下面是一个使用Android的示例代码，该代码可以保存从URL加载的图像到设备的存储器中。

import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Environment;
import android.widget.Toast;

import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class SaveImageListener {

    private Context context;
    private String imageUrl;

    public SaveImageListener(Context context, String imageUrl) {
        this.context = context;
        this.imageUrl = imageUrl;
    }

    public void saveImage() {
        if (ContextCompat.checkSelfPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions((Activity) context,
                    new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
        } else {
            new SaveImageTask().execute(imageUrl);
        }
    }

    private class SaveImageTask extends AsyncTask {

        @Override
        protected Boolean doInBackground(String... params) {
            String imageUrl = params[0];
            Bitmap imageBitmap = null;
            try {
                URL url = new URL(imageUrl);
                HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                connection.setDoInput(true);
                connection.connect();
                InputStream input = connection.getInputStream();
                imageBitmap = BitmapFactory.decodeStream(input);
            } catch (IOException e) {
                e.printStackTrace();
            }

            if (imageBitmap != null) {
                String savedImagePath = saveImageToStorage(imageBitmap);
                return savedImagePath != null;
            } else {
                return false;
            }
        }

        @Override
        protected void onPostExecute(Boolean result) {
            if (result) {
                Toast.makeText(context, "Image saved successfully", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(context, "Failed to save image", Toast.LENGTH_SHORT).show();
            }
        }
    }

    private String saveImageToStorage(Bitmap bitmap) {
        String savedImagePath = null;

        String imageFileName = "image.jpg";
        File storageDir = new File(Environment.getExternalStorageDirectory(), "MyApp");
        boolean success = true;
        if (!storageDir.exists()) {
            success = storageDir.mkdirs();
        }

        if (success) {
            File imageFile = new File(storageDir, imageFileName);
            savedImagePath = imageFile.getAbsolutePath();
            try {
                FileOutputStream outputStream = new FileOutputStream(imageFile);
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
                outputStream.flush();
                outputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        return savedImagePath;
    }
}

要使用这个监听器，可以在相应的活动或片段中实例化它，并在需要保存图像的按钮点击事件中调用saveImage()方法。

String imageUrl = "https://example.com/image.jpg";
SaveImageListener saveImageListener = new SaveImageListener(this, imageUrl);
saveImageListener.saveImage();

在使用此代码时，请确保在Android清单文件中添加适当的权限。