Android Retrofit和Rxjava的网络请求

2022-06-06 01:28

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Android Retrofit和Rxjava的网络请求

去年的时候好多公司就已经使用Rxjava和Retrofit了，最近自自己学习了一下，感觉真的是很好用，让自己的网络请求变得更简单了，而且封装性极强。

首先做一下准备工作，导入需要引用的文件


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'

网络请求的地址：https://api.douban.com/v2/movie/top250?start=0&count=10

添加网络请求权限


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

首先看一下Retrofit的使用基本用法

创建一个接口类MovieService 对网络接口进行请求这里写代码片

构建网络请求


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());
   }
  });

现在看看我们的布局文件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="获取数据"
  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>

接下来就看看怎么样和RxJava的完美结合了。

首先改造一下MovieService这个接口


public interface MovieService {
 @GET("top250")
 Observable<MovieBean> getTopMovie(@Query("start")int start, @Query("count")int count);
}

然后看一下我们需要创建一个HttpMethods关于一个http的请求方法


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;

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;
 //私有化构造方法
 private HttpMethods(){
  //手动创建一个okhttpClient并设置超时时间
  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);
 }
 //在访问httpmethods时候创建单例
 private static class SingletonHolder{
  private static final HttpMethods INSTANCE=new HttpMethods();
 }
  //获取单例
 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，很简单，我们的结合之路已经完成，另附源代码


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();
 }
 //进行网络请求
 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);
  
  //Call<MovieBean> call = service.getTopMovie(0, 10);
  
 }
 @OnClick(R.id.click_me_BN)
 public void onClick() {
  getMovie();
 }
}


package ledon.com.retrofitdemo;
import java.util.List;

public class MovieBean {
 
 private int count;
 private int start;
 private int total;
 private String title;
 private List<SubjectsBean> subjects;
 public int getCount() {
  return count;
 }
 public void setCount(int count) {
  this.count = count;
 }
 public int getStart() {
  return start;
 }
 public void setStart(int start) {
  this.start = start;
 }
 public int getTotal() {
  return total;
 }
 public void setTotal(int total) {
  this.total = total;
 }
 public String getTitle() {
  return title;
 }
 public void setTitle(String title) {
  this.title = title;
 }
 public List<SubjectsBean> getSubjects() {
  return subjects;
 }
 public void setSubjects(List<SubjectsBean> subjects) {
  this.subjects = subjects;
 }
 public static class SubjectsBean {
  
  private RatingBean rating;
  private String title;
  private int collect_count;
  private String original_title;
  private String subtype;
  private String year;
  private ImagesBean images;
  private String alt;
  private String id;
  private List<String> genres;
  private List<CastsBean> casts;
  private List<DirectorsBean> directors;
  public RatingBean getRating() {
   return rating;
  }
  public void setRating(RatingBean rating) {
   this.rating = rating;
  }
  public String getTitle() {
   return title;
  }
  public void setTitle(String title) {
   this.title = title;
  }
  public int getCollect_count() {
   return collect_count;
  }
  public void setCollect_count(int collect_count) {
   this.collect_count = collect_count;
  }
  public String getOriginal_title() {
   return original_title;
  }
  public void setOriginal_title(String original_title) {
   this.original_title = original_title;
  }
  public String getSubtype() {
   return subtype;
  }
  public void setSubtype(String subtype) {
   this.subtype = subtype;
  }
  public String getYear() {
   return year;
  }
  public void setYear(String year) {
   this.year = year;
  }
  public ImagesBean getImages() {
   return images;
  }
  public void setImages(ImagesBean images) {
   this.images = images;
  }
  public String getAlt() {
   return alt;
  }
  public void setAlt(String alt) {
   this.alt = alt;
  }
  public String getId() {
   return id;
  }
  public void setId(String id) {
   this.id = id;
  }
  public List<String> getGenres() {
   return genres;
  }
  public void setGenres(List<String> genres) {
   this.genres = genres;
  }
  public List<CastsBean> getCasts() {
   return casts;
  }
  public void setCasts(List<CastsBean> casts) {
   this.casts = casts;
  }
  public List<DirectorsBean> getDirectors() {
   return directors;
  }
  public void setDirectors(List<DirectorsBean> directors) {
   this.directors = directors;
  }
  public static class RatingBean {
   
   private int max;
   private double average;
   private String stars;
   private int min;
   public int getMax() {
    return max;
   }
   public void setMax(int max) {
    this.max = max;
   }
   public double getAverage() {
    return average;
   }
   public void setAverage(double average) {
    this.average = average;
   }
   public String getStars() {
    return stars;
   }
   public void setStars(String stars) {
    this.stars = stars;
   }
   public int getMin() {
    return min;
   }
   public void setMin(int min) {
    this.min = min;
   }
  }
  public static class ImagesBean {
   
   private String small;
   private String large;
   private String medium;
   public String getSmall() {
    return small;
   }
   public void setSmall(String small) {
    this.small = small;
   }
   public String getLarge() {
    return large;
   }
   public void setLarge(String large) {
    this.large = large;
   }
   public String getMedium() {
    return medium;
   }
   public void setMedium(String medium) {
    this.medium = medium;
   }
  }
  public static class CastsBean {
   
