Retrofit框架（一）

一、使用Retrofit框架请求网页

一、添加依赖

请见

https://blog.csdn.net/weimeig/article/details/78656178

二、建立接口文件

Service.java

package com.administrator.picassodemo;

import retrofit2.Call;
import retrofit2.http.GET;

/**
 * Created by Administrator on 2018/5/16.
 */

public interface Service {
    @GET("/")//括号内可以不写，也可以写网页的子目录
    Call<String> getBaidu();
}

三、创建实例

MainActivity.java

package com.administrator.picassodemo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

import java.io.IOException;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import okhttp3.ResponseBody;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Converter;
import retrofit2.Response;
import retrofit2.Retrofit;

public class MainActivity extends AppCompatActivity implements Callback<String> {


    private TextView mTextView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mTextView = findViewById(R.id.tvContent);
        //addConverterFactory()解析下载数据
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl("http://qq.com")
                .addConverterFactory(new Converter.Factory() {
                    @Override
                    public Converter<ResponseBody, ?> responseBodyConverter(Type type, Annotation[] annotations, Retrofit retrofit) {
                        return new Converter<ResponseBody, String>() {
                            @Override
                            public String convert(ResponseBody value) throws IOException {
                                return value.string();
                            }
                        };
                    }
                }).build();
        //用实例出来一个Service
        Service service = retrofit.create(Service.class);
        //用直接get出来一个请求
        Call<String> call = service.getBaidu();
//        异步请求
        call.enqueue(this);
    }

//   ------得到两个反馈------
    @Override
    public void onResponse(Call<String> call, Response<String> response) {
        mTextView.setText(response.body());
    }

    @Override
    public void onFailure(Call<String> call, Throwable t) {
        Toast.makeText(this,"请求失败"+call.request().url(),Toast.LENGTH_SHORT).show();
        t.printStackTrace();
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.administrator.picassodemo.MainActivity">


    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <TextView
        android:id="@+id/tvContent"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />
    </ScrollView>


</android.support.constraint.ConstraintLayout>

二、get请求和数据解析

(一)、添加依赖

dependencies {
    compile 'com.squareup.retrofit2:retrofit:2.0.2'
    compile 'com.squareup.retrofit2:converter-gson:2.0.0-beta3'
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.administrator.picassodemo.MainActivity">


    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <TextView
        android:id="@+id/tvContent"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />
    </ScrollView>


</android.support.constraint.ConstraintLayout>

数据实体类

Cook.java

package com.administrator.picassodemo;

import com.google.gson.annotations.SerializedName;

/**
 * Created by Administrator on 2018/5/16.
 */

public class Cook {

    @SerializedName("id")
    private int id;
    @SerializedName("name")
    private String name;
    @SerializedName("food")
    private String food;
    @SerializedName("img")
    private String img;
    @SerializedName("images")
    private String images;
    @SerializedName("description")
    private String description;
    @SerializedName("keywords")
    private String keywords;
    @SerializedName("message")
    private String message;
    @SerializedName("count")
    private int count;
    @SerializedName("fcount")
    private int fcount;
    @SerializedName("rcount")
    private int rcount;

    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 getFood() {
        return food;
    }

    public void setFood(String food) {
        this.food = food;
    }

    public String getImg() {
        return img;
    }

    public void setImg(String img) {
        this.img = img;
    }

    public String getImages() {
        return images;
    }

    public void setImages(String images) {
        this.images = images;
    }

    public String getDescription() {
        return description;
    }

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

    public String getKeywords() {
        return keywords;
    }

    public void setKeywords(String keywords) {
        this.keywords = keywords;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public int getCount() {
        return count;
    }

    public void setCount(int count) {
        this.count = count;
    }

    public int getFcount() {
        return fcount;
    }

    public void setFcount(int fcount) {
        this.fcount = fcount;
    }

    public int getRcount() {
        return rcount;
    }

    public void setRcount(int rcount) {
        this.rcount = rcount;
    }
}

返回的数据有集合数据，所以建立集合数据实体类

Tngou.java

package com.administrator.picassodemo;

import com.google.gson.annotations.SerializedName;

import java.util.List;

/**
 * Created by Administrator on 2018/5/16.
 */

public class Tngou {
    @SerializedName("status")
    private boolean status;
    @SerializedName("total")
    private int total;
    @SerializedName("tngou")
    private List<Cook> list;

    public boolean isStatus() {
        return status;
    }

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

    public int getTotal() {
        return total;
    }

    public void setTotal(int total) {
        this.total = total;
    }

    public List<Cook> getList() {
        return list;
    }

    public void setList(List<Cook> list) {
        this.list = list;
    }
}

建立接口文件

Service.java

package com.administrator.picassodemo;

import retrofit2.Call;
import retrofit2.http.GET;
import retrofit2.http.Query;

/**
 * Created by Administrator on 2018/5/16.
 */

public interface Service {
    @GET("/api/cook/list")//括号内可以不写，也可以写网页的子目录
    Call<Tngou> getList(@Query("id") int id, @Query("page") int page,@Query("rows")  int rows);
}

MainActivity.java

package com.administrator.picassodemo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import java.util.List;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.GsonConverterFactory;
import retrofit2.Response;
import retrofit2.Retrofit;

public class MainActivity extends AppCompatActivity implements Callback<Tngou> {


    private TextView mTextView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mTextView = findViewById(R.id.tvContent);
        //addConverterFactory()解析下载数据
        Retrofit retrofit = new Retrofit.Builder().baseUrl("http://www.tngou.net")
                .addConverterFactory(GsonConverterFactory.create())
                .build();
        Service service = retrofit.create(Service.class);
        Call<Tngou> call = service.getList(0,1,20);
        call.enqueue(this);
    }


    @Override
    public void onResponse(Call<Tngou> call, Response<Tngou> response) {
        List<Cook> list = response.body().getList();
    }

    @Override
    public void onFailure(Call<Tngou> call, Throwable t) {
        t.printStackTrace();
    }
}

Retrofit框架（一）

一、使用Retrofit框架请求网页

二、get请求和数据解析

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