android_retrofit的使用(GET)

基本上跟之前写的okhttpUtils加fastJson差不多

okhttpUtils和retrofit都是对于okhttp的封装

但是retrofit和okhttp都是Square开源的轻量级框架

gradle：

compile 'com.squareup.okhttp3:okhttp:3.1.2'
compile 'com.squareup.retrofit2:retrofit:2.0.2'
//这俩是关键 retrofit的使用


compile 'com.squareup.retrofit2:converter-gson:2.0.2'//gson  也可以了解一下fastJson
compile 'com.android.support:design:26.0.0-alpha1'//材料设计语言 recyclerView时用到
compile 'com.zhy:base-rvadapter:3.0.3'//万能适配器
compile 'com.github.bumptech.glide:glide:3.7.0'//网络图片加载
compile 'com.scwang.smartrefresh:SmartRefreshLayout:1.0.3'//刷新

http://www.imooc.com/api/teacher?type=4&num=10 //json数据

效果图

layout:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_retrofit"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.iamchan.allfunctiontest.RetrofitActivity">
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    <com.scwang.smartrefresh.layout.SmartRefreshLayout
        android:id="@+id/smart"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyc"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </android.support.v7.widget.RecyclerView>
    </com.scwang.smartrefresh.layout.SmartRefreshLayout>
    </LinearLayout>
</RelativeLayout>

item:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <LinearLayout
        android:paddingLeft="16dp"
        android:paddingRight="16dp"
        android:paddingTop="10dp"
        android:paddingBottom="10dp"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="100dp">
        <ImageView
            android:id="@+id/img"
            android:layout_width="100dp"
            android:layout_height="match_parent" />
        <LinearLayout
            android:layout_marginLeft="5dp"
            android:orientation="vertical"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="match_parent">
            <TextView
                android:id="@+id/name"
                android:maxLines="1"
                android:layout_weight="1"
                android:textStyle="bold"
                android:textSize="20sp"
                android:layout_width="match_parent"
                android:layout_height="0dp" />
            <TextView
                android:id="@+id/content"
                android:maxLines="2"
                android:textSize="18sp"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />
        </LinearLayout>
    </LinearLayout>
    <View
        android:background="#f5f5f5"
        android:layout_width="match_parent"
        android:layout_height="2dp"></View>
</LinearLayout>

json数据格式：

{
   "status": 1,
   "data": [{
       "id": 1,
       "name": "Tony老师聊shell——环境变量配置文件",
       "picSmall": "http:\/\/img.mukewang.com\/55237dcc0001128c06000338-300-170.jpg",
       "picBig": "http:\/\/img.mukewang.com\/55237dcc0001128c06000338.jpg",
       "description": "为你带来shell中的环境变量配置文件",
       "learner": 12312
   }],
   "msg": "成功"
}

实体类;

最外层

属性与与json格式对应

可以简单理解见着{}就是class

见着【】就是list 可以参照之前写的fastjson

public class Teacher {

    private int status;
    private String msg;
    private List<Course> data;


    public Teacher() {
    }

    public Teacher(int status, String msg, List<Course> data) {
        this.status = status;
        this.msg = msg;
        this.data = data;
    }

    public int getStatus() {
        return status;
    }

    public void setStatus(int status) {
        this.status = status;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public List<Course> getData() {
        return data;
    }

    public void setData(List<Course> data) {
        this.data = data;
    }


}

里层

属性与json数据对应

public class Course {

    private int id;
    private String name;
    private String picSmall;
    private String picBig;
    private String description;
    private int learner;


    public Course() {
    }

    public Course(int id, String name, String picSmall, String picBig, String description, int learner) {
        this.id = id;
        this.name = name;
        this.picSmall = picSmall;
        this.picBig = picBig;
        this.description = description;
        this.learner = learner;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPicSmall() {
        return picSmall;
    }

    public void setPicSmall(String picSmall) {
        this.picSmall = picSmall;
    }

    public String getPicBig() {
        return picBig;
    }

    public void setPicBig(String picBig) {
        this.picBig = picBig;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public int getLearner() {
        return learner;
    }

    public void setLearner(int learner) {
        this.learner = learner;
    }

}

接口：

使用retrofit需要定义接口

这个接口主要有两个东西一个是get请求（）中是什么 http://www.imooc.com/api/teacher?type=4&num=10

下面是一个方法 getCall()方法里面有参数参数是什么 http://www.imooc.com/api/teacher?type=4&num=10

retrofit采用注释的形式

public interface IRequest {
    @GET("api/teacher")/*api/teacher?type=4&num=10*/
         Call<Teacher> getCall(@Query("type") String type, @Query("num")String num);
}

java代码

 private RecyclerView recyc;
    private CommonAdapter comm;
    private List<Course> courseList;
    private SmartRefreshLayout smart;
    private int type=4;
    private int num=10;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_retrofit);
        recyc= (RecyclerView) findViewById(R.id.recyc);
        smart= (SmartRefreshLayout) findViewById(R.id.smart);
        initRecyc();
        request();
    }

    private void initRecyc() {


        courseList=new ArrayList<>();
        comm=new CommonAdapter(RetrofitActivity.this,R.layout.item,courseList) {
            @Override
            protected void convert(ViewHolder holder, Object o, int position) {
                Glide.with(RetrofitActivity.this).load(courseList.get(position).getPicSmall()).centerCrop().into((ImageView) holder.getView(R.id.img));
                holder.setText(R.id.name,courseList.get(position).getName());
                holder.setText(R.id.content,courseList.get(position).getDescription());

            }
        };
        recyc.setAdapter(comm);
        LinearLayoutManager lin=new LinearLayoutManager(this);
        lin.setOrientation(LinearLayoutManager.VERTICAL);
        recyc.setLayoutManager(lin);



        smart.setEnableRefresh(false);
        smart.setOnLoadmoreListener(new OnLoadmoreListener() {
            @Override
            public void onLoadmore(RefreshLayout refreshlayout) {
                num+=10;
                courseList.clear();
                request();
                smart.finishLoadmore();
            }
        });


    }

    private void request() {

        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl("http://www.imooc.com/") // 设置网络请求 Url
                .addConverterFactory(GsonConverterFactory.create()) //设置使用Gson解析(记得加入依赖)
                .build();
        IRequest iRequest=retrofit.create(IRequest.class);
        Call<Teacher> call=iRequest.getCall(type+"",num+""); //这就是方法传进去的参数
        call.enqueue(new Callback<Teacher>() {
            @Override
            public void onResponse(Call<Teacher> call, Response<Teacher> response) {
                List<Course> courses=response.body().getData();
                for(int i=0;i<courses.size();i++){
                    courseList.add(courses.get(i));
                }
                comm.notifyDataSetChanged();
            }
            @Override
            public void onFailure(Call<Teacher> call, Throwable t) {
			//fail时调用
            }
        });
    }
}

android_retrofit的使用(GET)

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