Develop Reference

Drive Api save to folder, if folder doesnt exist, create than save

im using the Google Drive API to save(use as backup) a database there, its working nice, but just if i use the ROOT
the Api Call:
MetadataChangeSet metadataChangeSet = new MetadataChangeSet.Builder()
......build();
Drive.DriveApi.getRootFolder(mGoogleApiClient)
.createFile(mGoogleApiClient, metadataChangeSet, result.getDriveContents())
.setResultCallback(fileCallback);
CallBack to Save the file:
final public ResultCallback < DriveFolder.DriveFileResult > fileCallback = new
ResultCallback < DriveFolder.DriveFileResult > () {
#Override
public void onResult(DriveFolder.DriveFileResult result) {
if (!result.getStatus().isSuccess()) {
return;
}
Log.i(TAG, "Successfull !");
}
};
i know that i must get the Folder, but if i do this, i need to do a CallBack to call another callback and then save?
isnt any way to directly do .createNewFile inside the FOLDER? without doing another Query for folder, check if the folder exist than create the folder, than use the DriveID, than create the file?

Remember, that in the GooDrive universe, the tree structure (folder, subfolder, ...) is a mirage. The Drive is a flat system of objects (files, folders) where one of the metadata fields is a 'set of parent IDs', that actually forms the notion of parentobject - childobject structure. Actually the classic tree (one parent many children) is not even enforced, so a child object can 'appear' in more that one parent.
This fact explains that you CAN NOT create an OS type of path in one shot. The objects (parents) must be created before their IDs can be plugged into child objects' metadata.
So the only way to do it, is to do what you say:
if folder exists
return it's ID
else
return ID of newly created one
create a child object with parent's ID
... and here is an example how I create a structure of type:
/ MYROOT / 2015 / 2015-12
(where MYROOT, 2015 , 2015-12 are subfloders the Drive root)
new Thread(new Runnable() {
#Override
public void run() {
DriveId Id = getFolder( getFolder( getFolder(
Drive.DriveApi.getRootFolder(mGAC).getDriveId(), "MYROOT"),
"2015",
"2015-12"
);
}
}).start();
GoogleApiClient mGAC;
DriveId getFolder(DriveId parentId, String titl) {
DriveId dId = null;
if (parentId != null && titl != null) try {
ArrayList<Filter> fltrs = new ArrayList<>();
fltrs.add(Filters.in(SearchableField.PARENTS, parentId));
fltrs.add(Filters.eq(SearchableField.TITLE, titl));
fltrs.add(Filters.eq(SearchableField.MIME_TYPE, "application/vnd.google-apps.folder"));
Query qry = new Query.Builder().addFilter(Filters.and(fltrs)).build();
MetadataBuffer mdb = null;
DriveApi.MetadataBufferResult rslt = Drive.DriveApi.query(mGAC, qry).await();
if (rslt.getStatus().isSuccess()) try {
mdb = rslt.getMetadataBuffer();
if (mdb.getCount() > 0)
dId = mdb.get(0).getDriveId();
} catch (Exception ignore) {}
finally { if (mdb != null) mdb.close(); }
if (dId == null) {
MetadataChangeSet meta = new Builder().setTitle(titl).setMimeType(UT.MIME_FLDR).build();
DriveFolderResult r1 = parentId.asDriveFolder().createFolder(mGAC, meta).await();
DriveFolder dFld = (r1 != null) && r1.getStatus().isSuccess() ? r1.getDriveFolder() : null;
if (dFld != null) {
MetadataResult r2 = dFld.getMetadata(mGAC).await();
if ((r2 != null) && r2.getStatus().isSuccess()) {
dId = r2.getMetadata().getDriveId();
}
}
}
} catch (Exception e) { e.printStackTrace(); }
return dId;
}
In the 'mdb.get(0).getDriveId()' area, you can see how hacky it gets when you try to impose a classic tree structure on the Drive. The search here can return multiple objects with the same name, so I use the first one. There should be some kind of error reporting here.
As you can see it is possible to replace callbacks with the 'await()' method, flattening the code into a classic DOS style spaghetti code as long as you place the whole sequence off-UI thread (asynctask, thread, ....)
Still, more elegant (IMO) option to accomplish this is to use recursive call from the result callback.
fromPath(Drive.DriveApi.getRootFolder(mGAC).getDriveId(), "MYROOT/2015/2015-12/file.jpg");
....
void fromPath(final DriveId parentId, final String path) {
if (parentId != null && path != null) {
final int idx = path.indexOf('/');
if (idx < 0) {
// reached last path item - probably file name
// CREATE FILE WITH patentID AND QUIT
return; //--- DONE -------------------->>>
}
final String titl = path.substring(0, idx);
ArrayList<Filter> fltrs = new ArrayList<>();
fltrs.add(Filters.in(SearchableField.PARENTS, parentId));
fltrs.add(Filters.eq(SearchableField.TITLE, titl));
fltrs.add(Filters.eq(SearchableField.MIME_TYPE, UT.MIME_FLDR));
Query qry = new Query.Builder().addFilter(Filters.and(fltrs)).build();
Drive.DriveApi.query(mGAC, qry).setResultCallback(new ResultCallback<DriveApi.MetadataBufferResult>() {
#Override
public void onResult(DriveApi.MetadataBufferResult rslt) {
MetadataBuffer mdb = null;
if (rslt != null && rslt.getStatus().isSuccess()) {
try {
mdb = rslt.getMetadataBuffer();
for (Metadata md : mdb) {
if (md.isTrashed()) continue;
fromPath(md.getDriveId(), path.substring(idx + 1));
return; //+++ first found, NEXT +++++++>>>
}
} finally { if (mdb != null) mdb.close(); }
}
MetadataChangeSet meta = new Builder().setTitle(titl).setMimeType(UT.MIME_FLDR).build();
parentId.asDriveFolder().createFolder(mGAC, meta)
.setResultCallback(new ResultCallback<DriveFolderResult>() {
#Override
public void onResult(DriveFolderResult rslt) {
DriveFolder dFld = rslt != null && rslt.getStatus().isSuccess() ? rslt.getDriveFolder() : null;
if (dFld != null) {
dFld.getMetadata(mGAC).setResultCallback(new ResultCallback<MetadataResult>() {
#Override
public void onResult(MetadataResult rslt) {
if (rslt != null && rslt.getStatus().isSuccess()) {
fromPath(rslt.getMetadata().getDriveId(), path.substring(idx + 1));
return; //+++ created, NEXT +++++++>>>
}
}
});
}
}
});
}
});
}
}
A WORD OF CAUTION:
As I called this sequence repeatedly, using the last DriveId (like 2015-12) as a parent of a JPEG image file, I have experienced weird behavior, like suddenly getting a 'null' result from 'Drive.DriveApi.getRootFolder(mGAC).getDriveId()'. It shouldn't happen and I assume it is a bug in GDAA. I contribute this to the fact that the DriveId used inside GDAA is 'invalid' until the folder gets committed and the ResourceId is resolved in underlying REST Api. Unfortunately, there is no completion event available for folder creation, so I resolved this by calling this sequence only once in onConnected() and caching the '2015-12's DriveId for later use as a parent of the image JPEG files.
Actually you can see it here (createTree() method) with text file on the tail, but the moment I switched the TEXT to JPEG, all hell broke lose.
Good Luck

