如何在使用viewmodel旋转设备时保留edittext数据？

public class MyViewModel extends ViewModel {
    private MutableLiveData<String> editTextData = new MutableLiveData<>();

    public void setEditTextData(String data) {
        editTextData.setValue(data);
    }

    public LiveData<String> getEditTextData() {
        return editTextData;
    }
}

public class MyActivity extends AppCompatActivity {
    private MyViewModel viewModel;
    private EditText editText;

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

        viewModel = new ViewModelProvider(this).get(MyViewModel.class);
        editText = findViewById(R.id.editText);

        viewModel.getEditTextData().observe(this, new Observer<String>() {
            @Override
            public void onChanged(String data) {
                editText.setText(data);
            }
        });
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        viewModel.setEditTextData(editText.getText().toString());
    }
}