Arrays 在Andoird Studio/Kotlin进行抽认卡测试/记忆

抱歉发了这么长的帖子！我正在试着制作一张记忆卡片，我已经坚持了一个星期了

这是数组

val sentenceArray = arrayOfNulls<String>(8)
    sentenceArray[0] = ""
    sentenceArray[1] = "Array 1 (1)"
    sentenceArray[2] = "Array 2 (2)"
    sentenceArray[3] = "Array 3 (3)"
    sentenceArray[4] = "Array 4 (4)"
    sentenceArray[5] = "Array 5 (5)"

这个密码呢

if (firstSentence < lastSentence)
                                    {
                                        textView.setOnClickListener {
                                            textView.text = sentenceArray[firstSentence]?.takeLast(3)
                                        }
                                    }

if（第一句<最后一句）
{
textView.setOnClickListener{
textView.text=句子数组[第一句]？.takeLast（3）
}
}

这两个代码导致该流
（1）
数组1
数组2
（2）

---

当它应该继续时完成（3）

您实际上不需要循环，因为循环是由用户单击文本视图处理的，在您的情况下，if条件就足够了

我观察到的另一件事是，您正在其他侦听器中设置单击侦听器和微调器侦听器。这不是必需的，并且使您的代码不可读且解析复杂，请注意，在您的情况下，您可以在同一级别上定义所有侦听器来实现您想要的，您不必嵌套它们

你可以做如下的事情。我已经取消了嵌套侦听器配置

   class Temp {

    lateinit var leftSpinner: Spinner
    lateinit var rightSpinner: Spinner
    lateinit var buttonStart: Button
    lateinit var sentenceArray: Array<String>
    lateinit var textView: TextView
    var selectedLeftSpinner = -1
    var selectedRightSpinner = -1

   private fun setup() {

        /** Define left spinner item selected listener, capture the selected position */
        leftSpinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
            override fun onNothingSelected(parent: AdapterView<*>?) {}
            override fun onItemSelected(
                parent: AdapterView<*>?, view: View?,
                position: Int, id: Long) {
                selectedLeftSpinner = position
            }
        }

        /** Define right spinner item selected listener, capture the selected position */
        rightSpinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
            override fun onNothingSelected(parent: AdapterView<*>?) {}
            override fun onItemSelected(
                parent: AdapterView<*>?, view: View?,
                position: Int, id: Long) {
                selectedRightSpinner = position
            }
        }

        /** Define button start click listener, show text if left spinner is selected. */
        buttonStart.setOnClickListener {
            /** only set text if left spinner is selecte */
            if(selectedLeftSpinner != -1){
                textView.text = sentenceArray[selectedLeftSpinner]?.takeLast(3)
            }
        }

/** Handle edge cases, such as what happens if spinner is not selected */
    textView.setOnClickListener {
        /** if currently selected item's last 3 chars are being shown,
         *  then show the answer.
         */
        if(textView.text == sentenceArray[selectedLeftSpinner]?.takeLast(3)){
            textView.text = sentenceArray[selectedLeftSpinner]
        }
        /** if answer is being shown then show last three chars of next item */
        else if(selectedLeftSpinner < selectedRightSpinner){
            selectedLeftSpinner++
            textView.text = sentenceArray[selectedLeftSpinner]?.takeLast(3)
        }
        /** else we have reached the last item */
        else{
            buttonStart.text = "DONE"
            /** reset left spinner to not selected state */
            selectedLeftSpinner = -1
        }
    }

