R.java was modified manually! Reverting to generated version!(R文件丢失异常原因汇总)

本文总结了R文件丢失异常的多种原因及解决方法,包括中文路径、错误编码、XML文件格式问题等,并提供了Eclipse环境下的配置指导。

引言:

R文件丢失异常在java开发中是个比较常见的异常,造成这个异常的原因可能非常微小,但是给Android开发者们造成的麻烦可是巨大的,当程序员们费尽千辛万苦,找到自己错在哪里的时候,绝对会对自己的粗心大意而捶胸顿足,哀叹不已。


异常提示:

R.java was modified manually! Reverting to generated version!
或者项目中gen目录下没有生成R文件,运行项目的时候会报错

我的错误:

最近一次我出现这个错误是因为新电脑中的Eclipse中指向的Android sdk路径中带有中文路径,项目workspace中也有中文路径,在我将这两个中文路径改完之后,R文件就重新恢复了。
比较坑的是另一个同事的错误原因,在他出现R文件丢失异常之后,Android技术组长来看了半天,没有发现哪里错误,最后出动总监大人,总监大人花费了不少时间之后,终于发现错误原因:项目命名为Android_demo,但是其中的下划线_是中文打出的,不是英文,所以出现了这个问题,同事的电脑是MAC,而我的电脑是windows,我并没有在自己的电脑上找出怎么打出中文的_,所以出现这个问题的概率还是很小的。

其他原因:

下面我们来说说其他可能造成R文件丢失的原因:

1.项目编码不对,在导入其他人项目的时候可能出现,在这里要建议大家最好把自己的eclipse编码设置为UTF-8最好,大部分项目都会使用这个编码,如果设置这个编码之后你导入的项目还是出现乱码、R文件丢失之类的问题,那你可以换成GBK编码,如果你要导入的项目是其他编码,那我只能祝你好运,多花点时间找出这是什么编码。

Eclipse设置默认编码:Window——Preferences——General——workspace,然后在下方的Text file encoding中选择Other——UTF-8(注意,这是一个输入框,不仅仅是下拉选择框,当你找不到GBK编码的时候,可以手动输入)即可。

Eclipse中单独项目设置编码:右键项目——Properties——Resource——Text file encoding,在Other中选择UTF-8即可(这里也可以手动输入编码).

2.xml(包括layout布局、values资源以及其他xml文件)文件出错:可能是你xml格式出错,也可能是你的xml中某些属性忘了设置,甚至可能是你引用了错误的xml文件。
解决办法:xml格式出错的时候一般res文件夹及其子文件夹都会出现一个小叉号,这时候就要好好检查相应的报错的xml文件了,但是如果没有报错,那你可以试试将项目的xml文件都恢复到没有出现异常之前的版本,然后一一检查你修改后的xml文件。

3.xml文件和drawable下资源文件不可以为大写字母和数字
解决办法:将相应文件名改为小写字母或者小写字母和数字混搭的命名。

4.Eclipse或者adt插件版本问题,在adt19版本的时候就出现过bug
解决办法:升级最新已经修复bug的版本或者卸载现有版本,使用成熟的旧版本插件,建议使用android开发官网的ADT

5.项目sdk版本太低或者版本不对
解决办法:右键项目——properties——Android,选择相应的sdk版本,点击Apply——OK即可。

下面还有几种解决措施可以 帮助大家修复R文件丢失异常:
  • 选择Eclipse菜单栏——Project,点击Build Automatically,使其处于勾选状态即可,这样在你修改完项目之后Eclipse就会及时的帮你自动编译,跟新R文件;
  • 选中项目,Project——Clean...,这样会清除掉旧版本的各种生成文件,并产生最新的项目生成文件,跟新R文件;
  • 右键项目,Android Tools——Fix Project Properties,会修复项目中的问题。