Not fully listing Google Drive folders and files in Android app

I am trying to access all files and folders from google drive to a arraya list. But I can get only one file from Drive. What to do get all files and folders from google drive. I am using the following code..
Thanks
Arun
public void onConnected(Bundle connectionHint) {
// Log.i(TAG, "API client connected.");
Toast.makeText(getActivity(), "Successfully logged in", Toast.LENGTH_LONG).show();
DriveFolder s = Drive.DriveApi.getRootFolder(mGoogleApiClient);
String s1 = (Drive.DriveApi.getRootFolder(mGoogleApiClient)).getDriveId().toString();
DriveId sFolderId2 = DriveId.decodeFromString(s1);
DriveId sFolderId = (Drive.DriveApi.getRootFolder(mGoogleApiClient)).getDriveId();
DriveFolder folder = Drive.DriveApi.getFolder(mGoogleApiClient, sFolderId);
folder.listChildren(mGoogleApiClient).setResultCallback(rootFolderCallback);
// findAll(folder);
}
public ResultCallback<DriveApi.MetadataBufferResult> rootFolderCallback = new
ResultCallback<DriveApi.MetadataBufferResult>() {
#Override
public void onResult(DriveApi.MetadataBufferResult result) {
if (!result.getStatus().isSuccess()) {
return;
}
resultarray = new ArrayList<String>();
int hh = result.getMetadataBuffer().getCount();
for (int i = 0; i < result.getMetadataBuffer().getCount(); i++) {
resultarray.add(result.getMetadataBuffer().get(i).getTitle());
}
Toast.makeText(getActivity(), "Successfully listed files.", Toast.LENGTH_LONG).show();
}
};

