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在此三元语句中抛出NullPointerException的原因是什么？（java三元表达式null判断）

4

本文将分享在此三元语句中抛出NullPointerException的原因是什么？的详细内容，并且还将对java三元表达式null判断进行详尽解释，此外，我们还将为大家带来关于Androidgradl

本文将分享在此三元语句中抛出NullPointerException的原因是什么？的详细内容，并且还将对java三元表达式null判断进行详尽解释，此外，我们还将为大家带来关于Android gradle插件更新到3.3.0抛出NullPointerException、android – ContentResolver查询抛出nullpointerException、android – 导致这个NullpointerException的原因是什么？、android – 隐藏片段中的actionbar会抛出NullPointerException吗？的相关知识，希望对你有所帮助。

本文目录一览：

在此三元语句中抛出NullPointerException的原因是什么？（java三元表达式null判断）

在此三元语句中抛出NullPointerException的原因是什么？（java三元表达式null判断）

如何解决在此三元语句中抛出NullPointerException的原因是什么？？

以下代码在return语句中引发NullPointerException。

private Integer[] intLeftToRight;

private boolean isConditionSatisfied(int keyIndex,Integer rangeNumber) {
    return rangeNumber == null ? true : (intLeftToRight[keyIndex] >= rangeNumber);
}

由于难以调试该特定程序，因此我试图确定所有的原因可能是在该行上引发此类异常吗？到目前为止，我已经提出了以下建议。还有其他人吗？

  1. intLeftToRight为空
  2. intLeftToRight[keyIndex]为空

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

小编邮箱:dio#foxmail.com (将#修改为@）

Android gradle插件更新到3.3.0抛出NullPointerException

Android gradle插件更新到3.3.0抛出NullPointerException

我刚刚更新到Android Studio 3.3并尝试将Gradle插件更新为3.3.0但项目构建失败.

