安卓中MVP模式和RxAndroid的具体实现例子

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2015-10-24 11:27 6815人阅读评论(10)收藏举报

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Android开发（39）

目录(?)[+]

安卓中MVP模式和RxAndroid的具体实现例子

MVP模式和RxAndroid是两个东西，这里因为懒得分开写，所以写到了一起写到了同一个例子里面。

MVP是什么

参考博客：框架模式MVP在Android中的使用
在MVC框架中，View是可以直接读取Model模型中的数据的，Model模型数据发生改变是会通知View数据显示发生相应的改变。
而在MVP中Model和View之间的没有任何联系，是两个完全独立的模块，当Model模型发生数据改变时，通过Presenter通知View视图发生相应的UI改变。
根据单一职责原则，Activity主要起到用户交互作用，也就是接收用户输入，显示请求结果。因此可以通过MVP框架模式来减轻Activity的职责。

RxAndroid是什么

Github:ReactiveX/RxAndroid
参考博客：给 Android 开发者的 RxJava 详解
RxAndroid可以简单高度概括为“异步”。
异步操作很关键的一点是程序的简洁性，因为在调度过程比较复杂的情况下，异步代码经常会既难写也难被读懂。 Android 创造的 AsyncTask 和Handler ，其实都是为了让异步代码更加简洁。RxJava 的优势也是简洁，但它的简洁的与众不同之处在于，随着程序逻辑变得越来越复杂，它依然能够保持简洁。

具体例子代码

对MVP和RxAndroid不了解的可以去上面说的博客去看一下，都是很好的博客，感谢大牛分享！
我这里以最简单粗暴的方式贴出代码，建议先上手再研究，先能够让程序跑起来，再去研究代码里面的实现原理。
效果图

引入RxAndroid：在dependencies下面加入如下代码
compile ‘io.reactivex:rxandroid:1.0.1’
compile ‘io.reactivex:rxjava:1.0.14’

bean

这里是一个简单的例子，User只有一个属性。

<code class="language-java hljs  has-numbering"><span class="hljs-keyword">package</span> com.regulus.rxandroidtest;<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">User</span> {</span>    <span class="hljs-keyword">public</span> String name;    <span class="hljs-keyword">public</span> <span class="hljs-title">User</span>(String name) {        <span class="hljs-keyword">this</span>.name = name;    }}</code><ul style="" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li></ul>

Model

<code class="language-java hljs  has-numbering"><span class="hljs-keyword">package</span> com.regulus.rxandroidtest;<span class="hljs-keyword">import</span> android.os.SystemClock;<span class="hljs-keyword">import</span> rx.Observable;<span class="hljs-keyword">import</span> rx.Subscriber;<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">UserModel</span> {</span>    <span class="hljs-keyword">public</span> Observable<User> <span class="hljs-title">getUser</span>() {        <span class="hljs-keyword">return</span> Observable.create(<span class="hljs-keyword">new</span> Observable.OnSubscribe<User>() {            <span class="hljs-annotation">@Override</span>            <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">call</span>(Subscriber<? <span class="hljs-keyword">super</span> User> subscriber) {                <span class="hljs-comment">// 设置个2000ms的延迟，模拟网络访问、数据库操作等等延时操作</span>                SystemClock.sleep(<span class="hljs-number">2000</span>);<span class="hljs-comment">//                final User user = null;</span>                <span class="hljs-keyword">final</span> User user = <span class="hljs-keyword">new</span> User(<span class="hljs-string">"赵日天"</span>);                <span class="hljs-keyword">if</span> (user == <span class="hljs-keyword">null</span>) {                    subscriber.onError(<span class="hljs-keyword">new</span> Exception(<span class="hljs-string">"User = null"</span>));                } <span class="hljs-keyword">else</span> {                    subscriber.onNext(user);                    subscriber.onCompleted();                }            }        });    }}</code><ul style="" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li></ul>

View

定义View的接口，把Activity看成View，实现View接口。
Activity只负责监听点击等事件，然后反馈给Presenter，由Presenter调度。

<code class="language-java hljs  has-numbering"><span class="hljs-keyword">package</span> com.regulus.rxandroidtest;<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">interface</span> <span class="hljs-title">UserView</span> {</span>    <span class="hljs-keyword">void</span> updateView(User user);    <span class="hljs-keyword">void</span> showProgressDialog();    <span class="hljs-keyword">void</span> hideProgressDialog();    <span class="hljs-keyword">void</span> showError(String msg);}</code><ul style="" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li></ul>

