Can we retrieve data back from Google Drive API in Android?

Question

I'm able to successfully add my images to google drive, using the API provided by Google Drive.

Can I now retrieve it back to my App? If yes, Can anyone help with how to do that?

Answer 1

Use this to retrieve files from the Google Drive API

https://www.googleapis.com/drive/v3/files/[FILEID]?key=[YOUR_API_KEY]'

If you want the entirety of code required to retrieve a file, here it is:

import com.google.api.client.http.GenericUrl;
import com.google.api.client.http.HttpResponse;
import com.google.api.services.drive.Drive;
import com.google.api.services.drive.model.File;

import java.io.IOException;
import java.io.InputStream;

// ...

public class MyClass {

  // ...

  /**
   * Print a file's metadata.
   *
   * @param service Drive API service instance.
   * @param fileId ID of the file to print metadata for.
   */
  private static void printFile(Drive service, String fileId) {

    try {
      File file = service.files().get(fileId).execute();

      System.out.println("Title: " + file.getTitle());
      System.out.println("Description: " + file.getDescription());
      System.out.println("MIME type: " + file.getMimeType());
    } catch (IOException e) {
      System.out.println("An error occurred: " + e);
    }
  }

  /**
   * Download a file's content.
   *
   * @param service Drive API service instance.
   * @param file Drive File instance.
   * @return InputStream containing the file's content if successful,
   *         {@code null} otherwise.
   */
  private static InputStream downloadFile(Drive service, File file) {
    if (file.getDownloadUrl() != null && file.getDownloadUrl().length() > 0) {
      try {
        HttpResponse resp =
            service.getRequestFactory().buildGetRequest(new GenericUrl(file.getDownloadUrl()))
                .execute();
        return resp.getContent();
      } catch (IOException e) {
        // An error occurred.
        e.printStackTrace();
        return null;
      }
    } else {
      // The file doesn't have any content stored on Drive.
      return null;
    }
  }

  // ...
}