应用mvvmlight for win8 让GridViewIte...- Wax框架简要教程(2)安装

当前位置: 编程技术>移动开发

本页文章导读:

▪应用mvvmlight for win8 让GridViewItem项实现动态命令导航使用mvvmlight for win8 让GridViewItem项实现动态命令导航前言：该技术前提是已经掌握一定程度的mvvmlight for win8 技巧实现思路：通过Messenger 机制动态发送导.........

▪ Wax框架简要教程(2)安装 Wax框架简明教程(2)安装一、安装Wax 当前，我们推荐你使用Xcode3创建Wax项目。Xcode4的项目模板仍然有些问题，因此请使用Xcode3。1. 从http://github.com/probablycorey/wax/下载Wax或者用git命令将它复制.........

▪ 异步加载数据的三种兑现异步加载数据的三种实现package com.testasyntextview; /** * 把获取的线程写到方法中(比较好) */ import android.app.Activity; import android.app.ProgressDialog; import android.content.Context; import android.os.Bundle; import and.........

[1]应用mvvmlight for win8 让GridViewItem项实现动态命令导航

来源: 互联网发布时间: 2014-02-18

使用mvvmlight for win8 让GridViewItem项实现动态命令导航

前言：

该技术前提是已经掌握一定程度的mvvmlight for win8 技巧

实现思路：

通过Messenger 机制动态发送导航参数到需要导航的page 完成导航

导航参数：

public class NavigateParameter
    {
        private string pageType;

        public string PageType
        {
            get { return pageType; }
            set { pageType = value; }
        }

        private object parameter;

        public object Parameter
        {
            get { return parameter; }
            set { parameter = value; }
        }
    }

在 OnNavigated 到首页的地方加入以下方法注册该处理通道

 protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);
            this.prContent.IsIndeterminate = true;
            this.ContentFrame.Navigate(typeof(MainPage));
            this.TopFrame.Navigate(typeof(VideosPage));

            #region Messengers  消息处理中心
            Messenger.Default.Register<NavigateParameter>(this, "MenuNavigate", async s =>
            {
                var type = await Task.Run<Type>(() =>
                {
                    var fullName = "IntTourism.View." + s.PageType;
                    return Type.GetType(fullName);
                });
                if (null != s.Parameter)
                    await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.High, () =>
                    this.ContentFrame.Navigate(type, s.Parameter));
                else
                    await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.High, () =>
                    this.ContentFrame.Navigate(type));
            });

            Messenger.Default.Register<NavigateParameter>(this, "TopFrameNavigate", async s =>
            {
                var type = await Task.Run<Type>(() =>
                {
                    var fullName = "IntTourism.View." + s.PageType;
                    return Type.GetType(fullName);
                });
                await this.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.High, () =>
                {
                    if (!TopFrame.CurrentSourcePageType.Equals(type))
                        if (null != s.Parameter)
                            this.TopFrame.Navigate(type, s.Parameter);
                        else
                            this.TopFrame.Navigate(type);
                });
            });

            #endregion
        }

Unloaded 注销

 private void LayoutAwarePage_Unloaded(object sender, RoutedEventArgs e)
        {
            Messenger.Default.Unregister<NavigateParameter>(this, "MenuNavigate");
            Messenger.Default.Unregister<LogBean>(this, "LogError");
            Messenger.Default.Unregister<LogBean>(this, "TopBusy");
            Messenger.Default.Unregister<LogBean>(this, "ContentBusy");
            Messenger.Default.Unregister<LogBean>(this, "TopFrame");
            this.btnCancel.PointerPressed -= SendError;
            this.btnSend.PointerPressed -= SendError;
        }

以下为xaml 里 gridview 菜单的binding方式

注意：ItemClick 此处通过eventTocommand 将事件与 viewmodel中相应的命令进行了binding处理请结合我上一篇文章对EventTocomand这一概念进行理解