该项目是一个带有应用程序(使用该库)的库.尝试了一切：清除,重建,重置,删除.gradle目录,甚至没有运气重启计算机.任何的想法？

这是堆栈跟踪

org.gradle.api.ProjectConfigurationException: A problem occurred configuring project ':screenz_library'.
    |95 internal calls|
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
    at java.lang.Thread.run(Thread.java:745)
Caused by: com.android.build.gradle.internal.crash.ExternalApiUsageException: java.lang.NullPointerException
    at com.android.build.gradle.internal.ApiObjectFactory.create(ApiObjectFactory.java:137)
    at com.android.build.gradle.BasePlugin.createAndroidTasks(BasePlugin.java:777)
    at com.android.builder.profile.ThreadRecorder.record(ThreadRecorder.java:81)
    at com.android.build.gradle.BasePlugin.lambda$createTasks$4(BasePlugin.java:651)
    at com.android.build.gradle.internal.crash.CrashReporting$afterEvaluate$1.execute(crash_reporting.kt:37)
    at com.android.build.gradle.internal.crash.CrashReporting$afterEvaluate$1.execute(crash_reporting.kt)
    at org.gradle.configuration.internal.DefaultListenerBuildOperationDecorator$BuildOperationEmittingAction$1$1.run(DefaultListenerBuildOperationDecorator.java:155)
    at org.gradle.configuration.internal.DefaultUserCodeApplicationContext.reapply(DefaultUserCodeApplicationContext.java:58)
    at org.gradle.configuration.internal.DefaultListenerBuildOperationDecorator$BuildOperationEmittingAction$1.run(DefaultListenerBuildOperationDecorator.java:152)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:300)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:292)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:174)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:90)
    at org.gradle.configuration.internal.DefaultListenerBuildOperationDecorator$BuildOperationEmittingAction.execute(DefaultListenerBuildOperationDecorator.java:149)
    at org.gradle.internal.event.broadcastdispatch$ActionInvocationHandler.dispatch(broadcastdispatch.java:91)
    at org.gradle.internal.event.broadcastdispatch$ActionInvocationHandler.dispatch(broadcastdispatch.java:80)
    at org.gradle.internal.event.Abstractbroadcastdispatch.dispatch(Abstractbroadcastdispatch.java:42)
    at org.gradle.internal.event.broadcastdispatch$Singletondispatch.dispatch(broadcastdispatch.java:230)
    at org.gradle.internal.event.broadcastdispatch$Singletondispatch.dispatch(broadcastdispatch.java:149)
    at org.gradle.internal.event.Abstractbroadcastdispatch.dispatch(Abstractbroadcastdispatch.java:58)
    at org.gradle.internal.event.broadcastdispatch$Compositedispatch.dispatch(broadcastdispatch.java:324)
    at org.gradle.internal.event.broadcastdispatch$Compositedispatch.dispatch(broadcastdispatch.java:234)
    at org.gradle.internal.event.Listenerbroadcast.dispatch(Listenerbroadcast.java:140)
    at org.gradle.internal.event.Listenerbroadcast.dispatch(Listenerbroadcast.java:37)
    at org.gradle.internal.dispatch.ProxydispatchAdapter$dispatchingInvocationHandler.invoke(ProxydispatchAdapter.java:93)
    at com.sun.proxy.$Proxy29.afterEvaluate(UnkNown Source)
    at org.gradle.configuration.project.LifecycleProjectEvaluator$NotifyAfterEvaluate$1.execute(LifecycleProjectEvaluator.java:187)
    at org.gradle.configuration.project.LifecycleProjectEvaluator$NotifyAfterEvaluate$1.execute(LifecycleProjectEvaluator.java:184)
    at org.gradle.api.internal.project.DefaultProject.stepEvaluationListener(DefaultProject.java:1418)
    at org.gradle.configuration.project.LifecycleProjectEvaluator$NotifyAfterEvaluate.run(LifecycleProjectEvaluator.java:193)
    ... 95 more
Caused by: java.lang.NullPointerException
    at org.gradle.api.internal.tasks.DefaultTaskDependency.add(DefaultTaskDependency.java:185)
    at org.gradle.api.internal.AbstractTask$12.run(AbstractTask.java:430)
    at org.gradle.api.internal.tasks.TaskMutator.mutate(TaskMutator.java:40)
    at org.gradle.api.internal.AbstractTask.dependsOn(AbstractTask.java:428)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite$PogoCachedMethodSite.invoke(PogoMetaMethodSite.java:169)
    at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite.call(PogoMetaMethodSite.java:71)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:128)
    at com.google.gms.googleservices.GoogleServicesPlugin.handleVariant(GoogleServicesPlugin.groovy:206)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:98)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
    at org.gradle.internal.Metaobject.BeanDynamicObject$MetaClassAdapter.invokeMethod(BeanDynamicObject.java:479)
    at org.gradle.internal.Metaobject.BeanDynamicObject.tryInvokeMethod(BeanDynamicObject.java:191)
    at org.gradle.internal.Metaobject.ConfigureDelegate.invokeMethod(ConfigureDelegate.java:78)
    at org.codehaus.groovy.runtime.Metaclass.ClosureMetaClass.invokeOnDelegationObjects(ClosureMetaClass.java:398)
    at org.codehaus.groovy.runtime.Metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:338)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1034)
    at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:68)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:177)
    at com.google.gms.googleservices.GoogleServicesPlugin$_setupPlugin_closure6.doCall(GoogleServicesPlugin.groovy:148)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:98)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
    at org.codehaus.groovy.runtime.Metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:264)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1034)
    at groovy.lang.Closure.call(Closure.java:418)
    at groovy.lang.Closure.call(Closure.java:434)
    at org.gradle.api.internal.ClosureBackedAction.execute(ClosureBackedAction.java:71)
    at org.gradle.util.ConfigureUtil.configureTarget(ConfigureUtil.java:155)
    at org.gradle.util.ConfigureUtil.configure(ConfigureUtil.java:106)
    at org.gradle.util.ConfigureUtil$WrappedConfigureAction.execute(ConfigureUtil.java:167)
    at org.gradle.internal.ImmutableActionSet$SingletonSet.execute(ImmutableActionSet.java:225)
    at org.gradle.api.internal.DefaultDomainObjectCollection.doAdd(DefaultDomainObjectCollection.java:244)
    at org.gradle.api.internal.DefaultDomainObjectCollection.add(DefaultDomainObjectCollection.java:233)
    at com.android.build.gradle.LibraryExtension.addVariant(LibraryExtension.java:93)
    at com.android.build.gradle.internal.ApiObjectFactory.create(ApiObjectFactory.java:134)
    ... 124 more

