I implemented the uploading function the file to Cloudinary.
Cloudinary cloudinary = new Cloudinary(Constants.CLOUDINARY_URL);
try {
FileInputStream is = new FileInputStream(new File(filePath));
Uploader uploader = cloudinary.uploader();
Map map = uploader.upload(is, new HashMap());
return map;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Now I would like to show the uploading percent in progress bar while upload.
But I can't find any callback function to get uploading percent.
Please help me.
Thanks.
cprakashagr answer actually works wonders. Just to elaborate on his answer, you will need to download the latest cloudinary library off github by doing this:
git clone https://github.com/cloudinary/cloudinary_java.git
Then you will have to make the changes according to his link:
https://github.com/cloudinary/cloudinary_java/pull/41
You cannot use Android Studio to make these changes as this is a maven project so you will need to use another IDE, like IntelliJ for example.
This is how I made the changes:
You will need to add on the class: UploadCallback
You will need to replace the class Uploader with his class: https://github.com/cprakashagr/cloudinary_java/blob/master/cloudinary-core/src/main/java/com/cloudinary/Uploader.java
Once you have done this, go into the main folder of your cloudinary_java, and then enter into Terminal. Go and type in mvn install and press enter. You will see that mvn will build the jars for the different folders in your directory. After the build is complete, if you navigate into the cloudinary-core folder for example, you will see the cloudinary-core jar.
You must copy the cloudinary-core jar from the folder and add it into your android project "libs" folder in the root of your android project. Once you have done that and it appears there, right click on the jar in Android Studios and click "Add as Library" so that android studios will add it as a dependency.
The cloudinary-android jar does not need to be added as a jar as you can grab a copy off gradle. Your final gradle file should look something like this:
compile('com.cloudinary:cloudinary-android:1.2.2') {
exclude module: 'cloudinary-core'
}
compile files('/Users/XXX/Documents/myApp/libs/cloudinary-core-1.4.2-SNAPSHOT.jar')
Rebuild your android studio project and you will see that the UploadCallback is now an object you can use in your android project. This is the way you know your jar build was successfully modified.
Now inside a service class, add your code for cloudinary direct upload. You will need to put the code inside a service class because you cannot do network operations on a UI thread and you will get an error if you tried:
Map config = new HashMap();
config.put("cloud_name", "XXX");
Cloudinary mobileCloudinary = new Cloudinary(config);
Map map = null;
try {
map = mobileCloudinary.uploader()
.uploadLarge(this,
intent.getSerializableExtra(getString(R.string.file)),
ObjectUtils.asMap("public_id", 123),
"tags", "myphoto",
"folder", "mylibrary",
"unsigned", true,
"upload_preset", "XXX"),
51200);
} catch (IOException e) {
e.printStackTrace();
}
String imageUrl = map.get("url").toString();
Timber.e("imageUrl " + imageUrl);
You must set the buffer to be large enough (but not too large) to make sure your callback is actually called. When I first tried this code out, I set the buffer to something really large, like 200000000, and the callback was not called because the upload would have happened all in one go. If you set it to a small value, like 2048, the callback will be called regularly however, the upload will become really slow. It is up to you to determine an adequate size which will work well for your app. For me it was 51200 which means for every 50kb of the file which is uploaded, a callback will occur.
Once it is working, you will need to transmit the progress information from the service class back to your activity class so you can display the progress on screen. I use a messageHandler to do so. This is the message method in my service class:
public void sendMessage(float progress) {
Message message = Message.obtain();
message.arg1 = Math.round(progress);
try {
messageHandler.send(message);
} catch (RemoteException e) {
e.printStackTrace();
}
}
This is my messageHandler on my activity class:
public class MessageHandler extends Handler {
#Override
public void handleMessage(final Message message) {
Timber.e("transfer: " + message.arg1);
}
}
The callback is not implemented from the cloudinary team yet. Though there have been few works around.
Check this link.
You need to import or build new JARs from the cloudinary source. For that, either you use this repository or make required changes to their original repository.
Let me know if you have some questions.
EDIT: On how to use it
Import these two cloudinary sources in your Android project (src/java dir):
Cloudinary Core Lib Source
Cloudinary Android Lib Source
Do changes as per my pull request.
And call the method uploadLarge as per the changed signature. Like:
cloudinary.uploader().uploadLarge(UploadCallback : uploadCallback, File : file, Map : options, int : bufferSize);
For buffer size, please assure you use at least 5242881. This is the limitation from cloudinary server. The minimum packet needs to be 5.001 MB at least.
Related
I try to copy one file from one folder to other folder inside the same bucket. For copying the file i use CopyObjectRequest class. But i do not know how can i get the progress of copy operation?
So please help me in it , how can i get the progress status of copy operation.
For copy operation i followed this way-
try {
AmazonS3 s3Client =new AmazonS3Client(credentials,cc);
// Copy the object into a new object in the same bucket.
CopyObjectRequest copyObjRequest = new CopyObjectRequest(bucketName, sourceKey, "wedorias-new", "test/test111/logo.png"/*destinationKey*/);
s3Client.copyObject(copyObjRequest);
if (copyObjRequest.isRequesterPays()){
System.out.println("sadfbgnh==");
}
} catch (AmazonServiceException e) {
// The call was transmitted successfully, but Amazon S3 couldn't process
// it, so it returned an error response.
e.printStackTrace();
System.out.println("exception==!"+e.getErrorMessage());
System.out.println("exception==!"+e.getErrorCode());
System.out.println("exception==!"+e.getMessage());
} catch (Exception e) {
e.printStackTrace();
System.out.println("exception==!"+e.getMessage());
}
If you want to copy one object from one folder to another one (Or other Buckets if it's the case) and check the progress, you will have to use Amazon S3 Multipart Upload.
