System.err: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method

最新推荐文章于 2025-06-30 15:19:40 发布
最新推荐文章于 2025-06-30 15:19:40 发布
阅读量4.4k 收藏 1
点赞数 2
CC 4.0 BY-SA版权
分类专栏： 个人问题随笔
版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
本文链接：https://blog.youkuaiyun.com/qq_36636969/article/details/86700915
博主在开发中因复制粘贴代码未检查布局，导致Activity跳转时出现空指针异常，提醒开发者在代码复用时务必谨慎检查。

摘要生成于 C知道 ，由 DeepSeek-R1 满血版支持， 前往体验 >

神经大条了，搞了个空指针

原因：有五个界面，要跳个activity，写完第一个就复制粘贴了，最后导致xml文件里面没有添加布局，粗心了

 

以此警醒自己：谨慎！！谨慎！！再谨慎！！

java.lang.NullPointerException: Attempt to invoke interface method 'java.sql.Statement java.sql.Conn
Tobey_r1的博客
08-06 1万+
问题描述 出现这个问题是我在连接数据使用语句查询的时候报的错误，当时反反复复检查线程里的数据库查询代码，一时没有发现问题。报的错误就是标题所述。 具体代码，当时也是立马到了85行代码这里（当然从代码的错误说明上也感觉是conn是空，后面有测试了一下，发现果然是这样。） package com.example.mysqlconnectiontest; import android.annotat...
Android异常处理javax.net.ssl.SSLProtocolException: SSL handshake aborted: ssl=0x41ea4068: Failure in SSL
Blue_Tong的博客
10-22 2522
Android异常处理： Caused by: javax.net.ssl.SSLProtocolException: SSL handshake aborted: ssl=0x41ea4068: Failure in SSL library, usually a protocol error log如下： 10-19 17:40:47.610 805-826/com.example.ipawsplay W/System.err: error:14077410:SSL routines:SSL23_
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.Action...
weixin_34248849的博客
11-14 1372
/********************************************************************************* * Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setDis...
java.lang.NullPointerException: Attempt to invoke virtual method.....
热门推荐
weixin_52263647的博客
08-22 5万+
java.lang.NullPointerException: Attempt to invoke virtual method...这是很多人常出现的异常报错，这篇文章将详细讲解各种情况以及如何找出出错的位置方便我们快速解决
java.lang.NullPointerException: Attempt to invoke virtual method ‘getSharedPreferences‘ on a null
weixin_40388758的博客
06-30 207
你现在是一个主应用（），但是：原先的被大量依赖；而 ScanApplication.onCreate()不再执行了；所以，所有用它的地方都会 NPE；所以你看到：textCopyEdit。
Android程序报错：java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.
可乐淘的专栏
06-07 1万+
当程序报错：java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getImportantForAccessibility()' on a null object reference 如图： 其实不管是LIstView还是GridView都会可能出现这种报错，原因都
java.lang.NullPointerException: Attempt to invoke virtual method
yuerliang的专栏
09-18 7691
java.lang.NullPointerException: Attempt to invoke virtual method
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.
冯冬冬的博客
07-22 2万+
今天在加载RecyclerView时发现运行崩溃，错误如下 E/AndroidRuntime: FATAL EXCEPTION: main                   Process: com.bespeak.activity, PID: 12197                   android.view.InflateException: Binary XML file line...
at java.lang.Daemons$Daemon.run(Daemons.java:139) at java.lang.Thread.run(Thread.java:923) 2024-11-06 09:22:16.532 13918-13918 System.err com.zkwg.yayizy W java.lang.RuntimeException: Unable to resume activity {com.zkwg.yayizy/com.zkwg.yayizy.ui.CameraActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.hardware.Camera$Parameters android.hardware.Camera.getParameters()' on a null object reference 2024-11-06 09:22:16.532 13918-13918 System.err com.zkwg.yayizy W at android.app.ActivityThread.performResumeActivity(ActivityThread.java:4438) 2024-11-06 09:22:16.532 13918-13918 System.err com.zkwg.yayizy W at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:4470) 2024-11-06 09:22:16.532 13918-13918 System.err com.zkwg.yayizy W at android.app.servertransaction.ResumeActivityItem.execute(ResumeActivityItem.java:52) 2024-11-06 09:22:16.533 13918-13918 System.err com.zkwg.yayizy W at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:176) 2024-11-06 09:22:16.533 13918-13918 System.err com.zkwg.yayizy W at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97) 2024-11-06 09:22:16.533 13918-13918 System.err com.zkwg.yayizy W at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066) 2024-11-06 09:22:16.533 13918-13918 System.err