Ionic 3项目执行cordova build android失败，寻求解决帮助

Hey, sorry to hear you’ve been stuck on this for two days—let’s walk through practical fixes to get your build working again. The error points to both a Gradle failure and an unhandled promise rejection in Cordova’s superspawn module, so we’ll tackle both angles:

1. Reset Your Cordova Android Platform #

Corrupted platform files are a super common culprit here. Let’s start fresh:

• Remove the existing Android platform:

  ionic cordova platform remove android
  

• Re-add a stable Android platform version that plays nice with Ionic 3 (Android 8.1.0 is a safe bet—newer versions often break Ionic 3 compatibility):

  ionic cordova platform add android@8.1.0
  

2. Clear Gradle Cache & Fix Environment #

Gradle cache corruption is another frequent issue:

• Delete your local Gradle cache folder: Navigate to C:\Users\ecantero\.gradle and delete the entire directory.
• Verify your Gradle environment setup:
  1. Download Gradle 4.10.3 (the version recommended for Android platform 8.1.0) and extract it to a folder like C:\Gradle\gradle-4.10.3.
  2. Add a GRADLE_HOME system environment variable pointing to that folder.
  3. Add %GRADLE_HOME%\bin to your system PATH.
  4. Test it by opening a new command prompt and running:

     gradle -v
     

     You should see the Gradle version output without errors.

3. Fix the Unhandled Promise Rejection #

The error mentions an unhandled promise in cordova-common—let’s update that dependency:

• In your project root directory, run:

  npm install cordova-common@latest --save-dev
  

• Also, make sure your global Cordova version is compatible with Ionic 3. Update to Cordova 9.0.0 (a stable match):

  npm install -g cordova@9.0.0
  

4. Verify Android SDK Configuration #

Double-check your Android Studio setup:

• Open Android Studio and ensure you’ve installed Android 9.0 (Pie) SDK (API level 28)—this is required for Android platform 8.1.0.
• Go to your project’s platforms/android folder and open the local.properties file. Confirm the sdk.dir path points to your correct Android SDK location, like:

  sdk.dir=C\:\\Users\\ecantero\\AppData\\Local\\Android\\Sdk
  

Last Resort: Full Dependency Reset #

If none of the above works, try a full reset of your project dependencies:

• Delete the node_modules folder and package-lock.json file from your project root.
• Run npm install to reinstall dependencies.
• Repeat the platform remove/re-add steps from section 1.

内容的提问来源于stack exchange，提问作者Emile Cantero