retrofit 簡單使用

1. build.gradle

implementation'com.squareup.retrofit2:retrofit:2.9.0'

implementation'com.google.code.gson:gson:2.8.6'

implementation'com.squareup.retrofit2:converter-gson:2.9.0'

如果想使用最新版本，可以把版本號改為+，然后去 External Libraries，看看下載下來的lib的版本號，再把+改為 看到的版本號即可。。 為什么，再改回來，使用+，可能每次都去網絡下載lib，導致編譯很慢。

版本號固定，比如gson, 2.8.6，本地已經有了，直接使用本地，不會再網絡請求。但是+號會，再次請求對比。不需要實時保持最新。

2.?public interface GitHubService {

@GET("check_update.php")

Call>reqNewVersionApk();

}





3.

{

OkHttpClient.Builder builder =new OkHttpClient.Builder();

? ? if (Consts.isDebug) {

HttpLoggingInterceptor loggingInterceptor =new HttpLoggingInterceptor("Retrofit2");

? ? ? ? //log打印級別，決定了log顯示的詳細程度

? ? ? ? loggingInterceptor.setPrintLevel(HttpLoggingInterceptor.Level.BODY);

? ? ? ? //log顏色級別，決定了log在控制臺顯示的顏色

? ? ? ? loggingInterceptor.setColorLevel(Level.INFO);

? ? ? ? builder.addInterceptor(loggingInterceptor);

? ? }

OkHttpClient client = builder.build();

? ? Retrofit retrofit =new Retrofit.Builder()

.client(client)

.baseUrl("http://www.xxx.xyz/xxx/app/")//要訪問的主機地址，注意以 /（斜線） 結束，不然可能會拋出異常

? ? ? ? ? ? .addConverterFactory(GsonConverterFactory.create())//添加Gson

? ? ? ? ? ? .build();

? ? GitHubService service = retrofit.create(GitHubService.class);

? ? // xxx/app/

? ? Call> call = service.reqNewVersionApk();

? ? call.enqueue(new Callback>() {

@Override

? ? ? ? public void onResponse(Call> call, retrofit2.Response> response) {

RespBase appUpdateResp = response.body();

? ? ? ? ? ? MyLog.print("appUpdateResp.getCode:" + appUpdateResp.getCode());

? ? ? ? ? ? MyLog.print("appUpdateResp.getdata.apkurl:" + appUpdateResp.getData().getApkUrl());

? ? ? ? }

@Override

? ? ? ? public void onFailure(Call> call, Throwable t) {

MyLog.printError(t);

? ? ? ? }

});

}


4.HttpLoggingInterceptor

/*

* Copyright 2016 jeasonlzy(廖子堯)

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

*? ? ? http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/

package com.lzy.okgo.interceptor;

import com.lzy.okgo.utils.IOUtils;

import com.lzy.okgo.utils.OkLogger;

import java.io.IOException;

import java.nio.charset.Charset;

import java.util.concurrent.TimeUnit;

import java.util.logging.Logger;

import okhttp3.Connection;

import okhttp3.Headers;

import okhttp3.Interceptor;

import okhttp3.MediaType;

import okhttp3.Protocol;

import okhttp3.Request;

import okhttp3.RequestBody;

import okhttp3.Response;

import okhttp3.ResponseBody;

import okhttp3.internal.http.HttpHeaders;

import okio.Buffer;

/**

* ================================================

* 作? ? 者：jeasonlzy（廖子堯）Github地址：https://github.com/jeasonlzy

* 版? ? 本：1.0

* 創建日期：2016/1/12

* 描? ? 述：OkHttp攔截器，主要用于打印日志

* 修訂歷史：

* ================================================

*/

public class HttpLoggingInterceptorimplements Interceptor {

private static final CharsetUTF8 = Charset.forName("UTF-8");

? ? private volatile LevelprintLevel = Level.NONE;

? ? private java.util.logging.LevelcolorLevel;

? ? private Loggerlogger;

? ? public enum Level {

NONE,? ? ? //不打印log

? ? ? ? BASIC,? ? ? //只打印 請求首行 和 響應首行

? ? ? ? HEADERS,? ? //打印請求和響應的所有 Header

? ? ? ? BODY? ? ? ? //所有數據全部打印

? ? }

public HttpLoggingInterceptor(String tag) {

logger = Logger.getLogger(tag);

? ? }

public void setPrintLevel(Level level) {

if (printLevel ==null)throw new NullPointerException("printLevel == null. Use Level.NONE instead.");

? ? ? ? printLevel = level;

? ? }

public void setColorLevel(java.util.logging.Level level) {

colorLevel = level;

? ? }

private void log(String message) {

logger.log(colorLevel, message);

? ? }

@Override

? ? public Responseintercept(Chain chain)throws IOException {

Request request = chain.request();

? ? ? ? if (printLevel == Level.NONE) {

return chain.proceed(request);

? ? ? ? }

//請求日志攔截

? ? ? ? logForRequest(request, chain.connection());

? ? ? ? //執行請求，計算請求時間

? ? ? ? long startNs = System.nanoTime();

? ? ? ? Response response;

? ? ? ? try {

response = chain.proceed(request);

? ? ? ? }catch (Exception e) {

log("<-- HTTP FAILED: " + e);

? ? ? ? ? ? throw e;

? ? ? ? }

long tookMs = TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - startNs);

? ? ? ? //響應日志攔截

? ? ? ? return logForResponse(response, tookMs);

? ? }

private void logForRequest(Request request, Connection connection)throws IOException {

boolean logBody = (printLevel == Level.BODY);

? ? ? ? boolean logHeaders = (printLevel == Level.BODY ||printLevel == Level.HEADERS);

? ? ? ? RequestBody requestBody = request.body();

? ? ? ? boolean hasRequestBody = requestBody !=null;

? ? ? ? Protocol protocol = connection !=null ? connection.protocol() : Protocol.HTTP_1_1;

? ? ? ? try {

String requestStartMessage ="--> " + request.method() +' ' + request.url() +' ' + protocol;

? ? ? ? ? ? log(requestStartMessage);

? ? ? ? ? ? if (logHeaders) {

if (hasRequestBody) {

// Request body headers are only present when installed as a network interceptor. Force

// them to be included (when available) so there values are known.