com.zkwg.yayizy W at android.os.Handler.dispatchMessage(Handler.java:106) 2024-11-06 09:22:16.533 13918-13918 System.err com.zkwg.yayizy W at android.os.Looper.loop(Looper.java:223) 2024-11-06 09:22:16.533 13918-13918 System.err com.zkwg.yayizy W at android.app.ActivityThread.main(ActivityThread.java:7660) 2024-11-06 09:22:16.533 13918-13918 System.err com.zkwg.yayizy W at java.lang.reflect.Method.invoke(Native Method) 2024-11-06 09:22:16.533 13918-13918 System.err com.zkwg.yayizy W at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) 2024-11-06 09:22:16.533 13918-13918 System.err com.zkwg.yayizy W at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947) 2024-11-06 09:22:16.533 13918-13918 System.err com.zkwg.yayizy W Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.hardware.Camera$Parameters android.hardware.Camera.getParameters()' on a null object reference 2024-11-06 09:22:16.533 13918-13918 System.err com.zkwg.yayizy W at com.zkwg.yayizy.ui.CameraActivity.setupCamera(CameraActivity.java:350) 2024-11-06 09:22:16.533 13918-13918 System.err com.zkwg.yayizy W at com.zkwg.yayizy.ui.CameraActivity.startPreview(CameraActivity.java:316) 2024-11-06 09:22:16.533 13918-13918 System.err com.zkwg.yayizy W at com.zkwg.yayizy.ui.CameraActivity.onResume(CameraActivity.java:149) 2024-11-06 09:22:16.533 13918-13918 System.err com.zkwg.yayizy W at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1456) 2024-11-06 09:22:16.533 13918-13918 System.err com.zkwg.yayizy W at android.app.Activity.performResume(Activity.java:8163) 2024-11-06 09:22:16.533 13918-13918 System.err com.zkwg.yayizy W at android.app.ActivityThread.performResumeActivity(ActivityThread.java:4428) 2024-11-06 09:22:16.533 13918-13918 System.err com.zkwg.yayizy W ... 11 more 2024-11-06 09:22:16.533 13918-13918 UncaughtEx...ionHandler com.zkwg.yayizy E java.lang.RuntimeException: Unable to resume activity {com.zkwg.yayizy/com.zkwg.yayizy.ui.CameraActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.hardware.Camera$Parameters android.hardware.Camera.getParameters()' on a null object reference 2024-11-06 09:22:16.533 13918-13918 Process com.zkwg.yayizy I Sending signal. PID: 13918 SIG: 9
07-03
Attempt to invoke virtual method 'android.hardware.Camera$Parameters android.hardware.Camera.getParameters()' on a null object reference ``` 根本原因：**`Camera` 对象未初始化或已被释放**，导致调用 `...
2024-11-06 09:15:19.739 9158-9158 System.err com.zkwg.yayizy W java.lang.RuntimeException: Unable to resume activity {com.zkwg.yayizy/com.zkwg.yayizy.ui.CameraActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.hardware.Camera$Parameters android.hardware.Camera.getParameters()' on a null object reference 2024-11-06 09:15:19.739 9158-9158 System.err com.zkwg.yayizy W at android.app.ActivityThread.performResumeActivity(ActivityThread.java:4438) 2024-11-06 09:15:19.739 9158-9158 System.err com.zkwg.yayizy W at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:4470) 2024-11-06 09:15:19.739 9158-9158 System.err com.zkwg.yayizy W at android.app.servertransaction.ResumeActivityItem.execute(ResumeActivityItem.java:52) 2024-11-06 09:15:19.740 9158-9158 System.err com.zkwg.yayizy W at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:176) 2024-11-06 09:15:19.740 9158-9158 System.err com.zkwg.yayizy W at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97) 2024-11-06 09:15:19.740 9158-9158 System.err com.zkwg.yayizy W at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066) 2024-11-06 09:15:19.740 9158-9158 System.err com.zkwg.yayizy W at android.os.Handler.dispatchMessage(Handler.java:106) 2024-11-06 09:15:19.740 9158-9158 System.err com.zkwg.yayizy W at android.os.Looper.loop(Looper.java:223) 2024-11-06 09:15:19.740 9158-9158 System.err com.zkwg.yayizy W at android.app.ActivityThread.main(ActivityThread.java:7660) 