VisionApiActivity.java

package com.horses.vision.demo;

import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import com.google.api.client.extensions.android.http.AndroidHttp;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.gson.GsonFactory;
import com.google.api.services.vision.v1.Vision;
import com.google.api.services.vision.v1.VisionRequestInitializer;
import com.google.api.services.vision.v1.model.AnnotateImageRequest;
import com.google.api.services.vision.v1.model.BatchAnnotateImagesRequest;
import com.google.api.services.vision.v1.model.BatchAnnotateImagesResponse;
import com.google.api.services.vision.v1.model.Feature;
import com.google.api.services.vision.v1.model.Image;
import com.google.firebase.database.FirebaseDatabase;

import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

    private final String CLOUD_VISION_API_KEY = "AIzaSyCZ--8lMqa7R8dHpDc-YlS6iOs0LJTQeSQ";
    private final String TAG = MainActivity.this.getClass().getSimpleName();

    private ImageView phrase;
    private ImageView human;
    private ImageView cat;
    private TextView result;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        phrase = (ImageView) findViewById(R.id.phrase);
        human = (ImageView) findViewById(R.id.human);
        cat = (ImageView) findViewById(R.id.cat);
        result = (TextView) findViewById(R.id.response);

        phrase.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Log.d(TAG, "Call phrase");
                Bitmap bitmap = ((BitmapDrawable) phrase.getDrawable()).getBitmap();
                callCloudVision(bitmap);
            }
        });

        human.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Log.d(TAG, "Call human");
                Bitmap bitmap = ((BitmapDrawable) human.getDrawable()).getBitmap();
                callCloudVision(bitmap);
            }
        });

        cat.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Log.d(TAG, "Call cat");
                Bitmap bitmap = ((BitmapDrawable) cat.getDrawable()).getBitmap();
                callCloudVision(bitmap);
            }
        });
    }

    private void callCloudVision(final Bitmap bitmap){

        new AsyncTask<Object, Void, String>() {
            @Override
            protected String doInBackground(Object... params) {

                try {

                    //Init protocol
                    HttpTransport httpTransport = AndroidHttp.newCompatibleTransport();
                    JsonFactory jsonFactory = GsonFactory.getDefaultInstance();

                    //Instantiate Vision
                    Vision.Builder builder = new Vision.Builder(httpTransport, jsonFactory, null);
                    builder.setVisionRequestInitializer(new VisionRequestInitializer(CLOUD_VISION_API_KEY));
                    Vision vision = builder.build();

                    //Create request
                    BatchAnnotateImagesRequest batchAnnotateImagesRequest = new BatchAnnotateImagesRequest();
                    batchAnnotateImagesRequest.setRequests(new ArrayList<AnnotateImageRequest>() {{

                        AnnotateImageRequest annotateImageRequest = new AnnotateImageRequest();

                        Image base64EncodedImage = new Image();

                        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
                        bitmap.compress(Bitmap.CompressFormat.JPEG, 90, byteArrayOutputStream);
                        byte[] imageBytes = byteArrayOutputStream.toByteArray();

                        base64EncodedImage.encodeContent(imageBytes);
                        annotateImageRequest.setImage(base64EncodedImage);

                        annotateImageRequest.setFeatures(new ArrayList<Feature>() {{
                            Feature labelDetection = new Feature();
                            //labelDetection.setType("LABEL_DETECTION");
                            labelDetection.setType("TEXT_DETECTION|");
                            labelDetection.setMaxResults(10);
                            add(labelDetection);
                        }});

                        add(annotateImageRequest);
                    }});

                    //Add properties
                    Vision.Images.Annotate annotateRequest = vision.images().annotate(batchAnnotateImagesRequest);
                    annotateRequest.setDisableGZipContent(true);

                    BatchAnnotateImagesResponse response = annotateRequest.execute();

                    return response.toString();
                }
                catch (Exception e) {

                    Log.e(TAG, "failed to make API request because " + e.toString());
                }

                return null;
            }

            @Override
            protected void onPostExecute(String response) {
                super.onPostExecute(response);

                Log.d(TAG, response);
                result.setText(response);

                FirebaseDatabase fire = FirebaseDatabase.getInstance();

                fire.getReference().push().setValue(response);
            }
        }.execute();
    }
}