Multidex Issue with Flutter: Comprehensive Solution Guide

Error Overview

The “Multidex issue with Flutter” arises when your Flutter application exceeds the 64K method limit imposed by the Android operating system. This typically occurs when your application includes many libraries or dependencies, which leads to a significant increase in the number of methods. When this limit is exceeded, Android requires you to implement Multidex support, which allows your app to build and run across multiple DEX files.

Common Causes

Understanding the causes of the Multidex issue with Flutter can help you troubleshoot and resolve it effectively. Common causes include:

1. Large number of dependencies: Incorporating third-party libraries can significantly increase the method count.
2. Low minimum SDK version: Setting a minimum SDK version lower than 21 can trigger Multidex issues.
3. Improper configuration in build.gradle: Errors or omissions in your Android build configuration can hinder Multidex support.
4. Package name mismatch: Changes in the package name may result in discrepancies in the application structure.
5. Old or incompatible libraries: Using outdated libraries that do not support Multidex can lead to complications.

Solution Methods

To resolve the Multidex issue with Flutter, follow these detailed methods:

Method 1: Enable Multidex in build.gradle

1. Open your app/build.gradle file located at [project_folder]/android/app/build.gradle.
2. Locate the defaultConfig section and add the following line:
   groovy
multiDexEnabled true
3. Ensure you have the Multidex dependency in your dependencies section:
   “`groovy
   dependencies