2024-11-06 09:15:19.740 9158-9158 System.err com.zkwg.yayizy W at java.lang.reflect.Method.invoke(Native Method) 2024-11-06 09:15:19.740 9158-9158 System.err com.zkwg.yayizy W at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) 2024-11-06 09:15:19.740 9158-9158 System.err com.zkwg.yayizy W at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947) 2024-11-06 09:15:19.740 9158-9158 System.err com.zkwg.yayizy W Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.hardware.Camera$Parameters android.hardware.Camera.getParameters()' on a null object reference 2024-11-06 09:15:19.740 9158-9158 System.err com.zkwg.yayizy W at com.zkwg.yayizy.ui.CameraActivity.setupCamera(CameraActivity.java:350) 2024-11-06 09:15:19.740 9158-9158 System.err com.zkwg.yayizy W at com.zkwg.yayizy.ui.CameraActivity.startPreview(CameraActivity.java:316) 2024-11-06 09:15:19.740 9158-9158 System.err com.zkwg.yayizy W at com.zkwg.yayizy.ui.CameraActivity.onResume(CameraActivity.java:149) 2024-11-06 09:15:19.740 9158-9158 System.err com.zkwg.yayizy W at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1456) 2024-11-06 09:15:19.740 9158-9158 System.err com.zkwg.yayizy W at android.app.Activity.performResume(Activity.java:8163) 2024-11-06 09:15:19.740 9158-9158 System.err com.zkwg.yayizy W at android.app.ActivityThread.performResumeActivity(ActivityThread.java:4428)
07-03
我们正在处理一个在`... ```Causedby:java.lang.NullPointerException: Attemptto invokevirtual method'android.hardware.Camera$Parameters android.hardware.Camera.getParameters()' ona nullobject referenceat ...
2025-07-14 19:12:21.243 15048-15048 nativeloader com.example.baiyunmap D Configuring clns-9 for other apk /data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/base.apk. target_sdk_version=35, uses_libraries=, library_path=/data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/lib/x86_64:/data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/base.apk!/lib/x86_64, permitted_path=/data:/mnt/expand:/data/user/0/com.example.baiyunmap 2025-07-14 19:12:21.246 15048-15048 CompatChangeReporter com.example.baiyunmap D Compat change id reported: 202956589; UID 10220; state: ENABLED 2025-07-14 19:12:21.251 15048-15048 ample.baiyunmap com.example.baiyunmap I AssetManager2(0x77841ae44c58) locale list changing from [] to [en-US] 2025-07-14 19:12:21.256 15048-15048 GraphicsEnvironment com.example.baiyunmap V Currently set values for: 2025-07-14 19:12:21.256 15048-15048 GraphicsEnvironment com.example.baiyunmap V angle_gl_driver_selection_pkgs=[] 2025-07-14 19:12:21.256 15048-15048 GraphicsEnvironment com.example.baiyunmap V angle_gl_driver_selection_values=[] 2025-07-14 19:12:21.256 15048-15048 GraphicsEnvironment com.example.baiyunmap V com.example.baiyunmap is not listed in per-application setting 2025-07-14 19:12:21.256 15048-15048 GraphicsEnvironment com.example.baiyunmap V ANGLE allowlist from config: 2025-07-14 19:12:21.256 15048-15048 GraphicsEnvironment com.example.baiyunmap V com.example.baiyunmap is not listed in ANGLE allowlist or settings, returning default 2025-07-14 19:12:21.256 15048-15048 GraphicsEnvironment com.example.baiyunmap V Neither updatable production driver nor prerelease driver is supported. 2025-07-14 19:12:21.270 15048-15048 nativeloader com.example.baiyunmap D Load /data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/lib/x86_64/libBaiduMapSDK_base_v7_6_5.so using class loader ns clns-9 (caller=/data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/base.apk!classes3.dex): ok 2025-07-14 19:12:21.301 15048-15048 CompatChangeReporter com.example.baiyunmap D Compat change id reported: 279646685; UID 10220; state: ENABLED 2025-07-14 19:12:21.314 15048-15048 PermissionCheck com.example.baiyunmap E The authManager is: null; the authCallback is: null; the mContext is: null 2025-07-14 19:12:21.319 15048-15048 BaiduApiAuth com.example.baiyunmap I BaiduApiAuth SDK Version:1.0.32 2025-07-14 19:12:21.334 15048-15085 ashmem com.example.baiyunmap E Pinning is deprecated since Android Q. Please use trim or other methods. 