UPDATE (Aug 25, 2015, 10:39 MST)
Based on your comment below, you have 2 options:
1/ Stay with the GDAA, use one of the INTENTS:
- Pick a file with opener activity
- Pick a folder with opener activity
See, GDAA does not let your app see anything it did not create (SCOPE_FILE only), but it still allows user to browse everything. If the user selects a file, it will become visible to you app. I don't know your app's intentions, so I can't say if this approach is usable.
2/ Switch to the REST with the DRIVE scope and your app will see everything (user has to approve up front). The basic CRUD implementation can be found here but make sure you change the scope in the init() method to 'DriveScopes.DRIVE'.
In case your app needs to iterate down the folder tree, collecting files in the process, both 'testTree()' and 'deleteTree()' methods in the MainActivity() do exactly that.
You may also stay with the GDAA and add REST functionality to it by adding
com.google.api.services.drive.Drive mGOOSvc = new Drive.Builder(AndroidHttp.newCompatibleTransport(), new GsonFactory(),
GoogleAccountCredential.usingOAuth2(appContext, Collections.singletonList(DriveScopes.DRIVE))
.setSelectedAccountName(email)
but you will sooner or later run into problems caused by GDAA caching / latency.
ORIGINAL ANSWER
Try this approach:
private static GoogleApiClient mGAC;
/****************************************************************************
* find file/folder in GOODrive
* #param prnId parent ID (optional), null searches full drive, "root" searches Drive root
* #param titl file/folder name (optional)
* #param mime file/folder mime type (optional)
* #return arraylist of found objects
*/
static void search(String prnId, String titl, String mime) {
if (mGAC != null && mGAC.isConnected()) {
// add query conditions, build query
ArrayList<Filter> fltrs = new ArrayList<>();
if (prnId != null){
fltrs.add(Filters.in(SearchableField.PARENTS,
prnId.equalsIgnoreCase("root") ?
Drive.DriveApi.getRootFolder(mGAC).getDriveId() : DriveId.decodeFromString(prnId)));
}
if (titl != null) fltrs.add(Filters.eq(SearchableField.TITLE, titl));
if (mime != null) fltrs.add(Filters.eq(SearchableField.MIME_TYPE, mime));
Query qry = new Query.Builder().addFilter(Filters.and(fltrs)).build();
// fire the query
Drive.DriveApi.query(mGAC, qry).setResultCallback(new ResultCallback<MetadataBufferResult>() {
#Override
public void onResult(MetadataBufferResult rslt) {
if (rslt != null && rslt.getStatus().isSuccess()) {
MetadataBuffer mdb = null;
try {
mdb = rslt.getMetadataBuffer();
if (mdb != null ) for (Metadata md : mdb) {
if (md == null || !md.isDataValid()) continue;
String title = md.getTitle();
DriveId driveId = md.getDriveId();
//.......
}
} finally { if (mdb != null) mdb.close(); }
}
}
});
}
}
Call it first with NULLs
search(null,null,null)
To list all the files in your Google Drive. You will see all the files your Android App created. But only those - FILE scope does not see anything else.
If you need to scan the directory tree, you may look closer at this GDAA demo, in MainActivity, there is are 'testTree()' / 'deleteTree() methods that recursively scan the directory tree structure.
Also, you may look at the answer here, it deals with a similar issue (especially the comments exchange under the answer).
Good Luck

Please note that you can use GDAA to retrieve the files and folder that you have either uploaded from the Android Device or downloaded via the drive app. This is to have more security (as quoted by Google).
In he code you need to ensure that you are trying all possible combinations for the files that may be present in your Google Drive account. For example, check if you are tracking the parent of a file or a folder. If this condition is not met your app wont be able to retrieve those specific files.
/** Get the list of parents Id in ascending order. */
private List<String> collectParents(String folderId, Map<String, String> folderIdToParentId){
String parentId = folderIdToParentId.get(folderId);
if (logger.isTraceEnabled()){
logger.trace("Direct parent of {} is {}", folderId, parentId);
}
List<String> ancestors = new ArrayList<String>();
ancestors.add(parentId);
if (folderIdToParentId.containsKey(parentId)){
ancestors.addAll(collectParents(parentId, folderIdToParentId));
return ancestors;
}
return ancestors;
}
See the full code here.

