How to get your Google Drive account name

I am using the Google Drive API for a CRUD file. Everything works fine, but I can't get the Google Drive account name in the onActivityResult () method. My code looks like this:

In onCreate()

:

String[] accountTypes = new String[]{"com.google"};
                        Intent intent = AccountPicker.newChooseAccountIntent(null, null,
                                accountTypes, false, null, null, null, null);
                        startActivityForResult(intent, REQ_AUTH);

      

        
        
        
      

    

In onAcivityResult()

:

protected void onActivityResult(final int rqst, final int rslt,
                    final Intent data) {
                if ((rqst == REQ_AUTH) && (rslt == Activity.RESULT_OK)) {

                    accountName = data.getStringExtra(AccountManager.KEY_ACCOUNT_NAME);

                    if (accountName != null) {
                        googleApiClient.init(UploadFileOnGoogleDrive.this, accountName)
                                .connect();
                    }
                }

      

        
        
        
      

    

It data.getStringExtra(AccountManager.KEY_ACCOUNT_NAME)

always comes back here null

. I also put a condition like d ata!=null && data.getStringExtras()!=null

, but the condition will never be met. Please help me.