2. 程式人生 > >使用Retrofit和Rxjava讓你的網路請求更簡單

使用Retrofit和Rxjava讓你的網路請求更簡單

阿新 • • 發佈：2019-01-31 
去年的時候好多公司就已經使用Rxjava和Retrofit了，最近自自己學習了一下，感覺真的是很好用，讓自己的網路請求變得更簡單了，而且封裝性極強。
首先做一下準備工作，匯入需要引用的檔案

compile 'com.android.support:appcompat-v7:25.1.0'
    testCompile 'junit:junit:4.12'
    compile 'io.reactivex:rxjava:1.1.0'
    compile 'io.reactivex:rxandroid:1.1.0'
    compile 'com.squareup.retrofit2:retrofit:2.0.0-beta4'
 

    compile 'com.squareup.retrofit2:converter-gson:2.0.0-beta4'
    compile 'com.squareup.retrofit2:adapter-rxjava:2.0.0-beta4'
    compile 'com.google.code.gson:gson:2.6.2'
    compile 'com.jakewharton:butterknife:7.0.1'
    compile 'com.android.support:recyclerview-v7:25.1.0'
網路請求的地址：https://api.douban.com/v2/movie/top250?start=0&count=10
新增網路請求許可權

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

首先看一下Retrofit的使用基本用法
  1. 建立一個介面類MovieService 對網路介面進行請求這裡寫程式碼片
  2. 構建網路請求
public interface MovieService {
    @GET("top250")
    Call<MovieBean> getTopMovie(@Query("start")int start, @Query("count")int count);
}
String baseUrl="https://api.douban.com/v2/movie/"
 
;
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(baseUrl)
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
               .build();
        MovieService service = retrofit.create(MovieService.class);
        service.getTopMovie(0,10)
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Subscriber<MovieBean>() {
                    @Override
                    public void onCompleted() {
                        Toast.makeText(MainActivity.this, "Get Top Movie Completed", Toast.LENGTH_SHORT).show();
                    }

                    @Override
                    public void onError(Throwable e) {
                        resultTV.setText(e.getMessage());
                    }

                    @Override
                    public void onNext(MovieBean movieBean) {
                        resultTV.setText(movieBean.getTitle());
                    }
                });
        Call<MovieBean> call = service.getTopMovie(0, 10);
       call.enqueue(new Callback<MovieBean>() {
            @Override
            public void onResponse(Call<MovieBean> call, Response<MovieBean> response) {
                MovieBean body = response.body();
                resultTV.setText(response.body().getTitle());
                System.out.println("成功"+response.body().getCount());
            }

            @Override
            public void onFailure(Call<MovieBean> call, Throwable t) {
                resultTV.setText(t.getMessage());
            }
        });
現在看看我們的佈局檔案MainActivity的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:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="ledon.com.retrofitdemo.MainActivity">

    <Button
        android:id="@+id/click_me_BN"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:padding="5dp"
        android:text="獲取資料"
        android:textSize="16sp"/>
    <ListView
        android:id="@+id/result_TV"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@id/click_me_BN"
        android:textSize="16sp"/>
</RelativeLayout>

接下來就看看怎麼樣和RxJava的完美結合了。
首先改造一下MovieService這個介面

public interface MovieService {
    @GET("top250")
    Observable<MovieBean> getTopMovie(@Query("start")int start, @Query("count")int count);
}
然後看一下我們需要建立一個HttpMethods關於一個http的請求方法

package ledon.com.retrofitdemo.api;

import java.util.List;
import java.util.concurrent.TimeUnit;

import javax.security.auth.Subject;

import ledon.com.retrofitdemo.MovieBean;
import okhttp3.OkHttpClient;
import retrofit2.Retrofit;
import retrofit2.adapter.rxjava.RxJavaCallAdapterFactory;
import retrofit2.converter.gson.GsonConverterFactory;
import rx.Subscriber;
import rx.android.schedulers.AndroidSchedulers;
import rx.functions.Func1;
import rx.schedulers.Schedulers;

/**
 * Created by Administrator on 2017/3/9.
 */

public class HttpMethods {
    public static final String BASE_URL="https://api.douban.com/v2/movie/";
    private static final int DEFAULT_TIMEOUT=5;
    private Retrofit retrofit;
    private MovieService movieService;
    //私有化構造方法
    private HttpMethods(){
        //手動建立一個okhttpClient並設定超時時間
        OkHttpClient.Builder builder = new OkHttpClient.Builder();
        builder.connectTimeout(DEFAULT_TIMEOUT, TimeUnit.SECONDS);
        retrofit=new Retrofit.Builder()
                .client(builder.build())
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .baseUrl(BASE_URL)
                .build();
        movieService = retrofit.create(MovieService.class);


