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
- 建立一個介面類MovieService 對網路介面進行請求
這裡寫程式碼片
- 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 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