Kotlin -如何设置共享首选项代码，以便打开已关闭的应用程序，它将在我离开的位置打开上一个活动

implementation 'androidx.preference:preference-ktx:1.1.1'

val sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this)

override fun onPause() {
    super.onPause()
    val editor = sharedPreferences.edit()
    editor.putInt("lastActivityPosition", currentPosition)
    editor.apply()
}

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

    val lastActivityPosition = sharedPreferences.getInt("lastActivityPosition", -1)
    if (lastActivityPosition != -1) {
        // 根据需要打开相应的活动
        when (lastActivityPosition) {
            1 -> startActivity(Intent(this, Activity1::class.java))
            2 -> startActivity(Intent(this, Activity2::class.java))
            // 其他活动...
        }
    }
}