Okhttp、Retrofit進(jìn)度獲取的方法(一行代碼搞定)

更新時(shí)間：2018年04月03日 11:42:47 作者：Allen___

本篇文章主要介紹了Okhttp、Retrofit進(jìn)度獲取的方法(一行代碼搞定)，小編覺(jué)得挺不錯(cuò)的，現(xiàn)在分享給大家，也給大家做個(gè)參考。一起跟隨小編過(guò)來(lái)看看吧

起因

對(duì)于廣大Android開(kāi)發(fā)者來(lái)說(shuō)，最近用的最多的網(wǎng)絡(luò)庫(kù)，莫過(guò)于Okhttp啦（Retrofit依賴Okhttp）。

Okhttp不像SDK內(nèi)置的HttpUrlConnection一樣，可以明確的獲取數(shù)據(jù)讀寫的過(guò)程，我們需要執(zhí)行一些操作。

介紹

Retrofit依賴Okhttp、Okhttp依賴于Okio。那么Okio又是什么鬼？別急，看官方介紹：
Okio is a library that complements java.io and java.nio to make it much easier to access, store, and process your data.

翻譯過(guò)來(lái)就是，Okio是一個(gè)實(shí)現(xiàn)了java.io和java.nio的一個(gè)類庫(kù)，它讓連接，存儲(chǔ)，處理你的數(shù)據(jù)更加輕松~（Okio既是讀寫相關(guān)類庫(kù)，獲取進(jìn)度要從Okio入手）。

好吧，對(duì)于廣大開(kāi)發(fā)者來(lái)說(shuō)，內(nèi)心是這樣的：TM又要看你文檔和用例，按你規(guī)則走，輕松個(gè)毛啊！

其實(shí)，讀下API，看下Example熟悉后，人家設(shè)計(jì)的還是很棒噠。

廢話不多說(shuō)，先看效果。

效果

實(shí)際代碼：

 //添加下載攔截器(this參數(shù)是實(shí)現(xiàn)下載進(jìn)度接口的對(duì)象) 
 mDownClient = new OkHttpClient.Builder()
       //只需要一行代碼就行了
      .addNetworkInterceptor(new DownloadInterceptor(this))
      .build();
      
 //添加上傳攔截器(this參數(shù)是實(shí)現(xiàn)上傳回調(diào)接口的對(duì)象)      
 mUploadClient = new OkHttpClient.Builder()
       //只需要一行代碼就行了
      .addNetworkInterceptor(new UploadInterceptor(this))
      .build();

你只需要一行代碼是不行的！我為什么行？因?yàn)檫@是我寫的封裝類庫(kù)啊~（最后放地址）

思路

Okhttp依賴Okio進(jìn)行了數(shù)據(jù)的讀寫動(dòng)作，我們需要找到Okio進(jìn)行處理。那么，如何加上呢？

Okhttp可以添加Interceptor（攔截器），我們可以通過(guò)攔截器的接口方法，獲取對(duì)應(yīng)的responseBody、requestBody對(duì)象進(jìn)行操作。然后我們就獲取了讀寫相關(guān)的實(shí)現(xiàn)方法。具體實(shí)現(xiàn)是通過(guò)Source、Sink對(duì)象。

Source官方解釋：Supplies a stream of bytes. Use this interface to read data from wherever it's located。

Sink官方解釋：Receives a stream of bytes. Use this interface to write data wherever it's needed。

一句話概括：Source對(duì)象是對(duì)輸入流的包裝（下載讀數(shù)據(jù)），Sink是對(duì)輸出流的包裝（寫數(shù)據(jù)上傳）。

實(shí)現(xiàn)

根據(jù)需要添加下載、上傳Interceptor

   //添加下載攔截器(this參數(shù)是實(shí)現(xiàn)下載進(jìn)度接口的對(duì)象) 
  mDownClient = new OkHttpClient.Builder()
      .addNetworkInterceptor(new DownloadInterceptor(this))
      .build();
      
 //添加上傳攔截器(this參數(shù)是實(shí)現(xiàn)上傳回調(diào)接口的對(duì)象)      
 mUploadClient = new OkHttpClient.Builder()
      .addNetworkInterceptor(new UploadInterceptor(this))
      .build();

攔截器具體實(shí)現(xiàn)

 //下載攔截器   
public class DownloadInterceptor implements Interceptor {
private OnDownloadListener mListener;

public DownloadInterceptor( OnDownloadListener listener) {
  mListener = listener;
}

