如何使用AsyncHttpClient和base 64编码的字符串从Web API请求JSON数据？

Question

public static String[] makeRequest(String uri, String base64encodedImage) throws IOException {

        final JSONObject[] json = {new JSONObject()};

        String data ="";
        final String[] result = new String[1];
        //URL _url = new URL(uri);

        final AsyncHttpClient[] httpClient = {new AsyncHttpClient()};
        httpClient[0].addHeader("Content-type", "application/json");
        httpClient[0].setUserAgent("GYUserAgentAndroid");
        String jsonParamsString = "{\"key\":\"value\"}";
        RequestParams requestParams = new RequestParams("request", jsonParamsString);
        httpClient[0].put(uri, requestParams, new JsonHttpResponseHandler()
                {
                    @Override
                    public void onSuccess(int statusCode, Header[] headers, JSONObject response) {
                        super.onSuccess(statusCode, headers, response);
                        result[0] = response.toString();
                        //Toast toast = Toast.makeText(this.getBaseContext(), response.toString(), Toast.LENGTH_LONG);
                        //toast.show();
                    }

                    @Override
                    public void onFailure(int statusCode, Header[] headers, Throwable throwable, JSONObject errorResponse) {
                        super.onFailure(statusCode, headers, throwable, errorResponse);
                        result[0] = "failed";
                    }
                }
        );

        try {
            json[0].put( "imageData", base64encodedImage);
        } catch (JSONException e) {
            e.printStackTrace();
        }
        //json.put( "caption", );

        return result;

我正在尝试使用Android设备从名为Calorie Mama（https://dev.caloriemama.ai/docs）的API获取JSON数据。我必须将图像发送到API，我已经将图像转换为基本的64编码字符串。但是，我没有从API获取任何数据。这是应该接收数据的类，但它不起作用。如果你能告诉我为什么会很棒。我是android开发的新手。 :(

下面的活动实例化了makeRequest类。

package com.example.takeimage;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Base64;
import android.widget.TextView;
import android.widget.Toast;

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Iterator;
import java.util.Map;

public class Evaluate extends AppCompatActivity {
    String base64encodedImage;
    String baseURI = "https://api-2445582032290.production.gw.apicast.io/v1/foodrecognition?user_key=[my Api Key]";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_evaluate);
        Bundle bundle = getIntent().getExtras();
        String message = bundle.getString("message");
        Bitmap bm = BitmapFactory.decodeFile(message);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        bm.compress(Bitmap.CompressFormat.JPEG, 100, baos); //bm is the bitmap object
        byte[] b = baos.toByteArray();

        base64encodedImage = Base64.encodeToString(b, Base64.DEFAULT);

        makeRequest newRequest = new makeRequest();
        String[] result= null;
        try {
            result = newRequest.makeRequest(baseURI, base64encodedImage);
        } catch (IOException e) {
            e.printStackTrace();
        }

        Toast toast = Toast.makeText(this.getApplicationContext(), result[0], Toast.LENGTH_LONG);
        toast.show();

        //TextView txtView = (TextView) findViewById(R.id.textEvaluate);
        //txtView.setText(base64encodedImage);
    }
    protected void response(){
        final String url = baseURI + "/postformdata";
    }


}