2025-07-14 19:12:21.369 15048-15085 CuidBuddyInfoManager com.example.baiyunmap W galaxy lib host missing meta-data,make sure you know the right way to integrate galaxy 2025-07-14 19:12:21.370 15048-15085 CuidBuddyInfoManager com.example.baiyunmap W galaxy lib host missing meta-data,make sure you know the right way to integrate galaxy 2025-07-14 19:12:21.370 15048-15085 CuidBuddyInfoManager com.example.baiyunmap W galaxy lib host missing meta-data,make sure you know the right way to integrate galaxy 2025-07-14 19:12:21.402 15048-15048 PermissionCheck com.example.baiyunmap E The authManager is: null; the authCallback is: null; the mContext is: null 2025-07-14 19:12:21.418 15048-15087 nativeloader com.example.baiyunmap D Load /data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/lib/x86_64/libtiny_magic.so using class loader ns clns-9 (caller=/data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/base.apk!classes4.dex): ok 2025-07-14 19:12:21.493 15048-15048 PermissionCheck com.example.baiyunmap E permission check result is: -11 2025-07-14 19:12:21.509 15048-15090 DisplayManager com.example.baiyunmap I Choreographer implicitly registered for the refresh rate. 2025-07-14 19:12:21.515 15048-15048 ample.baiyunmap com.example.baiyunmap I AssetManager2(0x77841ae4e578) locale list changing from [] to [en-US] 2025-07-14 19:12:21.532 15048-15048 CompatChangeReporter com.example.baiyunmap D Compat change id reported: 309578419; UID 10220; state: ENABLED 2025-07-14 19:12:21.534 15048-15048 DesktopModeFlags com.example.baiyunmap D Toggle override initialized to: OVERRIDE_UNSET 2025-07-14 19:12:21.536 15048-15090 EGL_emulation com.example.baiyunmap I Opening libGLESv1_CM_emulation.so 2025-07-14 19:12:21.537 15048-15090 EGL_emulation com.example.baiyunmap I Opening libGLESv2_emulation.so 2025-07-14 19:12:21.541 15048-15090 HWUI com.example.baiyunmap W Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without... 2025-07-14 19:12:21.541 15048-15090 HWUI com.example.baiyunmap W Failed to initialize 101010-2 format, error = EGL_SUCCESS 2025-07-14 19:12:21.569 15048-15048 nativeloader com.example.baiyunmap D Load /data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/lib/x86_64/libBaiduMapSDK_map_for_navi_v7_6_5.so using class loader ns clns-9 (caller=/data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/base.apk): ok 2025-07-14 19:12:21.573 15048-15048 System.err com.example.baiyunmap W java.lang.ClassNotFoundException: Didn't find class "com.baidu.platform.comjni.map.cloudcontrol.NACloudControl" on path: DexPathList[[zip file "/data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/base.apk"],nativeLibraryDirectories=[/data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/lib/x86_64, /data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/base.apk!/lib/x86_64, /system/lib64, /system_ext/lib64]] 2025-07-14 19:12:21.573 15048-15048 System.err com.example.baiyunmap W at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:259) 2025-07-14 19:12:21.574 15048-15048 System.err com.example.baiyunmap W at java.lang.ClassLoader.loadClass(ClassLoader.java:637) 2025-07-14 19:12:21.574 15048-15048 System.err com.example.baiyunmap W at java.lang.ClassLoader.loadClass(ClassLoader.java:573) 2025-07-14 19:12:21.575 15048-15048 System.err com.example.baiyunmap W at java.lang.Runtime.nativeLoad(Native Method) 2025-07-14 19:12:21.575 15048-15048 System.err com.example.baiyunmap W at java.lang.Runtime.loadLibrary0(Runtime.java:1088) 2025-07-14 19:12:21.576 15048-15048 System.err com.example.baiyunmap