【Android】6.3 ProgressDialog

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。

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent">

    <Button

        android:id="@+id/btnPprogress"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="条形进度条" />

    <Button

        android:id="@+id/btnCircle"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="圆形进度条" />

</LinearLayout>

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<Button>(Resource.Id.btnPprogress);

            btnProgress.Click += BtnProgress_Click;

            var btnCircle = FindViewById<Button>(Resource.Id.btnCircle);

            btnCircle.Click += BtnCircle_Click;

        }

        private void BtnProgress_Click(object sender, EventArgs e)

        {

            progress = ;

            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 = ;

            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 < )

                {

                    dialog.Progress = progress++;

                    if (showProgress)

                    {

                        RunOnUiThread(() =>

                        {

                            dialog.SetMessage("正在下载……" + progress + "%");

                        });

                    }

                    System.Threading.Thread.Sleep();

                }

                dialog.Cancel();

            });

        }

    }

}

运行。