildOperationBuildActionRunner.java:43) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328) at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199) at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110) at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner.run(RunAsBuildOperationBuildActionRunner.java:40) at org.gradle.tooling.internal.provider.SubscribableBuildActionRunner.run(SubscribableBuildActionRunner.java:51) at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:47) at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:30) at org.gradle.launcher.exec.BuildTreeScopeBuildActionExecuter.execute(BuildTreeScopeBuildActionExecuter.java:39) at org.gradle.launcher.exec.BuildTreeScopeBuildActionExecuter.execute(BuildTreeScopeBuildActionExecuter.java:25) at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:80) at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:53) at org.gradle.tooling.internal.provider.ServicesSetupBuildActionExecuter.execute(ServicesSetupBuildActionExecuter.java:57) at org.gradle.tooling.internal.provider.ServicesSetupBuildActionExecuter.execute(ServicesSetupBuildActionExecuter.java:32) at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:36) at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:25) at org.gradle.tooling.internal.provider.ParallelismConfigurationBuildActionExecuter.execute(ParallelismConfigurationBuildActionExecuter.java:43) at org.gradle.tooling.internal.provider.ParallelismConfigurationBuildActionExecuter.execute(ParallelismConfigurationBuildActionExecuter.java:29) at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:69) at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:30) at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:59) at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:44) at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execute(SetupLoggingActionExecuter.java:45) at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execute(SetupLoggingActionExecuter.java:30) at org.gradle.launcher.daemon.server.exec.ExecuteBuild.doBuild(ExecuteBuild.java:67) at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122) at org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute(WatchForDisconnection.java:37) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122) at org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute(ResetDeprecationLogger.java:26) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122) at org.gradle.launcher.daemon.server.exec.RequestStopIfSingleUsedDaemon.execute(RequestStopIfSingleUsedDaemon.java:34) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122) at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:74) at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:72) at org.gradle.util.Swapper.swap(Swapper.java:38) at org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute(ForwardClientInput.java:72) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122) at org.gradle.launcher.daemon.server.exec.LogAndCheckHealth.execute(LogAndCheckHealth.java:55) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122) at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClient.java:62) at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122) at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBuild(EstablishBuildEnvironment.java:82) at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36) at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122) at org.gradle.launcher.daemon.server.exec.StartBuildOrRespondWithBusy$1.run(StartBuildOrRespondWithBusy.java:50) at org.gradle.launcher.daemon.server.DaemonStateCoordinator$1.run(DaemonStateCoordinator.java:295) at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63) at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46) at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55) Caused by: java.lang.NullPointerException
07-24
针对 `org.gradle.api.ProjectConfigurationException: A problem occurred configuring project ':library'` 错误，以下是系统化的解决方案： --- #### 1. **验证 NDK 安装状态** ```bash # 检查 NDK 是否安装 ...
android启动程序报java.lang.NullPointerException的原因
jinus的专栏
08-03 1752
这种属于adt做的有bug，新建程序的时候，偶尔出现没有设定好目标版本的情况。虽然你在新建程序向导里面选好了android版本。 解决方法就是项目名右键-》Properties（弹出设定窗口）-》Run/Debug Settings（左边列表）-》选中项目名（右边内容），点edit按钮，弹出窗口-》选target选项卡-》这时就会看到AVD Name的列表，出现上述问题时，一般都是没有选中任何列
Android开发中遇到Java.lang.NullPointerException解决办法
Miracle.Zhao的博客
01-15 9231
我们在开发软件的时候，不知道你是否遇到过Java.Lang.NullPointerException的错误，出现这和错误呢，不是大的错误，但是找不到的话，分分钟钟让你崩溃，所谓空指针的错误，就是你定义了一个对象，也就是有了一个指针，但是你没有给它赋值，然后嫩，你就直接引用了，那么这个时候就会报出空指针的错误。今天写程序的时候，遇到了一次空指针的错误，也是寻找好久，最终才发现空指针的出处。下面是我遇
android app开机启动崩溃,由于java.lang.NullPointerException，Android App在启动时崩溃
weixin_42213784的博客
06-01 287
package com.shoppinglist;import java.util.ArrayList;import android.app.Dialog;import android.app.ListActivity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener...
Android常见问题之： NullPointerException
a1160712069的专栏
04-08 577
问题：java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference 1.定位到相关的文件方法 2.检查是否是xml布局文件的问题 3.如果是xml布局文件的问题： a...
android错误-nullpointException的原因
qq_31071805的博客
06-27 930
谈到nullpointException，这可能是android学习新手遇到的比较多的问题了，下面就来分析一些这类错误的常见的原因： 原因一：可能你漏了***=findViewById(R.id.**);,只是在.java中声明了变量并直接设置监听事件，但是并未和.xml中的相应的组件建立联系，所以在回去检查一下。 本文章会持续更新，敬请期待。
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