使用Volley时Gradle同步失败：启动失败错误的解决咨询

Hey there, let's break down and fix your problems one by one:

1. Gradle Sync Failure (Unexpected Token: com.android.volley:1.1.0) #

The core issue here is that you've placed your app dependency in the wrong build.gradle file.

• The root project's build.gradle (the one you shared) is meant for configuring build tools and project-wide settings. Its dependencies block under buildscript only accepts classpath entries for things like the Android Gradle Plugin.
• Application dependencies like Volley belong in the module-level build.gradle (usually located at app/build.gradle).

Corrected Root build.gradle #

Remove the Volley line from the root file:

buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.1'
        // Removed: implementation 'com.android.volley:volley:1.1.0'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

Add Volley to Module build.gradle #

Open your app module's build.gradle (under app/), find its dependencies block, and add the Volley line there:

dependencies {
    // ... other existing dependencies (like appcompat, etc.)
    implementation 'com.android.volley:volley:1.1.0'
}

2. NDK Version Unknown #

The "NDK version unknown" message means Gradle can't locate a valid NDK installation for your project. Here's how to fix it:

• Option 1: Specify NDK version in module build.gradle
  Add the ndkVersion line inside the android block of your module's build.gradle (use a version compatible with your Gradle plugin 3.5.1, e.g., 21.4.7075529):

  android {
      compileSdkVersion 29 // or your target SDK version
      buildToolsVersion "29.0.3"
  
      defaultConfig {
          applicationId "your.app.id"
          minSdkVersion 21
          targetSdkVersion 29
          versionCode 1
          versionName "1.0"
  
          // Add this line
          ndkVersion "21.4.7075529"
      }
  }
  

• Option 2: Install NDK via Android Studio
  Open SDK Manager (Tools > SDK Manager), go to the SDK Tools tab, check NDK (Side by side), select a compatible version, and click Apply to install.

After making these changes, click "Sync Now" in Android Studio to apply the fixes.

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