Use retrofit for network requests under Android Studio

<span id="Label3"></p>Environmental requirements <ul> <ul> <li>Android version 2.3 and above</li> <li>Java version 6 and above</li> </ul> </ul>Configuration <ul> <ul> <li>Adding references under the Gradle configuration file</li> </ul> </ul><pre class="prettyprint"><pre class="prettyprint"><code class=" hljs r">dependencies { <span class="hljs-keyword">...</span> <span class="hljs-string">‘com.squareup.retrofit:retrofit:1.9.0‘</span> <span class="hljs-keyword">...</span>}</code></pre></pre> <ul> <ul> <li>When Okhttp exists, retrofit uses okhttp to make a network request, using Okhttp's Add Reference as follows</li> </ul> </ul><pre class="prettyprint"><pre class="prettyprint"><code class=" hljs r">dependencies { <span class="hljs-keyword">...</span><span class="hljs-string">‘com.squareup.okhttp:okhttp-urlconnection:2.0.0‘</span><span class="hljs-string">‘com.squareup.okhttp:okhttp:2.0.0‘</span> <span class="hljs-keyword">...</span>}</code></pre></pre>Initiating a request<p><p>The following example is a simple asynchronous get request that uses retrofit to return a value of type string</p></p><p><p>First define an interface that declares a method in the interface to define the content of the request</p></p><pre class="prettyprint"><pre class="prettyprint"><code class=" hljs d"> <span class="hljs-keyword">interface</span> User { <span class="hljs-keyword">@GET</span>(<span class="hljs-string">"/user/list.json"</span>) <span class="hljs-keyword">void</span> getUsers(<span class="hljs-keyword">@Query</span>(<span class="hljs-string">"pagesize"</span><span class="hljs-keyword">int</span> pagesize, Callback<String> callback); }</code></pre></pre> <ul> <ul> <li><p>@GET indicate that the request is get mode, in addition to the @post, @PUT, @DELETE, and @head, the specific role please refer to the official documentation, due to space reasons, no longer described here.</p></li> <li><p>@Query for parameter declarations</p></li> <li><p>callback< string > is the callback interface, string indicates that the returned data result is a string type</p></li> </ul> </ul><p><p>Then create a Restadapter object with the following code</p></p><pre class="prettyprint"><pre class="prettyprint"><code class=" hljs avrasm">RestAdapter restAdapter = new RestAdapter<span class="hljs-preprocessor">.Builder</span>() <span class="hljs-preprocessor">.setEndpoint</span>(CTX)<span class="hljs-preprocessor">.setConverter</span>(new BaseConverter()) <span class="hljs-preprocessor">.build</span>()<span class="hljs-comment">;</span></code></pre></pre> <ul> <ul> <li><p>The setEndPoint method specifies the first half of the request address, which is the server address, such as <strong>https://api.github.com</strong></p></li> <li><p>The Setconverter method requires an implementation class for the transformation interface as a parameter, the function of which is to convert the requested InputStream to the desired type, the sample code is as follows</p></li> </ul> </ul><pre class="prettyprint"><code class=" hljs java"><span class="hljs-keyword"><span class="hljs-keyword"></span> public</span> <span class="hljs-class"><span class="hljs-class"> <span class="hljs-keyword">class</span> <span class="hljs-title">baseconverter</span> <span class="hljs-keyword">implements</span> <span class="hljs-title">Converter</span> {</span></span> <span class="hljs-annotation"><span class="hljs-annotation">@Override</span></span> <span class="hljs-keyword"><span class="hljs-keyword"></span> public</span>Object<span class="hljs-title"><span class="hljs-title">Frombody</span></span>(typedinput body, Type Type)<span class="hljs-keyword"><span class="hljs-keyword">throws</span></span>Conversionexception {bytearrayoutputstream BAOs =<span class="hljs-keyword"><span class="hljs-keyword">New</span></span>Bytearrayoutputstream ();<span class="hljs-keyword"><span class="hljs-keyword">int</span></span>I =-<span class="hljs-number"><span class="hljs-number">1</span></span>; String response =<span class="hljs-string"><span class="hljs-string">""</span></span>;<span class="hljs-keyword"><span class="hljs-keyword">Try</span></span>{<span class="hljs-keyword"><span class="hljs-keyword"></span> while</span>((i = body.in (). Read ())! =-<span class="hljs-number"><span class="hljs-number">1</span></span>) {baos.write (i); } response = Baos.tostring (); Baos.close (); }<span class="hljs-keyword"><span class="hljs-keyword">Catch</span></span>(ioexception E) {e.printstacktrace (); }<span class="hljs-keyword"><span class="hljs-keyword">return</span></span>Response }<span class="hljs-annotation"><span class="hljs-annotation">@Override</span></span> <span class="hljs-keyword"><span class="hljs-keyword"></span> public</span>Typedoutput<span class="hljs-title"><span class="hljs-title">Tobody</span></span>(<span class="hljs-keyword"><span class="hljs-keyword">Final</span></span>Object Object) {<span class="hljs-keyword"><span class="hljs-keyword">return</span></span> <span class="hljs-keyword"><span class="hljs-keyword">New</span></span>Typedoutput () {<span class="hljs-annotation"><span class="hljs-annotation">@Override</span></span> <span class="hljs-keyword"><span class="hljs-keyword"></span> public</span>String<span class="hljs-title"><span class="hljs-title">FileName</span></span>() {<span class="hljs-keyword"><span class="hljs-keyword">return</span></span> <span class="hljs-keyword"><span class="hljs-keyword">NULL</span></span>; }<span class="hljs-annotation"><span class="hljs-annotation">@Override</span></span> <span class="hljs-keyword"><span class="hljs-keyword"></span> public</span>String<span class="hljs-title"><span class="hljs-title">MimeType</span></span>() {<span class="hljs-keyword"><span class="hljs-keyword">return</span></span> <span class="hljs-string"><span class="hljs-string">"String"</span></span>; }<span class="hljs-annotation"><span class="hljs-annotation">@Override</span></span> <span class="hljs-keyword"><span class="hljs-keyword"></span> public</span> <span class="hljs-keyword"><span class="hljs-keyword">Long</span></span> <span class="hljs-title"><span class="hljs-title">length</span></span>() {<span class="hljs-keyword"><span class="hljs-keyword">return</span></span>Object = =<span class="hljs-keyword"><span class="hljs-keyword">NULL</span></span>?<span class="hljs-number"><span class="hljs-number">0</span></span>: object.tostring (). Length (); }<span class="hljs-annotation"><span class="hljs-annotation">@Override</span></span> <span class="hljs-keyword"><span class="hljs-keyword"></span> public</span> <span class="hljs-keyword"><span class="hljs-keyword">void</span></span> <span class="hljs-title"><span class="hljs-title">WriteTo</span></span>(outputstream Out)<span class="hljs-keyword"><span class="hljs-keyword">throws</span></span>IOException {out.write (object.tostring (). getBytes ()); } }; }}</code></pre><p><p>When a Restadapter object is obtained, call the Create method of Restadapter to get the implementation class of the user Interface.</p></p><pre class="prettyprint"><pre class="prettyprint"><code class=" hljs java"> <span class="hljs-keyword">new</span> Callback<String>() { <span class="hljs-annotation">@Override</span> <span class="hljs-keyword">public</span><span class="hljs-keyword">void</span><span class="hljs-title">success</span>(String s, Response response) { } <span class="hljs-annotation">@Override</span> <span class="hljs-keyword">public</span><span class="hljs-keyword">void</span><span class="hljs-title">failure</span>(RetrofitError error) { } } User user = getAdapter().create(User.class); <span class="hljs-comment">//指定请求参数和回调接口的实现类</span> user.getUsers(<span class="hljs-number">12</span>,callback);</code></pre></pre> <ul> <ul> <li>The strength of retrofit is that it gives the interface a method annotation based on the interface</li> </ul> </ul>Code obfuscation<p><p>If you need code obfuscation, configure the following</p></p><pre class="prettyprint"><pre class="prettyprint"><code class=" hljs haml">-<span class="ruby">dontwarn retrofit.**</span>-<span class="ruby">keep <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">retrofit</span>.** { *;</span> }</span>-<span class="ruby">keepattributes <span class="hljs-constant">Signature</span></span>-<span class="ruby">keepattributes <span class="hljs-constant">Exceptions</span></span></code></pre></pre> <p><p>Use retrofit for network requests under Android Studio</p></p></span>