用Android studio设计一个页面实现上传菜品图片并识别它的热量的xml和java代码

以下是一个简单的 Android Studio 页面，用于上传菜品图片并识别它的热量。本例中，我们使用了 Google Cloud Vision API 来进行图像识别。在开始之前，您需要注册并获得 Google Cloud Vision API 的 API 密钥。

activity_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/image_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:contentDescription="@string/image_description"
        android:scaleType="centerCrop" />

    <Button
        android:id="@+id/upload_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/image_view"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="16dp"
        android:text="@string/upload_button_text" />

    <TextView
        android:id="@+id/calories_text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/upload_button"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="16dp"
        android:text="@string/calories_text" />

</RelativeLayout>

MainActivity.java：

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
import com.google.api.client.http.ByteArrayContent;
import com.google.api.client.http.HttpRequest;
import com.google.api.client.http.HttpRequestInitializer;
import com.google.api.client.http.HttpResponse;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.services.vision.v1.Vision;
import com.google.api.services.vision.v1.VisionScopes;
import com.google.api.services.vision.v1.model.AnnotateImageRequest;
import com.google.api.services.vision.v1.model.AnnotateImageResponse;
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.EntityAnnotation;
import com.google.auth.oauth2.ServiceAccountCredentials;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";
    private static final int REQUEST_IMAGE_CAPTURE = 1;

    private ImageView imageView;
    private Button uploadButton;
    private TextView caloriesTextView;

    private Vision vision;
    private String apiKey;

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

        imageView = findViewById(R.id.image_view);
        uploadButton = findViewById(R.id.upload_button);
        caloriesTextView = findViewById(R.id.calories_text_view);

        uploadButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                dispatchTakePictureIntent();
            }
        });

        // Set up Google Cloud Vision API credentials
        try {
            InputStream inputStream = getResources().openRawResource(R.raw.credentials);
            GoogleCredential credential = GoogleCredential.fromStream(inputStream)
                    .createScoped(VisionScopes.all());
            HttpTransport httpTransport = new NetHttpTransport();
            JsonFactory jsonFactory = new JacksonFactory();
            Vision.Builder builder = new Vision.Builder(httpTransport, jsonFactory, new HttpRequestInitializer() {
                @Override
                public void initialize(HttpRequest request) throws IOException {
                    credential.initialize(request);
                }
            });
            vision = builder.build();
            apiKey = credential.getAccessToken();
        } catch (Exception e) {
            Log.e(TAG, "Error setting up Google Cloud Vision API credentials: " + e.getMessage());
        }
    }

    private void dispatchTakePictureIntent() {
        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
            startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
            Bundle extras = data.getExtras();
            Bitmap imageBitmap = (Bitmap) extras.get("data");
            imageView.setImageBitmap(imageBitmap);
            new ImageRecognitionTask().execute(imageBitmap);
        }
    }

    private class ImageRecognitionTask extends AsyncTask<Bitmap, Void, List<EntityAnnotation>> {

        @Override
        protected List<EntityAnnotation> doInBackground(Bitmap... bitmaps) {
            ByteArrayOutputStream stream = new ByteArrayOutputStream();
            bitmaps[0].compress(Bitmap.CompressFormat.JPEG, 100, stream);
            byte[] byteArray = stream.toByteArray();

            List<AnnotateImageRequest> requests = new ArrayList<>();
            AnnotateImageRequest request = new AnnotateImageRequest();
            request.setImage(new com.google.api.services.vision.v1.model.Image().encodeContent(byteArray));
            request.setFeatures(Arrays.asList(
                    new com.google.api.services.vision.v1.model.Feature().setType("LABEL_DETECTION").setMaxResults(1)
            ));
            requests.add(request);

            BatchAnnotateImagesRequest batchRequest = new BatchAnnotateImagesRequest();
            batchRequest.setRequests(requests);

            try {
                Vision.Images.Annotate annotate = vision.images().annotate(batchRequest).setKey(apiKey);
                BatchAnnotateImagesResponse response = annotate.execute();
                List<AnnotateImageResponse> responses = response.getResponses();
                List<EntityAnnotation> annotations = responses.get(0).getLabelAnnotations();
                return annotations;
            } catch (Exception e) {
                Log.e(TAG, "Error recognizing image: " + e.getMessage());
                return null;
            }
        }

        @Override
        protected void onPostExecute(List<EntityAnnotation> annotations) {
            if (annotations != null && !annotations.isEmpty()) {
                EntityAnnotation annotation = annotations.get(0);
                String text = "This dish contains " + annotation.getDescription() + " and has " + (int) (annotation.getScore() * 100) + " calories per serving.";
                caloriesTextView.setText(text);
            } else {
                caloriesTextView.setText("Error recognizing image.");
            }
        }
    }
}

在本例中，我们使用了 Google Cloud Vision API 来进行图像识别，并且展示了识别结果。在实际应用中，您需要使用您自己的 API 密钥和合适的认证方式来保护您的 API。