开发中遇到的问题--java.lang.IllegalStateException

本文总结了在实际开发中遇到的java.lang.IllegalStateException异常及其解决方法,包括在使用ViewPager时处理视图重复添加的问题、Fragment放置于Activity容器时的异常处理、视频播放控制异常解决、RxJava线程调度异常避免等。

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在实际开发中经常会遇到java.lang.IllegalStateException的异常。下面是我所遇到的java.lang.IllegalStateException的解决方法:

1.  在APP首页的导航栏,一共有五个栏目,要求一页只显示4个,另外一个在另一页显示,我用ViewPager实现的,将各个栏目LinearLayout包裹起来,然后在代码中动态添加到ViewPager每一个页面的LinearLayout中,然后在添加的过程中报异常java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.

有异常时的代码:

menuList = new ArrayList<LinearLayout>();
        if(photoAlbumIsShow.equals("1")){
            llMenu1.addView(messageBoard,0);
            //家庭相册
            ViewParent vg1 = albumMenu.getParent();
            if(vg != null){
                ViewGroup group = (ViewGroup) vg1;
                group.removeView(albumMenu);
            }
            llMenu1.addView(albumMenu,1);
            llMenu1.addView(nutrientIndex,2);
            llMenu1.addView(basket,3);
            llMenu2.addView(commonProblem,0);
            menuList.add(llMenu1);
            menuList.add(llMenu2);
        }else{
            llMenu1.addView(messageBoard,0);
            llMenu1.addView(nutrientIndex,1);
            llMenu1.addView(basket,2);
            llMenu1.addView(commonProblem,3);
            menuList.add(llMenu1);
            albumMenu.setVisibility(View.GONE);
            llMenu2.setVisibility(View.GONE);
        }

        if (homeMemuAdapter == null) {
            homeMemuAdapter = new HomeMemuAdapter(menuList, mContext, llMenuPoints);
            menuPager.setAdapter(homeMemuAdapter);
        } else {

        }
        menuPager.setOnPageChangeListener(new MenuPagerChangeListner());
        menuPager.setCurrentItem(0);

各个子项向页面中添加时,报java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.解决方法:

在子项添加前,先获取子项的父控件,然后移除父控件中的子项,例如:

//留言板
ViewParent vg = messageBoard.getParent();
if(vg != null){
    ViewGroup group = (ViewGroup) vg;
    group.removeView(messageBoard);
}

2.  将Fragment页放到activity容器中时报java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first
原因:mView = inflater.inflate(R.layout.activity_alarm_list,container);



3.  视频在播放或暂停过程中,按返回键退出。报java.lang.IllegalStateException,

原因:当前对客户端的响应已经结束,不能在响应已经结束(或说消亡)后再向客户端(实际上是缓冲区)输出任何内容。

解决方法:在退出的onDestroy()中没有加player = null

protected void onDestroy(){
    super.onDestroy();
    unregisterReceiver(videoReceiver);
    if(player.isPlaying()){
        player.stop();
    }
    player.release();
    player null;
 
}

4.  java.lang.IllegalStateException: Fatal Exception thrown on Scheduler.Worker

网上的解决方法是:加了红字的部分

observable.subscribeOn(Schedulers.computation())
            .observeOn(AndroidSchedulers.mainThread())
            .unsubscribeOn(Schedulers.io())
            .subscribe(new Subscriber<T>() {
                @Override
                public void onCompleted() {
                }
这个问题我忘记是怎么解决的了。以后遇到再加。


5.  有多个library的项目运行时,报java.lang.IllegalStateException: Required view 'rl_infos' with ID 2131361899 for field 'ivManaBack' and method 'backClick' was not found. If this view is optional add '@Nullable' (fields) or '@Optional' (methods) annotation.

原来运行好好的,突然就出现问题了。多次rebuild和clean都不见效。后来删除板子里的安装,再rebuild和clean了一下,安装后正常。也不知道是rebuld的有效还是重装起的作用。


6.  MainActivity.java页面有四个tab页,第一个是首页,其他依次是圈圈,商城,食材管理和冰箱控制页,在首页点击各个栏目可以跳转到其他tab页,在跳转的过程中弹出了一个dialog,导致出现java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState

跟踪异常,是在transaction.commit();报的。在网上查资料得出:

commit方法是在Activity的onSaveInstanceState()之后调用的,这样会出错,因为onSaveInstanceState方法是在该Activity即将被销毁前调用,来保存Activity数据的,如果在保存玩状态后再给它添加Fragment就会出错。解决办法就是把commit()方法替换成 commitAllowingStateLoss()就行了,其效果是一样的。


7.  小米5手机在获取本地视频时,报CursorWindow: Failed to read row 0, column 2 from a CursorWindow which has 1 rows, 2 columns.

java.lang.IllegalStateException: Couldn't read row 0, col 2 from CursorWindow.  Make sure the Cursor is initialized correctly before accessing data from it.