W at java.lang.Runtime.loadLibrary0(Runtime.java:1012) 2025-07-14 19:12:21.576 15048-15048 System.err com.example.baiyunmap W at java.lang.System.loadLibrary(System.java:1765) 2025-07-14 19:12:21.577 15048-15048 System.err com.example.baiyunmap W at com.baidu.mapsdkplatform.comapi.NativeLoader.a(NativeLoader.java:103) 2025-07-14 19:12:21.577 15048-15048 System.err com.example.baiyunmap W at com.baidu.mapsdkplatform.comapi.NativeLoader.loadLibrary(NativeLoader.java:84) 2025-07-14 19:12:21.577 15048-15048 System.err com.example.baiyunmap W at com.baidu.mapsdkplatform.comapi.map.i.<clinit>(EngineManager.java:272) 2025-07-14 19:12:21.578 15048-15048 System.err com.example.baiyunmap W at com.baidu.mapapi.map.MapView.a(MapView.java:456) 2025-07-14 19:12:21.579 15048-15048 System.err com.example.baiyunmap W at com.baidu.mapapi.map.MapView.<init>(MapView.java:179) 2025-07-14 19:12:21.579 15048-15048 System.err com.example.baiyunmap W at java.lang.reflect.Constructor.newInstance0(Native Method) 2025-07-14 19:12:21.579 15048-15048 System.err com.example.baiyunmap W at java.lang.reflect.Constructor.newInstance(Constructor.java:343) 2025-07-14 19:12:21.579 15048-15048 System.err com.example.baiyunmap W at android.view.LayoutInflater.createView(LayoutInflater.java:743) 2025-07-14 19:12:21.579 15048-15048 System.err com.example.baiyunmap W at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:895) 2025-07-14 19:12:21.580 15048-15048 System.err com.example.baiyunmap W at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:850) 2025-07-14 19:12:21.581 15048-15048 System.err com.example.baiyunmap W at android.view.LayoutInflater.rInflate(LayoutInflater.java:1012) 2025-07-14 19:12:21.581 15048-15048 System.err com.example.baiyunmap W at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:973) 2025-07-14 19:12:21.582 15048-15048 System.err com.example.baiyunmap W at android.view.LayoutInflater.inflate(LayoutInflater.java:571) 2025-07-14 19:12:21.582 15048-15048 System.err com.example.baiyunmap W at android.view.LayoutInflater.inflate(LayoutInflater.java:462) 2025-07-14 19:12:21.582 15048-15048 System.err com.example.baiyunmap W at android.view.LayoutInflater.inflate(LayoutInflater.java:413) 2025-07-14 19:12:21.582 15048-15048 System.err com.example.baiyunmap W at com.android.internal.policy.PhoneWindow.setContentView(PhoneWindow.java:577) 2025-07-14 19:12:21.583 15048-15048 System.err com.example.baiyunmap W at android.app.Activity.setContentView(Activity.java:3892) 2025-07-14 19:12:21.583 15048-15048 System.err com.example.baiyunmap W at com.example.baiyunmap.MainActivity.onCreate(MainActivity.java:78) 2025-07-14 19:12:21.583 15048-15048 System.err com.example.baiyunmap W at android.app.Activity.performCreate(Activity.java:9155) 2025-07-14 19:12:21.583 15048-15048 System.err com.example.baiyunmap W at android.app.Activity.performCreate(Activity.java:9133) 2025-07-14 19:12:21.583 15048-15048 System.err com.example.baiyunmap W at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1521) 2025-07-14 19:12:21.583 15048-15048 System.err com.example.baiyunmap W at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:4262) 2025-07-14 19:12:21.583 15048-15048 System.err com.example.baiyunmap W at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:4467) 2025-07-14 19:12:21.584 15048-15048 System.err com.example.baiyunmap W at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:222) 2025-07-14 19:12:21.584 15048-15048 System.err com.example.baiyunmap W at android.app.servertransaction.TransactionExecutor.executeNonLifecycleItem(TransactionExecutor.java:133) 2025-07-14 19:12:21.585 15048-15048 System.err com.example.baiyunmap W at android.app.servertransaction.TransactionExecutor.executeTransactionItems(TransactionExecutor.java:103) 2025-07-14 19:12:21.585 