Android: Working with drive application folder

I'm building application using Google Drive api. But app folder not working after uninstalling the app. Here is what I been trying to do:
public searchFiles(){
GoogleApiClient googleApiClient = getGoogleApiClient();
Drive.DriveApi.getAppFolder(googleApiClient).listChildren(googleApiClient)
.setResultCallback(metadataBufferCallback);
}
private final ResultCallback<DriveApi.MetadataBufferResult> metadataBufferCallback = new
ResultCallback<DriveApi.MetadataBufferResult>() {
#Override
public void onResult(DriveApi.MetadataBufferResult result) {
if (!result.getStatus().isSuccess()) {
// Error
return;
}
MetadataBuffer metadataBuffer = result.getMetadataBuffer();
DriveId driveId = null;
if(metadataBuffer.getCount() > 0){
Metadata metadata = metadataBuffer.get(0);
driveId = metadata.getDriveId();
}
metadataBuffer.close();
if(driveId != null){
// success
}
else{
// omg, why?
}
}
};
I am not working with filters just yet, I got only got one file there. If I replace getAppFolder with getRootFolder it works just fine.
Also it works when it's cached, but once I uninstall the application metadataBuffer.getCount() is always return 0, even so in drive it says that I have 23 bytes of hidden data.
What am I missing here?
*I asked the user for SCOPE_APPFOLDER in the permissions. And I am running a signed version of the app.

Nullpointer in delete file from gdrive

First error come when I'm trying to get Resource id from Driveid.
DriveFile dfile= Drive.DriveApi.getFile(mGoogleApiClient,DriveId.decodeFromString(driveId));
Log.e(TAG,"Driveid>>>>" + driveId);
String resourceID= dfile.getDriveId().getResourceId().toString();
Whenever I got Resource id and trying to delete item from google drive.
com.google.api.services.drive.Drive service;
service.files().delete(resourceID).execute();
Here Logcat ERROR:
Please Give me standard Solution for delete file from google drive.

For newly created files, the resourceId will not be populated right away. It will be populated once the file is committed to the server. You should check if it is null before using it.

For 'trash', there is no need to mix the GDAA with the REST Api anymore. Since GooPlaySvcs release 7.0 (March 2015), there is a 'trash()' method in the GDAA that does not require the ResourceId, shielding you from the timing issues related to the the latency/existence of it.
For short demonstration, here is a 'trash' wrapper for the GDAA that does not need ResourceId. On top of it, you don't need to worry about the network (wifi) on-line / off-line state.
private static GoogleApiClient mGAC;
...
static void trash(DriveId dId) {
if (mGAC != null && mGAC.isConnected() && dId != null) {
DriveResource driveResource;
if (dId.getResourceType() == DriveId.RESOURCE_TYPE_FOLDER) {
driveResource = Drive.DriveApi.getFolder(mGAC, dId);
} else {
driveResource = Drive.DriveApi.getFile(mGAC, dId);
}
if (driveResource != null) {
driveResource.trash(mGAC).setResultCallback(new ResultCallback<Status>() {
#Override
public void onResult(Status status) {
// bingo, trashed successfully !!!
}
});
}
}
}
Good Luck

Google Drive Android API - Check if folder exists

I'm trying to figure out how to check if a folder exists in Google Drive using the new Google Drive Android API
I've tried the following, thinking that it would either crash or return null if the folder is not found, but it doesn't do that (just as long as it is a valid DriveId, even though the folder has been deleted).
DriveFolder folder = Drive.DriveApi.getFolder(getGoogleApiClient(), driveId));
If i try to create a file the folder I get from the above code, it does not crash either?
I'm clearly having a little hard time understanding how this new API works all to together, especially with the very limited tutorials and SO questions out there, and I'm really stuck on this one, so any input will be much appreciated.
Just to clarify my problem: I'm creating a file in a specified Google Drive folder, but if the folder does not exist (has been deleted by user), I want to create it first.