? ? ? ? ? ? ? ? ? ? if (requestBody.contentType() !=null) {

log("\tContent-Type: " + requestBody.contentType());

? ? ? ? ? ? ? ? ? ? }

if (requestBody.contentLength() != -1) {

log("\tContent-Length: " + requestBody.contentLength());

? ? ? ? ? ? ? ? ? ? }

}

Headers headers = request.headers();

? ? ? ? ? ? ? ? for (int i =0, count = headers.size(); i < count; i++) {

String name = headers.name(i);

? ? ? ? ? ? ? ? ? ? // Skip headers from the request body as they are explicitly logged above.

? ? ? ? ? ? ? ? ? ? if (!"Content-Type".equalsIgnoreCase(name) && !"Content-Length".equalsIgnoreCase(name)) {

log("\t" + name +": " + headers.value(i));

? ? ? ? ? ? ? ? ? ? }

}

log(" ");

? ? ? ? ? ? ? ? if (logBody && hasRequestBody) {

if (isPlaintext(requestBody.contentType())) {

bodyToString(request);

? ? ? ? ? ? ? ? ? ? }else {

log("\tbody: maybe [binary body], omitted!");

? ? ? ? ? ? ? ? ? ? }

}

}

}catch (Exception e) {

OkLogger.printStackTrace(e);

? ? ? ? }finally {

log("--> END " + request.method());

? ? ? ? }

}

private ResponselogForResponse(Response response, long tookMs) {

Response.Builder builder = response.newBuilder();

? ? ? ? Response clone = builder.build();

? ? ? ? ResponseBody responseBody = clone.body();

? ? ? ? boolean logBody = (printLevel == Level.BODY);

? ? ? ? boolean logHeaders = (printLevel == Level.BODY ||printLevel == Level.HEADERS);

? ? ? ? try {

log("<-- " + clone.code() +' ' + clone.message() +' ' + clone.request().url() +" (" + tookMs +"ms）");

? ? ? ? ? ? if (logHeaders) {

Headers headers = clone.headers();

? ? ? ? ? ? ? ? for (int i =0, count = headers.size(); i < count; i++) {

log("\t" + headers.name(i) +": " + headers.value(i));

? ? ? ? ? ? ? ? }

log(" ");

? ? ? ? ? ? ? ? if (logBody && HttpHeaders.hasBody(clone)) {

if (responseBody ==null)return response;

? ? ? ? ? ? ? ? ? ? if (isPlaintext(responseBody.contentType())) {

byte[] bytes = IOUtils.toByteArray(responseBody.byteStream());

? ? ? ? ? ? ? ? ? ? ? ? MediaType contentType = responseBody.contentType();

? ? ? ? ? ? ? ? ? ? ? ? String body =new String(bytes, getCharset(contentType));

? ? ? ? ? ? ? ? ? ? ? ? log("\tbody:" + body);

? ? ? ? ? ? ? ? ? ? ? ? responseBody = ResponseBody.create(responseBody.contentType(), bytes);

? ? ? ? ? ? ? ? ? ? ? ? return response.newBuilder().body(responseBody).build();

? ? ? ? ? ? ? ? ? ? }else {

log("\tbody: maybe [binary body], omitted!");

? ? ? ? ? ? ? ? ? ? }

}

}

}catch (Exception e) {

OkLogger.printStackTrace(e);

? ? ? ? }finally {

log("<-- END HTTP");

? ? ? ? }

return response;

? ? }

private static CharsetgetCharset(MediaType contentType) {

Charset charset = contentType !=null ? contentType.charset(UTF8) :UTF8;

? ? ? ? if (charset ==null) charset =UTF8;

? ? ? ? return charset;

? ? }

/**

* Returns true if the body in question probably contains human readable text. Uses a small sample

* of code points to detect unicode control characters commonly used in binary file signatures.

*/

? ? private static boolean isPlaintext(MediaType mediaType) {

if (mediaType ==null)return false;

? ? ? ? if (mediaType.type() !=null && mediaType.type().equals("text")) {

return true;

? ? ? ? }

String subtype = mediaType.subtype();

? ? ? ? if (subtype !=null) {

subtype = subtype.toLowerCase();

? ? ? ? ? ? if (subtype.contains("x-www-form-urlencoded") || subtype.contains("json") || subtype.contains("xml") || subtype.contains("html"))//

? ? ? ? ? ? ? ? return true;

? ? ? ? }

return false;

? ? }

private void bodyToString(Request request) {

try {

Request copy = request.newBuilder().build();

? ? ? ? ? ? RequestBody body = copy.body();

? ? ? ? ? ? if (body ==null)return;

? ? ? ? ? ? Buffer buffer =new Buffer();

? ? ? ? ? ? body.writeTo(buffer);

? ? ? ? ? ? Charset charset =getCharset(body.contentType());

? ? ? ? ? ? log("\tbody:" + buffer.readString(charset));

? ? ? ? }catch (Exception e) {

OkLogger.printStackTrace(e);

? ? ? ? }

}

}

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