15048-15048 System.err com.example.baiyunmap W at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:80) 2025-07-14 19:12:21.586 15048-15048 System.err com.example.baiyunmap W at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2823) 2025-07-14 19:12:21.586 15048-15048 System.err com.example.baiyunmap W at android.os.Handler.dispatchMessage(Handler.java:110) 2025-07-14 19:12:21.586 15048-15048 System.err com.example.baiyunmap W at android.os.Looper.loopOnce(Looper.java:248) 2025-07-14 19:12:21.586 15048-15048 System.err com.example.baiyunmap W at android.os.Looper.loop(Looper.java:338) 2025-07-14 19:12:21.586 15048-15048 System.err com.example.baiyunmap W at android.app.ActivityThread.main(ActivityThread.java:9067) 2025-07-14 19:12:21.586 15048-15048 System.err com.example.baiyunmap W at java.lang.reflect.Method.invoke(Native Method) 2025-07-14 19:12:21.587 15048-15048 System.err com.example.baiyunmap W at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:593) 2025-07-14 19:12:21.587 15048-15048 System.err com.example.baiyunmap W at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:932) 2025-07-14 19:12:21.590 15048-15048 ample.baiyunmap com.example.baiyunmap W CheckJNI: method to register "nativeSetLayerTag" not in the given class. This is slow, consider changing your RegisterNatives calls. 2025-07-14 19:12:21.608 15048-15097 DEBUG com.example.baiyunmap D ThreadProc, CVSocketMan::SocketThreadProc start ... 2025-07-14 19:12:21.611 15048-15048 NetworkLogic com.example.baiyunmap D onNetWorkChanged-0, oldType = mobile 2025-07-14 19:12:21.613 15048-15048 PermissionCheck com.example.baiyunmap E permission check result is: -11 2025-07-14 19:12:21.613 15048-15098 NetworkLogic com.example.baiyunmap D NetworkDetect 2025-07-14 19:12:21.621 15048-15098 DEBUG com.example.baiyunmap D CNetworkDetectEngine::NetworkDetect Start 1 2025-07-14 19:12:21.664 15048-15048 libc com.example.baiyunmap A Fatal signal 11 (SIGSEGV), code 128 (SI_KERNEL), fault addr 0x0 in tid 15048 (ample.baiyunmap), pid 15048 (ample.baiyunmap) 2025-07-14 19:12:22.746 15112-15112 DEBUG crash_dump64 A Cmdline: com.example.baiyunmap 2025-07-14 19:12:22.746 15112-15112 DEBUG crash_dump64 A pid: 15048, tid: 15048, name: ample.baiyunmap >>> com.example.baiyunmap <<< 2025-07-14 19:12:22.746 15112-15112 DEBUG crash_dump64 A #00 pc 00000000004cab64 /data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/lib/x86_64/libBaiduMapSDK_map_for_navi_v7_6_5.so (_baidu_framework::CBaseLayer::CBaseLayer()+148) (BuildId: 72389d7e76ac01b9603c2b9a85daaaadbdc06757) 2025-07-14 19:12:22.746 15112-15112 DEBUG crash_dump64 A #01 pc 000000000072d769 /data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/lib/x86_64/libBaiduMapSDK_map_for_navi_v7_6_5.so (BuildId: 72389d7e76ac01b9603c2b9a85daaaadbdc06757) 2025-07-14 19:12:22.746 15112-15112 DEBUG crash_dump64 A #02 pc 0000000000741036 /data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/lib/x86_64/libBaiduMapSDK_map_for_navi_v7_6_5.so (BuildId: 72389d7e76ac01b9603c2b9a85daaaadbdc06757) 2025-07-14 19:12:22.746 15112-15112 DEBUG crash_dump64 A #03 pc 000000000043abb0 /data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/lib/x86_64/libBaiduMapSDK_map_for_navi_v7_6_5.so (_baidu_framework::CVComServer::ComCreateInstance(_baidu_vi::CVString const&, _baidu_vi::CVString const&, void**)+112) (BuildId: 72389d7e76ac01b9603c2b9a85daaaadbdc06757) 2025-07-14 19:12:22.746 15112-15112 DEBUG crash_dump64 A #04 pc 000000000052e8b1 /data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/lib/x86_64/libBaiduMapSDK_map_for_navi_v7_6_5.so (BuildId: 72389d7e76ac01b9603c2b9a85daaaadbdc06757) 2025-07-14 19:12:22.746 15112-15112 DEBUG crash_dump64 A #05 pc 0000000000530502 /data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/lib/x86_64/libBaiduMapSDK_map_for_navi_v7_6_5.so (BuildId: 72389d7e76ac01b9603c2b9a85daaaadbdc06757) 2025-07-14 19:12:22.746 15112-15112 DEBUG crash_dump64 A #06 pc 0000000000522990 /data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/lib/x86_64/libBaiduMapSDK_map_for_navi_v7_6_5.so (_baidu_framework::IVMapbaseFactory::CreateInstance(_baidu_vi::CVString const&, void**)+128) (BuildId: 72389d7e76ac01b9603c2b9a85daaaadbdc06757) 2025-07-14 19:12:22.746 15112-15112 DEBUG crash_dump64 A #07 pc 000000000043abb0 /data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/lib/x86_64/libBaiduMapSDK_map_for_navi_v7_6_5.so (_baidu_framework::CVComServer::ComCreateInstance(_baidu_vi::CVString const&, _baidu_vi::CVString const&, void**)+112) (BuildId: 72389d7e76ac01b9603c2b9a85daaaadbdc06757) 2025-07-14 19:12:22.746 15112-15112 DEBUG crash_dump64 A #08 pc 000000000048b694 /data/app/~~OljfxsydegH-sraOS4Y7Kg==/com.example.baiyunmap-QyH9YPNP5Ohzcm110rmefQ==/lib/x86_64/libBaiduMapSDK_map_for_navi_v7_6_5.so (BuildId: 72389d7e76ac01b9603c2b9a85daaaadbdc06757) 2025-07-14 19:12:22.750 15112-15112 DEBUG crash_dump64 A #143 pc 000000000000161c <anonymous:7784fd1de000> (com.example.baiyunmap.MainActivity.onCreate+0)
最新发布
07-15
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText()' on a null object reference at com.example.baiyunmap.MainActivity.onCreate...
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.Str
轻烟绕指柔
03-21 1万+
载入布局文件时出错 原因是XML文件中,  写成   Text下没有提示错误: <view android:layout_width="match_parent" android:layout_height="@dimen/default_parting_line" android:background="@color/gray_line"> 在
Caused by:java.lang.NullPointerException: Attempt to invoke virtual method ‘boolean java.lang.Stri
番茄珊.tomato33的专栏
02-08 1万+
遇到这个错误： Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference 1、可能布局文件 中View标签没有大写，例如 <View android:layout_width="match_parent" android:l.
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.Stri
提笔不为风雅
03-15 5060
安卓开发问题集锦： Caused by: java.lang.NullPointerException: Attempt to invoke virtual method ‘boolean java.lang.String.equals(java.lang.Object)’ on a null object reference 问题现象： 打开Activity出现闪退，并抛出以上异常，通...
Android Studio记录一个错误：java.lang.NullPointerException: Attempt to invoke virtual method ‘void android.
weixin_45208598的博客
07-21 1万+
这里写目录标题错误解决 错误 java.lang.NullPointerException: Attempt to invoke virtual method ‘void android.widget.TextView.setText(java.lang.CharSequence)’ on a null object reference E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.dialogdownapplicatio
求大神帮忙看看： Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean androi
qq_38713915的博客
02-09 2055
日志报错：E/AndroidRuntime: FATAL EXCEPTION: main Process: com.newsClient.activity, PID: 4422 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.newsClient.activity/com.newsClient.activ...
java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.XmlResourcePa
qq_36856047的博客
02-12 3556
今天遇到的问题： app apk更新的时候遇到的问题 W/System.err: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.XmlResourceParser android.content.pm.ProviderInfo.loadXmlMetaData(andro...
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget错误解
xqy3177563的博客
04-18 1万+
错误如下： 2019-04-18 16:23:15.867 17729-17729/com.example.persistencedemo E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.persistencedemo, PID: 17729 java.lang.RuntimeException: Unab...
android studio 运行活动闪退Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'vo
sf9090的博客
05-04 1万+
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method ‘void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)’ on a null object reference at com.example...
System.err: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.ContentResolver android.content.Context.getContentResolver()' on a null object reference
04-02
