Rx-Volley 自己来封装

电玩女神 2022-08-20 05:20 150阅读 0赞

自从15年接触了RxJava，对函数式编程越发的喜爱。以前Android项目上网络层都是统一的使用Volley，已经对网络请求的回调，多个回调嵌入各种不爽了，趁着年前任务轻松，赶紧的将Volley封装一下，投向RxJava的怀抱！！

Volley除了提供异步处理回调接口外，还支持同步调用网络，主要是使用RequestFuture进行同步调用。所以Volley封装成Rx-Volley只需要以此为入口即可。

为了方便维护和升级，已将代码提交到git：[https://github.com/cmlbeliever/RX-Volley][https_github.com_cmlbeliever_RX-Volley]

核心代码如下：

package com.cml.lib.rxvolley.rxvolley;
    
    import com.android.volley.DefaultRetryPolicy;
    import com.android.volley.Request;
    import com.android.volley.RequestQueue;
    import com.android.volley.RetryPolicy;
    import com.android.volley.toolbox.RequestFuture;
    import com.cml.lib.rxvolley.framework.RequestManager;
    
    import rx.Observable;
    import rx.Subscriber;
    import rx.schedulers.Schedulers;
    
    /**
     * Created by cmlBeliever on 2016/2/1.
     * <p>
     * 将Volley请求封装成RxJava结构返回，注意：所有的请求都在IO线程中处理
     */
    public class RxRequest {
    
        /**
         * 发送post请求
         *
         * @param url
         * @param target
         * @param <T>
         * @return
         */
        public static <T> Observable<T> post(String url, Class<?> target) {
            return request(url, target, Request.Method.POST, new DefaultRetryPolicy());
        }
    
        /**
         * 发送post请求
         *
         * @param url
         * @param target
         * @param <T>
         * @return
         */
        public static <T> Observable<T> post(String url, Class<?> target, RetryPolicy retryPolicy) {
            return request(url, target, Request.Method.POST, retryPolicy);
        }
    
        /**
         * 发送Get请求
         *
         * @param url
         * @param target
         * @param <T>
         * @return
         */
        public static <T> Observable<T> get(String url, Class<?> target) {
            return request(url, target, Request.Method.GET, new DefaultRetryPolicy());
        }
    
        /**
         * 发送Get请求
         *
         * @param url
         * @param target
         * @param <T>
         * @return
         */
        public static <T> Observable<T> get(String url, Class<?> target, RetryPolicy retryPolicy) {
            return request(url, target, Request.Method.GET, retryPolicy);
        }
    
        public static <T> Observable<T> request(String url, Class<?> target, int method, RetryPolicy retryPolicy) {
    
            final RequestFuture<T> requestFuture = RequestFuture.newFuture();
    
            final GsonRequest<T> request = new GsonRequest<T>(target, method, url, null, requestFuture, requestFuture);
            request.setRetryPolicy(retryPolicy);
            request.setTag(url);
    
            requestFuture.setRequest(request);
    
            return Observable.create(new Observable.OnSubscribe<T>() {
    
                @Override
                public void call(Subscriber<? super T> subscriber) {
                    try {
                        //只在被订阅后才进行网络请求处理
                        RequestManager.getRequestQueue().add(request);
                        if (!subscriber.isUnsubscribed() && !requestFuture.isCancelled()) {
                            subscriber.onNext(requestFuture.get());
                            subscriber.onCompleted();
                        }
                    } catch (Exception e) {
                        subscriber.onError(e);
                    }
                }
    
            }).subscribeOn(Schedulers.io());
        }
    
        /**
         * 取消请求
         *
         * @param url
         */
        public static void cancel(final String url) {
            RequestManager.getRequestQueue().cancelAll(new RequestQueue.RequestFilter() {
                @Override
                public boolean apply(Request<?> request) {
                    return request.getTag().equals(url);
                }
            });
        }
    }

使用方式：

String url = "https://raw.githubusercontent.com/cml8655/note/master/data/test.json";
                    RxRequest.<MyModel>post(url, MyModel.class).subscribe(new Subscriber<MyModel>() {
                        @Override
                        public void onCompleted() {
                            Log.i("RxRequest", "onCompleted");
                        }
    
                        @Override
                        public void onError(Throwable e) {
                            Log.e("RxRequest", "onError", e);
                        }
    
                        @Override
                        public void onNext(MyModel myModel) {
                            Log.i("RxRequest", "onNext==>" + myModel);
                        }
                    });

[https_github.com_cmlbeliever_RX-Volley]: https://github.com/cmlbeliever/RX-Volley