How to retrieve data from google drive hidden app folder?

Question

I am creating a app in which I store the user information in the user drive hidden app folder. However when I try to retrieve that information it's gives an Exception. Below is my sample code and If you have any other solution so, please provide me. Thanks in Advance

private void getDataFromDrive(){
        GoogleApiClient mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .addApi(Drive.API)
            .addScope(Drive.SCOPE_FILE)
            .build();
    Drive.DriveApi.requestSync(mGoogleApiClient).setResultCallback(syncCallBack);

    }


private ResultCallback<Status> syncCallBack = new ResultCallback<Status>() {

            @Override
            public void onResult(@NonNull Status status) {
                if (!status.isSuccess()) {
                    if (DriveStatusCodes.DRIVE_RATE_LIMIT_EXCEEDED == status.getStatusCode()) {
                        //intimate user to wait for some time if you want to
                    }
                }
                //now query db file from google drive's app folder
                queryMethod();
            }
        };

    private void queryMethod() {

        Query query = new Query.Builder()
                .addFilter(Filters.eq(SearchableField.TITLE, "New file.txt"))
                .build();
        Task<MetadataBuffer> queryTask = getDriveResourceClient().query(query);

        queryTask.addOnSuccessListener(this,
                new OnSuccessListener<MetadataBuffer>() {
                    @Override
                    public void onSuccess(MetadataBuffer metadataBuffer) {
                        Log.e(TAG, "retrieving files");
                        showMessage(getString(R.string.query_pass));
                        finish();
                    }
                })
                .addOnFailureListener(this, new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        Log.e(TAG, "---->Enter In Open File Fail");
                        Log.e(TAG, "Error retrieving files");
                        showMessage(getString(R.string.query_failed));
                        finish();
                    }
                });

    }

Exception:

 java.lang.IllegalStateException: GoogleApiClient is not connected yet.
        at com.google.android.gms.common.api.internal.zzba.zze(Unknown Source)
        at com.google.android.gms.internal.zzbls.requestSync(Unknown Source)
        at com.cloudbackupdemo.BaseDemoActivity.getDataFromDrive(BaseDemoActivity.java:179)
        at com.cloudbackupdemo.BaseDemoActivity.onClick(BaseDemoActivity.java:161)
        at android.view.View.performClick(View.java:5201)
        at android.view.View$PerformClick.run(View.java:21163)
        at android.os.Handler.handleCallback(Handler.java:746)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:148)
        at android.app.ActivityThread.main(ActivityThread.java:5443)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)