<think>嗯，用户遇到了Java中的NullPointerException，特别是在调用Android的Context.getContentResolver()方法时出现空对象引用的问题。我需要先理解这个问题的常见原因和解决方法。首先，NullPointerException通常是因为调用了一个null对象的方法或者访问其属性。在这种情况下，Context对象本身可能是null，导致调用getContentResolver()时抛出异常。 用户提到的问题可能发生在他们获取ContentResolver的时候。比如，在Activity或Service之外的地方使用了Context，而没有正确初始化它。例如，如果在自定义的类中没有正确传递Context实例，或者在某些回调中Context已经被销毁了，这时候Context可能为null。 接下来，我需要考虑解决方案。首先，确保Context对象不为null。在Android中，Activity和Service本身就是Context的子类，所以如果在这些组件内部使用，通常不会有问题。但如果是在其他类中，比如自定义View或工具类，就需要通过构造函数或方法参数传递有效的Context实例。 另外，需要注意Context的生命周期。例如，在Fragment中，使用getActivity()获取的Context可能在Fragment被分离后变为null，这时候需要检查是否有效。或者，在异步任务中，比如AsyncTask或RxJava的订阅中，如果在后台线程执行时Activity已经被销毁，Context可能已经不可用，这时候需要确保在UI线程更新或使用Application Context，如果适用的话。 还有，用户可能需要检查他们获取ContentResolver的方式是否正确。例如，是否在非UI线程中调用了需要Context的方法，或者是否在某些Context不允许的情况下使用了它。比如，Application Context在某些情况下可能无法使用，需要使用Activity的Context。 此外，代码中是否有其他地方导致Context被置为null，比如内存泄漏或错误的内存管理。使用弱引用或者确保不持有Activity的Context超过必要的时间，可以避免一些潜在的问题。 然后，根据提供的引用，用户可能在其他地方遇到类似的问题，比如从查询参数中提取授权代码时处理空值，或者在处理视图的padding时考虑布局方向。这些引用虽然不完全相关，但可以提醒用户检查代码中其他可能的空值情况，并采用防御性编程的策略，比如添加空值检查或使用Optional类。 最后，应该建议用户使用日志或调试工具来跟踪Context对象在何时何地变为null，从而更精确地定位问题。例如，在调用getContentResolver()之前打印Context是否为null，或者在可能的情况下使用断言或单元测试来验证代码的健壮性。</think>要解决Android开发中调用$context.getContentResolver()$时出现的空指针异常，需从以下关键点逐步排查： ### 一、根本原因分析 1. **空上下文对象**：当$context$未初始化或已销毁时，调用其方法会触发$NullPointerException$，常见于： - 非UI组件中未正确传递上下文 - 异步回调时上下文已被回收 - 自定义View构造方法使用错误上下文 2. **生命周期管理不当**：如Fragment中使用已分离Activity的上下文： ```java // 错误示例 public class MyFragment extends Fragment { void badMethod() { ContentResolver resolver = getActivity().getContentResolver(); // 可能为null } } ``` ### 二、解决方案 #### 1. 上下文有效性验证（强制检查） ```java if(context != null && context.getContentResolver() != null) { ContentResolver resolver = context.getContentResolver(); // 操作内容解析器 } else { Log.e("TAG", "无效上下文环境"); } ``` #### 2. 上下文注入模式（推荐） ```java public class CustomClass { private final Context mContext; // 通过构造器注入有效上下文 public CustomClass(Context context) { this.mContext = context.getApplicationContext(); // 使用应用级上下文 } public void safeAccess() { ContentResolver resolver = mContext.getContentResolver(); } } ``` #### 3. 生命周期感知（适用于组件） ```java // 使用AndroidX的LifecycleObserver public class MyObserver implements LifecycleObserver { @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY) void cleanup() { // 自动释放资源 } } ``` ### 三、防御性编程技巧 1. **空对象模式**：创建自定义非空上下文代理 ```java public class SafeContextWrapper { private final Context mDelegate; public SafeContextWrapper(Context ctx) { mDelegate = ctx != null ? ctx : new ApplicationContext(); } public ContentResolver getContentResolver() { return mDelegate.getContentResolver(); } } ``` 2. **静态分析工具**： - 启用Android Lint检查 - 使用FindBugs的@NonNull注解 ```java public void processData(@NonNull Context context) { // 编译器强制非空校验 } ``` ### 四、典型错误场景 1. **异步任务泄漏**： ```java new Thread(() -> { // 错误：可能使用已销毁的Activity上下文 getActivity().getContentResolver().query(...); }).start(); ``` **修正方案**： ```java final Context appContext = getApplicationContext(); new Thread(() -> { appContext.getContentResolver().query(...); }).start(); ``` 2. **视图初始化时序**： ```xml <!-- 错误：自定义视图构造方法使用错误上下文 --> <com.example.CustomView android:layout_width="match_parent" android:layout_height="match_parent"/> ``` **修正方案**： ```java public CustomView(Context context, AttributeSet attrs) { super(context, attrs); // 使用正确的上下文构造 } ``` ### 五、调试技巧 1. 堆栈追踪分析： ``` java.lang.NullPointerException: at com.example.MyActivity.onCreate(MyActivity.java:25) ``` 定位到具体代码行后，检查所有可能为null的对象链 2. 使用Android Studio的Evaluate Expression功能实时验证上下文状态
评论
添加红包

请填写红包祝福语或标题

个

红包个数最小为10个

元

红包金额最低5元

当前余额3.43元 前往充值 >
需支付：10.00元
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付元
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明：

1.余额是钱包充值的虚拟货币，按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载，可以购买VIP、付费专栏及课程。

余额充值