升级至Android Studio 3.1.2后遭遇三类技术问题求助

Let’s walk through each of your problems with practical, actionable fixes:

1. Missing Kotlin Class Creation Option #

• Check if the Kotlin plugin is enabled: Head to File > Settings > Plugins (Windows/Linux) or Android Studio > Preferences > Plugins (Mac). Search for "Kotlin"—if it’s disabled, toggle it on and restart Studio.
• Verify Kotlin is configured in your project:
  • Open your root build.gradle and confirm the Kotlin classpath is present:

    buildscript {
        dependencies {
            classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.2.51" // Use a version compatible with AS 3.1.2
        }
    }
    

  • In your app module’s build.gradle, ensure these plugins are applied at the top:

    apply plugin: 'kotlin-android'
    apply plugin: 'kotlin-android-extensions'
    

  • Sync your project after making these changes.

2. No Import Smart Hints #

• Turn on auto-import settings:
  • Go to File > Settings > Editor > General > Auto Import (Windows/Linux) or Android Studio > Preferences > Editor > General > Auto Import.
  • Under both Java and Kotlin sections, check Add unambiguous imports on the fly and Optimize imports on the fly.
• Invalidate caches and restart:
  • Select File > Invalidate Caches / Restart..., then choose Invalidate and Restart. This fixes most cache-related glitches that pop up after upgrades.

3. No Syntax Highlighting (Code Only Gray) #

• Invalidate caches first: As mentioned above, this is the quickest fix for rendering issues like missing syntax color.
• Check file type associations:
  • Navigate to File > Settings > Editor > File Types (Windows/Linux) or Android Studio > Preferences > Editor > File Types.
  • For Kotlin, ensure .kt and .kts are listed under the "Kotlin" file type. If not, add them manually.
• Confirm project language level:
  • Press Ctrl+Alt+Shift+S to open Project Structure. Select your app module, go to the Sources tab, and set the Language level to match your target SDK (e.g., "8 - Lambdas, type annotations etc." for API 26+).
• Reset your color scheme:
  • Go to File > Settings > Editor > Color Scheme (Windows/Linux) or Android Studio > Preferences > Editor > Color Scheme. Pick a default scheme like Darcula or IntelliJ Light and apply it—custom schemes sometimes break during upgrades.

If none of these steps resolve the issues, consider a clean reinstall of Android Studio 3.1.2 (be sure to export your settings first via File > Export Settings).

内容的提问来源于stack exchange，提问作者EL TEGANI MOHAMED