原因:

Cursor cursor1 = getContentResolver().query(contentURI, null, null,
        null, null);
在打印cursor1.getString(2)时报的异常。

Log.d("video----->",  "视频绝对路径" + cursor1.getString(2));

经过debug,cursor1的长度为2,没有第3个,

cursor1.getString(0)是获取视频文件名,
cursor1.getString(1)是获取视频文件的ID。

获取小米5本地视频的路径Uricontent://com.android.fileexplorer.fileprovider/external_files/tencent/MicroMsg/WeiXin/wx_camera_1490852824886.mp4只能用

contentURI.getPath()拼接。



E:\jdk17\bin\java.exe -XX:TieredStopAtLevel=1 -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:E:\Java Web\IntelliJ IDEA 2023.3.1\lib\idea_rt.jar=54988:E:\Java Web\IntelliJ IDEA 2023.3.1\bin" -Dfile.encoding=UTF-8 -classpath "E:\web projects\StuInfoSystem-master\target\classes;E:\Java Web\javawebb\maven\apache-maven-3.9.9\maven-repo\org\webjars\bootstrap\4.0.0\bootstrap-4.0.0.jar;E:\Java Web\javawebb\maven\apache-maven-3.9.9\maven-repo\org\webjars\npm\popper.js\1.11.1\popper.js-1.11.1.jar;E:\Java Web\javawebb\maven\apache-maven-3.9.9\maven-repo\org\webjars\jquery\3.3.1\jquery-3.3.1.jar;E:\Java Web\javawebb\maven\apache-maven-3.9.9\maven-repo\org\springframework\boot\spring-boot-starter-jdbc\1.5.10.RELEASE\spring-boot-starter-jdbc-1.5.10.RELEASE.jar;E:\Java 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Web\javawebb\maven\apache-maven-3.9.9\maven-repo\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar;E:\Java Web\javawebb\maven\apache-maven-3.9.9\maven-repo\org\springframework\spring-core\4.3.14.RELEASE\spring-core-4.3.14.RELEASE.jar;E:\Java Web\javawebb\maven\apache-maven-3.9.9\maven-repo\junit\junit\4.12\junit-4.12.jar;E:\Java Web\javawebb\maven\apache-maven-3.9.9\maven-repo\org\springframework\boot\spring-boot-configuration-processor\1.5.10.RELEASE\spring-boot-configuration-processor-1.5.10.RELEASE.jar;E:\Java Web\javawebb\maven\apache-maven-3.9.9\maven-repo\org\apache\ibatis\ibatis-core\3.0\ibatis-core-3.0.jar;E:\Java Web\javawebb\maven\apache-maven-3.9.9\maven-repo\javax\servlet\javax.servlet-api\3.1.0\javax.servlet-api-3.1.0.jar;E:\Java Web\javawebb\maven\apache-maven-3.9.9\maven-repo\org\springframework\spring-expression\4.3.16.RELEASE\spring-expression-4.3.16.RELEASE.jar;E:\Java Web\javawebb\maven\apache-maven-3.9.9\maven-repo\com\github\pagehelper\pagehelper-spring-boot-starter\1.2.10\pagehelper-spring-boot-starter-1.2.10.jar;E:\Java Web\javawebb\maven\apache-maven-3.9.9\maven-repo\com\github\pagehelper\pagehelper-spring-boot-autoconfigure\1.2.10\pagehelper-spring-boot-autoconfigure-1.2.10.jar;E:\Java Web\javawebb\maven\apache-maven-3.9.9\maven-repo\com\github\pagehelper\pagehelper\5.1.8\pagehelper-5.1.8.jar;E:\Java Web\javawebb\maven\apache-maven-3.9.9\maven-repo\com\github\jsqlparser\jsqlparser\1.2\jsqlparser-1.2.jar" com.lc.demo.DemoApplication . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v1.5.10.RELEASE) 2025-06-16 21:30:29.153 INFO 27400 --- [ main] com.lc.demo.DemoApplication : Starting DemoApplication on Cui with PID 27400 (started by 19811 in E:\web projects\StuInfoSystem-master) 2025-06-16 21:30:29.159 INFO 27400 --- [ main] com.lc.demo.DemoApplication : No active profile set, falling back to default profiles: default 2025-06-16 21:30:29.441 INFO 27400 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@5a9f4771: startup date [Mon Jun 16 21:30:29 CST 2025]; root of context hierarchy 2025-06-16 21:30:30.143 ERROR 27400 --- [ main] o.s.boot.SpringApplication : Application startup failed java.lang.IllegalStateException: Cannot load configuration class: com.lc.demo.DemoApplication at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:403) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanFactory(ConfigurationClassPostProcessor.java:249) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:283) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:127) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:687) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:525) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE] at com.lc.demo.DemoApplication.main(DemoApplication.java:12) ~[classes/:na] Caused by: java.lang.ExceptionInInitializerError: null at org.springframework.context.annotation.ConfigurationClassEnhancer.newEnhancer(ConfigurationClassEnhancer.java:122) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.context.annotation.ConfigurationClassEnhancer.enhance(ConfigurationClassEnhancer.java:110) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:393) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] ... 12 common frames omitted Caused by: org.springframework.cglib.core.CodeGenerationException: java.lang.reflect.InaccessibleObjectException-->Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @59309333 at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:464) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:336) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:93) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:91) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na] at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:116) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:291) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.cglib.core.KeyFactory$Generator.create(KeyFactory.java:221) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.cglib.core.KeyFactory.create(KeyFactory.java:174) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.cglib.core.KeyFactory.create(KeyFactory.java:153) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.cglib.proxy.Enhancer.<clinit>(Enhancer.java:73) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE] ... 15 common frames omitted Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @59309333 at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354) ~[na:na] at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297) ~[na:na] at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:199) ~[na:na] at java.base/java.lang.reflect.Method.setAccessible(Method.java:193) ~[na:na] at org.springframework.cglib.core.ReflectUtils$1.run(ReflectUtils.java:61) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE] at java.base/java.security.AccessController.doPrivileged(AccessController.java:569) ~[na:na] at org.springframework.cglib.core.ReflectUtils.<clinit>(ReflectUtils.java:52) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.cglib.core.KeyFactory$Generator.generateClass(KeyFactory.java:243) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE] at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:329) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE] ... 27 common frames omitted 2025-06-16 21:30:30.144 INFO 27400 --- [ main] ationConfigEmbeddedWebApplicationContext : Closing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@5a9f4771: startup date [Mon Jun 16 21:30:29 CST 2025]; root of context hierarchy 进程已结束,退出代码为 1
06-17
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