OkHttp的封装

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导入依赖：

compile 'com.squareup.okio:okio:1.5.0'
compile 'com.squareup.okhttp3:okhttp:3.9.0'
compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'

权限：

<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>

不要忘记在清单中配置MyApp

OkHttp3Utils的封装
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import okhttp3.Cache;
import okhttp3.CacheControl;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.Interceptor;
import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
import okhttp3.logging.HttpLoggingInterceptor;

/**
* 1. 类的用途封装OkHttp3的工具类用单例设计模式
* 2. @author forever
* 3. @date 2017/9/6 09:19
*/

public class OkHttp3Utils {
/**
* 懒汉安全加同步
* 私有的静态成员变量只声明不创建
* 私有的构造方法
* 提供返回实例的静态方法
*/

private static OkHttp3Utils okHttp3Utils = null;

private OkHttp3Utils() {
}

public static OkHttp3Utils getInstance() {
if (okHttp3Utils == null) {
//加同步安全
synchronized (OkHttp3Utils.class) {
if (okHttp3Utils == null) {
okHttp3Utils = new OkHttp3Utils();
}
}

}

return okHttp3Utils;
}

private static OkHttpClient okHttpClient = null;

public synchronized static OkHttpClient getOkHttpClient() {
if (okHttpClient == null) {
//判空为空创建实例
// okHttpClient = new OkHttpClient();
/**
* 和OkHttp2.x有区别的是不能通过OkHttpClient直接设置超时时间和缓存了，而是通过OkHttpClient.Builder来设置，
* 通过builder配置好OkHttpClient后用builder.build()来返回OkHttpClient，
* 所以我们通常不会调用new OkHttpClient()来得到OkHttpClient，而是通过builder.build()：
*/
// File sdcache = getExternalCacheDir();
//缓存目录
File sdcache = new File(Environment.getExternalStorageDirectory(), "cache");
int cacheSize = 10 * 1024 * 1024;
//OkHttp3拦截器
HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor(new HttpLoggingInterceptor.Logger() {
@Override
public void log(String message) {
Log.i("xxx", message.toString());
}
});
//Okhttp3的拦截器日志分类 4种
httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);

okHttpClient = new OkHttpClient.Builder().connectTimeout(15, TimeUnit.SECONDS)
//添加OkHttp3的拦截器
.addInterceptor(httpLoggingInterceptor)
.addNetworkInterceptor(new CacheInterceptor())
.writeTimeout(20, TimeUnit.SECONDS).readTimeout(20, TimeUnit.SECONDS)
.cache(new Cache(sdcache.getAbsoluteFile(), cacheSize))
.build();
}
return okHttpClient;
}

private static Handler mHandler = null;

public synchronized static Handler getHandler() {
if (mHandler == null) {
mHandler = new Handler();
}

return mHandler;
}

/**
* get请求
* 参数1 url
* 参数2 回调Callback
*/

public static void doGet(String url, Callback callback) {

//创建OkHttpClient请求对象
OkHttpClient okHttpClient = getOkHttpClient();
//创建Request
Request request = new Request.Builder().url(url).build();
//得到Call对象
Call call = okHttpClient.newCall(request);
//执行异步请求
call.enqueue(callback);

}

/**
* post请求
* 参数1 url
* 参数2 回调Callback
*/

public static void doPost(String url, Map<String, String> params, Callback callback) {

//创建OkHttpClient请求对象
OkHttpClient okHttpClient = getOkHttpClient();
//3.x版本post请求换成FormBody 封装键值对参数

FormBody.Builder builder = new FormBody.Builder();
//遍历集合
for (String key : params.keySet()) {
builder.add(key, params.get(key));

}

//创建Request
Request request = new Request.Builder().url(url).post(builder.build()).build();

Call call = okHttpClient.newCall(request);
call.enqueue(callback);

}

/**
* post请求上传文件
* 参数1 url
* 参数2 回调Callback
*/
public static void uploadPic(String url, File file, String fileName) {
//创建OkHttpClient请求对象
OkHttpClient okHttpClient = getOkHttpClient();
//创建RequestBody 封装file参数
RequestBody fileBody = RequestBody.create(MediaType.parse("application/octet-stream"), file);
//创建RequestBody 设置类型等
RequestBody requestBody = new MultipartBody.Builder().setType(MultipartBody.FORM).addFormDataPart("file", fileName, fileBody).build();
//创建Request
Request request = new Request.Builder().url(url).post(requestBody).build();

//得到Call
Call call = okHttpClient.newCall(request);
//执行请求
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {

}

@Override
public void onResponse(Call call, Response response) throws IOException {
//上传成功回调目前不需要处理
}
});

}

/**
* Post请求发送JSON数据
* 参数一：请求Url
* 参数二：请求的JSON
* 参数三：请求回调
*/
public static void doPostJson(String url, String jsonParams, Callback callback) {
RequestBody requestBody = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), jsonParams);
Request request = new Request.Builder().url(url).post(requestBody).build();
Call call = getOkHttpClient().newCall(request);
call.enqueue(callback);

}

/**
* 下载文件以流的形式把apk写入的指定文件得到file后进行安装
* 参数一：请求Url
* 参数二：保存文件的路径名
* 参数三：保存文件的文件名
*/
public static void download(final Context context, final String url, final String saveDir) {
Request request = new Request.Builder().url(url).build();
Call call = getOkHttpClient().newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
Log.i("xxx", e.toString());
}

@Override
public void onResponse(Call call, final Response response) throws IOException {

InputStream is = null;
byte[] buf = new byte[2048];
int len = 0;
FileOutputStream fos = null;
try {
is = response.body().byteStream();
//apk保存路径
final String fileDir = isExistDir(saveDir);
//文件
File file = new File(fileDir, getNameFromUrl(url));
fos = new FileOutputStream(file);
while ((len = is.read(buf)) != -1) {
fos.write(buf, 0, len);
}
fos.flush();
//apk下载完成后调用系统的安装方法
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
context.startActivity(intent);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (is != null) is.close();
if (fos != null) fos.close();

}
}
});

}

/**
* @param saveDir
* @return
* @throws IOException 判断下载目录是否存在
*/
public static String isExistDir(String saveDir) throws IOException {
// 下载位置
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {

File downloadFile = new File(Environment.getExternalStorageDirectory(), saveDir);
if (!downloadFile.mkdirs()) {
downloadFile.createNewFile();
}
String savePath = downloadFile.getAbsolutePath();
Log.e("savePath", savePath);
return savePath;
}
return null;
}

/**
* @param url
* @return 从下载连接中解析出文件名
*/
private static String getNameFromUrl(String url) {
return url.substring(url.lastIndexOf("/") + 1);
}

/**
* 为okhttp添加缓存，这里是考虑到服务器不支持缓存时，从而让okhttp支持缓存
*/
private static class CacheInterceptor implements Interceptor {
@Override
public Response intercept(Chain chain) throws IOException {
// 有网络时设置缓存超时时间1个小时
int maxAge = 60 * 60;
// 无网络时，设置超时为1天
int maxStale = 60 * 60 * 24;
Request request = chain.request();
if (NetWorkUtils.isNetWorkAvailable(MyApp.getInstance())) {
//有网络时只从网络获取
request = request.newBuilder().cacheControl(CacheControl.FORCE_NETWORK).build();
} else {
//无网络时只从缓存中读取
request = request.newBuilder().cacheControl(CacheControl.FORCE_CACHE).build();
/* Looper.prepare();
Toast.makeText(MyApp.getInstance(), "走拦截器缓存", Toast.LENGTH_SHORT).show();
Looper.loop();*/
}
Response response = chain.proceed(request);
if (NetWorkUtils.isNetWorkAvailable(MyApp.getInstance())) {
response = response.newBuilder()
.removeHeader("Pragma")
.header("Cache-Control", "public, max-age=" + maxAge)
.build();
} else {
response = response.newBuilder()
.removeHeader("Pragma")
.header("Cache-Control", "public, only-if-cached, max-stale=" + maxStale)
.build();
}
return response;
}
}
}

GsonObjectCallback的封装

import android.os.Handler;

import com.google.gson.Gson;

import java.io.IOException;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;

/**
* 1. 类的用途如果要将得到的json直接转化为集合建议使用该类
* 该类的onUi() onFailed()方法运行在主线程
* 2. @author forever
* 3. @date 2017/9/24 18:47
*/

public abstract class GsonObjectCallback<T> implements Callback {
private Handler handler = OkHttp3Utils.getInstance().getHandler();

//主线程处理
public abstract void onUi(T t);

//主线程处理
public abstract void onFailed(Call call, IOException e);

//请求失败
@Override
public void onFailure(final Call call, final IOException e) {
handler.post(new Runnable() {
@Override
public void run() {
onFailed(call, e);
}
});
}

//请求json 并直接返回泛型的对象主线程处理
@Override
public void onResponse(Call call, Response response) throws IOException {
String json = response.body().string();
Class<T> cls = null;

Class clz = this.getClass();
ParameterizedType type = (ParameterizedType) clz.getGenericSuperclass();
Type[] types = type.getActualTypeArguments();
cls = (Class<T>) types[0];
Gson gson = new Gson();
final T t = gson.fromJson(json, cls);
handler.post(new Runnable() {
@Override
public void run() {
onUi(t);
}
});
}
}

GsonArrayCallback的封装

import android.os.Handler;

import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;

import java.io.IOException;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;

/**
* 1. 类的用途如果要将得到的json直接转化为集合建议使用该类
* 该类的onUi() onFailed()方法运行在主线程
* 2. @author forever
* 3. @date 2017/9/24 18:47
*/

public abstract class GsonArrayCallback<T> implements Callback {
private Handler handler = OkHttp3Utils.getInstance().getHandler();

//主线程处理
public abstract void onUi(List<T> list);

//主线程处理
public abstract void onFailed(Call call, IOException e);

//请求失败
@Override
public void onFailure(final Call call, final IOException e) {
handler.post(new Runnable() {
@Override
public void run() {
onFailed(call, e);
}
});
}

//请求json 并直接返回集合主线程处理
@Override
public void onResponse(Call call, Response response) throws IOException {
final List<T> mList = new ArrayList<T>();

String json = response.body().string();
JsonArray array = new JsonParser().parse(json).getAsJsonArray();

Gson gson = new Gson();

Class<T> cls = null;
Class clz = this.getClass();
ParameterizedType type = (ParameterizedType) clz.getGenericSuperclass();
Type[] types = type.getActualTypeArguments();
cls = (Class<T>) types[0];

for(final JsonElement elem : array){
//循环遍历把对象添加到集合
mList.add((T) gson.fromJson(elem, cls));
}

handler.post(new Runnable() {
@Override
public void run() {
onUi(mList);

}
});

}
}

最后还需要一个MyApp的封装

import android.app.Application;

/**
* 1. 类的用途
* 2. @author forever
* 3. @date 2017/9/8 12:33
*/

public class MyApp extends Application {
public static MyApp mInstance;
@Override
public void onCreate() {
super.onCreate();
mInstance = this;

}
public static MyApp getInstance() {
return mInstance;
}
}

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