Android alertdialog 如何在我从单选项目中选择项目后防止否定按钮确认操作

Question

目前，我已经使用 setSingleChoiceItems、setPositiveButton 和 setNegativeButton 在警报对话框中创建了更改语言。如果单击 setNegativeButton，如何防止语言更改？

private fun showChangeLanguageDialog() {

    val listItems = arrayOf(getString(R.string.english), getString(R.string.chinese))
    val mBuilder = AlertDialog.Builder(this@LoginActivity)
    mBuilder.setTitle(getString(R.string.choose_language))
    mBuilder.setCancelable(false)
    mBuilder.setSingleChoiceItems(listItems, -1) { dialogInterface, i ->

        when (i) {
            0 -> {
                setLocale("en")
            }
            1 -> {
                setLocale("zh")
            }

        }}.setPositiveButton(getString(R.string.button_ok)) { dialogInterface, i ->

            recreate()
            dialogInterface.dismiss()

        }.setNegativeButton(getString(R.string.button_no)) { dialogInterface, i -> }

    val mDialog = mBuilder.create()
    mDialog.show()
}

现在 setPositiveButton 工作正常，我将 setCancelable 设置为 false，那么如何实现 setNegativeButton？谢谢

Answer 1

这是因为您总是在选择以下代码中的每个项目时设置语言:

mBuilder.setSingleChoiceItems(listItems, -1) { dialogInterface, i ->

    when (i) {
        0 -> {
            setLocale("en")
        }
        1 -> {
            setLocale("zh")
        }

    }}

因此，只有在单击肯定按钮时才需要设置语言环境。这可以通过为您的语言环境使用临时变量来实现。像这样:

private fun showChangeLanguageDialog() {
    ...

    val temporaryLocale = ""

    mBuilder.setSingleChoiceItems(listItems, -1) { dialogInterface, i ->

        when (i) {
            0 -> {
                temporaryLocale = "en"
            }
            1 -> {
                temporaryLocale = "zh"
            }

        }}.setPositiveButton(getString(R.string.button_ok)) { dialogInterface, i ->

            setLocale(temporaryLocale)
            recreate()
            dialogInterface.dismiss()

        }.setNegativeButton(getString(R.string.button_no)) { dialogInterface, i -> }

    val mDialog = mBuilder.create()
    mDialog.show()
}

注意:代码尚未测试。