Android Kotlin SharedPreferences保存错误

Question

我在将数据正确保存到SharedPreferences中时遇到问题。不知何故，最后一个editor.putstring方法被写入了我所有的首选项中，我不知道为什么。

class MainActivity : AppCompatActivity() {

private var firstnameEditText : EditText ? = null
private var lastnameEditText : EditText ?  = null
private var firstnameTextView : TextView ? = null
private var lastnameTextView : TextView ? = null
private var saveButton : Button? = null

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    firstnameEditText = findViewById(R.id.main_activity_firstname_editText) as EditText
    lastnameEditText = findViewById(R.id.main_activity_lastname_editText) as EditText
    firstnameTextView = findViewById(R.id.main_activity_firstname_textView) as TextView
    lastnameTextView = findViewById(R.id.main_activity_lastname_textView) as TextView
    saveButton = findViewById(R.id.main_activity_save_button) as Button
    saveButton?.setOnClickListener { saveData() }
    loadData()
}

private fun loadData(){
    try {
        val sharedPref = getSharedPreferences( getString(R.string.sharedPrefs) , Context.MODE_PRIVATE) ?: return
        val firstname = sharedPref.getString(getString(R.string.firstname_key), "")
        val lastname = sharedPref.getString(getString(R.string.lastname_key), "")
        firstnameTextView?.text = firstname
        lastnameTextView?.text = lastname
    } catch (ex : Exception){
        Log.d("Main", ex.toString())
    }
}

private fun saveData(){
    try {
        val sharedPref = getSharedPreferences( getString(R.string.sharedPrefs) , Context.MODE_PRIVATE) ?: return
        with(sharedPref.edit()){
            putString(getString(R.string.firstname_key), firstnameEditText?.text.toString())
            putString(getString(R.string.lastname_key), lastnameEditText?.text.toString())
            apply()
        }
        loadData()
    } catch (ex : Exception){
        Log.d("Main", ex.toString())
    }
}

根据官方文件，我做的一切都是对的。在此处输入链接描述

如有任何帮助，不胜感激。提前谢了。

Answer 1

我发现r.string.firstname_key和r.string.lastname_key的值相同。

可以在strings.xml中检查这些值吗