retrofit2
Retrofit2是基于OkHttp的网络请求框架，通过注解的方式配置请求。
参考教程
首先自己写个网站页面info.php，简单的php，返回json格式字符串：
开启phpstudy后访问本机ip.info.php时页面上会显示{ "Employees": [ { "FirstName":"Bill" , "LastName":"Gates" }, { "FirstName":"George" , "LastName":"Bush" }, { "FirstName":"Thomas" , "LastName":"Carter" } ] }
android工程中添加依赖：
compile 'com.squareup.retrofit2:retrofit:2.1.0'
compile 'com.squareup.retrofit2:converter-gson:2.1.0' //解析gson
首先定义接口
public interface Emp {
@GET("info.php") //http使用get方法
Call getinfo(); //定义getinfo方法，若有参数可在圆括号内添加如下形式的参数：@Query("city") String city，即访问“ip.info.php?city=值”。返回值为Emplinfo类型，等会儿写
}
然后定义 Emplinfo类，####变量名需要和json里的名字相同↓↓↓####：
public class Emplinfo{
private List Employees; //就是这里
public List getEmployees() {
return Employees;
}
public void setEmployees(List employees) {
Employees = employees;
}
}
接着是Employee类，get和set省略了：
public class Employee{
private String FirstName;
private String LastName;
。。。
}
然后：
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("http://********") //自己的ip
.addConverterFactory(GsonConverterFactory.create()) //设置 Json 转换器
.build();
Emp emp=retrofit.create(Emp.class); //新建一个自定义的类的实例
Call call = emp.getinfo(); //新建getinfo方法实例
call.enqueue(new Callback() { //执行，重写成功和失败方法
@Override
public void onResponse(Call call, Response response) {
L.json(response.body().getEmployees()); //得到Employee数组
}
@Override
public void onFailure(Call call, Throwable t) {
Log.d(TAG, "Throwable : " + t);
}
});
- 题外话，这里发现了https://github.com/fengzhizi715/SAF-Kotlin-log这个开源库打印日志挺好使的，logger打印自定义类还得重写tostring，这个
L.json()挺清晰，就是首字母大小写有点问题。
然后看rxjava和retrofit结合
修改接口
public interface Emp {
@GET("info.php")
Observable getinfo();
}
还需要添加一个依赖，如果不添加会用rxjava的适配器而不是rxjava2的，不会提示语法错误，但是运行会报错空指针：
implementation 'com.squareup.retrofit2:adapter-rxjava2:2.4.0'
请求改成如下：
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("http://cyp.natapp1.cc/")//基础URL 建议以 / 结尾
.addConverterFactory(GsonConverterFactory.create())//设置 Json 转换器
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())//RxJava 适配器 //新添加
.build();
Emp emp=retrofit.create(Emp.class);
emp.getinfo().observeOn(AndroidSchedulers.mainThread()) //指定observer的回调方法运行在主线程
.subscribeOn(Schedulers.io()) //运行在io线程
.subscribe(new Observer() {
@Override
public void onSubscribe(Disposable d) {
L.d("onsubscribe");
}
@Override
public void onNext(Emplinfo emplinfo) {
L.json(emplinfo);
}
@Override
public void onError(Throwable e) {
L.d("onerror"+e.getMessage());
}
@Override
public void onComplete() {
L.d("oncomplete");
}
});
成功输出。
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ╔══════════════════════════════════════════════════════════════════════════════════════════════════
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ║ Thread: main
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ╟──────────────────────────────────────────────────────────────────────────────────────────────────
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ║ com.safframework.log.handler.ObjectHandler.handle (ObjectHandler.kt:16)
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ╟──────────────────────────────────────────────────────────────────────────────────────────────────
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ║ class com.example.myapplication.Test1$Emplinfo
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ║ {
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ║ "employees": [
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ║ {
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ║ "firstName": "Bill",
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ║ "lastName": "Gates"
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ║ },
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ║ {
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ║ "firstName": "George",
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ║ "lastName": "Bush"
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ║ },
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ║ {
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ║ "firstName": "Thomas",
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ║ "lastName": "Carter"
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ║ }
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ║ ]
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ║ }
06-26 09:15:27.410 3633-3633/com.example.myapplication I/System.out: ╚══════════════════════════════════════════════════════════════════════════════════════════════════