   private String alt;
   private AvatarsBean avatars;
   private String name;
   private String id;
   public String getAlt() {
    return alt;
   }
   public void setAlt(String alt) {
    this.alt = alt;
   }
   public AvatarsBean getAvatars() {
    return avatars;
   }
   public void setAvatars(AvatarsBean avatars) {
    this.avatars = avatars;
   }
   public String getName() {
    return name;
   }
   public void setName(String name) {
    this.name = name;
   }
   public String getId() {
    return id;
   }
   public void setId(String id) {
    this.id = id;
   }
   public static class AvatarsBean {
    
    private String small;
    private String large;
    private String medium;
    public String getSmall() {
     return small;
    }
    public void setSmall(String small) {
     this.small = small;
    }
    public String getLarge() {
     return large;
    }
    public void setLarge(String large) {
     this.large = large;
    }
    public String getMedium() {
     return medium;
    }
    public void setMedium(String medium) {
     this.medium = medium;
    }
   }
  }
  public static class DirectorsBean {
   
   private String alt;
   private AvatarsBeanX avatars;
   private String name;
   private String id;
   public String getAlt() {
    return alt;
   }
   public void setAlt(String alt) {
    this.alt = alt;
   }
   public AvatarsBeanX getAvatars() {
    return avatars;
   }
   public void setAvatars(AvatarsBeanX avatars) {
    this.avatars = avatars;
   }
   public String getName() {
    return name;
   }
   public void setName(String name) {
    this.name = name;
   }
   public String getId() {
    return id;
   }
   public void setId(String id) {
    this.id = id;
   }
   public static class AvatarsBeanX {
    
    private String small;
    private String large;
    private String medium;
    public String getSmall() {
     return small;
    }
    public void setSmall(String small) {
     this.small = small;
    }
    public String getLarge() {
     return large;
    }
    public void setLarge(String large) {
     this.large = large;
    }
    public String getMedium() {
     return medium;
    }
    public void setMedium(String medium) {
     this.medium = medium;
    }
   }
  }
 }
}


package ledon.com.retrofitdemo.adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import java.util.List;
import ledon.com.retrofitdemo.MovieBean;
import ledon.com.retrofitdemo.R;

public class MovieAdapter extends BaseAdapter {
 private Context context;
 private List<MovieBean.SubjectsBean> lists;
 public MovieAdapter(Context context, List<MovieBean.SubjectsBean> lists) {
  this.context = context;
  this.lists = lists;
 }
 @Override
 public int getCount() {
  System.out.println("集合大小："+lists.size());
  return lists.size();
 }
 @Override
 public Object getItem(int i) {
  return null;
 }
 @Override
 public long getItemId(int i) {
  return 0;
 }
 @Override
 public View getView(int i, View convertView, ViewGroup viewGroup) {
  ViewHolder holder;
  if (convertView==null){
   convertView = LayoutInflater.from(context).inflate(R.layout.item, null);
   holder=new ViewHolder();
   holder.tv_title= (TextView) convertView.findViewById(R.id.tv_title);
   holder.tv_name= (TextView) convertView.findViewById(R.id.tv_name);
   convertView.setTag(holder);
  }else {
   holder= (ViewHolder) convertView.getTag();
  }
  //MovieBean.SubjectsBean subjectsBean = lists.get(i).getSubjects().get(i);
  holder.tv_title.setText(lists.get(i).getTitle());
//  holder.tv_name.setText(lists.get(i).getCasts().get(i).getName());
  return convertView;
 }
 static class ViewHolder{
  TextView tv_title;
  TextView tv_name;
 }
}


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;

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;
 //私有化构造方法
 private HttpMethods(){
  //手动创建一个okhttpClient并设置超时时间
  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);
 }
 //在访问httpmethods时候创建单例
 private static class SingletonHolder{
  private static final HttpMethods INSTANCE=new HttpMethods();
 }
  //获取单例
 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);
  
 }
 private class HttpResultFunc<T> implements Func1<HttpResult<T>,T>{
  @Override
  public T call(HttpResult<T> httpResult) {
   return httpResult.getSubjects();
  }
 }
}


package ledon.com.retrofitdemo.api;
import ledon.com.retrofitdemo.MovieBean;
import retrofit2.Call;
import retrofit2.http.GET;
import retrofit2.http.Query;
import rx.Observable;

public interface MovieService {
 @GET("top250")
 Observable<MovieBean> getTopMovie(@Query("start")int start, @Query("count")int count);
}


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical">
 <TextView
  android:layout_gravity="center"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:id="@+id/tv_title"
  android:textSize="20dp"
  android:text="这个杀手不太冷"/>
 <ImageView
  android:layout_gravity="center"
  android:id="@+id/iv"
  android:layout_width="100dp"
  android:layout_height="100dp"
  android:class="lazy" data-src="@mipmap/ic_launcher"/>
<TextView
 android:id="@+id/tv_name"
 android:layout_gravity="center"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:textSize="20dp"
 android:text="主演：呵呵哈哈哈"/>
</LinearLayout>

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