第一个Android DemoChat(伪即使通讯)

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</pre> 学习Android到现在估计应该还不到一个月的时间，我很激动能够在自己的努力还有奋斗下开发一个自己想要的App,虽然这个App的功能还不够完善，界面很丑陋，Bug很存在很多，但是我觉得这个起码是我自己动用智慧开发的第一个App,所以我要在这里将我开发的思路还有一个想法写在这里。<span class="token lf" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap; outline:none!important"></span><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"></span><p></p><p><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"><span style="white-space:pre"></span>以实现功能：</span><span class="token lf" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap; outline:none!important"></span><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"></span></p><p><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"><span style="white-space:pre"></span>即时通讯：不能好友之间可以即时通讯。但是同时只能和一个人通讯。</span><span class="token lf" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap; outline:none!important"></span><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"></span></p><p><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"><span style="white-space:pre"></span>注 册：注册功能实现，但是数据保存的是客户端，即是在Android本地的数据库，并没有将用户保存到服</span><span class="token lf" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap; outline:none!important"></span><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"><span style="white-space:pre"></span>服务器。</span><span class="token lf" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap; outline:none!important"></span><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"></span></p><p><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"><span style="white-space:pre"></span>登 录：登录会自动和本地数据库中进行校对,基本的登录思想。</span><span class="token lf" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap; outline:none!important"></span><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"></span></p><p><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"><span style="white-space:pre"></span>添加好友：当前数据库中存在好友时，可以实现添加到好友列表。Bug：Sqlite的用法还是不够熟练，</span><span class="token lf" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap; outline:none!important"></span><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"><span style="white-space:pre"></span>当存在该好友的情况下还是可以继续添加该还有</span><span class="token lf" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap; outline:none!important"></span><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"></span><span class="token lf" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap; outline:none!important"></span><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"></span></p><p><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"></span></p><p><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap">用到的知识：</span><span class="token lf" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap; outline:none!important"></span><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"></span></p><p><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"><span style="white-space:pre"></span>基本的Android界面布局，Sqlite，Servlet（服务器端），JavaBean思想，sHttp协议，Android中的</span><span class="token lf" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap; outline:none!important"></span><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"> Http操作，ListView，自定义ArrayAdapter,Android中Activity的生命周期，Activity中的定时操</span><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap">作，异步处理，子线程处理。</span></p><p><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"></span></p><p><span class="token lf" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap; outline:none!important"></span><span class="token lf" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap; outline:none!important"></span><span class="token lf" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap; outline:none!important"></span><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap">功能详解：</span><span class="token lf" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap; outline:none!important"></span><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:16.2px; white-space:pre-wrap"></span></p><p><span class="token pre" style="font-size:0.9em; color:rgb(52,52,52); font-family:'Source Code Pro',monospace; white-space:pre-wrap; outline:none!important"></span><span class="token pre" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; white-space:pre-wrap; outline:none!important"><span style="font-size:18px">Login（登录界面）：</span></span></p><p><span class="token pre" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; white-space:pre-wrap; outline:none!important"><span style="font-size:18px"><img src="http://img.blog.csdn.net/20160527124853791?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" /></span></span></p><p><span class="token p" style="color:rgb(90,90,90); font-family:'microsoft yahei'; font-size:18px; line-height:29.7px; white-space:pre-wrap; outline:none!important">作为App的主页面，虽然丑陋了一点，但是它起到的作用也就是仅仅登录作用，当点击登录之后，会自动</span><span class="token p" style="color:rgb(90,90,90); font-family:'microsoft yahei'; font-size:18px; line-height:29.7px; white-space:pre-wrap; outline:none!important">和<span style="white-space:pre"></span>本地数据库中做校验，存在即登录，失败即提示无法登陆；</span><span class="token lf" style="color:rgb(90,90,90); font-family:'microsoft yahei'; font-size:18px; line-height:29.7px; white-space:pre-wrap; outline:none!important"></span><span class="token p" style="color:rgb(90,90,90); font-family:'microsoft yahei'; font-size:18px; line-height:29.7px; white-space:pre-wrap; outline:none!important"></span><span class="token pre" style="font-size:0.9em; color:rgb(52,52,52); font-family:'Source Code Pro',monospace; white-space:pre-wrap; outline:none!important"></span></p><p><span class="token pre" style="font-size:0.9em; color:rgb(52,52,52); font-family:'Source Code Pro',monospace; white-space:pre-wrap; outline:none!important"><img src="http://img.blog.csdn.net/20160527125415498?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" /></span></p><p><span class="token pre" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; white-space:pre-wrap; outline:none!important"><span style="font-size:0.9em; white-space:pre"></span><span style="font-size:18px">Regist（注册页面）：<span class="token lf" style="outline:none!important"></span></span></span></p><p><span class="token pre" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; white-space:pre-wrap; outline:none!important"><span style="font-size:18px"><span style="white-space:pre"></span>和登录息息相关的部分，登录即少不了注册</span></span></p><p><span class="token pre" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; white-space:pre-wrap; outline:none!important"><span style="font-size:18px"></span></span></p><p><span class="token pre" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; white-space:pre-wrap; outline:none!important"><span style="font-size:18px">。<img src="http://img.blog.csdn.net/20160527125541014" alt="" /><span class="token lf" style="outline:none!important"></span></span></span></p><p><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; white-space:pre-wrap"><span style="font-size:18px">注册提供最基本的用户名和密码，但是在数据库中会自动生成一个UUID当做该用户的主键</span></span></p><p><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; white-space:pre-wrap"><span style="font-size:18px"><span stString uuid = UUID.randomUUID().toString().replace("-", "").toUpperCase();好友列表：进入这个页面时，会自动从本地的数据库中查找好友。查找思想：<span style="white-space:pre">	</span>根据从Login页面获得到的User在本地数据库中进行查找。<span style="white-space:pre">	</span>如果找到那么就返回一个SingleFriend的Bean类。</span></span></p><p><span class="token lf" style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:0.9em; white-space:pre-wrap; outline:none!important"></span><span style="color:rgb(52,52,52); font-family:'Source Code Pro',monospace; font-size:0.9em; white-space:pre-wrap"></span></p><pre name="code" class="java" style="color: rgb(52, 52, 52); font-size: 16.2px;"><span style="font-size: 16.2px;"><span style="white-space: pre;">	</span>public singleFriend seachFriendforFriendList(String userName){		</span>