<common:LayoutAwarePage x:
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
      xmlns:i="using:IntTourism.Com.Transvalue.Tools"
      xmlns:ignore="http://www.ignore.com"
      xmlns:common="using:IntTourism.Common"
      xmlns:cmd="using:IntTourism"
      mc:Ignorable="d ignore"
      d:DesignHeight="1080"
      d:DesignWidth="1080"
      DataContext="{Binding Main, Source={StaticResource Locator}}"
      NavigationCacheMode="Required">
    <Viewbox>
        <Grid Width="1080" Height="1080" x:Name="root">
            <GridView HorizontalAlignment="Left"                   
                      VerticalAlignment="Top"                  
                      Width="1080"                   
                      Height="1080"                  
                      CanDragItems="false" 
                      IsRightTapEnabled="False"                  
                      ScrollViewer.HorizontalScrollBarVisibility="Hidden"
                      IsSwipeEnabled="False"
                      x:Name="gv"
                      ItemsSource="{Binding MenuItems}"
                      SelectionMode="None"
                  >
                <GridView.Transitions>
                    <TransitionCollection>
                        <EntranceThemeTransition/>
                    </TransitionCollection>
                </GridView.Transitions>
                <GridView.ItemContainerTransitions>
                    <TransitionCollection>
                        <EntranceThemeTransition/>
                    </TransitionCollection>
                </GridView.ItemContainerTransitions>
                <GridView.HeaderTransitions>
                    <TransitionCollection>
                        <EntranceThemeTransition/>
                    </TransitionCollection>
                </GridView.HeaderTransitions>
                <GridView.ItemTemplate>
                    <DataTemplate>
                        <GridViewItem>
                            <Image Height="280" Width="280" Source="{Binding IconUrl}"/>
                             <i:EventToCommandCollection.Items>
                                <i:EventToCommand Command="{Binding MenuCMD}" 
                                                  CommandParameter="{Binding NavigateParameter}" 
                                                  NavigateUrl="{Binding NavigateUrl}"
                                                  Event="ItemClick"/>
                            </i:EventToCommandCollection.Items>
                        </GridViewItem>
                    </DataTemplate>
                </GridView.ItemTemplate>
                <GridView.ItemsPanel>
                    <ItemsPanelTemplate>
                        <VariableSizedWrapGrid Orientation="Vertical" Margin="0,0,80,0"
                               ItemWidth="300" ItemHeight="300" MaximumRowsOrColumns="10"/>
                    </ItemsPanelTemplate>
                </GridView.ItemsPanel>
            </GridView>
        </Grid>
    </Viewbox>

</common:LayoutAwarePage>

下面这一段是ViewModel中对命令的处理，以及菜单的动态加载

using GalaSoft.MvvmLight;

using IntTourism.Com.Transvalue.Service;
using GalaSoft.MvvmLight.Command;
using System.Diagnostics;
using Windows.UI.Xaml.Controls;
using System.Collections;
using System.Collections.ObjectModel;
using IntTourism.Com.Transvalue.Model;
using GalaSoft.MvvmLight.Messaging;
using System;
using System.ComponentModel;
using System.Collections.Generic;
using IntTourism.Com.Transvalue.Bean;
using IntTourism.Com.Transvalue.Tools;
using IntTourism.Com.Transvalue.Const;
using System.Threading.Tasks;

namespace IntTourism.ViewModel
{
    /// <summary>
    /// This class contains properties that the main View can data bind to.
    /// <para>
    /// See http://www.galasoft.ch/mvvm
    /// </para>
    /// </summary>
    public class MainViewModel : ViewModelBase
    {
        private readonly IMainPageSerivce _dataService;

        #region Command
        private RelayCommand<ExCommandParameter> _menuCMD;

