How to use Google Drive SDK in Android project with hardcoded credentials

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Ok, I’ve found solution for my problem.

Of course my app is an Android one, I dont’n want make user to log in/use any credentials to connect to my Drive, and lastly I can manipulate files using default Drive web app.

  1. Seps need to be taken: Create service account as in this
    example.
  2. Download private key API Access site and put it eg. in
    assets folder.
  3. Download and import these libraries:
    • google-api-client-1.13.2-beta.jar
    • google-api-client-android-1.13.2-beta.jar
    • google-api-services-drive-v2-rev60-1.13.2-beta.jar
    • google-http-client-1.13.1-beta.jar
    • google-http-client-android-1.13.1-beta.jar
    • google-http-client-gson-1.13.1-beta.jar
    • google-http-client-jackson2-1.13.1-beta.jar
    • google-oauth-client-1.13.1-beta.jar
    • gson-2.1.jar
    • guava-jdk5-13.0.jar
    • jackson-core-2.0.5.jar
    • jsr305-1.3.9.jar

  4. Implement Drive service getter:

    public Drive getDriveService() throws GeneralSecurityException, IOException, URISyntaxException {
    HttpTransport httpTransport = new NetHttpTransport();
    JacksonFactory jsonFactory = new JacksonFactory();
    GoogleCredential credential = new GoogleCredential.Builder()
        .setTransport(httpTransport)
        .setJsonFactory(jsonFactory)
        .setServiceAccountId(G_SERVICE_EMAIL)
        .setServiceAccountScopes(DriveScopes.DRIVE)
        .setServiceAccountPrivateKeyFromP12File(PKC_12_FILE)
        .build();
    Drive service = new Drive.Builder(httpTransport, jsonFactory, null)
        .setHttpRequestInitializer(credential)
        .build();
    return service;
}

    Where G_SERVICE_EMAIL is email address from API Access site and PKC_12_FILE is previously downloaded private key.

  5. Allow your service to access folder from your Drive: in sharing options of the folder in Drive app allow user with email: G_SERVICE_EMAIL read/write access.

    PKC FILE INTEGRATION

    private File getTempPkc12File() throws IOException {
    InputStream pkc12Stream = getAssets().open("this-is-your-unique-hash-privatekey.p12");
    File tempPkc12File = File.createTempFile("temp_pkc12_file", "p12");
    OutputStream tempFileStream = new FileOutputStream(tempPkc12File);

    int read = 0;
    byte[] bytes = new byte[1024];
    while ((read = pkc12Stream.read(bytes)) != -1) {
        tempFileStream.write(bytes, 0, read);
    }
    return tempPkc12File;
}

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