Android Retrofit框架的简单应用

Retrofit：Square提供的开源产品，为Android平台的应用提供一个类型安全的REST客户端

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https://github.com/square/retrofit  

RxAndroid：响应式编程框架RxJava针对Android平台的扩展。

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https://github.com/ReactiveX/RxAndroid   https://github.com/ReactiveX/RxJava  
Dagger2：依赖注入(或叫ioc,用过Spring的都知道这东东)框架，用于解耦的。

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https://github.com/google/dagger/  
通过

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http://ip.taobao.com/service/getIpInfo.php?ip=218.19.99.83
获得json数据

在app的gradle中加入依赖包

compile 'com.squareup.retrofit2:retrofit:2.0.0-beta4'//Retrofit2所需要的包
compile 'com.squareup.retrofit2:converter-gson:2.0.0-beta4'//ConverterFactory的Gson依赖包
compile 'com.squareup.retrofit2:converter-scalars:2.0.0-beta4'//ConverterFactory的String依赖包

在AndroidManifest.xml加入网络访问权限

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

编写API服务

package com.example.xyz.retrofit.Response;

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

/**
* Created by xyz on 2016/9/5.
*/
public interface ApiService {

@GET("service/getIpInfo.php")//请求目录
Call<GetIpInfoResponse>//回调、传入
getIpInfo(@Query("ip") String ip);//url传值key和value

}

定义接受数据的类

GetIpInfoResponse

package com.example.xyz.retrofit.Response;

import com.example.xyz.retrofit.model.IpInfo;

/**
* Created by xyz on 2016/9/5.
*/
public class GetIpInfoResponse {
public int code;
public IpInfo data;
}

IpInfo

package com.example.xyz.retrofit.model;

/**
* Created by xyz on 2016/9/6.
*/
public class IpInfo {
public String country;
public String Country_id;
public String area;
public String area_id;
public String ip;
public String city;
public String isp;

}

activity_main.xml

<?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:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.xyz.retrofit.MainActivity">

<Button
android:id="@+id/b1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tx1"
android:layout_below="@id/b1"
android:text="" />

</RelativeLayout>

MainActivity.java

package com.example.xyz.retrofit;

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

import com.example.xyz.retrofit.Response.ApiService;
import com.example.xyz.retrofit.Response.GetIpInfoResponse;

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

public class MainActivity extends AppCompatActivity {
private Button b1;
private TextView tx1;
private String enpoint="http://ip.taobao.com";
private String ip="218.19.99.83";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

b1=(Button) findViewById(R.id.b1);
tx1=(TextView) findViewById(R.id.tx1);

b1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Retrofit retrofit=new Retrofit.Builder()//实例化retrofit
.baseUrl(enpoint)
.addConverterFactory(GsonConverterFactory.create())//读取GSON
.build();

ApiService apiService=retrofit.create(ApiService.class);//指定retrofit的api服务

Call<GetIpInfoResponse> call=apiService.getIpInfo(ip);
call.enqueue(new Callback<GetIpInfoResponse>() {
@Override
public void onResponse(Call<GetIpInfoResponse> call, Response<GetIpInfoResponse> response) {
GetIpInfoResponse getIpInfoResponse=response.body();//将GSON数据写入GetIpInfoResponse
tx1.setText(getIpInfoResponse.data.country);
tx1.append("，");
tx1.append(getIpInfoResponse.data.area);
tx1.append("，");
tx1.append(getIpInfoResponse.data.city);
tx1.append("，");
tx1.append(getIpInfoResponse.data.isp);
tx1.append("，code="+getIpInfoResponse.code);

}

@Override
public void onFailure(Call<GetIpInfoResponse> call, Throwable t) {
Toast.makeText(getApplicationContext(),t.getMessage(),Toast.LENGTH_SHORT).show();
}
});
}
});

}
}