好了,以上就是我知道和总结的R文件丢失异常了,如果大家还有其他的产生这个异常的情况和解决办法,欢迎留言讨论,谢谢~~~

Language support for Java ™ for Visual Studio Code Visual Studio Marketplace Installs Join the chat at https://gitter.im/redhat-developer/vscode-java Build Status License Provides Java ™ language support via Eclipse ™ JDT Language Server, which utilizes Eclipse ™ JDT, M2Eclipse and Buildship. Quick Start Install the Extension On the following platforms, the extension should activate without any setup : win32-x64, darwin-x64, darwin-arm64, linux-x64, linux-arm64. If on another platform, or using the "universal" version, you can set a Java Development Kit. It must be Java 21 or above. Optionally, download and install a Java Development Kit for your project (Java 1.8 or above is supported). See Project JDKs for more details Extension is activated when you first access a Java file Recognizes projects with Maven or Gradle build files in the directory hierarchy. Features screencast Supports code from Java 1.8 to Java 24 Maven pom.xml project support Gradle project support (with experimental Android project import support) Standalone Java files support As-you-type reporting of parsing and compilation errors Code completion Code/Source actions / Refactoring Javadoc hovers Organize imports triggered manually or on save when pasting code into a java file with Ctrl+Shift+v (Cmd+Shift+v on Mac). Type search Code outline Code folding Code navigation Code lens (references/implementations) Highlights Code formatting (on-type/selection/file) Code snippets Annotation processing support (automatic for Maven projects) Semantic selection Diagnostic tags Call Hierarchy Type Hierarchy To launch and debug your Java programs, it's recommended you install Java Debug Extension for Visual Studio Code. See the changelog for the latest release. You might also find useful information in the project Wiki. Setting the JDK Java Tooling JDK Now that Java extension will publish platform specific versions, it will embed a JRE for supported platforms such as win32-x64, linux-x64, linux-arm64, darwin-x64, darwin-arm64. The embedded JRE is used to launch the Language Server for Java. Users are only responsible for configuring Project JDKs to compile your Java projects. The following part is only kept for the universal version without embedded JRE. The tooling JDK will be used to launch the Language Server for Java. And by default, will also be used to compile your projects. Java 21 is the minimum required version. The path to the Java Development Kit can be specified by the java.jdt.ls.java.home setting in VS Code settings (workspace/user settings). If not specified, it is searched in the following order until a JDK meets current minimum requirement. the JDK_HOME environment variable the JAVA_HOME environment variable on the current system path Project JDKs If you need to compile your projects against a different JDK version, it's recommended you configure the java.configuration.runtimes property in your user settings, eg: "java.configuration.runtimes": [ { "name": "JavaSE-1.8", "path": "/path/to/jdk-8", }, { "name": "JavaSE-11", "path": "/path/to/jdk-11", }, { "name": "JavaSE-24", "path": "/path/to/jdk-24", "default": true }, ] The default runtime will be used when you open standalone Java files. Available commands The following commands are available: Switch to Standard Mode: switches the Java Language Server to Standard mode. This command is only available when the Java Language Server is in LightWeight mode. Java: Reload Projects (Shift+Alt+U): It forces project configuration / classpath updates (eg. dependency changes or Java compilation level), according to the project build descriptor. Java: Import Java Projects into Workspace: detects and imports all the Java projects into the Java Language Server workspace. Java: Open Java Language Server Log File: opens the Java Language Server log file, useful for troubleshooting problems. Java: Open Java Extension Log File: opens the Java extension log file, useful for troubleshooting problems. Java: Open All Log Files: opens both the Java Language Server log file and the Java extension log file. Java: Force Java Compilation (Shift+Alt+B): manually triggers compilation of the workspace. Java: Rebuild Projects: manually triggers a full build of the selected projects. Java: Open Java Formatter Settings: opens the Eclipse formatter settings. Creates a new settings file if none exists. Java: Clean Java Language Server Workspace: cleans the Java language server workspace. Java: Attach Source: attaches a jar/zip source to the currently opened binary class file. This command is only available in the editor context menu. Java: Add Folder to Java Source Path: adds the selected folder to its project source path. This command is only available in the file explorer context menu and only works for unmanaged folders. Java: Remove Folder from Java Source Path: removes the selected folder from its project source path. This command is only available in the file explorer context menu and only works for unmanaged folders. Java: List All Java Source Paths: lists all the