解决方法:

我在尝试其他事情的同时找到了解决方案.
出于某种原因,我在我的图书馆的gradle文件中有了Google Services插件,所以我删除了它并且项目构建没有问题.

我删除了这一行

apply plugin: 'com.google.gms.google-services'

android – ContentResolver查询抛出nullpointerException

android – ContentResolver查询抛出nullpointerException

我正在写一个基于 Android 2.3.3 htc令人难以置信的S的感应2.1的MMS / SMS应用程序.
现在,在尝试接收SMS / MMS的某个联系人列表时,我在查询中获得了FC.

这是一些代码：

Uri uri = Uri.parse("content://mms-sms/conversations/"+String.valueOf(thread_id));
ContentResolver cr = context.getContentResolver();
Cursor c= cr.query(uri,null,null);    //crashing here

logcat的：

05-22 15:24:24.273: E/AndroidRuntime(32087): FATAL EXCEPTION: main
05-22 15:24:24.273: E/AndroidRuntime(32087): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.uiu.messaging/com.uiu.messaging.ContactMessageChain}: java.lang.NullPointerException
05-22 15:24:24.273: E/AndroidRuntime(32087): at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:1816)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1837)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at android.app.ActivityThread.access$1500(ActivityThread.java:132)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1033)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at android.os.Handler.dispatchMessage(Handler.java:99)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at android.os.Looper.loop(Looper.java:143)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at android.app.ActivityThread.main(ActivityThread.java:4196)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at java.lang.reflect.Method.invokeNative(Native Method)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at java.lang.reflect.Method.invoke(Method.java:507)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at dalvik.system.NativeStart.main(Native Method)
05-22 15:24:24.273: E/AndroidRuntime(32087): Caused by: java.lang.NullPointerException
05-22 15:24:24.273: E/AndroidRuntime(32087):    at android.os.Parcel.readException(Parcel.java:1328)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:160)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:114)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at android.content.ContentProviderProxy.bulkQueryInternal(ContentProviderNative.java:372)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at android.content.ContentProviderProxy.query(ContentProviderNative.java:408)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at android.content.ContentResolver.query(ContentResolver.java:264)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at com.uiu.messaging.Data.getContactChain(Data.java:319)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at com.uiu.messaging.ContactMessageChain.onCreate(ContactMessageChain.java:138)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
05-22 15:24:24.273: E/AndroidRuntime(32087):    at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:1780)
05-22 15:24:24.273: E/AndroidRuntime(32087):    ... 11 more

所有权限都被考虑在内.

任何帮助将不胜感激.