@Override
public Response intercept(Chain chain) throws IOException {
  //封裝ressponse對(duì)象
  Response response = wrapResponse(chain.proceed(chain.request()));
  return response;
}

private Response wrapResponse(Response response) {
  if (response == null || response.body() == null) {
    return response;
  }
  //獲取處理后的response對(duì)象
  Response wrapResponse = getWrapResponse(response);
  return wrapResponse;
}

private Response getWrapResponse(Response response) {
  ProgressInfo info = new ProgressInfo();
  info.setTime(System.currentTimeMillis()+"");
  info.setUrl(response.request().url().toString());
  Response.Builder builder = response.newBuilder();
  //封裝responseBody，傳入相關(guān)參數(shù)，獲取進(jìn)度數(shù)據(jù)回調(diào)
  return builder.body(new WrapResponseBody(response.body(),info,mListener)).build();
}
}
  --------------------------------------分割---------------------------------------
 //上傳攔截器
 public class UploadInterceptor implements Interceptor {
private OnUploadListener mListener;

public UploadInterceptor(OnUploadListener listener) {
  mListener = listener;
}

@Override
public Response intercept(Chain chain) throws IOException {
  //封裝request對(duì)象
  Request request = wrapRequest(chain.request());
  Response response = chain.proceed(request);
  return response;
}


private Request wrapRequest(Request request) {
  if (request == null || request.body() == null) {
    return request;
  }
  Request.Builder builder = request.newBuilder();
  ProgressInfo info = new ProgressInfo();
  HttpUrl url = request.url();
  info.setUrl(url.toString());
  info.setTime(System.currentTimeMillis()+"");
  //封裝requestBody，傳入?yún)?shù)，獲取數(shù)據(jù)進(jìn)度回調(diào)
  builder.method(request.method(),new WrapRequestBody(request.body(),info,mListener));
  return builder.build();
  }
 }
responseBody、requestBody相關(guān)實(shí)現(xiàn)

//繼承ResponseBody實(shí)現(xiàn)具體方法
public class WrapResponseBody extends ResponseBody {
private Handler mHandler = new Handler(Looper.getMainLooper());
private ResponseBody mResponseBody;
private OnDownloadListener mListener;
private ProgressInfo mInfo;
private BufferedSource mBufferedSource;
private boolean mDoProgress;
//傳入進(jìn)度，以及監(jiān)聽(tīng)對(duì)象
public WrapResponseBody(ResponseBody responseBody, ProgressInfo info, OnDownloadListener listener) {
  mResponseBody = responseBody;
  mInfo = info;
  mListener = listener;
}

@Nullable
@Override
public MediaType contentType() {
  //接口方法，返回類型
  return mResponseBody.contentType();
}

@Override
public long contentLength() {
  
  long contentLength = mResponseBody.contentLength();
  //gzip壓縮格式會(huì)返回-1，目前處理是在請(qǐng)求頭信息指定("Accept-Encoding","identity")表示不壓縮
  if (contentLength == -1) {
    mDoProgress = false;
    mHandler.post(new Runnable() {
      @Override
      public void run() {
        //切換線程，進(jìn)行失敗回調(diào)
        mListener.onDownLoadGetContentLengthFail(mInfo);
      }
    });
  } else {
    mDoProgress = true;
  }
  return contentLength;
}

@Override
public BufferedSource source() {
  //WrapSource（繼承ForwardingSource，F(xiàn)orwardingSource實(shí)現(xiàn)了Source接口）
  if (mBufferedSource == null) {
    mInfo.setContentLength(contentLength());
     //傳入?yún)?shù)，讀取具體進(jìn)度信息，并回調(diào) 
    WrapSource wrapSource = new WrapSource(mResponseBody.source(), mInfo, mListener,mDoProgress);
    mBufferedSource = Okio.buffer(wrapSource);
  }
  return mBufferedSource;
}
}

--------------------------------------分割---------------------------------------  

//繼承ResquestBody實(shí)現(xiàn)具體方法
public class WrapRequestBody extends RequestBody {
private RequestBody mRequestBody;
private OnUploadListener mListener;
private ProgressInfo mInfo;
private boolean mDoProgress;
private Handler mHandler = new Handler(Looper.getMainLooper());
 //傳入進(jìn)度，以及監(jiān)聽(tīng)對(duì)象
public WrapRequestBody(RequestBody requestBody, ProgressInfo info, OnUploadListener listener) {
  mRequestBody = requestBody;
  mListener = listener;
  mInfo = info;
}


