collections.md

Collections in the Microsoft Graph SDK for Android

The Microsoft Graph SDK for Android allows you to work with item collections in the Microsoft Graph service.

Collection information is contained within a BaseCollectionPage object, to which there are three core aspects:

• getCurrentPage The list of items within the current page.
• getNextPage The next page request builder. null if there are no additional pages.
• getRawObject The json that represents this page response, containing additional data.

Getting a children collection by expansion

There are several navigation properties within the Microsoft Graph service which can be expanded and returned in collections pages. In order to access these properties, the service request needs to call expand(...) once the request is issued.

Parameters

Name	Description
itemId	The item id of the item that has the children.
propertyToExpand	The name of the navigation property to expand.
callback	The callback when the get call is returned.

final String itemId = "0000000000000000000000";
final String propertyToExpand = "children";
final ICallback<DriveItem> callback = new ICallback<DriveItem> {
    @Override
    public void success(final DriveItem result) {
        final IDriveItemCollectionPage page = result.children;
        Toast.makeText(getActivity(), "Got children", Toast.LENGTH_LONG).show();
    }
    ...
    // Handle failure
}

graphServiceClient
    .getMe()
    .getDrive()
    .getItems(itemId)
    .buildRequest()
    .expand(propertyToExpand)
    .get(callback);

Getting a children collection by request

You can reference navigation properties directly by using the getChildren() function within the item's request builder.

Parameters

Name	Description
itemId	The item id of the item that has the children.
callback	The callback when the get call is returned.

final String itemId = "0000000000000000000000";
final ICallback<IDriveItemCollectionPage> callback = new ICallback<IDriveItemCollectionPage>() {
    @Override
    public void success(final IDriveItemCollectionPage result) {
        Toast.makeText(getActivity(), "Got children", Toast.LENGTH_LONG).show();
    }
    ...
    // Handle failure
}

graphServiceClient
    .getMe()
    .getDrive()
    .getItems(itemId)
    .getChildren()
    .buildRequest()
    .get(callback);

Getting the next page

When getting a collection response, the getNextPage() function will return the null if there are no more pages, or the request builder to get the next page. By using these request builders you can retrieve all of the items under a collection no matter the size.

Name	Description
itemId	The item id of the item that has the children
callback	The callback when the get call is returned

final String itemId = "0000000000000000000000";
final ICallback<IDriveItemCollectionPage> callback = new ICallback<IDriveItemCollectionPage>() {
    @Override
    public void success(final IDriveItemCollectionPage result) {
        // If there was more pages retrieve them too
        if (result.getNextPage() != null) {
            result.getNextPage()
                    .buildRequest()
                    .get(new ICallback<IDriveItemCollectionPage>() {...});
        }
        Toast.makeText(getActivity(), "Got children", Toast.LENGTH_LONG).show();
    }
    ...
    // Handle failure
}

graphServiceClient
    .getMe()
    .getDrive()
    .getItems(itemId)
    .getChildren()
    .buildRequest()
    .get(callback);

Create a folder

You can create a folder within an item collection by using the request builders getDrive, getItems, and getChildren with the create method.

Parameters

Name	Description
folderToCreate	The folder to create.
parentId	The item id for the parent item.
callback	The callback when the folder has been created.

final String parentId = "0000000000000000000000";
final DriveItem folderToCreate = new DriveItem();
folderToCreate.name = "NewFolder";
folderToCreate.folder = new Folder();

final ICallback<DriveItem> callback = new ICallback<DriveItem>() {
    @Override
    public void success(final DriveItem result) {
        Toast.makeText(getActivity(), "Created Folder", Toast.LENGTH_LONG).show();
    }
    ...
    // Handle failure
}

graphServiceClient
    .getMe()
    .getDrive()
    .getItems(parentId)
    .getChildren()
    .buildRequest()
    .create(newItem, callback);