Android中如何通过文件名获取开发者Google Drive特定文件ID？

Hey there! Let's break down your two questions step by step, since they cover different use cases (personal Drive vs. a developer/service account Drive on Android).

Web UI Method (No Code Needed) #

• Open your Google Drive in a web browser and locate the target file.
• Either right-click the file and select "Get link", or open the file directly.
• In the resulting URL, look for the string between d/ and /view (or /edit). That’s your file ID!

  Example URL: https://drive.google.com/file/d/123abcXYZ789/view?usp=sharing → File ID is 123abcXYZ789

Using the Google Drive API (Programmatic Approach) #

If you need to automate this, use the Drive API's files.list endpoint with a filename filter:

1. Enable the Drive API in your Google Cloud Project and set up OAuth 2.0 authentication (for personal accounts).
2. Use the q parameter to filter files: name='YourExactFileName' (case-sensitive by default; use contains instead of = for partial matches).
3. Request only the id and name fields to keep responses lightweight.

Here’s a quick Python example:

from googleapiclient.discovery import build
from google.oauth2.credentials import Credentials

# Load OAuth 2.0 credentials (from a token.json file)
creds = Credentials.from_authorized_user_file('token.json', ['https://www.googleapis.com/auth/drive.readonly'])

# Build the Drive service
drive_service = build('drive', 'v3', credentials=creds)

# Search for the file by name
results = drive_service.files().list(
    q="name='MyTargetFile.pdf'",
    fields="files(id, name)"
).execute()
items = results.get('files', [])

if not items:
    print('No files found.')
else:
    print('Matching files:')
    for item in items:
        print(f'{item["name"]} ({item["id"]})')

Absolutely achievable! This uses a Google Service Account (a dedicated account for your app, separate from user accounts) to access its own isolated Drive storage. Here’s how to set it up:

Prerequisites #

• Create a Service Account in your Google Cloud Project and download its JSON key file.
• Enable the Drive API for your project.
• Ensure target files are stored in the Service Account’s Drive, or shared with the Service Account’s email address.

Android Implementation Steps #

1. Add required dependencies to your app’s module-level build.gradle:

dependencies {
    implementation 'com.google.api-client:google-api-client-android:1.34.1'
    implementation 'com.google.apis:google-api-services-drive:v3-rev20220606-2.0.0'
    implementation 'com.google.oauth-client:google-oauth-client-jetty:1.34.1'
}

2. Load Service Account credentials and authenticate:
   Store the JSON key file in res/raw/ and load it to get a valid credential:

import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.gson.GsonFactory;
import com.google.api.services.drive.Drive;
import com.google.api.services.drive.DriveScopes;

import java.io.InputStream;
import java.util.Collections;

// Inside your Activity/ViewModel
private Drive getDriveService() throws Exception {
    InputStream inputStream = getResources().openRawResource(R.raw.service_account_key);
    
    GoogleCredential credential = GoogleCredential.fromStream(inputStream)
            .createScoped(Collections.singleton(DriveScopes.DRIVE_READONLY));
    
    return new Drive.Builder(
            new NetHttpTransport(),
            GsonFactory.getDefaultInstance(),
            credential)
            .setApplicationName("YourAppName")
            .build();
}

3. Fetch the File ID by Filename
   Use the files.list method with a filename filter (run network operations off the main thread):

import com.google.api.services.drive.model.File;
import com.google.api.services.drive.model.FileList;
import android.util.Log;

private void fetchFileIdByFilename(String targetFilename) {
    new AsyncTask<Void, Void, String>() {
        @Override
        protected String doInBackground(Void... voids) {
            try {
                Drive driveService = getDriveService();
                
                FileList result = driveService.files().list()
                        .setQ("name='" + targetFilename + "'")
                        .setFields("files(id, name)")
                        .execute();
                
                // Return first matching file ID (handle duplicates if needed)
                for (File file : result.getFiles()) {
                    return file.getId();
                }
                return null;
            } catch (Exception e) {
                e.printStackTrace();
                return null;
            }
        }

        @Override
        protected void onPostExecute(String fileId) {
            if (fileId != null) {
                Log.d("DriveService", "Found file ID: " + fileId);
                // Use the ID in your app logic
            } else {
                Log.d("DriveService", "No matching file found");
            }
        }
    }.execute();
}

Key Notes #

• Service Accounts have their own isolated Drive—personal Drive files won’t be accessible unless shared with the Service Account’s email.
• For modern Android, replace AsyncTask with Coroutines or WorkManager for better lifecycle compliance.
• Add extra filters (like mimeType or modifiedTime) if multiple files share the same filename.

内容的提问来源于stack exchange，提问作者user3658352