使用Retrofit和Rxjava让你的网络请求更简单
2017-09-20 14:14
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转载自：http://blog.csdn.net/yanglei0917/article/details/60964151，主要是为了记录方法。
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创建一个接口类MovieService 对网络接口进行请求
构建网络请求
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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-v7:25.1.0'1
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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"/>1
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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);
}12
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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());
}
});12
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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>1
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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);
}12
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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;
/**
* 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);
}
}12
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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);
/* 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();
}
}12
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[/code]
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","剧情"],"title":"肖申克的救赎","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·罗宾斯","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":"鲍勃·冈顿","id":"1041179"}],"collect_count":1036030,"original_title":"The Shawshank 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* title : 豆瓣电影Top250
*/
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 {
/**
* rating : {"max":10,"average":9.6,"starsmin":0}
* genres : ["犯罪","剧情"]":"50","
* title : 肖申克的救赎
* 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·罗宾斯","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":"鲍勃·冈顿","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":"弗兰克·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
*/
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 {
/**
* max : 10
* average : 9.6
* stars : 50
* min : 0
*/
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 {
/**
* 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 */
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 {
/**
* 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·罗宾斯
* id : 1054521
*/
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 {
/**
* 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 */
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 {
/**
* 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 : 弗兰克·德拉邦特
* id : 1047973
*/
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 {
/**
* 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 */
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;
}
}
}
}
}12
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[/code]
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;
/**
* Created by Administrator on 2017/3/9.
*/
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;
}
}12
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[/code]
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);
/* movieService.getTopMovie(start, count)
.map(new HttpResultFunc<List<Subject>>())
.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();
}
}
}12
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[/code]
package ledon.com.retrofitdemo.api;1
import ledon.com.retrofitdemo.MovieBean;
import retrofit2.Call;
import retrofit2.http.GET;
import retrofit2.http.Query;
import rx.Observable;
/**
* Created by Administrator on 2017/3/9.
*/
public interface MovieService { @GET("top250") Observable<MovieBean> getTopMovie(@Query("start")int start, @Query("count")int count); }
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[/code]
<?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: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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