    }
    //在訪問httpmethods時候建立單例
    private static class SingletonHolder{
        private static final HttpMethods INSTANCE=new HttpMethods();
    }
     //獲取單例
    public static HttpMethods getInstance(){
        return SingletonHolder.INSTANCE;
    }
    public void getTopMovie(Subscriber<MovieBean>subscriber, int start, int count){
       movieService.getTopMovie(start, count)
                .subscribeOn(Schedulers.io())
                .unsubscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(subscriber);

    }

}

so，很簡單，我們的結合之路已經完成，另附原始碼

package ledon.com.retrofitdemo;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.widget.Button;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.Toast;

import java.util.List;

import butterknife.Bind;
import butterknife.ButterKnife;
import butterknife.OnClick;
import ledon.com.retrofitdemo.adapter.MovieAdapter;
import ledon.com.retrofitdemo.api.HttpMethods;
import rx.Subscriber;

public class MainActivity extends AppCompatActivity {



    @Bind(R.id.click_me_BN)
    Button clickMeBN;
    @Bind(R.id.result_TV)
    ListView resultTV;
    @Bind(R.id.activity_main)
    RelativeLayout activityMain;
    private Subscriber<MovieBean> subscriber;
    private List<MovieBean.SubjectsBean> list;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

        //resultTV.setAdapter();

    }


    //進行網路請求
    private void getMovie() {
        subscriber = new Subscriber<MovieBean>() {
            @Override
            public void onCompleted() {
                Toast.makeText(MainActivity.this, "Get Top Movie Completed", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onError(Throwable e) {
                //resultTV.setText(e.getMessage());
            }

            @Override
            public void onNext(MovieBean movieBean) {
               // List<MovieBean.SubjectsBean> subjects = movieBean.getSubjects();
                list=movieBean.getSubjects();
                MovieAdapter movieAdapter=new MovieAdapter(MainActivity.this,list);
                resultTV.setAdapter(movieAdapter);
                //resultTV.setText(movieBean.getTitle());
            }
        };
        HttpMethods.getInstance().getTopMovie(subscriber, 0, 10);
       /* String baseUrl="https://api.douban.com/v2/movie/";
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(baseUrl)
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
               .build();
        MovieService service = retrofit.create(MovieService.class);
        service.getTopMovie(0,10)
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Subscriber<MovieBean>() {
                    @Override
                    public void onCompleted() {
                        Toast.makeText(MainActivity.this, "Get Top Movie Completed", Toast.LENGTH_SHORT).show();
                    }

                    @Override
                    public void onError(Throwable e) {
                        resultTV.setText(e.getMessage());
                    }

                    @Override
                    public void onNext(MovieBean movieBean) {
                        resultTV.setText(movieBean.getTitle());
                    }
                });*/
        //Call<MovieBean> call = service.getTopMovie(0, 10);
       /* call.enqueue(new Callback<MovieBean>() {
            @Override
            public void onResponse(Call<MovieBean> call, Response<MovieBean> response) {
                MovieBean body = response.body();
                resultTV.setText(response.body().getTitle());
                System.out.println("成功"+response.body().getCount());
            }

            @Override
            public void onFailure(Call<MovieBean> call, Throwable t) {
                resultTV.setText(t.getMessage());
            }
        });*/
    }

    @OnClick(R.id.click_me_BN)
    public void onClick() {
        getMovie();
    }

}

package ledon.com.retrofitdemo;

import java.util.List;

