英文:
How to do nothing if the same option is selected in an Android dialog?
问题
我有以下对话：
val alertDialog: AlertDialog.Builder = AlertDialog.Builder(context)
val options = arrayOf("红色", "蓝色", "绿色")
alertDialog.setTitle("选择颜色")
alertDialog.setSingleChoiceItems(options, 1) { dialog, position ->
logErrorMessage("位置: " + position)
dialog.dismiss()
}
val alert: AlertDialog = alertDialog.create()
alert.show()
默认选中的值是"蓝色"，因为我将1传递给setSingleChoiceItems。每当我点击三个选项中的一个时，都会打印出position。是否有一种方法可以只在选项更改时获取该日志语句？如果保持选定相同的选项，则不想要任何日志语句。谢谢。
英文:
I have the following dialog:
val alertDialog: AlertDialog.Builder = AlertDialog.Builder(context)
val options = arrayOf("Red", "Blue", "Green")
alertDialog.setTitle("Select a color")
alertDialog.setSingleChoiceItems(options, 1) { dialog, position ->
logErrorMessage("position: " + position)
dialog.dismiss()
}
val alert: AlertDialog = alertDialog.create()
alert.show()
The default selected value that is is "Blue", as I pass 1 to setSingleChoiceItems. Every time I click on one of the three options, I get the position printed. Is there any way I can get that log statement only if the option is changed? If the same option remains selected, then I want no log statement? Thanks
答案1
得分: 2
假设您不更改默认选择的值，只需进行条件检查，确保位置不等于1。如果更加动态，请存储当前位置并进行比较：
val alertDialog: AlertDialog.Builder = AlertDialog.Builder(context)
val options = arrayOf("红色", "蓝色", "绿色")
alertDialog.setTitle("选择颜色")
alertDialog.setSingleChoiceItems(options, 1) { dialog, position ->
if(position != 1) {
logErrorMessage("位置: " + position)
}
dialog.dismiss()
}
val alert: AlertDialog = alertDialog.create()
alert.show()
英文:
Assuming you don't change the default selected value, just do a conditional check that the position isn't equal to 1. If it's more dynamic, then store the current position and compare that instead:
val alertDialog: AlertDialog.Builder = AlertDialog.Builder(context)
val options = arrayOf("Red", "Blue", "Green")
alertDialog.setTitle("Select a color")
alertDialog.setSingleChoiceItems(options, 1) { dialog, position ->
if(position != 1) {
logErrorMessage("position: " + position)
}
dialog.dismiss()
}
val alert: AlertDialog = alertDialog.create()
alert.show()
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