if (instance == null) {

synchronized (HttpManager.class) {

if (mOkHttpClient == null)

mOkHttpClient = new OkHttpClient();

if (instance == null)

instance = new HttpManager();

initOkHttpClient();

}

}

}

return instance;

}

/**

• 设置请求超时

*/

private static void initOkHttpClient() {

File sdcache = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + “/cache”);

int cacheSize = 10 * 1024 * 1024;

OkHttpClient.Builder builder = new OkHttpClient.Builder()

.connectTimeout(15, TimeUnit.SECONDS)

.writeTimeout(20, TimeUnit.SECONDS)

.readTimeout(20, TimeUnit.SECONDS)

.cache(new Cache(sdcache.getAbsoluteFile(), cacheSize));

mOkHttpClient = builder.build();

}

/**

• get异步请求

*/

public void getAsynHttp(final int what, final HttpCallBack httpCallBack, final String httpUrl) {

Request.Builder requestBuilder = new Request.Builder().url(httpUrl);

requestBuilder.method(“GET”, null);

Request request = requestBuilder.build();

Call mcall = mOkHttpClient.newCall(request);

mcall.enqueue(new Callback() {

@Override

public void onFailure(Call call, IOException e) {

httpCallBack.onFailure(what, e.toString());

}

@Override

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

httpCallBack.onResponse(what, response.body().string());

}

});

}

/**

• post异步请求

*/

public void postAsynHttp(final int what, final HttpCallBack httpCallBack, final String httpUrl, final Map<String, String> stringMap) {

FormBody.Builder formBody = new FormBody.Builder();

for (String key : stringMap.keySet()) {

formBody.add(key, stringMap.get(key));

}

Request request = new Request.Builder()

.url(httpUrl)

.post(formBody.build())

.build();

Call call = mOkHttpClient.newCall(request);

call.enqueue(new Callback() {

@Override

public void onFailure(Call call, IOException e) {

httpCallBack.onFailure(what, e.toString());

}

@Override

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

httpCallBack.onResponse(what, response.body().string());

}

});

}

/**

• 异步下载文件

*/

public void downAsynFile(final int what, final HttpCallBack httpCallBack, final String httpFilePath, final String filePath) {

Request request = new Request.Builder().url(httpFilePath).build();

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

@Override

public void onFailure(Call call, IOException e) {

httpCallBack.onFailure(what, e.toString());

}

@Override

public void onResponse(Call call, Response response) {

InputStream inputStream = response.body().byteStream();

FileOutputStream fileOutputStream = null;

try {

fileOutputStream = new FileOutputStream(new File(filePath));

byte[] buffer = new byte[5 * 1024 * 1024];

int len = 0;

while ((len = inputStream.read(buffer)) != -1) {

fileOutputStream.write(buffer, 0, len);

}

fileOutputStream.flush();

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