/**
 * Created by Administrator on 2017/3/9.
 */

public class MovieBean {

    /**
     * count : 10
     * start : 0
     * total : 250
     * subjects : [{"rating":{"max":10,"average":9.6,"stars":"50","min":0},"genres":["犯罪","劇情"],"title":"肖申克的救贖","casts":[{"alt":"https://movie.douban.com/celebrity/1054521/","avatars":{"small":"https://img3.doubanio.com/img/celebrity/small/17525.jpg","large":"https://img3.doubanio.com/img/celebrity/large/17525.jpg","medium":"https://img3.doubanio.com/img/celebrity/medium/17525.jpg"},"name":"蒂姆·羅賓斯","id":"1054521"},{"alt":"https://movie.douban.com/celebrity/1054534/","avatars":{"small":"https://img3.doubanio.com/img/celebrity/small/34642.jpg","large":"https://img3.doubanio.com/img/celebrity/large/34642.jpg","medium":"https://img3.doubanio.com/img/celebrity/medium/34642.jpg"},"name":"摩根·弗里曼","id":"1054534"},{"alt":"https://movie.douban.com/celebrity/1041179/","avatars":{"small":"https://img1.doubanio.com/img/celebrity/small/5837.jpg","large":"https://img1.doubanio.com/img/celebrity/large/5837.jpg","medium":"https://img1.doubanio.com/img/celebrity/medium/5837.jpg"},"name":"鮑勃·岡頓","id":"1041179"}],"collect_count":1036030,"original_title":"The Shawshank Redemption","subtype":"movie","directors":[{"alt":"https://movie.douban.com/celebrity/1047973/","avatars":{"small":"https://img3.doubanio.com/img/celebrity/small/230.jpg","large":"https://img3.doubanio.com/img/celebrity/large/230.jpg","medium":"https://img3.doubanio.com/img/celebrity/medium/230.jpg"},"name":"弗蘭克·德拉邦特","id":"1047973"}],"year":"1994","images":{"small":"https://img3.doubanio.com/view/movie_poster_cover/ipst/public/p480747492.jpg","large":"https://img3.doubanio.com/view/movie_poster_cover/lpst/public/p480747492.jpg","medium":"https://img3.doubanio.com/view/movie_poster_cover/spst/public/p480747492.jpg"},"alt":"https://movie.douban.com/subject/1292052/","id":"1292052"},{"rating":{"max":10,"average":9.4,"stars":"50","min":0},"genres":["劇情","動作","犯罪"],"title":"這個殺手不太冷","casts":[{"alt":"https://movie.douban.com/celebrity/1025182/","avatars":{"small":"https://img3.doubanio.com/img/celebrity/small/8833.jpg","large":"https://img3.doubanio.com/img/celebrity/large/8833.jpg","medium":"https://img3.doubanio.com/img/celebrity/medium/8833.jpg"},"name":"讓·雷諾","id":"1025182"},{"alt":"https://movie.douban.com/celebrity/1054454/","avatars":{"small":"https://img3.doubanio.com/img/celebrity/small/2274.jpg","large":"https://img3.doubanio.com/img/celebrity/large/2274.jpg","medium":"https://img3.doubanio.com/img/celebrity/medium/2274.jpg"},"name":"娜塔莉·波特曼","id":"1054454"},{"alt":"https://movie.douban.com/celebrity/1010507/","avatars":{"small":"https://img3.doubanio.com/img/celebrity/small/104.jpg","large":"https://img3.doubanio.com/img/celebrity/large/104.jpg","medium":"https://img3.doubanio.com/img/celebrity/medium/104.jpg"},"name":"加里·奧德曼","id":"1010507"}],"collect_count":1002125,"original_title":"Léon","subtype":"movie","directors":[{"alt":"https://movie.douban.com/celebrity/1031876/","avatars":{"small":"https://img3.doubanio.com/img/celebrity/small/33301.jpg","large":"https://img3.doubanio.com/img/celebrity/large/33301.jpg","medium":"https://img3.doubanio.com/img/celebrity/medium/33301.jpg"},"name":"呂克·貝鬆","id":"1031876"}],"year":"1994","images":{"small":"https://img3.doubanio.com/view/movie_poster_cover/ipst/public/p511118051.jpg","large":"https://img3.doubanio.com/view/movie_poster_cover/lpst/public/p511118051.jpg","medium":"https://img3.doubanio.com/view/movie_poster_cover/spst/public/p511118051.jpg"},"alt":"https://movie.douban.com/subject/1295644/","id":"1295644"},{"rating":{"max":10,"average":9.5,"stars":"50","min":0},"genres":["劇情","愛情","同性"],"title":"霸王別姬","casts":[{"alt":"https://movie.douban.com/celebrity/1003494/","avatars":{"small":"https://img1.doubanio.com/img/celebrity/small/67.jpg","large":"https://img1.doubanio.com/img/celebrity/large/67.jpg","medium":"https://img1.doubanio.com/img/celebrity/medium/67.jpg"},"name":"張國榮","id":"1003494"},{"alt":"https://movie.douban.com/celebrity/1050265/","avatars":{"small":"