Android – 使功能为false /不运行

我有两个按钮上的setOnClickListener ，它们只是在两个函数中运行代码。

我想创建一个安全的电话，所以当我点击按钮的应用程序不会崩溃。 我以为我不得不让他们虚假或什么，但显然这是行不通的。

我应该怎么做？

谢谢

  if (weightView.text.isEmpty() && percentageView.text.isEmpty()) { calculation() == false lbsCalculation() == false } else { calculation() lbsCalculation() } 

这些是我的两个clickListeners

 calculateBtn.setOnClickListener{ calculation() } lbsCalculationBtn.setOnClickListener{ lbsCalculation() } 

功能：

 fun calculation () { var weightValue = weightView.text.toString().toInt() var percentageValue = percentageView.text.toString().toInt() var result = (weightValue * percentageValue) / 100.toDouble() var resultFormat = "%.1f KG".format(result) resultView.text = resultFormat.toString() } fun lbsCalculation() { var weightValue = weightView.text.toString().toInt() var percentageValue = percentageView.text.toString().toInt() var result = ((weightValue * percentageValue) / 100) * 2.2.toDouble() var resultFormat = "%.1f LBS".format(result) resultView.text = resultFormat.toString() } 

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Answer 1

在你的方法里面做。 像这样的东西：

 public class calculation(String weightView, String percentageView){ //you make a condition that should do something if strings are empty if(weightView && percentageView == null) //DO WHAT YOU WANT }else{ //Show an alert or something that your EditText is empty. } 

应该像这样调用它：

 calculateBtn.setOnClickListener{ calculation(weightView.getText.toString(),percentageView.getText.toString()) } 

======编辑=======

你的功能应该是这样的：

 fun calculation(weightValue: String,percentageValue: String) { if(weightValue == null && percentageValue == null ){ var myWeightValue = weightValue.toInt(); var myPercentageValue = percentageValue.toInt(); var result = (myWeightValue * myPercentageValue) / 100 var resultFormat = "%.1f KG".format(result) resultView.text = resultFormat } else { **SHOW A MESSAGE LIKE A TOAST OR ALERTDIALOG TO LET THE USER KNOW THAT WEIGHT AND PERCENTAGE IS REQUIRED** } } fun lbsCalculation() { var weightValue = weightView.text.toString().toInt() var percentageValue = percentageView.text.toString().toInt() var result = ((weightValue * percentageValue) / 100) * 2.2 var resultFormat = "%.1f LBS".format(result) resultView.text = resultFormat } 

你的onClick应该是这样的：

 calculateBtn.setOnClickListener{ calculation(weightView.text,percentageView.text) }