如何在使用ViewModelProvider时从TextField获取文本值？

// MyViewModel.java
public class MyViewModel extends ViewModel {
    private MutableLiveData<String> textValue = new MutableLiveData<>();

    public void setTextValue(String value) {
        textValue.setValue(value);
    }

    public LiveData<String> getTextValue() {
        return textValue;
    }
}

// MainActivity.java
public class MainActivity extends AppCompatActivity {
    private MyViewModel viewModel;

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

        viewModel = new ViewModelProvider(this).get(MyViewModel.class);

        final EditText textField = findViewById(R.id.text_field);
        textField.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                viewModel.setTextValue(s.toString());
            }

            @Override
            public void afterTextChanged(Editable s) {
            }
        });

        viewModel.getTextValue().observe(this, new Observer<String>() {
            @Override
            public void onChanged(String value) {
                // 在这里处理文本值的变化
            }
        });
    }
}