Java source paths recognized by the Java Language Server workspace. Java: Show Build Job Status: shows the Java Language Server job status in Visual Studio Code terminal. Java: Go to Super Implementation: goes to the super implementation for the current selected symbol in editor. Java: Restart Java Language Server: restarts the Java language server. Supported VS Code settings The following settings are supported: java.home : Deprecated, please use 'java.jdt.ls.java.home' instead. Absolute path to JDK home folder used to launch the Java Language Server. Requires VS Code restart. java.jdt.ls.lombokSupport.enabled: Whether to enable lombok support. Defaults to true. java.jdt.ls.vmargs : Extra VM arguments used to launch the Java Language Server. Requires VS Code restart. java.errors.incompleteClasspath.severity : Specifies the severity of the message when the classpath is incomplete for a Java file. Supported values are ignore, info, warning, error. java.trace.server : Traces the communication between VS Code and the Java language server. java.configuration.updateBuildConfiguration : Specifies how modifications on build files update the Java classpath/configuration. Supported values are disabled (nothing happens), interactive (asks about updating on every modification), automatic (updating is automatically triggered). java.configuration.maven.userSettings : Path to Maven's user settings.xml. java.configuration.checkProjectSettingsExclusions: Deprecated, please use 'java.import.generatesMetadataFilesAtProjectRoot' to control whether to generate the project metadata files at the project root. And use 'files.exclude' to control whether to hide the project metadata files from the file explorer. Controls whether to exclude extension-generated project settings files (.project, .classpath, .factorypath, .settings/) from the file explorer. Defaults to false. java.referencesCodeLens.enabled : Enable/disable the references code lenses. java.implementationCodeLens : Enable/disable the implementations code lens for the provided categories. java.signatureHelp.enabled : Enable/disable signature help support (triggered on (). java.signatureHelp.description.enabled : Enable/disable to show the description in signature help. Defaults to false. java.contentProvider.preferred : Preferred content provider (see 3rd party decompilers available in vscode-java-decompiler). java.import.exclusions : Exclude folders from import via glob patterns. Use ! to negate patterns to allow subfolders imports. You have to include a parent directory. The order is important. java.import.gradle.enabled : Enable/disable the Gradle importer. Specify the Gradle distribution used by the Java extension: java.import.gradle.wrapper.enabled: Use Gradle from the 'gradle-wrapper.properties' file. Defaults to true. java.import.gradle.version: Use Gradle from the specific version if the Gradle wrapper is missing or disabled. java.import.gradle.home: Use Gradle from the specified local installation directory or GRADLE_HOME if the Gradle wrapper is missing or disabled and no 'java.import.gradle.version' is specified. java.import.gradle.arguments: Arguments to pass to Gradle. java.import.gradle.jvmArguments: JVM arguments to pass to Gradle. java.import.gradle.user.home: setting for GRADLE_USER_HOME. java.import.gradle.offline.enabled: Enable/disable the Gradle offline mode. Defaults to false. java.import.maven.enabled : Enable/disable the Maven importer. java.autobuild.enabled : Enable/disable the 'auto build'. java.maxConcurrentBuilds: Set max simultaneous project builds. java.completion.enabled : Enable/disable code completion support. java.completion.guessMethodArguments : Specify how the arguments will be filled during completion. 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For example 'java.awt.*' will hide all types from the awt packages. java.completion.favoriteStaticMembers : Defines a list of static members or types with static members. java.completion.importOrder : Defines the sorting order of import statements. java.format.enabled : Enable/disable the default Java formatter. java.format.settings.url : Specifies the url or file path to the Eclipse formatter xml settings. java.format.settings.profile : Optional formatter profile name from the Eclipse formatter settings. java.format.comments.enabled : Includes the comments during code formatting. java.format.onType.enabled : Enable/disable on-type formatting (triggered on ;, } or <return>). java.foldingRange.enabled: Enable/disable smart folding range support. If disabled, it will use the default indentation-based folding range provided by VS Code. java.maven.downloadSources: Enable/disable download of Maven source artifacts as part of importing Maven projects. java.maven.updateSnapshots: Force update of Snapshots/Releases. Defaults to false. java.codeGeneration.hashCodeEquals.useInstanceof: Use 'instanceof' to compare types when generating the hashCode and equals methods. Defaults to false. java.codeGeneration.hashCodeEquals.useJava7Objects: Use Objects.hash and Objects.equals when generating the hashCode