Xamarin.Android 使用Timer 并更改UI _android

不飞则已，一飞冲天；不鸣则已，一鸣惊人。这篇文章主要讲述Xamarin.Android 使用Timer 并更改UI相关的知识，希望能为你提供帮助。
【Xamarin.Android 使用Timer 并更改UI】http://blog.csdn.net/ozhangsan12345/article/details/72653070

第一步：创建timer对象

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//创建timer对象
Timer _dispatcherTimer;
//计数
int sec = 60;

第二步：实例化timer并给委托事件

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TimerCallback timerDelegate = new TimerCallback(Tick); //tick为执行防范
_dispatcherTimer = new Timer(timerDelegate, null, 0, 1000);

//执行方法
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public void Tick(object state)
{
this.RunOnUiThread(() =>
{
if (sec > 0)
{
smsbt.Text = sec.ToString() + "秒可重发";
sec--;
}
else
{
_dispatcherTimer.Dispose();
sec = 60;
smsbt.Text = "获取验证码";
}
});
}

//使用

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{
TimerCallback timerDelegate = new TimerCallback(Tick);
_dispatcherTimer = new Timer(timerDelegate, null, 0, 1000);
ProgressDialog progressDialog = ProgressDialog.Show(this, "", "请稍后...");
new Thread(new ThreadStart(() =>
{
string url = this.GetString(Resource.String.url) + "/AppServices/userServices.aspx?action=regSms";
using (var http = new HttpClient())
{
var content = new FormUrlEncodedContent(new Dictionary< string, string> () {
{ "phone",userphone.Text }
});
var response = http.PostAsync(url, content);
string me = response.Result.Content.ReadAsStringAsync().Result;
progressDialog.Dismiss();
this.RunOnUiThread(() =>
{
HandleResult(me);
});
}
})).Start();
}