    }
}

class-Temp{
lateinit变量leftSpinner:微调器
lateinit var rightSpinner:微调器
lateinit var按钮启动：按钮
lateinit var语句数组：数组
lateinit var textView:textView
var selectedLeftSpinner=-1
var selectedRightSpinner=-1
私人娱乐设置（）{
/**定义左微调器项选定侦听器，捕获选定位置*/
leftSpinner.onItemSelectedListener=对象：AdapterView.onItemSelectedListener{
覆盖未选择的乐趣（父项：AdapterView？{}
已选择“覆盖”选项(
父项：AdapterView？，视图：view？，
位置：Int，id:Long）{
selectedLeftSpinner=位置
}
}
/**定义右微调器项选定侦听器，捕获选定位置*/
rightSpinner.onItemSelectedListener=对象：AdapterView.onItemSelectedListener{
覆盖未选择的乐趣（父项：AdapterView？{}
已选择“覆盖”选项(
父项：AdapterView？，视图：view？，
位置：Int，id:Long）{
selectedRightSpinner=位置
}
}
/**定义按钮开始单击侦听器，如果选择了左微调器，则显示文本*/
buttonStart.setOnClickListener{
/**仅当选择左微调器时设置文本*/
如果（已选择左微调器！=-1）{
textView.text=sentenceArray[selectedLeftSpinner]？.takeLast（3）
}
}
/**处理边缘情况，如未选择微调器时发生的情况*/
textView.setOnClickListener{
/**如果显示当前选定项目的最后3个字符，
*然后给出答案。
*/
if（textView.text==sentenceArray[selectedLeftSpinner]？.takeLast（3））{
textView.text=sentenceArray[selectedLeftSpinner]
}
/**如果显示答案，则显示下一项的最后三个字符*/
else if（selectedLeftSpinner

---

这应该是可行的，但我没有考虑任何边缘情况，因此您必须处理它们，并且还有其他改进的空间，例如使用键、值结构（ex-map）存储闪存卡问题和答案。由于微调器的两个侦听器相同，代码仍然可以减少，我把它留作练习。

textView.setOnClickListener下的if语句修复了这个问题！我是Kotlin的新手，一直想知道如何避免所有那些您也帮助过的嵌套命令！非常感谢！

textView.setOnClickListener {
                                        if (textView.text == sentenceArray[firstSentence])
                                        textView.text = sentenceArray[firstSentence]?.takeLast(3)
                                    }

if (firstSentence < lastSentence)
                                    {
                                        textView.setOnClickListener {
                                            textView.text = sentenceArray[firstSentence]?.takeLast(3)
                                        }
                                    }

   class Temp {

    lateinit var leftSpinner: Spinner
    lateinit var rightSpinner: Spinner
    lateinit var buttonStart: Button
    lateinit var sentenceArray: Array<String>
    lateinit var textView: TextView
    var selectedLeftSpinner = -1
    var selectedRightSpinner = -1

   private fun setup() {

        /** Define left spinner item selected listener, capture the selected position */
        leftSpinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
            override fun onNothingSelected(parent: AdapterView<*>?) {}
            override fun onItemSelected(
                parent: AdapterView<*>?, view: View?,
                position: Int, id: Long) {
                selectedLeftSpinner = position
            }
        }

        /** Define right spinner item selected listener, capture the selected position */
        rightSpinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
            override fun onNothingSelected(parent: AdapterView<*>?) {}
            override fun onItemSelected(
                parent: AdapterView<*>?, view: View?,
                position: Int, id: Long) {
                selectedRightSpinner = position
            }
        }

        /** Define button start click listener, show text if left spinner is selected. */
        buttonStart.setOnClickListener {
            /** only set text if left spinner is selecte */
            if(selectedLeftSpinner != -1){
                textView.text = sentenceArray[selectedLeftSpinner]?.takeLast(3)
            }
        }

/** Handle edge cases, such as what happens if spinner is not selected */
    textView.setOnClickListener {
        /** if currently selected item's last 3 chars are being shown,
         *  then show the answer.
         */
        if(textView.text == sentenceArray[selectedLeftSpinner]?.takeLast(3)){
            textView.text = sentenceArray[selectedLeftSpinner]
        }
        /** if answer is being shown then show last three chars of next item */
        else if(selectedLeftSpinner < selectedRightSpinner){
            selectedLeftSpinner++
            textView.text = sentenceArray[selectedLeftSpinner]?.takeLast(3)
        }
        /** else we have reached the last item */
        else{
            buttonStart.text = "DONE"
            /** reset left spinner to not selected state */
            selectedLeftSpinner = -1
        }
    }

    }
}