After a lot of research this is the code I ended up with. It works properly, but has an issue: When a folder is trashed in Google Drive it takes some time (hours) before the metadata I can fetch from my app is updated, meaning that this code can first detect if the folder has been trashed a couple of hours later the trashing event actually happened - further information and discussions can be found here.
public class checkFolderActivity extends BaseDemoActivity {
#Override
public void onConnected(Bundle connectionHint) {
super.onConnected(connectionHint);
DriveId folderId = DriveId.decodeFromString(folderId);
DriveFolder folder = Drive.DriveApi.getFolder(mGoogleApiClient, folderId);
folder.getMetadata(mGoogleApiClient).setResultCallback(metadataRetrievedCallback);
}
final private ResultCallback<DriveResource.MetadataResult> metadataRetrievedCallback = new
ResultCallback<DriveResource.MetadataResult>() {
#Override
public void onResult(DriveResource.MetadataResult result) {
if (!result.getStatus().isSuccess()) {
Log.v(TAG, "Problem while trying to fetch metadata.");
return;
}
Metadata metadata = result.getMetadata();
if(metadata.isTrashed()){
Log.v(TAG, "Folder is trashed");
}else{
Log.v(TAG, "Folder is not trashed");
}
}
};
}

If you're creating a folder based on it's existence status, the 'createTree()' method here does just that.
The following 2 code snippets list files/folders based on arguments passed ( inside a folder, globally, based on MIME type ...). The line with md.getTitle() is the one that you can use to interrogate files/folders.
GoogleApiClient _gac;
void findAll(String title, String mime, DriveFolder fldr) {
ArrayList<Filter> fltrs = new ArrayList<Filter>();
fltrs.add(Filters.eq(SearchableField.TRASHED, false));
if (title != null) fltrs.add(Filters.eq(SearchableField.TITLE, title));
if (mime != null) fltrs.add(Filters.eq(SearchableField.MIME_TYPE, mime));
Query qry = new Query.Builder().addFilter(Filters.and(fltrs)).build();
MetadataBufferResult rslt = (fldr == null) ? Drive.DriveApi.query(_gac, qry).await() :
fldr.queryChildren(_gac, qry).await();
if (rslt.getStatus().isSuccess()) {
MetadataBuffer mdb = null;
try {
mdb = rslt.getMetadataBuffer();
if (mdb == null) return null;
for (Metadata md : mdb) {
if ((md == null) || md.isTrashed()) continue;
--->>>> md.getTitle()
}
} finally { if (mdb != null) mdb.close(); }
}
}
void listAll(DriveFolder fldr) {
MetadataBufferResult rslt = fldr.listChildren(_gac).await();
if (rslt.getStatus().isSuccess()) {
MetadataBuffer mdb = null;
try {
mdb = rslt.getMetadataBuffer();
if (mdb == null) return null;
for (Metadata md : mdb) {
if ((md == null) || md.isTrashed()) continue;
--->>>> md.getTitle()
}
} finally { if (mdb != null) mdb.close(); }
}
}
The key is probably checking the "isTrashed()" status. Since 'remove' file on the web only moves it to TRASH. Also, deleting in general (on the website, since there is no 'DELETE' in the API) is a bit flaky. I was testing it for a while, and it may take hours, before the "isTrashed()" status is updated. And manually emptying the trash in Google Drive is also unreliable. See this issue on Github.
There is a bit more talk here, but probably unrelated to your problem.

So today the answer is out of date API.
So I have posted example of how to check the folder if exists with the new update of documentation:
fun checkFolder(name: String):Boolean {
check(googleDriveService != null) { "You have to init Google Drive Service first!" }
return search(name, FOLDER_MIME_TYPE)
}
private fun search(name: String, mimeType:String): Boolean {
var pageToken: String? = null
do {
val result: FileList =
googleDriveService!!
.files()
.list()
.setQ("mimeType='$FOLDER_MIME_TYPE'")
.setSpaces("drive")
.setFields("nextPageToken, files(id, name)")
.setPageToken(pageToken)
.execute()
for (file in result.files) {
Log.d(TAG_UPLOAD_FILE , "Found file: %s (%s)\n ${file.name}, ${file.id} ")
if (name == file.name) return true
}
pageToken = result.nextPageToken
} while (pageToken != null)
return false
}
private const val FOLDER_MIME_TYPE= "application/vnd.google-apps.folder"

You can try to get the metadata for the folder. If the folder doesn't exist, this will fail.