Java 无法解决 Android Studio 中的符号“菜单”错误

Cannot resolve symbol 'menu' errors in Android Studio

提问by Kvaibhav01

I'm learning Android Development for Beginnersfrom Udacityand have completed making an app named Court Counterin which I wrote code for an XML (activity_main.xml) and some code for Java (MainActivity.java) file as some of the code was provided by the Udacity team on Github.

我正在从Udacity学习Android Development for Beginners并完成了一个名为Court Counter的应用程序，其中我为 XML (activity_main.xml) 和一些 Java (MainActivity.java) 文件编写了代码，因为提供了一些代码由Github上的 Udacity 团队提供。

But when I click on 'Build APK' I get two errors both from the Java file:

但是当我点击“构建 APK”时，我从 Java 文件中得到两个错误：

1. Cannot resolve symbol 'menu' in the following code:-

   @Override
   public boolean onCreateOptionsMenu(Menu menu) {
       // Inflate the menu; this adds items to the action bar if it is present.
       getMenuInflater().inflate(R.menu.menu_main, menu);
       return true;
   }
   

1. 无法解析以下代码中的符号“菜单”：-

   @Override
   public boolean onCreateOptionsMenu(Menu menu) {
       // Inflate the menu; this adds items to the action bar if it is present.
       getMenuInflater().inflate(R.menu.menu_main, menu);
       return true;
   }
   

1. Cannot resolve symbol 'action_settings':-

   @Override
   public boolean onOptionsItemSelected(MenuItem item) {
       // Handle action bar item clicks here. The action bar will
       // automatically handle clicks on the Home/Up button, so long
       // as you specify a parent activity in AndroidManifest.xml.
       int id = item.getItemId();
   
       //noinspection SimplifiableIfStatement
       if (id == R.id.action_settings) {
           return true;
       }
   
       return super.onOptionsItemSelected(item);
   }
   

2. 无法解析符号“action_settings”：-

   @Override
   public boolean onOptionsItemSelected(MenuItem item) {
       // Handle action bar item clicks here. The action bar will
       // automatically handle clicks on the Home/Up button, so long
       // as you specify a parent activity in AndroidManifest.xml.
       int id = item.getItemId();
   
       //noinspection SimplifiableIfStatement
       if (id == R.id.action_settings) {
           return true;
       }
   
       return super.onOptionsItemSelected(item);
   }
   

I don't know what happens when these block of code are executed but I want to run the app on my phone!

我不知道执行这些代码块时会发生什么，但我想在手机上运行该应用程序！

采纳答案by dtytomi

I would have love to add this as a comment to the first answer but I can't for now; So when I had the problem using android studio 2.3. I clean the project and then rebuild:

我很想将其添加为第一个答案的评论，但我现在不能；所以当我在使用 android studio 2.3 时遇到问题。我清理项目然后重建：

Build--> Clean Projectand Build--> Rebuild Project

构建-->清理项目并 构建-->重建项目

回答by Manikandan K

Check menu_main.xml is in your res directory. After its not working means, Once, Clear Your project.

检查 menu_main.xml 是否在您的 res 目录中。在它不工作后意味着，一次，清除你的项目。

回答by Neha Sharma

Try this 1) "alt+enter" (R.menu.menu_main, menu)
2) click on make a menu main.xml file (a new file) 3) Disable your antivirus 4) Run the app

试试这个 1) "alt+enter" (R.menu.menu_main, menu)
2) 点击 make a menu main.xml file (a new file) 3) Disable your antivirus 4) Run the app

回答by Toni fernandez

With more than 20 years of experiencie i can tell you a very difficult solution for the menu problem on android studio...:

凭借 20 多年的经验，我可以告诉您一个非常困难的解决 android studio 菜单问题的方法...：

*********** Close the project an open it again ************************

*********** 关闭项目并再次打开它 ************************