https://img3.doubanio.com/img/celebrity/small/10381.jpg","large":"https://img3.doubanio.com/img/celebrity/large/10381.jpg","medium":"https://img3.doubanio.com/img/celebrity/medium/10381.jpg"},"name":"張豐毅","id":"1050265"},{"alt":"https://movie.douban.com/celebrity/1035641/","avatars":{"small":"https://img1.doubanio.com/img/celebrity/small/1399268395.47.jpg","large":"https://img1.doubanio.com/img/celebrity/large/1399268395.47.jpg","medium":"https://img1.doubanio.com/img/celebrity/medium/1399268395.47.jpg"},"name":"鞏俐","id":"1035641"}],"collect_count":727900,"original_title":"霸王別姬","subtype":"movie","directors":[{"alt":"https://movie.douban.com/celebrity/1023040/","avatars":{"small":"https://img3.doubanio.com/img/celebrity/small/750.jpg","large":"https://img3.doubanio.com/img/celebrity/large/750.jpg","medium":"https://img3.doubanio.com/img/celebrity/medium/750.jpg"},"name":"陳凱歌","id":"1023040"}],"year":"1993","images":{"small":"https://img3.doubanio.com/view/movie_poster_cover/ipst/public/p1910813120.jpg","large":"https://img3.doubanio.com/view/movie_poster_cover/lpst/public/p1910813120.jpg","medium":"https://img3.doubanio.com/view/movie_poster_cover/spst/public/p1910813120.jpg"},"alt":"https://movie.douban.com/subject/1291546/","id":"1291546"},{"rating":{"max":10,"average":9.4,"stars":"50","min":0},"genres":["劇情","愛情"],"title":"阿甘正傳","casts":[{"alt":"https://movie.douban.com/celebrity/1054450/","avatars":{"small":"https://img3.doubanio.com/img/celebrity/small/551.jpg","large":"https://img3.doubanio.com/img/celebrity/large/551.jpg","medium":"https://img3.doubanio.com/img/celebrity/medium/551.jpg"},"name":"湯姆·漢克斯","id":"1054450"},{"alt":"https://movie.douban.com/celebrity/1002676/","avatars":{"small":"https://img1.doubanio.com/img/celebrity/small/51737.jpg","large":"https://img1.doubanio.com/img/celebrity/large/51737.jpg","medium":"https://img1.doubanio.com/img/celebrity/medium/51737.jpg"},"name":"羅賓·懷特","id":"1002676"},{"alt":"https://movie.douban.com/celebrity/1031848/","avatars":{"small":"https://img3.doubanio.com/img/celebrity/small/1345.jpg","large":"https://img3.doubanio.com/img/celebrity/large/1345.jpg","medium":"https://img3.doubanio.com/img/celebrity/medium/1345.jpg"},"name":"加里·西尼斯","id":"1031848"}],"collect_count":895393,"original_title":"Forrest Gump","subtype":"movie","directors":[{"alt":"https://movie.douban.com/celebrity/1053564/","avatars":{"small":"https://img3.doubanio.com/img/celebrity/small/505.jpg","large":"https://img3.doubanio.com/img/celebrity/large/505.jpg","medium":"https://img3.doubanio.com/img/celebrity/medium/505.jpg"},"name":"羅伯特·澤米吉斯","id":"1053564"}],"year":"1994","images":{"small":"https://img1.doubanio.com/view/movie_poster_cover/ipst/public/p510876377.jpg","large":"https://img1.doubanio.com/view/movie_poster_cover/lpst/public/p510876377.jpg","medium":"https://img1.doubanio.com/view/movie_poster_cover/spst/public/p510876377.jpg"},"alt":"https://movie.douban.com/subject/1292720/","id":"1292720"},{"rating":{"max":10,"average":9.5,"stars":"50","min":0},"genres":["劇情","喜劇","愛情"],"title":"美麗人生","casts":[{"alt":"https://movie.douban.com/celebrity/1041004/","avatars":{"small":"https://img3.doubanio.com/img/celebrity/small/26764.jpg","large":"https://img3.doubanio.com/img/celebrity/large/26764.jpg","medium":"https://img3.doubanio.com/img/celebrity/medium/26764.jpg"},"name":"羅伯託·貝尼尼","id":"1041004"},{"alt":"https://movie.douban.com/celebrity/1000375/","avatars":{"small":"https://img1.doubanio.com/img/celebrity/small/9548.jpg","large":"https://img1.doubanio.com/img/celebrity/large/9548.jpg","medium":"https://img1.doubanio.com/img/celebrity/medium/9548.jpg"},"name":"尼可萊塔·布拉斯基","id":"1000375"},{"alt":"https://movie.douban.com/celebrity/1000368/","avatars":{"small":"https://img3.doubanio.com/img/celebrity/small/45590.jpg","large":"https://img3.doubanio.com/img/celebrity/large/45590.jpg","medium":"https://img3.doubanio.com/img/celebrity/medium/45590.jpg"},"name":"喬治·坎塔里尼","id":"1000368"}],"collect_count":493063,"original_title":"La 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