《Android进阶之光》--RxJava结合Retrofit访问网络

1）配置

dependencies{
    ...
    compile 'io.reactivex:rxjava:1.2.0'
    compile 'io.reactivex:rxandroid:1.2.1'
    compile 'com.squareup.retrofit2:retorfit:2.1.0'
    compile 'com.squareup.retrofit2:converter-gson:2.1.0'
    compile 'com.squareup.retrofit2:adapter-rxjava:2.1.0'
}

2）修改请求网络接口

Retrofit请求接口返回Call。若结合RxJava，则需要把Call改为Observable

public interface IpServiceForPost{
    @FormUrlEncoded
    @POST("getIpInfo.php")
    Observable<IpModel> getIpMsg(@Field("ip") String first);
}

3）修改请求网络方法

private void postIpInformation(String ip){
    String url = "http://ip.taobao.com/service/";
    Retrofit retrofit = new Retrofit.Builder().baseUrl(url).addConverterFactory(GsonConverterFactory.create())
    .addCallAdapterFactory(RxJavaCallAdapterFactory.create()).build();
    IpServiceForPost ipService = retrofit.create(IpServcieForPost.class);
    subscription=ipService.getIpMsg(ip).subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread())
    .subscribe(new Subscriber<IpModel>(){
        @Override
        public void onCompleted(){
            Log.d(TAG,"onCompleted");
        }
        @Override
        public void onError(Throwable e){
            Log.d(TAG,"onError");
        }
        @Override
        public void onNext(IpModel ipModel){
            String country=ipModel.getData().getCountry();
            Toast.makeText(getApplicationContext(),country,Toast.LENGTH_SHORT).show();
        }
    });
}

4）请求返回数据格式封装

public class IpModel{
    private int code;
    private IpData data;
    public void setCode(int code){
        this.code = code;
    }
    public int getCode(){
        return this.code;
    }
    ...
}

public class HttpResult<T>{
    private int code;
    private T data;
    public int getCode(){
        return code;
    }
    public void setCode(int code){
        this.code = code;
    }
    public T getData(){
        return data;
    }
    public void setData(T data){
        this.data = data;
    }
}

public interface IpServiceForPost{
    @FormUrlEncoded
    @POST("getIpInfo.php")
    Observable<HttpResult<IpData>> getIpMsg(@Field("ip") String first);
}

private void postIpInformation(String ip){
    ...
    subscription=ipService.getIpMsg(ip).subscribeOn(Schedulers.io())
    .observeOn(AndroidSchedulers.mainThread()).subscribe(new Subscriber<HttpResult<IpData>>(){
        @Override
        public void onCompleted(){
        }
        @Override
        public void onError(Throwable e){
        }
        @Override
        public void onNext(HttpResult<IpData> ipDataHttpResult){
            IpData data=ipDataHttpResult.getData();
            Toast.matkText(getApplicationContext(),data.getCountry(),Toast.LENGTH_SHORT).show();
        }
    });
}

5）取消请求

@Override
public void onStop(){
    super.onStop();
    if(subscription!=null && subscription.isUnsubscribed()){
        subscription.unsubscribe();
    }
}

private CompositeSubscription compositeSubscription = new CompositeSubscription();
...
//发送请求的地方，将返回的subscription添加到compositeSubscription中
compositeSubscription.add(subscription);
...
//取消所有请求
@Override
public void onStop(){
    super.onStop();
    compositeSubscription.unsubscribe();
}