Best practice MVVM pass Data from one Activity to another

Best Practice MVVM: Passing Data from One Activity to Another

When working with the MVVM architectural pattern in Android development, it's crucial to consider how data is passed between different activities. Let's explore some best practices to ensure efficient and reliable data transfer.

1. Utilize Extras in Intents:

// In the source activity:
Intent intent = new Intent(this, DetailActivity.class);
intent.putExtra("data_key", data);
startActivity(intent);

// In the destination activity:
Intent intent = getIntent();
String data = intent.getStringExtra("data_key");

2. Leverage ViewModel with Saved Instance State:

// In the source activity:
DetailViewModel viewModel = ViewModelProviders.of(this).get(DetailViewModel.class);
viewModel.setData(data);

// In the destination activity:
DetailViewModel viewModel = ViewModelProviders.of(this).get(DetailViewModel.class);
String data = viewModel.getData();

3. Employ EventBus or RxJava:

Utilizing libraries like EventBus or RxJava enables communication between activities through event streams or observable sequences.

4. Handle Configuration Changes:

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putString("data_key", data);
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    String data = savedInstanceState.getString("data_key");
}

Conclusion:

By following these best practices, you can effectively pass data between activities in your MVVM applications. This approach enhances code maintainability, modularity, and testability.