How to migrate to Dependency Injection from an older API?

Migrating to Dependency Injection (DI) from an older API can significantly improve the testability and maintainability of your application. This guide will explore how to perform the migration smoothly using a simple example.

Keywords: Dependency Injection, API Migration, Android Development, Testability, Maintainability, Code Refactoring

Description: Learn how to migrate from an older API to Dependency Injection in Android for improved code structure, better testing capabilities, and enhanced maintainability.

Example Migration

Below is an example of how to refactor an older API that uses hard-coded dependencies to one that employs Dependency Injection:


        // Before: Hard-coded dependency example
        class ApiService {
            public function fetchData() {
                return 'Data from old API';
            }
        }

        class UserController {
            private $apiService;

            public function __construct() {
                $this->apiService = new ApiService(); // Hard-coded dependency
            }

            public function getUserData() {
                return $this->apiService->fetchData();
            }
        }

        // After: Using Dependency Injection
        class UserController {
            private $apiService;

            public function __construct(ApiService $apiService) { // Dependency is injected
                $this->apiService = $apiService;
            }

            public function getUserData() {
                return $this->apiService->fetchData();
            }
        }

        // Dependency injection in action
        $apiService = new ApiService();
        $userController = new UserController($apiService);
        echo $userController->getUserData();

How to migrate to Dependency Injection from an older API?

Example Migration

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How to migrate to Dependency Injection from an older API?

Example Migration

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