编辑：

遵循Mike的建议后,我在logcat中收到以下错误：

05-22 16:31:46.178: E/AndroidRuntime(1892): FATAL EXCEPTION: main
05-22 16:31:46.178: E/AndroidRuntime(1892): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.uiu.messaging/com.uiu.messaging.ContactMessageChain}: android.database.sqlite.sqliteException: near "*": Syntax error:,while compiling: SELECT * FROM (SELECT disTINCT date * 1 AS normalized_date,NULL AS * FROM sms WHERE (htc_category= 0 AND thread_id = 25 AND (type != 3 AND type > 0)) UNION SELECT disTINCT date * 1000 AS normalized_date,NULL AS * FROM pdu LEFT JOIN pending_msgs ON pdu._id = pending_msgs.msg_id WHERE (htc_category= 0 AND thread_id = 25 AND msg_Box != 3 AND (msg_Box > 0 AND msg_Box != 3 AND (m_type = 128 OR m_type = 132 OR m_type = 130))) ORDER BY normalized_date ASC)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:1816)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1837)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at android.app.ActivityThread.access$1500(ActivityThread.java:132)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1033)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at android.os.Looper.loop(Looper.java:143)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at android.app.ActivityThread.main(ActivityThread.java:4196)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at java.lang.reflect.Method.invokeNative(Native Method)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at java.lang.reflect.Method.invoke(Method.java:507)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at dalvik.system.NativeStart.main(Native Method)
05-22 16:31:46.178: E/AndroidRuntime(1892): Caused by: android.database.sqlite.sqliteException: near "*": Syntax error:,NULL AS * FROM pdu LEFT JOIN pending_msgs ON pdu._id = pending_msgs.msg_id WHERE (htc_category= 0 AND thread_id = 25 AND msg_Box != 3 AND (msg_Box > 0 AND msg_Box != 3 AND (m_type = 128 OR m_type = 132 OR m_type = 130))) ORDER BY normalized_date ASC)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:158)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:114)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at android.content.ContentProviderProxy.bulkQueryInternal(ContentProviderNative.java:372)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at android.content.ContentProviderProxy.query(ContentProviderNative.java:408)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at android.content.ContentResolver.query(ContentResolver.java:264)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at com.uiu.messaging.Data.getContactChain(Data.java:318)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at com.uiu.messaging.ContactMessageChain.onCreate(ContactMessageChain.java:138)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
05-22 16:31:46.178: E/AndroidRuntime(1892):     at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:1780)
05-22 16:31:46.178: E/AndroidRuntime(1892):     ... 11 more

我不知道sql语句有什么问题……

解决方法

好的,修好了.诀窍是在投影中输入实际的列名.好像这个bug毕竟是android的.

android – 导致这个NullpointerException的原因是什么？

android – 导致这个NullpointerException的原因是什么？

我收到了一份包含以下日志内容的崩溃报告： 

java.lang.NullPointerException
at android.webkit.PluginFullScreenHolder.show(PluginFullScreenHolder.java:85)
at android.webkit.WebView$PrivateHandler.handleMessage(WebView.java:8553)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4340)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)

我尝试在网上搜索PluginFullScreenHolder,但第85行似乎是我发现的类中的注释.

我猜测崩溃与WebView有关 – 可能是因为我正在尝试加载null,但我对此非常不确定,特别是因为我没有看到URL为null的方法.

我认为该报告来自galaxy Nexus(在Android 4.0上),如果这有任何区别,但我不确定.如果没有,那就是Honeycomb设备.

有PluginFullScreenHolder经验的人吗？

这是我的代码

web = (WebView) findViewById(R.id.webView1);
web.setBackgroundColor(android.R.color.black);
web.getSettings().setJavaScriptEnabled(true);
web.getSettings().setPluginsEnabled(true);
web.getSettings().setUserAgent(1);
web.getSettings().setSupportZoom(false);
web.loadUrl("http://www.justin.tv/widgets/live_embed_player.swf?auto_play=true&fullscreen=true&start_volume=100&hostname=www.justin.tv&channel=" + this.getIntent().getExtras().getString("channelName"));

奇怪的是,市场的崩溃报告没有提到任何关于我的代码的事情 – 没有什么事情 – 你正在查看上面的完整日志.毫无疑问,它是PluginFullScreenHolder.java.

编辑2：

找到了正确的课程：http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/4.0.1_r1/android/webkit/PluginFullScreenHolder.java#PluginFullScreenHolder.show%28%29

有问题的一行是：

client.onShowCustomView(mLayout,mOrientation,mCallback);

解决方法

这是PluginFullScreenHolder.java source code for android 4.0.

在第84行,您有mWebView.getWebChromeClient(),它根据您的异常返回null(它在第85行使用,没有空检查).