        /// <summary>
        /// Gets the MenuCMD.
        /// </summary>
        public RelayCommand<ExCommandParameter> MenuCMD
        {
            get
            {
                return _menuCMD ?? (_menuCMD = new RelayCommand<ExCommandParameter>(
                    ExecuteMenuCMD,
                    CanExecuteMenuCMD));
            }
        }

        private async void ExecuteMenuCMD(ExCommandParameter url)
        {
            await Task.Run(() =>
            {
                var nav = new NavigateParameter();
                nav.Parameter = url.Parameter;
                nav.PageType = url.NavigateUrl;
                if (null != url.NavigateUrl)
                {
                    Messenger.Default.Send<bool>(true, "ContentBusy");
                    Messenger.Default.Send<NavigateParameter>(nav, "MenuNavigate");
                }
            });
        }

        private bool CanExecuteMenuCMD(ExCommandParameter url)
        {
            if (null != url && !"".Equals(url))
                return true;
            else return false;
        }
        #endregion

        #region DataProperties

        #region MenuItems
        /// <summary>
        /// The <see cref="MenuItems" /> property's name.
        /// </summary>
        public const string MenuItemsPropertyName = "MenuItems";

        private ObservableCollection<MenuItem> _menuItems;

        /// <summary>
        /// Sets and gets the MenuItems property.
        /// Changes to that property's value raise the PropertyChanged event. 
        /// This property's value is broadcasted by the MessengerInstance when it changes.
        /// </summary>
        public ObservableCollection<MenuItem> MenuItems
        {
            get
            {
                return _menuItems;
            }

            set
            {
                if (_menuItems == value)
                {
                    return;
                }

                RaisePropertyChanging(() => MenuItems);
                var oldValue = _menuItems;
                _menuItems = value;
                RaisePropertyChanged(() => MenuItems, oldValue, value, true);
            }
        }
        #endregion

        /// <summary>
        /// The <see cref="WelcomeTitle" /> property's name.
        /// </summary>
        public const string WelcomeTitlePropertyName = "WelcomeTitle";

        private string _welcomeTitle;

        /// <summary>
        /// Sets and gets the WelcomeTitle property.
        /// Changes to that property's value raise the PropertyChanged event. 
        /// This property's value is broadcasted by the MessengerInstance when it changes.
        /// </summary>
        public string WelcomeTitle
        {
            get
            {
                return _welcomeTitle;
            }

            set
            {
                if (_welcomeTitle == value)
                {
                    return;
                }

                RaisePropertyChanging(WelcomeTitlePropertyName);
                var oldValue = _welcomeTitle;
                _welcomeTitle = value;
                RaisePropertyChanged(WelcomeTitlePropertyName, oldValue, value, true);
            }
        }
        #endregion

        /// <summary>
        /// Initializes a new instance of the MainViewModel class.
        /// </summary>
        public MainViewModel(IMainPageSerivce dataService)
        {
            _dataService = dataService;
            InitPropertyChanged();
            _dataService.GetItemData(
                async (items, error) =>
                {
                    if (await Pollute.ReportError(error, "GetItemData", ErrorDesc._E01))
                    {
                        Messenger.Default.Send<bool>(false, "ContentBusy");
                        return;
                    }
                    var data = await items;
                    foreach (var item in data)
                        item.MenuCMD = MenuCMD;
                    MenuItems = data;
                    Messenger.Default.Send<bool>(false, "ContentBusy");
                });
        }


        #region PropertyChangeMethods

        /// <summary>
        /// 初始化相关方法
        /// </summary>
        private void InitPropertyChanged()
        {
            PropertyChanging += PropertyChangingMethod;
            PropertyChanged += PropertyChangedMethod;
        }

        //private static Dictionary<Predicate<string>, Action> PropertyChangingActions;
        //private static Dictionary<Predicate<string>, Action> PropertyChangedActions;
        private void PropertyChangedMethod(object sender, PropertyChangedEventArgs e)
        {


        }

        private void PropertyChangingMethod(object sender, PropertyChangingEventArgs e)
        {

        }
        #endregion


        public override void Cleanup()
        {
            // Clean up if needed
            base.Cleanup();
        }

