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为什么即使启动了事件处理程序并创建了button_click方法,单击按钮后仍没有结果?

xamarin.android xamarin xml c#

r_each · 技术社区 · 2 年前

我在安卓系统(Xamarin)中进行的一个练习项目遇到了问题。这是一个年度收入侧项目,我只需要一个“计算”按钮。下面是连接xml代码中的数据点的方法代码,它有calculateButton。单击事件处理程序。

下一段代码是点击方法本身,它应该返回用户输入的项目。我还将包括EditText和TextView变量。

因此,为了提供更多关于发生了什么的细节,我运行了Android模拟器,在4个编辑框中键入数字,点击计算(按钮),5个文本视图旁边不会弹出任何结果。有人看到这里有什么问题吗?我没有任何错误,所以现在我头疼。

旁注,我原来是计算按钮的。单击+=CalculateButton_Click;此外,这是在MainActivity.cs lol中

EditText incomePerHourEditText;
EditText workHoursEditText;
EditText taxRateEditText;
EditText savingsRateEditText;

TextView workSummaryTitle;
TextView annualIncomeTitle;
TextView annualTaxTitle;
TextView annualSavingsTitle;
TextView spendableIncomeTitle;

Button calculateButton;
RelativeLayout resultLayout;

protected override void OnCreate(Bundle savedInstanceState)
{
    base.OnCreate(savedInstanceState);
    
    // Set our view from the "main" layout resource
    SetContentView(Resource.Layout.activity_main);
}

void ConnectViews()
{
    incomePerHourEditText = FindViewById<EditText>(Resource.Id.incomePerHourEditText);
    workHoursEditText = FindViewById<EditText>(Resource.Id.workHoursEditText);
    taxRateEditText = FindViewById<EditText>(Resource.Id.taxRateEditText);
    savingsRateEditText = FindViewById<EditText>(Resource.Id.savingsRateEditText);

    workSummaryTitle = FindViewById<TextView>(Resource.Id.workSummaryTitle);
    annualIncomeTitle = FindViewById<TextView>(Resource.Id.annualIncomeTitle);
    annualTaxTitle = FindViewById<TextView>(Resource.Id.annualTaxTitle);
    annualSavingsTitle = FindViewById<TextView>(Resource.Id.annualSavingsTitle);
    spendableIncomeTitle = FindViewById<TextView>(Resource.Id.spendableIncomeTitle);

    calculateButton = FindViewById<Button>(Resource.Id.calculateButton);
    resultLayout = FindViewById<RelativeLayout>(Resource.Id.resultLayout);

    calculateButton.Click += new EventHandler(CalculateButton_Click);

}

protected void CalculateButton_Click(object sender, System.EventArgs e)
{
    //Take inputs from user
    double incomePerHour = double.Parse(incomePerHourEditText.Text);
    double workHourPerDay = double.Parse(workHoursEditText.Text);
    double taxRate = double.Parse(taxRateEditText.Text);
    double savingsRate = double.Parse(savingsRateEditText.Text);

    double annualWorkHoursSummary = workHourPerDay * 5 * 50; //50 because most get 2 weeks off
    double annualIncome = incomePerHour * workHourPerDay * 5 * 50;
    double taxPayable = (taxRate / 100) * annualIncome;
    double annualSavings = (savingsRate / 100) * annualIncome;
    double spendableIncome = annualIncome - annualSavings - taxPayable;

    //Display results of the calculations
    workSummaryTitle.Text = annualWorkHoursSummary.ToString()+" Hrs";
    annualIncomeTitle.Text = annualIncome.ToString()+ " USD";
    annualTaxTitle.Text = taxPayable.ToString() + " USD";
    annualSavingsTitle.Text = annualSavings.ToString() + " USD";
    spendableIncomeTitle.Text = spendableIncome.ToString() + " USD";

    //display the Resultlayout from invisible to visible
}

这是我期待的结果。但是,这些数字不会显示在年度____旁边的右下角。帮助

1 回复 | 直到 2 年前

Cybrosys 2 年前

您没有调用ConnectViews方法。更改此项:

protected override void OnCreate(Bundle savedInstanceState)
{
    base.OnCreate(savedInstanceState);
    
    // Set our view from the "main" layout resource
    SetContentView(Resource.Layout.activity_main);
}

对此:

protected override void OnCreate(Bundle savedInstanceState)
{
    base.OnCreate(savedInstanceState);
    
    // Set our view from the "main" layout resource
    SetContentView(Resource.Layout.activity_main);

    ConnectViews();
}