android-studio - 将数组列表的值保存到微调器

Question

我的应用程序中有一个微调器，我想保存数组列表的状态，因此如果用户选择一个选项并关闭应用程序，我希望微调器在用户重新打开我的应用程序时保存它的值。

我的主要活动：

        t1.typeface = Typeface.createFromAsset(assets, "andlso.ttf")
        val fonts = arrayOf("الخط الديواني", "الخط الأندلسي")

        spinner.adapter = ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, fonts)
        spinner.onItemSelectedListener = object :AdapterView.OnItemSelectedListener {


            override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {

                val SelectedItem = parent!!.getItemAtPosition(position).toString()

                val sharedPreferences = getSharedPreferences("savefile", Context.MODE_PRIVATE)
                val editor = sharedPreferences.edit()
                editor.putString("savefile", fonts.toString())
                editor.apply()

                if (SelectedItem == "الخط الديواني"){
                        t.typeface = Typeface.createFromAsset(assets, "andlso.ttf")
                }else if (SelectedItem == "الخط الأندلسي"){
                        t.typeface = Typeface.createFromAsset(assets, "frsspbl.TTF") 
                }

Answer 1

只需在您的 mainActivity 中编写以下代码，

        val preferences = applicationContext.getSharedPreferences("MyPrefs", Context.MODE_PRIVATE)
        val prefEditor = preferences.edit()

        val fonts = arrayOf("Data1", "Data2", "Data3", "Data4")
        var adapterCountry = ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, fonts)

        val spinner = findViewById<Spinner>(R.id.spinner)
        spinner.adapter = adapterCountry;
        spinner.setSelection(preferences.getInt("position", 0))

        spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
            override fun onItemSelected(parent: AdapterView<*>, view: View, position: Int, id: Long) {
                spinner.setSelection(position)
                prefEditor.putInt("position", position)
                prefEditor.apply()
            }

            override fun onNothingSelected(parent: AdapterView<*>) {
            }
        }

这将完成你的工作。我希望这对你有帮助。