and equals methods. This setting only applies to Java 7 and higher. Defaults to false. java.codeGeneration.useBlocks: Use blocks in 'if' statements when generating the methods. Defaults to false. java.codeGeneration.generateComments: Generate method comments when generating the methods. Defaults to false. java.codeGeneration.toString.template: The template for generating the toString method. Defaults to ${object.className} [${member.name()}=${member.value}, ${otherMembers}]. java.codeGeneration.toString.codeStyle: The code style for generating the toString method. Defaults to STRING_CONCATENATION. java.codeGeneration.toString.skipNullValues: Skip null values when generating the toString method. Defaults to false. java.codeGeneration.toString.listArrayContents: List contents of arrays instead of using native toString(). Defaults to true. java.codeGeneration.toString.limitElements: Limit number of items in arrays/collections/maps to list, if 0 then list all. Defaults to 0. java.selectionRange.enabled: Enable/disable Smart Selection support for Java. Disabling this option will not affect the VS Code built-in word-based and bracket-based smart selection. java.showBuildStatusOnStart.enabled: Automatically show build status on startup, defaults to notification. notification: Show the build status via progress notification. terminal: Show the build status via terminal. off: Do not show any build status. For backward compatibility, this setting also accepts boolean value, where true has the same meaning as notification and false has the same meaning as off. java.project.outputPath: A relative path to the workspace where stores the compiled output. Only effective in the WORKSPACE scope. The setting will NOT affect Maven or Gradle project. java.project.referencedLibraries: Configure glob patterns for referencing local libraries to a Java project. java.completion.maxResults: Maximum number of completion results (not including snippets). 0 (the default value) disables the limit, all results are returned. In case of performance problems, consider setting a sensible limit. java.configuration.runtimes: Map Java Execution Environments to local JDKs. java.server.launchMode: Standard: Provides full features such as intellisense, refactoring, building, Maven/Gradle support etc. LightWeight: Starts a syntax server with lower start-up cost. Only provides syntax features such as outline, navigation, javadoc, syntax errors. The lightweight mode won't load thirdparty extensions, such as java test runner, java debugger, etc. Hybrid: Provides full features with better responsiveness. It starts a standard language server and a secondary syntax server. The syntax server provides syntax features until the standard server is ready. And the syntax server will be shutdown automatically after the standard server is fully ready. Default launch mode is Hybrid. Legacy mode is Standard java.sources.organizeImports.starThreshold: Specifies the number of imports added before a star-import declaration is used, default is 99. java.sources.organizeImports.staticStarThreshold: Specifies the number of static imports added before a star-import declaration is used, default is 99. java.imports.gradle.wrapper.checksums: Defines allowed/disallowed SHA-256 checksums of Gradle Wrappers. java.project.importOnFirstTimeStartup: Specifies whether to import the Java projects, when opening the folder in Hybrid mode for the first time. Supported values are disabled (never imports), interactive (asks to import or not), automatic (always imports). Default to automatic. java.project.importHint: Enable/disable the server-mode switch information, when Java projects import is skipped on startup. Defaults to true. java.import.gradle.java.home: Specifies the location to the JVM used to run the Gradle daemon. java.project.resourceFilters: Excludes files and folders from being refreshed by the Java Language Server, which can improve the overall performance. For example, ["node_modules",".git"] will exclude all files and folders named 'node_modules' or '.git'. Pattern expressions must be compatible with java.util.regex.Pattern. Defaults to ["node_modules",".git"]. java.templates.fileHeader: Specifies the file header comment for new Java file. Supports configuring multi-line comments with an array of strings, and using ${variable} to reference the predefined variables. java.templates.typeComment: Specifies the type comment for new Java type. Supports configuring multi-line comments with an array of strings, and using ${variable} to reference the predefined variables. java.references.includeAccessors: Include getter, setter and builder/constructor when finding references. Default to true. java.configuration.maven.globalSettings : Path to Maven's global settings.xml. java.configuration.maven.lifecycleMappings : Path to Maven's lifecycle mappings xml. java.eclipse.downloadSources : Enable/disable download of Maven source artifacts for Eclipse projects. java.references.includeDecompiledSources : Include the decompiled sources when finding references. Default to true. java.project.sourcePaths: