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Passing Objects Between Activities in Android: A Comprehensive Guide

Passing data between activities is a fundamental task in Android development. While simple data types like strings, integers, and booleans can be easily passed using `Intent` extras, transferring complex objects requires a different approach. This tutorial explores several methods for passing objects between activities, covering the advantages and disadvantages of each, along with detailed code examples.

*Methods for Passing Objects Between Activities:*

1. *Using `Serializable` Interface:*
2. *Using `Parcelable` Interface:*
3. *Passing Object References (Not Recommended in Most Cases):*
4. *Using a Singleton Pattern (for global state):*
5. *Using a Dependency Injection Framework (like Hilt/Dagger):*
6. *Using a ViewModel with shared state (Modern approach):*

*Let's explore each method in detail:*

*1. Using the `Serializable` Interface*

*Concept:* `Serializable` is a built-in Java interface that allows you to convert an object into a byte stream for storage or transmission. When passing an object using `Serializable`, the system serializes the object in the first activity and deserializes it in the second activity.

*Implementation:*

*Step 1: Implement the `Serializable` Interface:* Make your data class implement the `Serializable` interface. This interface doesn't require you to implement any methods.



*Step 2: Sending the Object:* In the sending activity, create an `Intent`, put the `User` object as an extra using `putExtra()`, and start the next activity.



*Step 3: Receiving the Object:* In the receiving activity, retrieve the `User` object from the `Intent` using `getSerializableExtra()`.



*Advantages:*

Simple to implement.
Requires minimal code changes to your data classes.

*Disadvantages:*

*Performance:* Serialization and deserialization are relatively slow o ...

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