分类：C#、Android、VS2015；

创建日期：2016-02-08

一、简介

进度条对话框（ProgressDialog）常用于不能在短时间内快速完成的操作，显示进度条的目的是为了让用户明白程序正在处理的进度，避免用户感觉莫名其妙。

本示例演示了两种进度条的基本用法：条形进度条和圆形进度条。

二、示例==Demo03ProgressDialog

1、运行截图

 

2、添加Demo03_ProgressDialog.axml文件

在layout文件夹下添加该文件。

3、添加Demo03ProgressDialog.cs文件

在SrcActivity文件夹下添加该文件。

using System;using Android.App;using Android.OS;using Android.Widget;namespace ch06demos.SrcActivity{    [Activity(Label = "Demo03ProgressDialog")]    public class Demo03ProgressDialog : Activity    {        private int progress;        private ProgressDialog dialog;        protected override void OnCreate(Bundle bundle)        {            base.OnCreate(bundle);            SetContentView(Resource.Layout.Demo03_ProgressDialog);            var btnProgress = FindViewById(Resource.Id.btnPprogress);            btnProgress.Click += BtnProgress_Click;            var btnCircle = FindViewById(Resource.Id.btnCircle);            btnCircle.Click += BtnCircle_Click;        }        private void BtnProgress_Click(object sender, EventArgs e)        {            progress = 0;            dialog = new ProgressDialog(this)            {                Progress = progress,                Indeterminate = false,            };            dialog.SetProgressStyle(ProgressDialogStyle.Horizontal);            dialog.SetTitle("条形进度条示例");            dialog.SetMessage("正在下载……");            dialog.SetIcon(Resource.Drawable.Icon);            dialog.SetCancelable(true);            dialog.SetButton("取消", delegate            {                Toast.MakeText(this, "已取消下载！", ToastLength.Long).Show();            });            dialog.Show();            RunTask(showProgress: false);        }        private void BtnCircle_Click(object sender, EventArgs e)        {            progress = 0;            dialog = new ProgressDialog(this)            {                Progress = progress,                Indeterminate = false            };            dialog.SetProgressStyle(ProgressDialogStyle.Spinner);            dialog.SetTitle("环转圆形进度条示例");            dialog.SetMessage("正在下载……");            dialog.SetIcon(Resource.Drawable.Icon);            dialog.SetCancelable(true);            dialog.SetButton("取消", delegate            {                Toast.MakeText(this, "已取消下载！", ToastLength.Long).Show();            });            dialog.Show();            RunTask(showProgress: true);        }        //模拟长时间执行的任务        private void RunTask(bool showProgress)        {            System.Threading.Tasks.Task.Run(() =>            {                while (progress < 100)                {                    dialog.Progress = progress++;                    if (showProgress)                    {                        RunOnUiThread(() =>                        {                            dialog.SetMessage("正在下载……" + progress + "%");                        });                    }                    System.Threading.Thread.Sleep(100);                }                dialog.Cancel();            });        }    }}

运行。