Flutter 的 Multidex 问题

我在Android Studio中使用Ffltter使用Gradle编译时出现以下错误:

Dex: Error converting bytecode to dex:
Cause: com.android.dex.DexException: Multiple dex files define Lcom/google/android/gms/internal/zzcew;
UNEXPECTED TOP-LEVEL EXCEPTION:
com.android.dex.DexException: Multiple dex files define Lcom/google/android/gms/internal/zzcew;

[... stacktrace omitted for brevity ...]

* What went wrong:
Execution failed for task ':app:transformDexArchiveWithDexMergerForDebug'.
> com.android.build.api.transform.TransformException: com.android.dex.DexException: Multiple dex files define Lcom/google/android/gms/internal/zzcew;

简本

正如预期的那样，只有当我添加足够的依赖项时，才会发生这种情况.我已经启用了multidex，并按照说明(https://developer.android.com/studio/build/multidex.html)在Android项目build.gradle文件中添加了multidex依赖项，但我不确定如何处理"将您的应用程序配置为Multidex"中的步骤2，甚至不确定该步骤的遗漏是否是问题所在.

重新创建的步骤:

1. 从工具栏中 Select File/New/New Flutter Project
2. Select "Flutter 应用"
3. 包括Kotlin&amp；SWIFT支持
4. 判断应用程序是否编译并运行

5. 将以下内容添加到pubspec.yaml中的依赖项中:

   dependencies:
     flutter_google_place_picker: "^0.0.1"
     location: "^1.2.0"
   

6. 在Android Studio中点击Packages Get或在项目目录中运行flutter packages get

7. 修改android/app/build.gradle，在适当位置增加以下章节:

   dependencies {
     compile 'com.android.support:multidex:1.0.1'
   }
   android {
       defaultConfig {
           multiDexEnabled true
       }
   }
   

8. 从工具栏中 Select Run/Run

我试过的其他东西

1. 将build.gradle中的"编译"依赖项替换为以下各项:

   compile 'com.android.support:multidex:1.0.3'
   implementation 'com.android.support:multidex:1.0.1'
   implementation 'com.android.support:multidex:1.0.3'
   

2. 遵循我的每个依赖项的多重索引步骤；即修改它们的build.gradle个文件，启用多重索引并添加多重依赖项.

3. 将我的项目及其依赖项的build.gradle个文件中的每个文件中的minSdkVersion修改为21和27中的每一个，并为它们启用Multidex.
4. 为我的项目启用缩小功能.
5. 用geolocation: "^0.2.1"代替location: "^1.2.0"

6. 根本不启用Multidex(即跳过重新创建的步骤7).这会导致以下错误:

   FAILURE: Build failed with an exception.
   
   * What went wrong:
   Execution failed for task ':app:transformDexArchiveWithExternalLibsDexMergerForDebug'.
   > java.lang.RuntimeException: java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex
   

Flutter 指示器输出

$ flutter doctor -v
[√] Flutter (Channel beta, v0.2.8, on Microsoft Windows [Version 10.0.16299.371], locale en-GB)
    • Flutter version 0.2.8 at D:\flutter
    • Framework revision b397406561 (2 weeks ago), 2018-04-02 13:53:20 -0700
    • Engine revision c903c217a1
    • Dart version 2.0.0-dev.43.0.flutter-52afcba357

[√] Android toolchain - develop for Android devices (Android SDK 27.0.3)
    • Android SDK at C:\Users\Dave\AppData\Local\Android\sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-27, build-tools 27.0.3
    • Java binary at: D:\AndroidDev\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)
    • All Android licenses accepted.

[√] Android Studio (version 3.1)
    • Android Studio at D:\AndroidDev
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)

[√] Connected devices (1 available)
    • Android SDK built for x86 64 • emulator-5554 • android-x64 • Android 5.1.1 (API 22) (emulator)

• No issues found!