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A beginner-friendly guide on how to pass data between activities in Android Studio using Java. Learn how to use Intent and other methods to achieve seamless data flow.
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This video is based on the question https://stackoverflow.com/q/71398122/ asked by the user 'MMS' ( https://stackoverflow.com/u/18410262/ ) and on the answer https://stackoverflow.com/a/71403016/ provided by the user 'Givver' ( https://stackoverflow.com/u/1704106/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Pass Information Between Activities in Android Studio using Java

Creating an engaging app often requires passing data between different activities. If you’re a beginner in Android Studio and are unsure how to relay information from your main activity to another activity, don’t worry! This post will walk you through the necessary steps to achieve that in a clear and concise manner.

The Scenario: Passing Data to the Results Activity

You are currently developing an app that lets users select different charities based on a radio button selection. After the user makes a selection, you want to check a MongoDB Realm database for the corresponding charities and then display them in a new activity (ResultsActivity). Here’s how to do it step-by-step.

Step 1: Capture User Input

You are already on the right track with your radio button setup in the MainActivity. Ensure you've set up the OnClickListener for the submit button to handle the radio button input as shown in your existing code:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Prepare the Data for the Next Activity

Next, you need to initiate the Intent to transition to the ResultsActivity. You can pass the charity data that you fetched based on the selected radio button using the following method:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Retrieve Data in Results Activity

In your ResultsActivity, you will need to extract the data you just passed through the Intent. This is handled in the onCreate method:

[[See Video to Reveal this Text or Code Snippet]]

Additional Considerations

Data Types: Besides Strings, you can pass various data types such as integers, floats, etc. Use the corresponding methods like getIntExtra() to retrieve data of different types.

Complex Data Structures: If you need to pass complex objects, you can implement the Serializable interface for your object model.

ViewModel Approach: For more advanced applications, consider using a ViewModel to manage UI-related data lifecycle-consciously, especially if you might need to pass data between fragments and activities.

Conclusion

Passing data between activities is a fundamental skill in Android development, especially when creating interactive applications. By following the steps outlined above, you can allow seamless data flow from your main activity to any other activity in your app. As you continue to work in Android Studio, you'll find that mastering Intents and how to handle them will significantly improve your app's functionality.

With this guide, you should feel more equipped to manage data transitions effectively. Happy coding!