Retrofit简单使用

1. 在 Gradle加入Retrofit库的依赖

dependencies {
    compile 'com.squareup.retrofit2:retrofit:2.0.2'
 // Retrofit库
  

compile 'com.squareup.retrofit2:converter-gson:2.0.2'

 }  2. 添加 网络权限

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>   

3.创建 接收服务器返回数据 的类

//写一个基类

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1. public class BaseResponse<T> {  
2.     public String msg;  
3.     public String code;  
4.     public T data;  
5.   
6. }  

//写一个普通类继承基类 属性根据接口自己定义

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1. public class User extends BaseResponse {  
2.     public String mobile;  
3.     public String nickname;  
4.     public String password;  
5. }  

4.创建用于面熟网络请求的接口,声明各个逻辑的接口

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1. public interface TestService {  
2.     //get请求  
3.     @GET()  
4.     Call<UserInfo> getRetrofit(@Url String uri, @Query("uid") String id);  
5.   
6.     //get请求  
7.     @GET()  
8.     Call<BaseResponse<User>> get2Retrofit(@Url String uri, @QueryMap Map<String,String> map);  
9.   
10.     //post请求  
11.     @POST  
12.     @FormUrlEncoded  
13.     Call<UserInfo> postRetrofit(@Url String uri, @Field("uid") String id);  
14.   
15.     //post请求  
16.     @POST  
17.     @FormUrlEncoded  
18.     Call<UserInfo> post2Retrofit(@Url String uri, @FieldMap Map<String,String> map);  
19. }  

//接口工具类

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1. public class Constants {  
2.     public static String  BASE_url="https://www.zhaoapi.cn/";  
3.     //获取信息  
4.     public static  String Huo_url="user/getUserInfo";  
5.     //获取信息  
6.     public static  String login_url="user/login";  
7. }  

//实际应用

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1. public class MainActivity extends AppCompatActivity {  
2.   
3.     private TestService testService;  
4.   
5.     @Override  
6.     protected void onCreate(Bundle savedInstanceState) {  
7.         super.onCreate(savedInstanceState);  
8.         setContentView(R.layout.activity_main);  
9.         ButterKnife.bind(this);  
10.         //创建retrofit对象  
11.         Retrofit retrofit=new Retrofit.Builder()  
12.                 .baseUrl(Constants.BASE_url)  
13.                 //支持Gson解析,转换成JavaBean类  
14.                 .addConverterFactory(GsonConverterFactory.create())  
15.                 .build();  
16.         //实现接口,通过动态代理实现接口  
17.         testService = retrofit.create(TestService.class);  
18.     }  
19.   
20.     @OnClick({R.id.g1,R.id.g2,R.id.p1,R.id.p2})  
21.     public void btn(View v){  
22.         switch (v.getId()){  
23.             case R.id.g1:  
24.   
25.                 Call<UserInfo> ca = testService.getRetrofit(Constants.Huo_url,"71");  
26.                 ca.enqueue(new Callback<UserInfo>() {  
27.                     @Override  
28.                     public void onResponse(Call<UserInfo> call, Response<UserInfo> response) {  
29.                         //在主线程  
30.                         UserInfo userInfo = response.body();  
31.    Toast.makeText(MainActivity.this,userInfo.getDate().getNickname(),Toast.LENGTH_SHORT).show();  
32.                     }  
33.   
34.                     @Override  
35.                     public void onFailure(Call<UserInfo> call, Throwable t) {  
36.   
37.                     }  
38.                 });  
39.                 break;  
40.             case R.id.g2:  
41.                 Map<String,String> map1=new HashMap<>();  
42.                 map1.put("mobile","15712885679");  
43.                 map1.put("password","123456");  
44.               Call<BaseResponse<User>> call2 = testService.get2Retrofit(Constants.login_url,map1);  
45.                 call2.enqueue(new Callback<BaseResponse<User>>() {  
46.                     @Override  
47.     public void onResponse(Call<BaseResponse<User>> call, Response<BaseResponse<User>> response) {  
48.                         BaseResponse<User> body = response.body();  
49.                         //在主线程  
50.            Toast.makeText(MainActivity.this,body.data.mobile+body.msg,Toast.LENGTH_SHORT).show();  
51.                     }  
52.   
53.                     @Override  
54.                     public void onFailure(Call<BaseResponse<User>> call, Throwable t) {  
55.   
56.                     }  
57.                 });  
58.                 break;  
59.             case R.id.p1:  
60.                 Call<UserInfo> call = testService.postRetrofit(Constants.Huo_url, "71");  
61.                 call.enqueue(new Callback<UserInfo>() {  
62.                     @Override  
63.                     public void onResponse(Call<UserInfo> call, Response<UserInfo> response) {  
64.                         //在主线程  
65.                         UserInfo userInfo = response.body();  
66.    Toast.makeText(MainActivity.this,userInfo.getDate().getNickname(),Toast.LENGTH_SHORT).show();  
67.                     }  
68.   
69.                     @Override  
70.                     public void onFailure(Call<UserInfo> call, Throwable t) {  
71.   
72.                     }  
73.                 });  
74.                 break;  
75.             case R.id.p2:  
76.                 Map<String,String> map=new HashMap<>();  
77.                 map.put("mobile","15712885679");  
78.                 map.put("password","123456");  
79.                 Call<UserInfo> ca2 = testService.post2Retrofit(Constants.login_url, map);  
80.                 ca2.enqueue(new Callback<UserInfo>() {  
81.                     @Override  
82.                     public void onResponse(Call<UserInfo> call, Response<UserInfo> response) {  
83.                         //在主线程  
84.                         UserInfo userInfo = response.body();  
85.    Toast.makeText(MainActivity.this,userInfo.getMsg(),Toast.LENGTH_SHORT).show();  
86.                     }  
87.                     @Override  
88.                     public void onFailure(Call<UserInfo> call, Throwable t) {  
89.   
90.                     }  
91.                 });  
92.                 break;  
93.         }  
94.     }  
95. }