Relative paths to the workspace where stores the source files. Only effective in the WORKSPACE scope. The setting will NOT affect Maven or Gradle project. java.typeHierarchy.lazyLoad: Enable/disable lazy loading the content in type hierarchy. Lazy loading could save a lot of loading time but every type should be expanded manually to load its content. java.codeGeneration.insertionLocation: Specifies the insertion location of the code generated by source actions. Defaults to afterCursor. afterCursor: Insert the generated code after the member where the cursor is located. beforeCursor: Insert the generated code before the member where the cursor is located. lastMember: Insert the generated code as the last member of the target type. java.codeGeneration.addFinalForNewDeclaration: Whether to generate the 'final' modifer for code actions that create new declarations. Defaults to none. none: Do not generate final modifier fields: Generate 'final' modifier only for new field declarations variables: Generate 'final' modifier only for new variable declarations all: Generate 'final' modifier for all new declarations java.settings.url : Specifies the url or file path to the workspace Java settings. See Setting Global Preferences java.symbols.includeSourceMethodDeclarations : Include method declarations from source files in symbol search. Defaults to false. java.quickfix.showAt : Show quickfixes at the problem or line level. java.configuration.workspaceCacheLimit : The number of days (if enabled) to keep unused workspace cache data. Beyond this limit, cached workspace data may be removed. java.import.generatesMetadataFilesAtProjectRoot : Specify whether the project metadata files(.project, .classpath, .factorypath, .settings/) will be generated at the project root. Defaults to false. java.inlayHints.parameterNames.enabled: Enable/disable inlay hints for parameter names. Supported values are: none(disable parameter name hints), literals(Enable parameter name hints only for literal arguments) and all(Enable parameter name hints for literal and non-literal arguments). Defaults to literals. java.compile.nullAnalysis.nonnull: Specify the Nonnull annotation types to be used for null analysis. If more than one annotation is specified, then the topmost annotation will be used first if it exists in your project dependencies. This setting will be ignored if java.compile.nullAnalysis.mode is set to disabled. java.compile.nullAnalysis.nullable: Specify the Nullable annotation types to be used for null analysis. If more than one annotation is specified, then the topmost annotation will be used first if it exists in your project dependencies. This setting will be ignored if java.compile.nullAnalysis.mode is set to disabled. java.compile.nullAnalysis.nonnullbydefault: Specify the NonNullByDefault annotation types to be used for null analysis. If more than one annotation is specified, then the topmost annotation will be used first if it exists in your project dependencies. This setting will be ignored if java.compile.nullAnalysis.mode is set to disabled. java.import.maven.offline.enabled: Enable/disable the Maven offline mode. Defaults to false. java.codeAction.sortMembers.avoidVolatileChanges: Reordering of fields, enum constants, and initializers can result in semantic and runtime changes due to different initialization and persistence order. This setting prevents this from occurring. Defaults to true. java.jdt.ls.protobufSupport.enabled: Specify whether to automatically add Protobuf output source directories to the classpath. Note: Only works for Gradle com.google.protobuf plugin 0.8.4 or higher. Defaults to true. java.jdt.ls.androidSupport.enabled: [Experimental] Specify whether to enable Android project importing. When set to auto, the Android support will be enabled in Visual Studio Code - Insiders. Note: Only works for Android Gradle Plugin 3.2.0 or higher. Defaults to auto. java.completion.postfix.enabled: Enable/disable postfix completion support. Defaults to true. java.completion.chain.enabled: Enable/disable chain completion support. Defaults to false. java.completion.matchCase: Specify whether to match case for code completion. Defaults to firstLetter. java.compile.nullAnalysis.mode: Specify how to enable the annotation-based null analysis. Supported values are disabled (disable the null analysis), interactive (asks when null annotation types are detected), automatic (automatically enable null analysis when null annotation types are detected). Defaults to interactive. java.cleanup.actionsOnSave: Deprecated, please use 'java.cleanup.actions' instead. The list of clean ups to be run on the current document when it's saved. Clean ups can automatically fix code style or programming mistakes. Click here to learn more about what each clean up does. java.cleanup.actions: The list of clean ups to be run on the current document when it's saved or when the cleanup command is issued. Clean ups can automatically fix code style or programming mistakes. Click here to learn more about what each clean up does. java.saveActions.cleanup: Enable/disable