Google drive android API unable to retrieve file content

Question

Hi guys i plan at my android side to retrieve some documents file from my google drive,but always failed mention:

Drive item not found, or you are not authorized to access it.

Here is my code the problem part is the "EXISTING_FILE_ID "

private static final String EXISTING_FILE_ID = "0BxyOMAFcmxoYTkt6cHZwcUtaNlU";
private static final int REQUEST_CODE = 102;
private GoogleApiClient googleApiClient;
private static final String TAG = "retrieve_contents";

First:i tried to get my shared documents link at google drive and pick the key values example,0BxyOMAFcmxoYTkt6cHZwcUtaNlU https://drive.google.com/file/d/0BxyOMAFcmxoYTkt6cHZwcUtaNlU/view?usp=sharing

Second:i use my android side application to create a file,and retrieved a DriveId:CAESABiiHyCcwq2SpVMoAA== but still unable to retrieve file content this problem confused me Several days does some one help me ?

Answer 1

From the fact that you mention 'EXISTING_FILE_ID', I assume you are referring to the demo code here.

So, to answer the point called 'First' above: The error tells you that you're trying to access a file, not created by your Android app. GDAA supports only SCOPE_FILE scope, e.g. only files created by the Android app can by found, opened, modified,...

The point called 'Second': You are (probably) correctly trying to access a file created by your Android app, but using incorrect ID. The ID I'm seeing is a 'DriveId', different from 'ResourceId' you are supposed to use (see SO 29030110 here).

The most immediate solution would be to turn your DriveId into ResourceId by means of

 DriveId driveId = DriveId.decodeFromString("DriveId:CAESABii.....");
 String EXISTING_FILE_ID = driveId.getResourceId();

And try that ID.

Good Luck