【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。
