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在Android上用一个简单的GET请求了解Retrofit是怎么用的

发表于 更新于 分类于

http://square.github.io/retrofit/

准备

引入
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compile 'com.squareup.retrofit2:retrofit:2.0.0'
compile 'com.squareup.retrofit2:converter-gson:2.+'

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

协议
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/api/v1/user/login/{name}/{passwd}


Curl
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curl -X GET --header 'Accept: application/json' 'http://192.168.1.219/api/v1/user/login/sam/123'

开始写代码

写一个API接口

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

public interface LoginService {

    @GET("/api/v1/user/login/{name}/{passwd}")
    Call<Login> login(@Path("name") String name , @Path("passwd") String passwd);
}

请求响应的Model

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public class Login {

    private int code;
    private String token;

    @Override
    public String toString() {
        return "LoginDemo{" +
                "code=" + code +
                ", token='" + token + '\'' +
                '}';
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getToken() {
        return token;
    }

    public void setToken(String token) {
        this.token = token;
    }
}

分别使用了同步和异步（推荐异步）

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

import java.io.IOException;

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

public class MainActivity extends AppCompatActivity {

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

        tv = (TextView)findViewById(R.id.tv);

        Retrofit loginRetrofit = new Retrofit.Builder()
                .baseUrl("http://192.168.1.219")
                .addConverterFactory(GsonConverterFactory.create())
                .build();
        LoginService loginService = loginRetrofit.create(LoginService.class);
        final Call<Login> result = loginService.login("sam", "123");

        //同步
        new Thread() {
            @Override
            public void run() {
                super.run();
                try {
                    //result实例只能用一次，clone可以生成另外一个相同的实例
                    //这里是同步执行，不能在UI线程执行
                    Log.e("onCreate: 同步", result.clone().execute().body().toString());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }.start();


        //异步
        result.enqueue(new Callback<Login>() {
            @Override
            public void onResponse(Call<Login> call, Response<Login> response) {
                //Do something with response

                Log.i("onResponse: 异步", "code = " + response.code());
                if (response.body() != null){
                    Log.i("onResponse: 异步", response.body().toString());
                    tv.setText(response.body().toString());
                }
            }

            @Override
            public void onFailure(Call<Login> call, Throwable t) {
                //Do something with failure
                Log.e("onFailure: 异步", t.toString());
            }
        });
    }
}