public String toString()

{

return “User{” +

“username='” + username + ‘’’ +

“, password='” + password + ‘’’ +

‘}’;

}

}

服务端返回：

{“username”:“zhy”,“password”:“123”}

客户端可以如下方式调用：

OkHttpClientManager.getAsyn(“http://192.168.56.1:8080/okHttpServer/user!getUser”,

new OkHttpClientManager.ResultCallback()

{

@Override

public void onError(Request request, Exception e)

{

e.printStackTrace();

}

@Override

public void onResponse(User user)

{

mTv.setText(u.toString());//UI线程

}

});

我们传入泛型User，在onResponse里面直接回调User对象。

这里特别要注意的事，如果在json字符串->实体对象过程中发生错误，程序不会崩溃，onError方法会被回调。

注意：这里做了少许的更新，接口命名从StringCallback修改为ResultCallback。接口中的onFailure方法修改为onError。

(二) 回调对象集合

依然是上述的User类，服务端返回

[{“username”:“zhy”,“password”:“123”},{“username”:“lmj”,“password”:“12345”}]

则客户端可以如下调用：

OkHttpClientManager.getAsyn(“http://192.168.56.1:8080/okHttpServer/user!getUsers”,

new OkHttpClientManager.ResultCallback<List>()

{

@Override

public void onError(Request request, Exception e)

{

e.printStackTrace();

}

@Override

public void onResponse(List us)

{

Log.e(“TAG”, us.size() + “”);

mTv.setText(us.get(1).toString());

}

});

唯一的区别，就是泛型变为List<User> ，ok ， 如果发现bug或者有任何意见欢迎留言。

---

源码

ok，基本介绍完了，对于封装的代码其实也很简单，我就直接贴出来了，因为也没什么好介绍的，如果你看完上面的用法，肯定可以看懂：

package com.zhy.utils.http.okhttp;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.Handler;

import android.os.Looper;

import android.widget.ImageView;

import com.google.gson.Gson;

import com.google.gson.internal.$Gson$Types;

import com.squareup.okhttp.Call;

import com.squareup.okhttp.Callback;

import com.squareup.okhttp.FormEncodingBuilder;

import com.squareup.okhttp.Headers;

import com.squareup.okhttp.MediaType;

import com.squareup.okhttp.MultipartBuilder;

import com.squareup.okhttp.OkHttpClient;

import com.squareup.okhttp.Request;

import com.squareup.okhttp.RequestBody;

import com.squareup.okhttp.Response;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.lang.reflect.ParameterizedType;

import java.lang.reflect.Type;

import java.net.CookieManager;

import java.net.CookiePolicy;

import java.net.FileNameMap;

import java.net.URLConnection;

import java.util.HashMap;

import java.util.Map;

import java.util.Set;

/**

• Created by zhy on 15/8/17.

*/

public class OkHttpClientManager

{

private static OkHttpClientManager mInstance;

private OkHttpClient mOkHttpClient;

private Handler mDelivery;

private Gson mGson;

private static final String TAG = “OkHttpClientManager”;

private OkHttpClientManager()

{

mOkHttpClient = new OkHttpClient();

//cookie enabled

mOkHttpClient.setCookieHandler(new CookieManager(null, CookiePolicy.ACCEPT_ORIGINAL_SERVER));

mDelivery = new Handler(Looper.getMainLooper());

mGson = new Gson();

}

public static OkHttpClientManager getInstance()

{

if (mInstance == null)

{

synchronized (OkHttpClientManager.class)

{

if (mInstance == null)

{

mInstance = new OkHttpClientManager();

}

}

}

return mInstance;

}

/**

• 同步的Get请求

• @param url

• @return Response

*/

private Response _getAsyn(String url) throws IOException

{

final Request request = new Request.Builder()

.url(url)

.build();

Call call = mOkHttpClient.newCall(request);

Response execute = call.execute();

return execute;

}

/**

• 同步的Get请求

• @param url

• @return 字符串

*/

private String _getAsString(String url) throws IOException

{

Response execute = _getAsyn(url);

return execute.body().string();

}

/**

• 异步的get请求

• @param url

• @param callback

*/

private void _getAsyn(String url, final ResultCallback callback)

{

final Request request = new Request.Builder()

.url(url)

.build();

deliveryResult(callback, request);

