无法解决Android Studio中的符号“菜单"错误 [英] Cannot resolve symbol 'menu' errors in Android Studio

问题描述

我正在从 Github 上提供的.

I'm learning Android Development for Beginners from Udacity and have completed making an app named Court Counter in 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.

但是，当我单击"Build APK"时，我从Java文件中都得到了两个错误:

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

1. 无法解析以下代码中的符号菜单":-

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. 无法解析符号"action_settings":-

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);
}

我不知道执行这些代码块时会发生什么，但是我想在手机上运行该应用程序！

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

推荐答案

我很乐意将其作为对第一个答案的注释，但是我暂时不能.因此，当我在使用Android Studio 2.3时遇到问题时.我清理项目，然后重建:

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:

构建-> 清理项目，然后构建-> 重建项目

Build --> Clean Project and Build --> Rebuild Project

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