使用SharedPreferences来保留数据。

示例代码：

//在创建ViewModel时实例化SharedPreferences class MyViewModel(private val context: Context) : ViewModel() {

private val prefs = context.getSharedPreferences("MyPrefs", Context.MODE_PRIVATE)

private val _myData = MutableLiveData()
val myData: LiveData = _myData

//保存数据到SharedPreferences
fun saveData(data: String) {
    prefs.edit().putString("myData", data).apply()
}

//从SharedPreferences获取数据
fun loadData() {
    _myData.value = prefs.getString("myData", "")
}

}

//在Activity或Fragment中使用ViewModel来保存和获取数据 class MyActivity : AppCompatActivity() {

private val viewModel by viewModels()

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)

    //从SharedPreferences获取数据
    viewModel.loadData()

    //保存数据到SharedPreferences
    viewModel.saveData("Hello World")
}

}