Fastest/shortest way to the root folders? - java

I'm using Google Drive SDK v2 on Android to get the list of root folders. Currently I see these required steps - which seem to load forever. Is there no faster way?
I tried to use the search with the q= parameter but I don't get it to work (FileList vs. Files.List) - different API levels?
FileList files = drive.files().list().setQ("'root' in parents and mimeType='application/vnd.google-apps.folder' and trashed=false");
This is what I do currently:
About about = drive.about().get().execute();
if (about != null) {
ChildList childList = drive.children().list(about.getRootFolderId()).execute();
if (childList != null) {
List<ChildReference> listChildReference = childList.getItems();
for (ChildReference childReference : listChildReference) {
File file = drive.files().get(childReference.getId()).execute();
if (file != null) {
String fileExtension = file.getFileExtension();
String mimeType = file.getMimeType();
if (mimeType != null
&& mimeType.equals("application/vnd.google-apps.folder")
&& (fileExtension == null || fileExtension.equals(""))) {
Log.d(this.getClass().getName(), file.getTitle());
}
}
}
}
}
What's the fastest for an Android app?
Thanks in advance.

My personal opinion is avoid the Drive SDK and call the REST API directly. It's a fairly simple API, and the way the documentation is structured, you are forced to understand it anyway in order to use the SDK. You have the benefit that if something doesn't work, you can directly compare your app with what's happening on the wire and resolve any problems.

Found it:
#Override
protected ArrayList<File> doInBackground(final Void... voids) {
ArrayList<File> result = new ArrayList<File>();
Files.List request = null;
boolean ok = true;
do {
try {
request = drive
.files()
.list()
.setMaxResults(200)
.setQ("'root' in parents and mimeType='application/vnd.google-apps.folder' and trashed=false");
FileList files = request.execute();
result.addAll(files.getItems());
request.setPageToken(files.getNextPageToken());
} catch (IOException exception) {
ok = false;
}
} while (ok && request.getPageToken() != null && request.getPageToken().length() > 0);
return result;
}

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Android Rename File using Google Drive REST API v3?

How do I rename a file using the Google Drive REST API on Android? I have searched the internet however I could, but I can't find how to do this.
I am trying to write a sync method that moves and renames the cloud files if it detects that the local copy has been moved or renamed:
void syncMetadataOnly (com.google.api.services.drive.model.File cloud,
java.io.File local) throws IOException {
Workspace.FINF fileInfo = Workspace.getFileInfo (this, local); // Just my metadata object.
Map<String, String> appProperties = cloud.getAppProperties ();
// We keep track of the last rename and move in our private app properties:
long cloudLastRename = appProperties.containsKey ("last-rename") ?
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long cloudLastMove = appProperties.containsKey ("last-move") ?
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boolean needMove = false;
if (fileInfo.lastRename > cloudLastRename) {
// The file was renamed locally since the last sync.
needName = true;
needUpdate = true;
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oldRecognizedParent = getFirstKnownParentId (cloud); // May be null, if not found.
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if (needName) update.set /// How do I rename the file?
if (needMove) {
if (oldRecognizedParent != null)
update.setRemoveParents (oldRecognizedParent);
update.setAddParents (fileInfo.driveParentId); // Set to the NEW parent's ID.
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com.google.api.services.drive.model.File result = update.execute ();
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The closest answer I have found is this, but do I really have to use raw HTTP for this?

Java Jackson DeserializationFeature

I have problem with Jackson and DeserializationFeature. From WebService I get JSON field like:
"location":null,
OR
"location":{
"code":"YYYYYY",
"label":"XXXXXX"
},
When I try get code or label eg.
project.getLocation().getCode();
Java return NullPointerException.
My current code is written like eg. and its work fine.
if (project.getLocation() != null) {
location_code = project.getLocation().getCode();
location_label = project.getLocation().getLabel();
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Which option of DeserializationFeature is right for this problem?
Not sure about DeserializationFuture option, but simple null check could do the job:
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I have this JavaJaxRs dictionary with my templates:
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if (null != modelPackage) {
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if (null != apiPackage) {
config.additionalProperties().put(API_PACKAGE_PARAM, apiPackage);
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config.additionalProperties().put(INVOKER_PACKAGE_PARAM, invokerPackage);
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Somehow i always get the code generated with the standard template file.
UPDATE:
When i remember correctly i had a conditional bug on:
if(null != templateDirectory)
config.additionalProperties().put(TEMPLATE_DIR_PARAM, templateDirectory);
or somewhere else but with the right condition, code was working as intended.
I let the question stay here, maybe it will help some other users.
You can get the help options for the code generator like such:
java -jar swagger-codegen-cli.jar help generate
Which should tell you that you can override the template location with the -t parameter:
java -java swagger-codegen-cli.jar generate -l {language} -t path/to/templates
Regarding the above ava -java swagger-codegen-cli.jar generate -l {language} -t path/to/templates,
I've managed to make it work with current being-worked-on-release (2.2.0).
With 2.1.6 (current GA) it does not work.
I have posted the following on swagger-codegen at GitHub:
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Did not get any attention though...

How to programatically clear application cache in Android 4.2.2 and above

In Android 4.0 I use this solution to clear my application cache and it works perfectly:
public void clearApplicationData()
{
File cache = getCacheDir();
File appDir = new File(cache.getParent());
if (appDir.exists()) {
String[] children = appDir.list();
for (String s : children) {
if (!s.equals("lib")) {
deleteDir(new File(appDir, s));
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}
}
}
public static boolean deleteDir(File dir)
{
if (dir != null && dir.isDirectory()) {
String[] children = dir.list();
for (int i = 0; i < children.length; i++) {
boolean success = deleteDir(new File(dir, children[i]));
if (!success) {
return false;
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return dir.delete();
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I don't get any errors in logcat. Device: Samsung Galaxy Tab 2 7.0'
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PackageManager pm = getPackageManager();
// Get all methods on the PackageManager
Method[] methods = pm.getClass().getDeclaredMethods();
for (Method m : methods) {
if (m.getName().equals("freeStorage")) {
try {
long desiredFreeStorage = 8 * 1024 * 1024 * 1024;
m.invoke(pm, desiredFreeStorage , null);
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// Method invocation failed. Could be a permission problem
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break;
}
}

Get list of packages in a java project

I m using the below code to get the list of packages in the give java project. But it is including the folders also in the list. Please suggest a way to ignore folders.
final IPackageFragmentRoot[] packageFragmentRootArray = workingJavaProject.getJavaProject().getAllPackageFragmentRoots();
for (final IPackageFragmentRoot packageFragmentRoot : pkgFrgmRoots) {
if (!packageFragmentRoot.isArchive()) {
for (final IJavaElement pkg : packageFragmentRoot.getChildren()) {
if (pkg != null && !isEmpty(pkg.getElementName()) && pkg instanceof IPackageFragment) {
allPackages.add((IPackageFragment) pkg);
}
}
}
}
IPackageFragment can be an instantiate of IFiles, IFolders, or IStorages. One possible solution:
if (pkg != null && !isEmpty(pkg.getElementName()) && pkg instanceof IPackageFragment) {
if (!(pkg instanceof IFolder)) {
allPackages.add((IPackageFragment) pkg);
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}

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