    }
}

菜单实例数据：

using System;
using System.Collections.ObjectModel;
using System.Threading.Tasks;
using IntTourism.Com.Transvalue.Bean;
using IntTourism.Com.Transvalue.Model;
using IntTourism.Com.Transvalue.Service;

namespace IntTourism.Com.Transvalue.Service.Impl
{
    public class MainPageService : IMainPageSerivce
    {
        public void GetData(Action<DataItem, Exception> callback)
        {
            var item = new DataItem("Welcome to MVVM Light");
            callback(item, null);
        }


        public void GetItemData(Action<Task<ObservableCollection<MenuItem>>, Exception> callback)
        {
            var result = Task.Run(() =>
            {
                var items = new ObservableCollection<MenuItem>();
                var menu1 = new MenuItem();
                menu1.IconUrl = "../Assets/ICON/交通.png";
                menu1.NavigateUrl = "IntMaps";
                items.Add(menu1);
                var menu2 = new MenuItem();
                menu2.IconUrl = "../Assets/ICON/娱乐.png";
                menu2.NavigateUrl = "IntMaps";
                menu2.NavigateParameter = "Play";
                items.Add(menu2);
                var menu3 = new MenuItem();
                menu3.IconUrl = "../Assets/ICON/景点.png";
                menu3.NavigateUrl = "SceneViewGroup";
                items.Add(menu3);
                var menu4 = new MenuItem();
                menu4.IconUrl = "../Assets/ICON/购物.png";
                menu4.NavigateUrl = "IntMaps";
                menu4.NavigateParameter = "Buy";
                items.Add(menu4);
                var menu5 = new MenuItem();
                menu5.IconUrl = "../Assets/ICON/专题旅游.png";
                menu5.NavigateUrl = "SceneViewGroup";
                menu5.NavigateParameter = "Travel";
                items.Add(menu5);
                var menu6 = new MenuItem();
                menu6.IconUrl = "../Assets/ICON/实用信息.png";
                items.Add(menu6);
                var menu7 = new MenuItem();
                menu7.IconUrl = "../Assets/ICON/武汉之最.png";
                items.Add(menu7);
                var menu8 = new MenuItem();
                menu8.IconUrl = "../Assets/ICON/住宿.png";
                menu8.NavigateUrl = "IntMaps";
                menu8.NavigateParameter = "Rest";
                items.Add(menu8);
                var menu9 = new MenuItem();
                menu9.IconUrl = "../Assets/ICON/推荐线路.png";
                items.Add(menu9);
                //var menu10 = new MenuItem();
                //menu10.IconUrl = "../Assets/ICON/武汉介绍.png";
                //items.Add(menu10);
                var menu11 = new MenuItem();
                menu11.IconUrl = "../Assets/ICON/周边旅游.png";
                menu11.NavigateUrl = "IntMaps";
                menu11.NavigateParameter = "AllTravel";
                items.Add(menu11);
                var menu12 = new MenuItem();
                menu12.IconUrl = "../Assets/ICON/旅游动态.png";
                items.Add(menu12);
                var menu13 = new MenuItem();
                menu13.IconUrl = "../Assets/ICON/美图欣赏.png";
                items.Add(menu13);
                var menu14 = new MenuItem();
                menu14.IconUrl = "../Assets/ICON/天气预报.png";
                items.Add(menu14);
                var menu15 = new MenuItem();
                menu15.IconUrl = "../Assets/ICON/旅游咨询.png";
                items.Add(menu15);
                var menu16 = new MenuItem();
                menu16.IconUrl = "../Assets/ICON/美食.png";
                menu16.NavigateUrl = "IntMaps";
                menu16.NavigateParameter = "Eat";
                items.Add(menu16);
                return items;
            });
            callback(result, null);
        }
    }
}

以上sample 数据可以存入数据库中进行动态配置，完成菜单的动态显示，降低了程序的耦合，增加了可配置性。

[2] Wax框架简要教程(2)安装

来源: 互联网发布时间: 2014-02-18

Wax框架简明教程(2)安装

一、安装Wax

当前，我们推荐你使用Xcode3创建Wax项目。Xcode4的项目模板仍然有些问题，因此请使用Xcode3。

1. 从http://github.com/probablycorey/wax/下载Wax或者用git命令将它复制到本地

2. 在shell中，转到wax文件夹，输入rake install命令。这将安装xcode项目模板。

3. 你知道Lua吗？如果你熟悉Javascript、Python、Runby之类的动态语言，你通过5分钟的学习就能入门。你可以阅读这些免费教程或者买本《Programingin Lua》。

二、创建新项目

打开Xcode，创建一个 Wax项目，该模板可以在 User Templates 中找到。

从现在开始，APP_ROOT将代表项目本身所在的路径。

运行app，你将在iPhone模拟器中看到Hello Lua字样。

三、开始使用Lua

并不需要在Xcode中编写Lua代码，它们全都在APP_ROOT/scripts目录下，直接用你喜欢的文本编辑工具编辑它们好了。Wax标准库文件位于APP_ROOT/wax/lib/stdlib目录下。这些全是你会用到的代码！

如果你使用TextMate，从APP_ROOT目录下执行rake tm，以便从项目打开。还可以安装wax-bundle已支持快捷键。
如果你迷恋于Xcode，你可以试试 capgo.com's 的语法加亮插件。
如果你使用的是vi或Emacs，你总不会连Lua支持都不会装吧？

要创建一个TableView，首先创建一个文件： APP_ROOT/scripts/MyTableViewController.lua
要创建新的OC控制器类，使用：

waxClass{"MyTableViewController",UITableViewController}

现在实现init函数，在里面设置tableView的内容并调用父类的init方法（正如你在OC中所做的一样）。

function init(self)

self.super:initWithStyle(UITableViewStylePlain)

-- Here are the tableView'scontents

self.things ={"Planes", "Trains", "Automobiles"}

return self

end

接下来实现UIDataSource协议方法。最终 MyTableViewController.lua 文件如下所示：

waxClass{"MyTableViewController",UITableViewController}

function init(self)

self.super:initWithStyle(UITableViewStylePlain)

-- Here are thetableView's contents

self.things ={"Planes", "Trains", "Automobiles"}

return self

end

functionnumberOfSectionsInTableView(self, tableView)

return 1

end

functiontableView_numberOfRowsInSection(self, tableView, section)

return #self.things

end

functiontableView_cellForRowAtIndexPath(self, tableView, indexPath)

local identifier ="MyTableViewControllerCell"

local cell =tableView:dequeueReusableCellWithIdentifier(identifier) or

UITableViewCell:initWithStyle_reuseIdentifier(UITableViewCellStyleDefault,identifier)

local thing =self.things[indexPath:row() + 1] -- Must +1 because Lua arrays are 1 based

cell:textLabel():setText(thing)

return cell

end

最后就是创建MyTableViewController示例并加到主窗口中。这需要修改APP_ROOT/scripts/AppDelegate.lua。它跟我们在OC程序中的UIApplicationDelegate是一样的。

require"MyTableViewController"

waxClass{"AppDelegate",protocols = {"UIApplicationDelegate"}}

functionapplicationDidFinishLaunching(self, application)

local frame =UIScreen:mainScreen():bounds()

self.window =UIWindow:initWithFrame(frame)

self.controller =MyTableViewController:init()

self.window:addSubview(self.controller:view())

self.window:makeKeyAndVisible()

end

运行程序…你已经用Lua创建了一个真正的UITableView！这真是太好了。

四、Wax framework安装

在这里下载framework：https://github.com/downloads/probablycorey/wax/wax.framework.zip

五、在项目中以framwork方式使用wax

1. 用Xcode打开项目，将wax.framework拖到Xcode的frameworks组下。确保勾选"Copy items into destination group's folder"。

2. 新建init.lua（确保加到了应用程序束中）。在文件中加入代码：

puts("ZOMG, LUA IS RUNNING")

puts("Here is Lua talking to ObjC%s", tostring(UIApplication:sharedApplication()))

3. 打开AppDelegate文件，导入wax头文件：

#import "wax/wax.h"

4. 在AppDelegate的application:didFinishLaunchingWithOptions:方法中加入：

wax_start("init.lua",nil);

// To add wax with extensions, use thisline instead

// #import "wax/wax_http.h"

// #import "wax/wax_json.h"

// #import"wax/wax_filesystem.h"

// wax_start("init.lua",luaopen_wax_http, luaopen_wax_json, luaopen_wax_filesystem, nil);

最后，build and run，你将在Xcode控制台重看到Lua输出的内容。

[3] 异步加载数据的三种兑现

来源: 互联网发布时间: 2014-02-18

异步加载数据的三种实现

package com.testasyntextview;
/**
 * 把获取的线程写到方法中(比较好)
 */
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.Html;
import android.text.Spanned;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MethodTestAsynTextViewActivity extends Activity {
	private TextView textView1;
	private Button button1;
	private Context context;
	private ProgressDialog progressDialog;
	private Spanned html;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		context = this;
		textView1 = (TextView) findViewById(R.id.textView1);
		button1 = (Button) findViewById(R.id.button1);
		button1.setOnClickListener(l);

	}

	private OnClickListener l = new OnClickListener() {

		@Override
		public void onClick(View v) {

			progressDialog = ProgressDialog.show(context, "获取数据中", "等待");
			getHtmlDate();

		}
	};

	private void getHtmlDate() {// 获取数据,把线程写入了其中
		new Thread() {
			public void run() {
				Message msg = myHandler.obtainMessage();
				try {
					html = HttpUtil.fromHtml(HttpUtil
							.getHtml("http://wap.sina.com"));
					msg.what = 0;
				} catch (Exception e) {
					e.printStackTrace();
					msg.what = 1;
				}

				myHandler.sendMessage(msg);
			}
		}.start();
	}

	Handler myHandler = new Handler() {

		public void handleMessage(Message msg) {
			switch (msg.what) {
			case 0:
				textView1.setText(html);
				progressDialog.dismiss();
				break;
			case 1:
				textView1.setText("当前无数据");
				progressDialog.dismiss();
				break;
			}
			super.handleMessage(msg);
		}
	};

}

package com.testasyntextview;

/**
 * 使用AsyncTask类
 */
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.Html;
import android.text.Spanned;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class TestAsynTextViewActivity extends Activity {
	private TextView textView1;
	private Button button1;
	private Context context;
	private ProgressDialog progressDialog;
	private Spanned html;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		context = this;

		progressDialog = new ProgressDialog(context);
		progressDialog.setTitle("进度条");
		progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

		textView1 = (TextView) findViewById(R.id.textView1);
		button1 = (Button) findViewById(R.id.button1);
		button1.setOnClickListener(l);

	}

	private OnClickListener l = new OnClickListener() {

		@Override
		public void onClick(View v) {
			new InitTask().execute("http://wap.sina.com",
					"http://wap.baidu.com");

		}
	};

	private void getHtmlDate(String url) {// 获取数据,把线程写入了其中

		try {
			html = HttpUtil.fromHtml(HttpUtil.getHtml(url));
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	/**
	 * When an asynchronous task is executed, the task goes through 4 steps:
	 * 
	 * onPreExecute(), 
	 * invoked on the UI thread immediately after the task is
	 * executed. This step is normally used to setup the task, for instance by
	 * showing a progress bar in the user interface. 
	 * 
	 * doInBackground(Params...),
	 * invoked on the background thread immediately after onPreExecute()
	 * finishes executing. This step is used to perform background computation
	 * that can take a long time. The parameters of the asynchronous task are
	 * passed to this step. The result of the computation must be returned by
	 * this step and will be passed back to the last step. This step can also
	 * use 
	 * 
	 * publishProgress(Progress...) to publish one or more units of
	 * progress. These values are published on the UI thread, in the
	 * 
	 * onProgressUpdate(Progress...) step. onProgressUpdate(Progress...),
	 * invoked on the UI thread after a call to publishProgress(Progress...).
	 * The timing of the execution is undefined. This method is used to display
	 * any form of progress in the user interface while the background
	 * computation is still executing. For instance, it can be used to animate a
	 * progress bar or show logs in a text field. onPostExecute(Result), invoked
	 * on the UI thread after the background computation finishes. The result of
	 * the background computation is passed to this step as a parameter.
	 */

	class InitTask extends AsyncTask<String, Integer, Long> {
		protected void onPreExecute() {
			progressDialog.show();
			super.onPreExecute();

