Question

我在两个按钮上有setOnClickListener只能在两个函数中运行代码。

我想创建一个安全的呼叫，所以当我点击按钮时，应用程序不会崩溃。我以为我必须把它们弄错或者其他东西，但显然它不起作用。

我该怎么做？

由于

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

这是我的两个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()

    }

=================

Picture

Answer 1

在您的方法中执行此操作。这样的事情：

public class ChangeCell{

public ChangeCell(){
  try
  {
    File file = new File("C:\\ENTWICKLUNG\\testfolder\\out\\test.xlsx");
    FileInputStream fis = new FileInputStream(file);
    XSSFWorkbook wb = new XSSFWorkbook(fis);
    XSSFWorkbook newWb = new XSSFWorkbook();
    XSSFCell oldCell = wb.getSheetAt(0).getRow(0).getCell(0);

    XSSFSheet newSheet = newWb.createSheet("Test");
    XSSFRow newRow = newSheet.createRow(0);
    XSSFCell newCell = newRow.createCell(0);
    newCell.setCellValue("TestForCell");

    XSSFCellStyle newCellStyle = newWb.createCellStyle();

    cellChange(oldCell, newCell, newCellStyle);
    newWb.write(new FileOutputstream("newTest.xlsx");
    newWb.close();     
  }
  //.. catch omitted
}

private void cellChange(Cell cell, XSSFCell newCell, XSSFCellStyle newCellStyle)
{
  try
  {

    XSSFCell tt = (XSSFCell) cell;
    XSSFColor color = tt.getCellStyle().getFillForegroundColorColor();
    newCellStyle.setFillForegroundColor(color);
    newCellStyle.setFillPattern(CellStyle.SOLID_FOREGROUND);
    newCell.setCellStyle(newCellStyle);

  }
  //.. catch omitted
}  }

并且应该像这样调用它：

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.
}

<强> == EDIT =======

您的功能应如下所示：

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

你的onClick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

    }

Android - 使函数false /不运行

1 个答案: