compile 'com.squareup.okhttp3:okhttp:3.4.1'

protected void post_file(final String url, final Map<String, Object> map, File file) {    OkHttpClient client = new OkHttpClient();    // form 表單形式上傳    MultipartBody.Builder requestBody = new MultipartBody.Builder().setType(MultipartBody.FORM);    if(file != null){      // MediaType.parse() 里面是上傳的文件類型。      RequestBody body = RequestBody.create(MediaType.parse("image/*"), file);      String filename = file.getName();      // 參數分別為， 請求key ，文件名稱 ， RequestBody      requestBody.addFormDataPart("headImage", file.getName(), body);    }    if (map != null) {      // map 里面是請求中所需要的 key 和 value      for (Map.Entry entry : map.entrySet()) {        requestBody.addFormDataPart(valueOf(entry.getKey()), valueOf(entry.getValue()));      }    }    Request request = new Request.Builder().url("請求地址").post(requestBody.build()).tag(context).build();    // readTimeout("請求超時時間" , 時間單位);    client.newBuilder().readTimeout(5000, TimeUnit.MILLISECONDS).build().newCall(request).enqueue(new Callback() {      @Override      public void onFailure(Call call, IOException e) {        Log.i("lfq" ,"onFailure");      }      @Override      public void onResponse(Call call, Response response) throws IOException {        if (response.isSuccessful()) {          String str = response.body().string();          Log.i("lfq", response.message() + " , body " + str);        } else {          Log.i("lfq" ,response.message() + " error : body " + response.body().string());        }      }    });  }

FormBody.Builder formBody = new FormBody.Builder();if (map != null) {  for (Map.Entry entry : map.entrySet()) {    formBody.add(String.valueOf(entry.getKey()),String.valueOf(entry.getValue()));  }}