整體知識(shí)

Carson帶你學(xué)Android：網(wǎng)絡(luò)請(qǐng)求庫(kù)Retrofit使用教程(含實(shí)例講解) - 簡(jiǎn)書

Retrofit一些基礎(chǔ)知識(shí)_xuyin1204的博客-CSDN博客

簡(jiǎn)單步驟和demo

Retrofit2 實(shí)戰(zhàn)（一、使用詳解篇） - 掘金

進(jìn)階使用：

1、類型轉(zhuǎn)換、rxjava、okhttp；

2、使用retrofit做為網(wǎng)絡(luò)請(qǐng)求時(shí)，解決多個(gè)BaseURL切換的問(wèn)題：添加okhttpclient攔截器，捕獲添加的Headers，然后修改baseURL

Retrofit2詳解_retrofit2 params-CSDN博客

超時(shí)-重試-緩存-攔截器

Android-Retrofit-超時(shí)-重試-緩存-攔截器 - 簡(jiǎn)書

重試兩種方式：

如果不是全局用同一個(gè)重試機(jī)制，由于會(huì)每次都需要?jiǎng)?chuàng)建一個(gè)OkHttpInterceptor，會(huì)造成資源浪費(fèi)，不建議使用。

Retrofit實(shí)現(xiàn)重試機(jī)制（自定義Interceptor或封裝callback）_retrofit 重試-CSDN博客

做個(gè)完善

public class OkHttpRetryInterceptor implements Interceptor {

    private List<Long> retryIntervalList = new ArrayList<>();

    public OkHttpRetryInterceptor(List<Long> retryIntervalList) {
        if (retryIntervalList != null && !retryIntervalList.isEmpty()) {
            this.retryIntervalList = retryIntervalList;
            return;
        }
        //默認(rèn)1.5秒重試一次
        retryIntervalList.add(1500L);
    }

    /**
     * 該方法提供了一個(gè)Chain類型的對(duì)象，Chain對(duì)象中可以獲取到Request對(duì)象
     * ，而調(diào)用Chain對(duì)象的proceed方法（該方法接收一個(gè)Request對(duì)象）就可發(fā)起一次網(wǎng)絡(luò)請(qǐng)求
     * ，該方法返回Response對(duì)象。
     *
     * @param chain
     * @return
     * @throws IOException
     */
    @Override
    public Response intercept(Chain chain) throws IOException {
        Request request = chain.request();
        Response response = doRequest(chain, request);
        if (response != null && response.isSuccessful()) {
            return response;
        }

        for (int i = 0; i < retryIntervalList.size(); i++) {
            Long retryInterval = retryIntervalList.get(i);
            if (retryInterval == null) {
                continue;
            }
            if (i == 0 || ((response == null) || !response.isSuccessful())) {
                try {
                    Thread.sleep(retryInterval);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                response = doRequest(chain, request);
            }
        }

        return response;
    }

    private Response doRequest(Chain chain, Request request) {
        try {
            return chain.proceed(request);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    public static class Builder {

        private List<Long> retryIntervalList = new ArrayList<>();

        public Builder buildRetryInterval(List<Long> retryIntervalList) {
            this.retryIntervalList = retryIntervalList;
            return this;
        }

        public OkHttpRetryInterceptor build() {
            return new OkHttpRetryInterceptor(retryIntervalList);
        }
    }

}

解決多個(gè)BaseURL切換其他方案

解決Retrofit多BaseUrl及運(yùn)行時(shí)動(dòng)態(tài)改變BaseUrl? - 簡(jiǎn)書