		List<Friend> list = new ArrayList<Friend>();
		String username;
		boolean falg=false;
		Cursor cursor=db.query("Friend", null, "user=?", new String[]{userName}, null, null, null);
		if (cursor.moveToFirst()) {
			falg=true;
			username=cursor.getString(cursor.getColumnIndex("user"));
			do{
				Friend friend = new Friend();
				friend.setFriendName(cursor.getString(cursor.getColumnIndex("friend")));
				friend.setMsg_path(cursor.getInt(cursor.getColumnIndex("img")));
				list.add(friend);
			}
			while(cursor.moveToNext());
			SingleFriend.setUserName(username);
			SingleFriend.setFriends(list);
			return SingleFriend;
			
		}
		 else if(!cursor.moveToFirst()) {
			 falg=false;
			SingleFriend=null;
			return SingleFriend;
		}		
		return SingleFriend;
			
	}

这个方法就是从本地数据库查找好友的方法。

其中在这个页面，需要自己重写一个FriendAdapter方法，

继承自ArrayAdapter<E>显示ListView中的具体类容。

其中ListView中的具体类容就和重写的这个方法的布局（Layout）还有<E>中的具体内容有关
添加好友页面：

会从数据库中查找你输入用户名，找到即返回，找不到就提示不存在。聊天界面：

好了基本的功能以及演示完毕了，我这个博客写的也是比较简单，但是我会不断充实我自己的。好困，睡觉去了。

说一下自己下阶段的打算：Android中的活动很重要，准备探索一下Activity生命周期；

    学习Android的Touch事件的监听；

                                                    学习基本的android动画。

第一个Android DemoChat(伪即使通讯)

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原文地址：http://blog.csdn.net/qq_28466365/article/details/51514371