<code class="language-java hljs  has-numbering"><span class="hljs-keyword">package</span> com.regulus.rxandroidtest;<span class="hljs-keyword">import</span> android.app.ProgressDialog;<span class="hljs-keyword">import</span> android.content.Context;<span class="hljs-keyword">import</span> android.os.Bundle;<span class="hljs-keyword">import</span> android.support.v7.app.AppCompatActivity;<span class="hljs-keyword">import</span> android.view.View;<span class="hljs-keyword">import</span> android.widget.TextView;<span class="hljs-keyword">import</span> android.widget.Toast;<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MainActivity</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">AppCompatActivity</span> <span class="hljs-keyword">implements</span> <span class="hljs-title">UserView</span> {</span>    <span class="hljs-keyword">private</span> Context context;    <span class="hljs-keyword">private</span> TextView mTvShow;    <span class="hljs-keyword">private</span> ProgressDialog mProgressDialog;    <span class="hljs-keyword">private</span> UserPresenter mUserPresenter;    <span class="hljs-annotation">@Override</span>    <span class="hljs-keyword">protected</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onCreate</span>(Bundle savedInstanceState) {        <span class="hljs-keyword">super</span>.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        context = <span class="hljs-keyword">this</span>;        mUserPresenter = <span class="hljs-keyword">new</span> UserPresenter(<span class="hljs-keyword">this</span>);        mProgressDialog = <span class="hljs-keyword">new</span> ProgressDialog(context);        mProgressDialog.setMessage(<span class="hljs-string">"正在加载，请稍后.."</span>);        mTvShow = (TextView) findViewById(R.id.tv_show);        findViewById(R.id.btn_update).setOnClickListener(<span class="hljs-keyword">new</span> View.OnClickListener() {            <span class="hljs-annotation">@Override</span>            <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onClick</span>(View v) {                mUserPresenter.getUser();            }        });    }    <span class="hljs-annotation">@Override</span>    <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">updateView</span>(User user) {        <span class="hljs-keyword">if</span> (user == <span class="hljs-keyword">null</span>) <span class="hljs-keyword">return</span>;        mTvShow.setText(user.name);    }    <span class="hljs-annotation">@Override</span>    <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">showProgressDialog</span>() {        mProgressDialog.show();    }    <span class="hljs-annotation">@Override</span>    <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">hideProgressDialog</span>() {        mProgressDialog.hide();    }    <span class="hljs-annotation">@Override</span>    <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">showError</span>(String msg) {        Toast.makeText(context, msg, Toast.LENGTH_SHORT).show();    }}</code><ul style="" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li><li>46</li><li>47</li><li>48</li><li>49</li><li>50</li><li>51</li><li>52</li><li>53</li><li>54</li><li>55</li><li>56</li><li>57</li><li>58</li><li>59</li><li>60</li><li>61</li></ul>

Presenter

Presenter相当于MVC中的控制器，负责Model和View的沟通。

<code class="language-java hljs  has-numbering"><span class="hljs-keyword">package</span> com.regulus.rxandroidtest;<span class="hljs-keyword">import</span> rx.Subscriber;<span class="hljs-keyword">import</span> rx.android.schedulers.AndroidSchedulers;<span class="hljs-keyword">import</span> rx.schedulers.Schedulers;<span class="hljs-javadoc">/** * Presenter作为Model和View通讯的桥梁，需要持有它们的引用。 */</span><span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">UserPresenter</span> {</span>    <span class="hljs-keyword">private</span> UserView mUserView;    <span class="hljs-keyword">private</span> UserModel mUserModel;    <span class="hljs-keyword">public</span> <span class="hljs-title">UserPresenter</span>(UserView mUserView) {        <span class="hljs-keyword">this</span>.mUserView = mUserView;        mUserModel = <span class="hljs-keyword">new</span> UserModel();    }    <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">getUser</span>() {        mUserView.showProgressDialog();        <span class="hljs-comment">// 这里如果使用 Lambda 会更简洁</span>        mUserModel.getUser()                .subscribeOn(Schedulers.io())<span class="hljs-comment">// 在非UI线程中执行getUser</span>                .observeOn(AndroidSchedulers.mainThread())<span class="hljs-comment">// 在UI线程中执行结果</span>                .subscribe(<span class="hljs-keyword">new</span> Subscriber<User>() {                    <span class="hljs-annotation">@Override</span>                    <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onNext</span>(User user) {                        mUserView.updateView(user);                    }                    <span class="hljs-annotation">@Override</span>                    <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onCompleted</span>() {                        mUserView.hideProgressDialog();                    }                    <span class="hljs-annotation">@Override</span>                    <span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onError</span>(Throwable e) {                        mUserView.showError(e.getMessage());                        mUserView.hideProgressDialog();                    }                });    }}</code><ul style="" class="pre-numbering"><li>1</li><li>2</li><li>3</li><li>4</li><li>5</li><li>6</li><li>7</li><li>8</li><li>9</li><li>10</li><li>11</li><li>12</li><li>13</li><li>14</li><li>15</li><li>16</li><li>17</li><li>18</li><li>19</li><li>20</li><li>21</li><li>22</li><li>23</li><li>24</li><li>25</li><li>26</li><li>27</li><li>28</li><li>29</li><li>30</li><li>31</li><li>32</li><li>33</li><li>34</li><li>35</li><li>36</li><li>37</li><li>38</li><li>39</li><li>40</li><li>41</li><li>42</li><li>43</li><li>44</li><li>45</li></ul>

博客大部分都是代码，文笔实在不好……

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