How to migrate to ViewModel from an older API?

As Android development evolves, migrating to ViewModel from older APIs offers a cleaner architecture by separating UI-related data from the Activity/Fragment lifecycle. This ensures that data survives configuration changes like screen rotations, providing a smoother user experience.

Migration Steps

Identify the existing data source currently managed in your Activity/Fragment.
Create a ViewModel class that will hold the data.
Update the Activity/Fragment to use the ViewModel.
Implement LiveData to observe data changes.

Example


    // ViewModel Class
    public class MyViewModel extends ViewModel {
        private MutableLiveData data;

        public LiveData getData() {
            if (data == null) {
                data = new MutableLiveData<>();
                loadData();
            }
            return data;
        }

        private void loadData() {
            // Load data here
            data.setValue("Hello, ViewModel!");
        }
    }

    // In your Activity/Fragment
    public class MyActivity extends AppCompatActivity {
        private MyViewModel viewModel;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_my);

            viewModel = new ViewModelProvider(this).get(MyViewModel.class);
            viewModel.getData().observe(this, newData -> {
                // Update UI with new data
                textView.setText(newData);
            });
        }
    }

ViewModel Android LiveData MVVM architecture migration AndroidX

How to migrate to ViewModel from an older API?

Migration Steps

Example

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How to migrate to ViewModel from an older API?

Migration Steps

Example

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