Question

我有一个非常简单的应用程序，目前只包含两个类 - 这些是＆＃34; MainActivity.cs ＆＃34;和＆＃34; NewDate.cs ＆＃34;

MainActivity简单地挂钩按钮和editText控件，然后调用＆＃34; NewDate.NewTimer（）＆＃34; - 这只是开始一个.NET计时器实例。

Inside＆＃34; OnCreate＆＃34;我可以在用户单击按钮时成功设置EditText的值，但是，当计时器到期时，我调用

     SafeDate.MainActivity.SetTimerDoneText("Timer done!");

使用断点我可以确定应用程序正在运行＆＃34; SetTimerDoneText＆＃34;，但该行

 editTimerInfo.Text = Text;

不起作用。

任何帮助都会非常值得赞赏。

以下两个类：

MainActivity.cs

 public class MainActivity : Activity
{
    static EditText editTimerInfo;
    protected override void OnCreate(Bundle bundle)
    {
        base.OnCreate(bundle);

        // Set our view from the "main" layout resource
        SetContentView(Resource.Layout.Main);
        Button btnNewTimer = FindViewById<Button>(Resource.Id.newDate);
         editTimerInfo = FindViewById<EditText>(Resource.Id.editTimerInfo);
        btnNewTimer.Click += (sender, e) =>
        {
            // Translate user's alphanumeric phone number to numeric
            Core.NewDate.NewTimer();
           // editTimerInfo.Text = "Timer started!"; //this works
        };
    }

    public static void SetTimerDoneText(string Text)
    {
        //SetContentView(Resource.Layout.Main);//commented out - doesn't work
        //   EditText editTimerInfo = FindViewById<EditText>(Resource.Id.editTimerInfo); //commented out - doesn't work
        editTimerInfo.Text = Text;
    } 
}

NewDate.cs

public static class NewDate
{

    public static void NewTimer()
    {

        System.Timers.Timer aTimer = new System.Timers.Timer();
        aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);
        aTimer.Interval = 5000; //Miliseconds : 5000 = 1 second
        aTimer.Enabled = true;
    }

    // Specify what you want to happen when the Elapsed event is raised.
    private static void OnTimedEvent(object source, ElapsedEventArgs e)
    {
        SafeDate.MainActivity.SetTimerDoneText("Timer done!"); //Successfully enters the function in MainActivity.cs but won't set the EditText value
    }
}

Answer 1

从我看到的，你基本上是在尝试实现一个ViewModel模式。

由于您是初学者，这可能有点复杂，但是当您准备好时，请查看some tutorial

从现在开始，去寻找更简单的东西，并将你的逻辑放在你的活动中

btnNewTimer.Click += (sender, e) =>
{
    System.Timers.Timer aTimer = new System.Timers.Timer();
    aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);
    aTimer.Interval = 5000; //Miliseconds : 5000 = 1 sec
    aTimer.Enabled = true;
};

private void OnTimedEvent(object source, ElapsedEventArgs e)
{
    editTimerInfo.Text = "Timer done!"; //Successfully enters the function in MainActivity.cs but won't set the EditText value
}

我从未玩过Timers所以我不能保证它会起作用，但这已经比使用静态更好了。

检查这是否适合您

在OnCreate外部设置EditText.Text

1 个答案: