【Android】7.8 MyDemos项目的结构和主界面相关代码

分类：C#、Android、VS2015；

创建日期：2016-02-17

一、简介

上一讲已经说过，系统升级为Win10后，重新创建了一个新的项目：MyDemos，并把前7章合并到了这个项目中，这次简单介绍一下合并后的项目结构以及主界面相关的代码。

二、项目结构

创建的MyDemos项目结构截图如下：

这些资源文件和活动文件的创建办法见前面章节的介绍，此处不再重复。

三、主界面相关的代码

1、修改Main.axml文件

将该文件改为下面的内容：

<?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">
    <TextView
        android:id="@+id/heading1"
        android:text="用C#和VS2015编写Android手机App"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="#00000000"
        android:textSize="16dp"
        android:textColor="#FFFF0000"
        android:textStyle="bold"
        android:padding="5dp"
        android:gravity="center_horizontal" />
    <TextView
        android:id="@+id/heading2"
        android:text="www.cnblogs.com/rainmj/"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="#00000000"
        android:textSize="14dp"
        android:textColor="#FF267F00"
        android:textStyle="bold"
        android:gravity="center_horizontal"
        android:paddingBottom="5dp" />
    <View
        android:layout_width="match_parent"
        android:layout_height="1dip"
        android:background="#FF909090"
        android:layout_marginBottom="5dp" />
    <ExpandableListView
        android:minWidth="25px"
        android:minHeight="25px"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/expandableListView1" />
</LinearLayout>

2、添加MyApplication.cs文件

在项目的根目录下添加该文件，然后将该文件改为下面的内容：

using System;
using Android.App;
using Android.Runtime;
using Com.Baidu.Mapapi;
namespace MyDemos
{
    [Application]
    public class MyApplication : Application
    {
        //必须提供此构造函数
        public MyApplication(IntPtr javaReference, JniHandleOwnership transfer)
            : base(javaReference, transfer)
        {
        }

        public override void OnCreate()
        {
            base.OnCreate();
            SDKInitializer.Initialize(ApplicationContext);
        }
    }
}

3、添加MyBroadcastReceiver.cs文件

在项目的根目录下添加该文件，然后将该文件改为下面的内容：

using Android.Content;
using Android.Widget;
using Com.Baidu.Mapapi;
using Android.Util;

namespace MyDemos
{
    [BroadcastReceiver]
    public class MyBroadcastReceiver : BroadcastReceiver
    {
        private MainActivity mainActivity;

        //必须提供无参数的构造函数
        public MyBroadcastReceiver() { }

        public MyBroadcastReceiver(MainActivity bdMapMain)
        {
            mainActivity = bdMapMain;
        }

        public override void OnReceive(Context context, Intent intent)
        {
            string s = intent.Action;
            TextView text = mainActivity.FindViewById<TextView>(Resource.Id.heading2);
            switch (s)
            {
                case SDKInitializer.SdkBroadtcastActionStringPermissionCheckError:
                    text.Text= "Andoid SDK（v3.7.1）key 验证出错!";
                    break;
                case SDKInitializer.SdkBroadtcastActionStringPermissionCheckOk:
                    Log.Debug("MainActivity", "百度Andoid SDK（v3.7.1）key 验证成功!");
                    break;
                case SDKInitializer.SdkBroadcastActionStringNetworkError:
                    text.Text = "Andoid SDK（v3.7.1）key 验证失败：网络出错!";
                    break;
            }
        }
    }
}

4、添加MyExpandableListAdapter.cs文件

在项目的根目录下添加该文件，然后将该文件改为下面的内容：

using System;
using System.Collections.Generic;
using Android.Content;
using Android.Views;
using Android.Widget;
using Android.Graphics;

namespace MyDemos
{
    public class Chapter
    {
        public string ChapterName { get; set; }
        public ChItem[] ChapterItems { get; set; }
    }

    public class ChItem
    {
        public Type type { get; set; }
        public string Title { get; set; }
        public string Desc { get; set; }
    }

    public class MyExpandableListAdapter : BaseExpandableListAdapter
    {
        private readonly Context context;
        private readonly IList<Chapter> chapter;
        public MyExpandableListAdapter(Context context, IList<Chapter> chapter)
        {
            this.context = context;
            this.chapter = chapter;
        }

        public override int GroupCount
        {
            get { return chapter.Count; }
        }

        public override bool HasStableIds
        {
            get{ return true; }
        }

        public override Java.Lang.Object GetChild(int groupPosition, int childPosition)
        {
            return null; 
        }

        public override long GetChildId(int groupPosition, int childPosition)
        {
            return childPosition;
        }

        public override int GetChildrenCount(int groupPosition)
        {
            var ch = chapter[groupPosition];
            return ch.ChapterItems.Length;
        }

        public override View GetChildView(int groupPosition, int childPosition, bool isLastChild, View convertView, ViewGroup parent)
        {
            var view = convertView;
            if (view == null)
            {
                var inflater = context.GetSystemService(Context.LayoutInflaterService) as LayoutInflater;
                view = inflater.Inflate(Android.Resource.Layout.SimpleExpandableListItem2, null);
            }
            var ch = chapter[groupPosition];
            var chItem = ch.ChapterItems[childPosition];
            TextView textView = view.FindViewById<TextView>(Android.Resource.Id.Text1);
            textView.Text = chItem.Title;
            textView.SetTextColor(Color.Blue);
            textView.TextSize = 12;
            textView = view.FindViewById<TextView>(Android.Resource.Id.Text2);
            textView.Text = chItem.Desc;
            textView.TextSize = 9;
            return view;
        }

        public override Java.Lang.Object GetGroup(int groupPosition)
        {
            return null;
        }

        public override long GetGroupId(int groupPosition)
        {
            return groupPosition;
        }

        public override View GetGroupView(int groupPosition, bool isExpanded, View convertView, ViewGroup parent)
        {
            var view = convertView;
            if (view == null)
            {
                var inflater = context.GetSystemService(Context.LayoutInflaterService) as LayoutInflater;
                view = inflater.Inflate(Android.Resource.Layout.SimpleExpandableListItem1, null);
            }
            var ch = chapter[groupPosition];
            TextView textView = view.FindViewById<TextView>(Android.Resource.Id.Text1);
            textView.Text = ch.ChapterName;
            textView.TextSize = 14;
            return view;
        }

        public override bool IsChildSelectable(int groupPosition, int childPosition)
        {
            return true;
        }
    }
}

5、修改MainActivity.cs文件

将该文件改为下面的内容：

using Android.App;
using Android.Content;
using Android.Widget;
using Android.OS;
using System.Collections.Generic;
using Com.Baidu.Mapapi.Model;
using Com.Baidu.Mapapi;
using MyDemos.SrcDemos;

namespace MyDemos
{
    [Activity(Label = "MyDemos--毛毛雨的博客乐园",
        MainLauncher = true, Icon = "@drawable/icon")]
    public class MainActivity : Activity
    {
        private IList<Chapter> chItems;
        private MyBroadcastReceiver myReceiver;

        //自定义的中心点位置经纬度，可以根据需要改为你自己感兴趣的任意经纬度
        public static readonly LatLng MyLatLng = new LatLng(34.824635, 114.315745);

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);
            SetContentView(Resource.Layout.Main);

            // 注册广播监听
            IntentFilter intentFilter = new IntentFilter();
            intentFilter.AddAction(SDKInitializer.SdkBroadtcastActionStringPermissionCheckOk);
            intentFilter.AddAction(SDKInitializer.SdkBroadtcastActionStringPermissionCheckError);
            intentFilter.AddAction(SDKInitializer.SdkBroadcastActionStringNetworkError);
            myReceiver = new MyBroadcastReceiver(this);
            RegisterReceiver(myReceiver, intentFilter);

            CreateChItems();
            var adapter = new MyExpandableListAdapter(this, chItems);
            var expandableListView1 = FindViewById<ExpandableListView>(Resource.Id.expandableListView1);
            expandableListView1.SetAdapter(adapter);
            expandableListView1.ChildClick += (sender, args) =>
            {
                var type = chItems[args.GroupPosition].ChapterItems[args.ChildPosition].type;
                if (type != null)
                {
                    StartActivity(new Intent(this, type));
                }
            };
        }

        protected override void OnResume()
        {
            base.OnResume();
        }

        protected override void OnDestroy()
        {
            base.OnDestroy();
            // 取消广播监听
            UnregisterReceiver(myReceiver);
        }

        private void CreateChItems()
        {
            chItems = new List<Chapter>();
            chItems.Add(new Chapter()
            {
                ChapterName = "第1章 开发环境安装和配置",
                ChapterItems = new ChItem[]
                {
                    new ChItem {type=null, Title="本章无示例", Desc = "" },
                }
            });
            chItems.Add(new Chapter()
            {
                ChapterName = "第2章 Android应用程序的调试和部署",
                ChapterItems = new ChItem[]
                {
                    new ChItem { type=typeof(ch0201Main), Title="例2-1 Phoneword", Desc = "演示如何导航到另一个界面以及如何拨号" },
                }
            });
            //后面章节的内容与前面类似，就不再全部列出了
            ……
        }
    }
}

OK，以后再添加后续章节的示例时，只需要在CreateChItems()方法中添加对应的代码即可，而其他内容则不需要做任何改变：

chItems.Add(new Chapter()

{

    ChapterName = "……",

    ChapterItems = new ChItem[]

    {

        ……

    };

});

下一讲接着介绍第8章的内容。