}

/**

• 同步的Post请求

• @param url

• @param params post的参数

• @return

*/

private Response _post(String url, Param… params) throws IOException

{

Request request = buildPostRequest(url, params);

Response response = mOkHttpClient.newCall(request).execute();

return response;

}

/**

• 同步的Post请求

• @param url

• @param params post的参数

• @return 字符串

*/

private String _postAsString(String url, Param… params) throws IOException

{

Response response = _post(url, params);

return response.body().string();

}

/**

• 异步的post请求

• @param url

• @param callback

• @param params

*/

private void _postAsyn(String url, final ResultCallback callback, Param… params)

{

Request request = buildPostRequest(url, params);

deliveryResult(callback, request);

}

/**

• 异步的post请求

• @param url

• @param callback

• @param params

*/

private void _postAsyn(String url, final ResultCallback callback, Map<String, String> params)

{

Param[] paramsArr = map2Params(params);

Request request = buildPostRequest(url, paramsArr);

deliveryResult(callback, request);

}

/**

• 同步基于post的文件上传

• @param params

• @return

*/

private Response _post(String url, File[] files, String[] fileKeys, Param… params) throws IOException

{

Request request = buildMultipartFormRequest(url, files, fileKeys, params);

return mOkHttpClient.newCall(request).execute();

}

private Response _post(String url, File file, String fileKey) throws IOException

{

Request request = buildMultipartFormRequest(url, new File[]{file}, new String[]{fileKey}, null);

return mOkHttpClient.newCall(request).execute();

}

private Response _post(String url, File file, String fileKey, Param… params) throws IOException

{

Request request = buildMultipartFormRequest(url, new File[]{file}, new String[]{fileKey}, params);

return mOkHttpClient.newCall(request).execute();

}

/**

• 异步基于post的文件上传

• @param url

• @param callback

• @param files

• @param fileKeys

• @throws IOException

*/

private void _postAsyn(String url, ResultCallback callback, File[] files, String[] fileKeys, Param… params) throws IOException

{

Request request = buildMultipartFormRequest(url, files, fileKeys, params);

deliveryResult(callback, request);

}

/**

• 异步基于post的文件上传，单文件不带参数上传

• @param url

• @param callback

• @param file

• @param fileKey

• @throws IOException

*/

private void _postAsyn(String url, ResultCallback callback, File file, String fileKey) throws IOException

{

Request request = buildMultipartFormRequest(url, new File[]{file}, new String[]{fileKey}, null);

deliveryResult(callback, request);

}

/**

• 异步基于post的文件上传，单文件且携带其他form参数上传

• @param url

• @param callback

• @param file

• @param fileKey

• @param params

• @throws IOException

*/

private void _postAsyn(String url, ResultCallback callback, File file, String fileKey, Param… params) throws IOException

{

Request request = buildMultipartFormRequest(url, new File[]{file}, new String[]{fileKey}, params);

deliveryResult(callback, request);

}

/**

• 异步下载文件

• @param url

• @param destFileDir 本地文件存储的文件夹

• @param callback

*/

private void _downloadAsyn(final String url, final String destFileDir, final ResultCallback callback)

{

final Request request = new Request.Builder()

.url(url)

.build();

final Call call = mOkHttpClient.newCall(request);

call.enqueue(new Callback()

{

@Override

public void onFailure(final Request request, final IOException e)

{

sendFailedStringCallback(request, e, callback);

}

@Override

public void onResponse(Response response)

{

InputStream is = null;

byte[] buf = new byte[2048];

int len = 0;

FileOutputStream fos = null;

try

{

is = response.body().byteStream();

File file = new File(destFileDir, getFileName(url));

fos = new FileOutputStream(file);

while ((len = is.read(buf)) != -1)

{

fos.write(buf, 0, len);

}

fos.flush();

//如果下载文件成功，第一个参数为文件的绝对路径

sendSuccessResultCallback(file.getAbsolutePath(), callback);

} catch (IOException e)

{

sendFailedStringCallback(response.request(), e, callback);

} finally

{

try

{

if (is != null) is.close();

} catch (IOException e)

{

}

try

{

if (fos != null) fos.close();

} catch (IOException e)

{

}

}

}

});

}

private String getFileName(String path)

{

int separatorIndex = path.lastIndexOf(“/”);

return (separatorIndex < 0) ? path : path.substring(separatorIndex + 1, path.length());