cleanup actions on save. java.import.gradle.annotationProcessing.enabled: Enable/disable the annotation processing on Gradle projects and delegate to JDT APT. Only works for Gradle 5.2 or higher. java.sharedIndexes.enabled: [Experimental] Specify whether to share indexes between different workspaces. Defaults to auto and the shared indexes is automatically enabled in Visual Studio Code - Insiders. auto on off java.sharedIndexes.location: Specifies a common index location for all workspaces. See default values as follows: Windows: First use "$APPDATA\\.jdt\\index", or "~\\.jdt\\index" if it does not exist macOS: "~/Library/Caches/.jdt/index" Linux: First use "$XDG_CACHE_HOME/.jdt/index", or "~/.cache/.jdt/index" if it does not exist java.refactoring.extract.interface.replace: Specify whether to replace all the occurrences of the subtype with the new extracted interface. Defaults to true. java.import.maven.disableTestClasspathFlag : Enable/disable test classpath segregation. When enabled, this permits the usage of test resources within a Maven project as dependencies within the compile scope of other projects. Defaults to false. java.configuration.maven.defaultMojoExecutionAction : Specifies default mojo execution action when no associated metadata can be detected. Defaults to ignore. java.completion.lazyResolveTextEdit.enabled: [Experimental] Enable/disable lazily resolving text edits for code completion. Defaults to true. java.edit.validateAllOpenBuffersOnChanges: Specifies whether to recheck all open Java files for diagnostics when editing a Java file. Defaults to false. java.editor.reloadChangedSources: Specifies whether to reload the sources of the open class files when their source jar files are changed. Defaults to ask. ask: Ask to reload the sources of the open class files auto: Automatically reload the sources of the open class files manual: Manually reload the sources of the open class files java.edit.smartSemicolonDetection.enabled: Defines the smart semicolon detection. Defaults to false. java.configuration.detectJdksAtStart: Automatically detect JDKs installed on local machine at startup. If you have specified the same JDK version in java.configuration.runtimes, the extension will use that version first. Defaults to true. java.completion.collapseCompletionItems: Enable/disable the collapse of overloaded methods in completion items. Overrides java.completion.guessMethodArguments. Defaults to false. java.diagnostic.filter: Specifies a list of file patterns for which matching documents should not have their diagnostics reported (eg. '**/Foo.java'). java.search.scope: Specifies the scope which must be used for search operation like Find Reference Call Hierarchy Workspace Symbols java.jdt.ls.javac.enabled: [Experimental] Specify whether to enable Javac-based compilation in the language server. Requires running this extension with Java 24. Defaults to off. java.completion.engine: [Experimental] Select code completion engine. Defaults to ecj. java.references.includeDeclarations: Include declarations when finding references. Defaults to true java.jdt.ls.appcds.enabled : [Experimental] Enable Java AppCDS (Application Class Data Sharing) for improvements to extension activation. When set to auto, AppCDS will be enabled in Visual Studio Code - Insiders, and for pre-release versions. Semantic Highlighting Semantic Highlighting fixes numerous syntax highlighting issues with the default Java Textmate grammar. However, you might experience a few minor issues, particularly a delay when it kicks in, as it needs to be computed by the Java Language server, when opening a new file or when typing. Semantic highlighting can be disabled for all languages using the editor.semanticHighlighting.enabled setting, or for Java only using language-specific editor settings. Troubleshooting Check the status of the language tools on the lower right corner (marked with A on image below). It should show ready (thumbs up) as on the image below. You can click on the status and open the language tool logs for further information in case of a failure. status indicator Read the troubleshooting guide for collecting informations about issues you might encounter. Report any problems you face to the project. Contributing This is an open source project open to anyone. Contributions are extremely welcome! For information on getting started, refer to the CONTRIBUTING instructions. Continuous Integration builds can be installed from http://download.jboss.org/jbosstools/jdt.ls/staging/. Download the most recent java-<version>.vsix file and install it by following the instructions here. Stable releases are archived under http://download.jboss.org/jbosstools/static/jdt.ls/stable/. Also, you can contribute your own VS Code extension to enhance the existing features by following the instructions here. Feedback Have a question? Start a discussion on GitHub Discussions, File a bug in GitHub Issues, Chat with us on Gitter, Tweet us with other feedback. License EPL 2.0, See LICENSE for more information.
最新发布
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