Retrofit2+Rxjava练手项目_1

1.添加依赖：

compile 'io.reactivex:rxjava:1.2.7'
    compile 'io.reactivex:rxandroid:1.2.1'
    compile 'com.squareup.retrofit2:retrofit:2.2.0'
    compile 'com.squareup.retrofit2:converter-gson:2.2.0'
    compile 'com.squareup.retrofit2:adapter-rxjava:2.2.0'
    compile 'com.google.code.gson:gson:2.8.0'
    compile 'com.jakewharton:butterknife:8.5.1'
    annotationProcessor 'com.jakewharton:butterknife-compiler:8.5.1'

这里需要注意ButterKnife8.5.1的配置方法。
参考：http://blog.youkuaiyun.com/niubitianping/article/details/54893571

2.添加网络权限。
3.添加一个实体类：MovieEntity.java。
API：https://api.douban.com/v2/movie/top250?start=0&count=10
依旧是采用GsonFormt插件自动添加，为了显示可以手动重写toString函数。
4.Service.java:

public interface Service {
    @GET("top250")
    Observable<MovieEntity> getMovie(@Query("start") int start,
                                     @Query("count") int count);
}

5.网络请求类HttpMethods.java:

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 Service service;
    private HttpMethods(){
        OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
        httpClient.connectTimeout(DEFAULT_TIMEOUT, TimeUnit.SECONDS);

        retrofit = new Retrofit.Builder()
                .baseUrl(BASE_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .client(httpClient.build())
                .build();
        service = retrofit.create(Service.class);
    }


    private static class SingletonHolder{
        private static final HttpMethods INSTANCE = new HttpMethods();
    }

    public static HttpMethods getInstance(){
        return SingletonHolder.INSTANCE;
    }

    public void getTopMovie(Subscriber<MovieEntity> subscriber, int start, int count){
        service.getMovie(start, count)
                .subscribeOn(Schedulers.io())
                .unsubscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(subscriber);
    }
}

6.activity_main.xml

<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="点我"
        android:textSize="16sp"/>
    <TextView
        android:id="@+id/result_TV"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@id/click_me_BN"
        android:text="Hello World!"
        android:textSize="16sp"/>

7.MainActivity.java

public class MainActivity extends AppCompatActivity {

    public static final String API_URL="https://api.douban.com/v2/movie/";

    @BindView(R.id.click_me_BN)
    Button clickMeBN;

    @BindView(R.id.result_TV)
    TextView resultTV;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
    }


    @OnClick(R.id.click_me_BN)
    public void onClick() {
        getMovie();
    }
    //进行网络请求
    private void getMovie(){
        Subscriber subscriber = new Subscriber<MovieEntity>() {
            @Override
            public void onCompleted() {
                Toast.makeText(MainActivity.this, "Get Top Movie Completed", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onError(Throwable e) {
                e.printStackTrace();
            }

            @Override
            public void onNext(MovieEntity o) {
                resultTV.setText(o.toString());
            }
        };
        HttpMethods.getInstance().getTopMovie(subscriber, 0, 5);

    }
}

参考文章：http://gank.io/post/56e80c2c677659311bed9841