		}

		protected Long doInBackground(String... params) {// Long是结果 String 是入口参数

			getHtmlDate(params[0]);// 可以运行两个任务
			publishProgress(50);// 发送进度50%
			getHtmlDate(params[1]);
			publishProgress(100);// 发送进度100%

			return (long) 1;

		}

		@Override
		protected void onProgressUpdate(Integer... progress) {

			progressDialog.setProgress(progress[0]);// 设置进度
			super.onProgressUpdate(progress);
			Log.e("测试", progress[0] + "");

		}

		@Override
		protected void onPostExecute(Long result) {

			setTitle(result + "测试");
			textView1.setText(html);
			progressDialog.dismiss();

			super.onPostExecute(result);

		}

	}

}

package com.testasyntextview;
/**
 * 使用Runable
 */
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.Html;
import android.text.Spanned;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class RunableTestAsynTextViewActivity extends Activity {
	private TextView textView1;
	private Button button1;
	private Context context;
	private ProgressDialog progressDialog;
	private Spanned html;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		context = this;
		textView1 = (TextView) findViewById(R.id.textView1);
		button1 = (Button) findViewById(R.id.button1);
		button1.setOnClickListener(l);

	}

	private OnClickListener l = new OnClickListener() {

		@Override
		public void onClick(View v) {

			progressDialog = ProgressDialog.show(context, "获取数据中", "等待");
			new Thread(new ThreadDemo()).start();

		}
	};

	private void getHtmlDate() {
		try {
			html = HttpUtil.fromHtml(HttpUtil.getHtml("http://wap.sina.com"));
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	class ThreadDemo implements Runnable {//一个runable
		public void run() {
			getHtmlDate();
			myHandler.sendEmptyMessage(0);
		}
	}

	Handler myHandler = new Handler() {

		public void handleMessage(Message msg) {
			switch (msg.what) {
			case 0:
				textView1.setText(html);
				progressDialog.dismiss();
				break;
			case 1:
				textView1.setText("当前无数据");
				progressDialog.dismiss();
				break;
			}
			super.handleMessage(msg);
		}
	};

}

package com.testasyntextview;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import android.graphics.drawable.Drawable;
import android.text.Html;
import android.text.Spanned;

public class HttpUtil {
	public static String getHtml(String path) throws Exception {
		URL url = new URL(/blog_article/path/index.html);
		HttpURLConnection conn = (HttpURLConnection) url.openConnection();
		conn.setRequestMethod("GET");
		conn.setConnectTimeout(5 * 1000);
		InputStream inStream = conn.getInputStream();// 通过输入流获取html数据
		byte[] data = readInputStream(inStream);// 得到html的二进制数据
		String html = new String(data, "utf-8");
		return html;
	}

	public static byte[] readInputStream(InputStream inStream) throws Exception {
		ByteArrayOutputStream outStream = new ByteArrayOutputStream();
		byte[] buffer = new byte[1024];
		int len = 0;
		while ((len = inStream.read(buffer)) != -1) {
			outStream.write(buffer, 0, len);
		}
		inStream.close();
		return outStream.toByteArray();
	}

	public static Spanned fromHtml(String html) {
		Spanned sp = Html.fromHtml(html, new Html.ImageGetter() {
			@Override
			public Drawable getDrawable(String source) {
				InputStream is = null;
				try {
					is = (InputStream) new URL(/blog_article/source/index.html).getContent();
					Drawable d = Drawable.createFromStream(is, "src");
					d.setBounds(0, 0, d.getIntrinsicWidth(),
							d.getIntrinsicHeight());
					is.close();
					return d;
				} catch (Exception e) {
					return null;
				}
			}
		}, null);
		return sp;

	}
}