@Override
public MediaType contentType() {
  //接口方法，返回類型
  return mRequestBody.contentType();
}

@Override
public long contentLength() throws IOException {
  try {
    //上傳內(nèi)容長(zhǎng)度，有異常走failWrok處理
    long l = mRequestBody.contentLength();
    mDoProgress = true;
    return l;
  } catch (IOException e) {
    e.printStackTrace();
    failWork();
    return -1;
  }
}
//進(jìn)行失敗處理
private void failWork() {
  mDoProgress = false;
  mHandler.post(new Runnable() {
    @Override
    public void run() {
      //切換線程，回調(diào)失敗信息
      mListener.onUploadGetContentLengthFail(mInfo);
    }
  });
}

@Override
public void writeTo(BufferedSink sink) throws IOException {
  mInfo.setContentLength(contentLength());
  // WrapSink （繼承ForwardingSink，F(xiàn)orwardingSink實(shí)現(xiàn)了Sink接口）
  ///傳入?yún)?shù)，讀取具體進(jìn)度信息，并回調(diào) 
  WrapSink wrapSink = new WrapSink(sink, mInfo, mListener, mDoProgress);
  BufferedSink buffer = Okio.buffer(wrapSink);
  mRequestBody.writeTo(buffer);
  buffer.flush();
}
}
WrapSource、WrapSink相關(guān)實(shí)現(xiàn)

//繼承ForwardingSource 實(shí)現(xiàn)具體方法
public class WrapSource extends ForwardingSource {
private Handler mHandler = new Handler(Looper.getMainLooper());
private Source mSource;
private ProgressInfo mInfo;
private OnDownloadListener mListener;
private boolean mDoProgress;

public WrapSource(Source source, ProgressInfo info, OnDownloadListener listener, boolean doProgress) {
  //傳入源Source、進(jìn)度信息、監(jiān)聽(tīng)進(jìn)度等信息。
  super(source);
  mSource = source;
  mInfo = info;
  mListener = listener;
  //傳入是否繼續(xù)執(zhí)行回調(diào)boolean參數(shù)，如果之前執(zhí)行有異常，則不再繼續(xù)執(zhí)行回調(diào)
  mDoProgress = doProgress;
}

@Override
public long read(Buffer sink, long byteCount) throws IOException {
  //獲取具體進(jìn)度信息，來(lái)到了熟悉的具體IO
  long read = super.read(sink, byteCount);
  if (read != -1) {
    long l = mInfo.getCurrentLength() + read;
    mInfo.setCurrentLength(l);
    mHandler.post(new Runnable() {
      @Override
      public void run() {
        if (mDoProgress) {
          //切換到主線程，回調(diào)數(shù)據(jù)
          mListener.onDownLoadProgress(mInfo);
        }
      }
    });
  }
  return read;
}
}

--------------------------------------分割---------------------------------------

//繼承ForwardingSink 實(shí)現(xiàn)具體方法
public class WrapSink extends ForwardingSink {
private Handler mHandler = new Handler(Looper.getMainLooper());
public OnUploadListener mListener;
public ProgressInfo mInfo;
public boolean mDoProgress;

public WrapSink(Sink delegate, ProgressInfo info, OnUploadListener listener, boolean doProgress) {
  //傳入源Source、進(jìn)度信息、監(jiān)聽(tīng)進(jìn)度等信息。
  super(delegate);
  mInfo = info;
  mListener = listener;
   //傳入是否繼續(xù)執(zhí)行回調(diào)boolean參數(shù)，如果之前執(zhí)行有異常，則不再繼續(xù)執(zhí)行回調(diào)
  mDoProgress = doProgress;
}

@Override
public void write(Buffer source, long byteCount) throws IOException {
  super.write(source, byteCount);
  //獲取具體進(jìn)度信息，來(lái)到了熟悉的具體IO
  long l = mInfo.getCurrentLength() + byteCount;
  mInfo.setCurrentLength(l);
  mHandler.post(new Runnable() {
    @Override
    public void run() {
      if (mDoProgress) {
        //切換到主線程，回調(diào)數(shù)據(jù)
        mListener.onUpLoadProgress(mInfo);
      }
    }
  });
}
}

總結(jié)

以上就是具體的流程了，按照步驟其實(shí)很簡(jiǎn)單。大家了解下挺好的，我這邊也封裝好了具體的類庫(kù)和Demo，大家可以直接依賴（查看README.md，使用簡(jiǎn)單）。

地址：https://github.com/HoldMyOwn/TNetProgress

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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