}

/**

• 加载图片

• @param view

• @param url

• @throws IOException

*/

private void _displayImage(final ImageView view, final String url, final int errorResId)

{

final Request request = new Request.Builder()

.url(url)

.build();

Call call = mOkHttpClient.newCall(request);

call.enqueue(new Callback()

{

@Override

public void onFailure(Request request, IOException e)

{

setErrorResId(view, errorResId);

}

@Override

public void onResponse(Response response)

{

InputStream is = null;

try

{

is = response.body().byteStream();

ImageUtils.ImageSize actualImageSize = ImageUtils.getImageSize(is);

ImageUtils.ImageSize imageViewSize = ImageUtils.getImageViewSize(view);

int inSampleSize = ImageUtils.calculateInSampleSize(actualImageSize, imageViewSize);

try

{

is.reset();

} catch (IOException e)

{

response = _getAsyn(url);

is = response.body().byteStream();

}

BitmapFactory.Options ops = new BitmapFactory.Options();

ops.inJustDecodeBounds = false;

ops.inSampleSize = inSampleSize;

final Bitmap bm = BitmapFactory.decodeStream(is, null, ops);

mDelivery.post(new Runnable()

{

@Override

public void run()

{

view.setImageBitmap(bm);

}

});

} catch (Exception e)

{

setErrorResId(view, errorResId);

} finally

{

if (is != null) try

{

is.close();

} catch (IOException e)

{

e.printStackTrace();

}

}

}

});

}

private void setErrorResId(final ImageView view, final int errorResId)

{

mDelivery.post(new Runnable()

{

@Override

public void run()

{

view.setImageResource(errorResId);

}

});

}

//*对外公布的方法

public static Response getAsyn(String url) throws IOException

{

return getInstance()._getAsyn(url);

}

public static String getAsString(String url) throws IOException

{

return getInstance()._getAsString(url);

}

public static void getAsyn(String url, ResultCallback callback)

{

getInstance()._getAsyn(url, callback);

}

public static Response post(String url, Param… params) throws IOException

{

return getInstance()._post(url, params);

}

public static String postAsString(String url, Param… params) throws IOException

{

return getInstance()._postAsString(url, params);

}

public static void postAsyn(String url, final ResultCallback callback, Param… params)

{

getInstance()._postAsyn(url, callback, params);

}

public static void postAsyn(String url, final ResultCallback callback, Map<String, String> params)

{

getInstance()._postAsyn(url, callback, params);

}

public static Response post(String url, File[] files, String[] fileKeys, Param… params) throws IOException

{

return getInstance()._post(url, files, fileKeys, params);

}

public static Response post(String url, File file, String fileKey) throws IOException

{

return getInstance()._post(url, file, fileKey);

}

public static Response post(String url, File file, String fileKey, Param… params) throws IOException

{

return getInstance()._post(url, file, fileKey, params);

}

public static void postAsyn(String url, ResultCallback callback, File[] files, String[] fileKeys, Param… params) throws IOException

{

getInstance()._postAsyn(url, callback, files, fileKeys, params);

}

public static void postAsyn(String url, ResultCallback callback, File file, String fileKey) throws IOException

{

getInstance()._postAsyn(url, callback, file, fileKey);

}

public static void postAsyn(String url, ResultCallback callback, File file, String fileKey, Param… params) throws IOException

{

getInstance()._postAsyn(url, callback, file, fileKey, params);

}

public static void displayImage(final ImageView view, String url, int errorResId) throws IOException

{

getInstance()._displayImage(view, url, errorResId);

}

public static void displayImage(final ImageView view, String url)

{

getInstance()._displayImage(view, url, -1);

}

public static void downloadAsyn(String url, String destDir, ResultCallback callback)

{

getInstance()._downloadAsyn(url, destDir, callback);

}

//****************************

private Request buildMultipartFormRequest(String url, File[] files,

String[] fileKeys, Param[] params)

{

params = validateParam(params);

MultipartBuilder builder = new MultipartBuilder()

.type(MultipartBuilder.FORM);

for (Param param : params)

{

builder.addPart(Headers.of(“Content-Disposition”, “form-data; name=”" + param.key + “”"),

RequestBody.create(null, param.value));

}

if (files != null)

{

RequestBody fileBody = null;

for (int i = 0; i < files.length; i++)

{

File file = files[i];

String fileName = file.getName();

fileBody = RequestBody.create(MediaType.parse(guessMimeType(fileName)), file);

//TODO 根据文件名设置contentType

builder.addPart(Headers.of(“Content-Disposition”,

“form-data; name=”" + fileKeys[i] + “”; filename=“” + fileName + “”"),

fileBody);

}

}

RequestBody requestBody = builder.build();

return new Request.Builder()

.url(url)

.post(requestBody)

.build();

}

private String guessMimeType(String path)

{

FileNameMap fileNameMap = URLConnection.getFileNameMap();

String contentTypeFor = fileNameMap.getContentTypeFor(path);

if (contentTypeFor == null)

{

contentTypeFor = “application/octet-stream”;

}

return contentTypeFor;

}

private Param[] validateParam(Param[] params)

{

if (params == null)

return new Param[0];

else return params;

}

private Param[] map2Params(Map<String, String> params)

{

if (params == null) return new Param[0];

int size = params.size();

Param[] res = new Param[size];

Set<Map.Entry<String, String>> entries = params.entrySet();

int i = 0;

for (Map.Entry<String, String> entry : entries)

{

res[i++] = new Param(entry.getKey(), entry.getValue());

}

return res;

}

private static final String SESSION_KEY = “Set-Cookie”;

private static final String mSessionKey = “JSESSIONID”;

private Map<String, String> mSessions = new HashMap<String, String>();

private void deliveryResult(final ResultCallback callback, Request request)

{

mOkHttpClient.newCall(request).enqueue(new Callback()

{

@Override

public void onFailure(final Request request, final IOException e)

{

sendFailedStringCallback(request, e, callback);

}

@Override

public void onResponse(final Response response)

{

try

{

final String string = response.body().string();

if (callback.mType == String.class)

{

sendSuccessResultCallback(string, callback);

} else

{

Object o = mGson.fromJson(string, callback.mType);

sendSuccessResultCallback(o, callback);

}

} catch (IOException e)

{

sendFailedStringCallback(response.request(), e, callback);

} catch (com.google.gson.JsonParseException e)//Json解析的错误

{

sendFailedStringCallback(response.request(), e, callback);

}

}

});

}

private void sendFailedStringCallback(final Request request, final Exception e, final ResultCallback callback)

{

mDelivery.post(new Runnable()

{

@Override

public void run()

{

if (callback != null)

callback.onError(request, e);

}

});

}

private void sendSuccessResultCallback(final Object object, final ResultCallback callback)

{

mDelivery.post(new Runnable()

{

@Override

public void run()

{

if (callback != null)

{

callback.onResponse(object);

}

}

});

}

private Request buildPostRequest(String url, Param[] params)

{

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lback != null)

{

callback.onResponse(object);

}

}

});

}

private Request buildPostRequest(String url, Param[] params)

{

自我介绍一下，小编13年上海交大毕业，曾经在小公司待过，也去过华为、OPPO等大厂，18年进入阿里一直到现在。

深知大多数初中级Android工程师，想要提升技能，往往是自己摸索成长或者是报班学习，但对于培训机构动则近万的学费，着实压力不小。自己不成体系的自学效果低效又漫长，而且极易碰到天花板技术停滞不前！

因此收集整理了一份《2024年Android移动开发全套学习资料》，初衷也很简单，就是希望能够帮助到想自学提升又不知道该从何学起的朋友，同时减轻大家的负担。

[外链图片转存中…(img-P8ZfOQTQ-1712144286532)]

[外链图片转存中…(img-NagAwod3-1712144286532)]

[外链图片转存中…(img-7FhYhAxI-1712144286533)]

[外链图片转存中…(img-UhbmmoSb-1712144286533)]

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如果你觉得这些内容对你有帮助，可以扫码获取！！（备注：Android）

总结

Android架构学习进阶是一条漫长而艰苦的道路，不能靠一时激情，更不是熬几天几夜就能学好的，必须养成平时努力学习的习惯。所以：贵在坚持！

上面分享的字节跳动公司2021年的面试真题解析大全，笔者还把一线互联网企业主流面试技术要点整理成了视频和PDF（实际上比预期多花了不少精力），包含知识脉络 + 诸多细节。
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