在android中使用数据绑定保留编辑文本光标位置

<EditText
    android:id="@+id/editText"
    android:text="@={viewModel.text}"
    ...
/>

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

    public MutableLiveData<String> getText() {
        return text;
    }

    public void setText(String newText) {
        text.setValue(newText);
    }
}

public class MainActivity extends AppCompatActivity {
    private MyViewModel viewModel;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // 创建ViewModel实例
        viewModel = new ViewModelProvider(this).get(MyViewModel.class);

        // 设置布局文件
        ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
        binding.setViewModel(viewModel);
        binding.setLifecycleOwner(this);
    }
}

editText.addTextChangedListener(new TextWatcher() {
    private int cursorPosition;

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        // 保存光标位置
        cursorPosition = editText.getSelectionStart();
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        // 更新ViewModel中的文本
        viewModel.setText(s.toString());
    }

    @Override
    public void afterTextChanged(Editable s) {
        // 恢复光标位置
        editText.setSelection(cursorPosition);
    }
});