解决方法是设置一个空的WebChromeClient(当可能影响浏览器UI的事件发生时调用,例如,在此处发送进度更新和JavaScript警报)：

web.setWebChromeClient(new WebChromeClient());

但这真的很奇怪,因为它永远不应该是空的.

android – 隐藏片段中的actionbar会抛出NullPointerException吗？

android – 隐藏片段中的actionbar会抛出NullPointerException吗？

我正在尝试隐藏片段中的动作栏.要做到这一点,我正在尝试使用getActivity().getActionBar().hide();,但确实会抛出异常NullPointerException.我确实尝试过使用getSupportActionBar()但是Eclipse没有显示自动完成它只显示getActionBar();

我该怎么做 ？

分段

public class MyFragment extends Fragment {
@Override
        public void onCreate(Bundle savedInstanceState) {           
            super.onCreate(savedInstanceState); 
            getActivity().getActionBar().hide();  //nullpointerexception in this line       
        }  
}

例外：

12-05 12:19:02.415: E/AndroidRuntime(16400): FATAL EXCEPTION: main
12-05 12:19:02.415: E/AndroidRuntime(16400): java.lang.NullPointerException
12-05 12:19:02.415: E/AndroidRuntime(16400):    at br.com.mypackage.myapp.frags.BatalhaSemOponenteFrag.onCreate(BatalhaSemOponenteFrag.java:71)
12-05 12:19:02.415: E/AndroidRuntime(16400):    at android.support.v4.app.Fragment.performCreate(Fragment.java:1763)
12-05 12:19:02.415: E/AndroidRuntime(16400):    at android.support.v4.app.FragmentManagerImpl.movetoState(FragmentManager.java:913)
12-05 12:19:02.415: E/AndroidRuntime(16400):    at android.support.v4.app.FragmentManagerImpl.movetoState(FragmentManager.java:1126)
12-05 12:19:02.415: E/AndroidRuntime(16400):    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739)
12-05 12:19:02.415: E/AndroidRuntime(16400):    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489)
12-05 12:19:02.415: E/AndroidRuntime(16400):    at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:454)
12-05 12:19:02.415: E/AndroidRuntime(16400):    at android.os.Handler.handleCallback(Handler.java:730)
12-05 12:19:02.415: E/AndroidRuntime(16400):    at android.os.Handler.dispatchMessage(Handler.java:92)
12-05 12:19:02.415: E/AndroidRuntime(16400):    at android.os.Looper.loop(Looper.java:176)
12-05 12:19:02.415: E/AndroidRuntime(16400):    at android.app.ActivityThread.main(ActivityThread.java:5419)
12-05 12:19:02.415: E/AndroidRuntime(16400):    at java.lang.reflect.Method.invokeNative(Native Method)
12-05 12:19:02.415: E/AndroidRuntime(16400):    at java.lang.reflect.Method.invoke(Method.java:525)
12-05 12:19:02.415: E/AndroidRuntime(16400):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
12-05 12:19:02.415: E/AndroidRuntime(16400):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
12-05 12:19:02.415: E/AndroidRuntime(16400):    at dalvik.system.NativeStart.main(Native Method)

解决方法:

由于您使用的是v4支持片段,我假设您将使用appcompat进行活动.
您必须将从getActivity()获得的活动转换为实际活动,以便将活动识别为appcompat.

试试这个：

public class MyFragment extends Fragment {
@Override
    public void onCreate(Bundle savedInstanceState) {           
        super.onCreate(savedInstanceState); 
((YourActivity)getActivity()).getSupportActionBar().hide();
    }  
}

今天关于在此三元语句中抛出NullPointerException的原因是什么？和java三元表达式null判断的介绍到此结束，谢谢您的阅读，有关Android gradle插件更新到3.3.0抛出NullPointerException、android – ContentResolver查询抛出nullpointerException、android – 导致这个NullpointerException的原因是什么？、android – 隐藏片段中的actionbar会抛出NullPointerException吗？等更多相关知识的信息可以在本站进行查询。

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