What do you consider to be the shortcomings in the code that you immediately want to fix?

Incorrect naming style for variables and functions.

Violation of SOLID principles.

Code duplication (DRY - Don't Repeat Yourself).

Excessive nesting of loops and conditional statements.

Use of "magic" numbers instead of constants.

Lack or incomplete use of comments for complex sections.

Ignoring error (exception) handling.

Use of outdated APIs or approaches.

Lack of tests for critically important functionality.

Large, monolithic classes or methods.

Ignoring performance (e.g., creating a large number of temporary objects in loops).

Direct use of Android Context where not required (context leaks).

Incorrect handling of threads (performing long operations on the main thread).

Lack of separation of responsibilities between architecture components (e.g., business logic in Activity/Fragment).

Ignoring the use of Dependency Injection.