AWS docs have a nice example called Copy an Object Using the AWS SDK for Java Multipart Upload API, it shows you what you have to do to set it up and check the progress of the copy.
// Get the object size to track the end of the copy operation.
GetObjectMetadataRequest metadataRequest = new GetObjectMetadataRequest(sourceBucketName, sourceObjectKey);
ObjectMetadata metadataResult = s3Client.getObjectMetadata(metadataRequest);
long objectSize = metadataResult.getContentLength();
Notice
Multipart upload is a must when the object is greater than 5GB.
Multipart upload is recommended when the object is greater than 100MB.
Multipart upload doesn't work if the object is less than 5MB.
I want to use a library in my android app but want this library to be optional to the users.
To make it optional, I want to distribute the library separate from the apk. So that:
Users who intend to use this option can
download the lib from within the app
And those who don't wish to use this get a smaller apk file.
I want to ask, Is it possible to distribute a library separately from the apk?.
I've seen some games downloading files after their installation. So, I feel this might be achievable but don't know how to achieve this.
Note: Please keep in mind the following:
The classes or methods would only be used in case the library has been downloaded by the user and would not be used in the other case.
Do not confuse distribution of library with distribution of resources. So please keep in mind that I want to separately distribute a library and not resources.
I don't think you can use a library as expansion file because if you use any class, methods of library in your project you have to import them, and you can not import them without using library in project, But I am not sure.
Please see below link for more detail.
https://developer.android.com/google/play/expansion-files.html
You can distribute your base functionality with your APK
If the user chooses to, your application can download additional files, including libraries. If they are not expansion files (OBB), then you should take care hosting them.
These additional libraries will have to be loaded in a similar manner:
for (File pluginFile : pluginFiles)
{
try
{
JarFile jarFile = new JarFile(pluginFile);
Enumeration<? extends JarEntry> entries = jarFile.entries();
while (entries.hasMoreElements())
{
JarEntry entry = entries.nextElement();
if (entry.getName().endsWith(".class"))
{
URLClassLoader loader = URLClassLoader.newInstance(new URL[]{pluginFile.toURI().toURL()});
System.out.println(entry.getName());
Class<?> entryClass = loader.loadClass(entry.getName().replace(".class", "").replace("/", "."));
if (isPlugin(entryClass))
{
IPlugin plugin = (IPlugin)entryClass.newInstance();
plugins.add(plugin);
System.out.println("Added plugin \'" + plugin.getPluginId() + "\' from \'" + pluginFile.getName() + "\'");
}
}
}
}
catch (InstantiationException | ClassNotFoundException | IOException | IllegalAccessException e)
{
e.printStackTrace();
}
}
This assumes you want to load JAR files.
Just got a Project Tango Development Kit tablet and have worked through some of the demos and examples.
Some older blog posts use the log files from a "Tango Mapper" application that should be preloaded on the device.
Interactive Visualization of Google Project Tango Data with ParaView
Ologic Announces integration between ROS and Project Tango
Google Tango and ROS integration at Bosch
Mapping Hints and Tips
Unfortunately, the "Tango Mapper" application did not come preloaded on my device and I can't seem to find it on the Play Store.
Is there some other method to simply export or retrieve the PointCloud data for downstream rendering?
[Model number: yellowstone, Tango Core Version: 1.1:2014.11.14-bernoulli-release]
Not sure if you ever got to solve this, but I was able to find the APK along with a method to export using Tango updated tablet version. I successfully exported the point cloud data using the method described in this blog.
http://www.kitware.com/blog/home/post/838
Edit
Procedure download the APK or use the source code found found in the GITHUB project folder.
Once that is done boot up the app as you normally would. There will a slider record, and auto. If you slide record it will only wait until you hit the snap shot button to record the point cloud data you are currently viewing.
If you slide the auto it will continuously record the point cloud data and create files as it tracks where you are moving. Keep in mind the larger the file the larger it takes to save as a zip.
Once done slide the record and it will prompt you to save and send.
I find it easier to save to the Google Drive as other the other methods sometimes fail to send.
Once done download the free Paraview App found http://www.paraview.org/download/ load up your Point cloud data.
It should be two files one your pose data and the other point cloud. (you could individually load each data using the collapse arrow you see before importing it in.)
That will be it you will be able to see your data and actually play back the animation of you recording it because of your pose data collected.
( only wrote this out because you were looking for an easier way to export data) This is probably the easiest. You could take said data and begin to reconstructed the room based on the pose data collected.)
all credit for source code and tutorial goes to the The Kitware blog
If links are broken DM me and I will send the file to you.
APK is found here
APK DOWNLOAD
they also have listed their source code at the bottom of the blog. It is based on the tango Explorer found in the app store.
Tango Mapper is an internal tool, and it's currently not public to developers. I think the best way to log the point cloud data is using the c or java example code provided, and maybe do some small modification to log the data to a file.
c example: https://github.com/googlesamples/tango-examples-c
java example: https://github.com/googlesamples/tango-examples-java
Sparse mapping: https://www.youtube.com/watch?v=x5C_HNnW_3Q
More indoor mapping: https://www.youtube.com/watch?v=3BNOsxMZD14
It appears that more than a few of the contributors to the Tango project were hired or bought by google. As an example most of the links to code and/or articles by Hidof are MIA, only a facebook page with few clues remains. The internet archive's wayback machine has a few snapshots of their website for the curious.
Go take a look at the Java Point Cloud sample on GitHub - The function you want to look at is onXyzIsAvailable in PointCloudActivity. Extracting a few relevant lines....
public void onXyzIjAvailable(final TangoXyzIjData xyzIj) {
....
byte[] buffer = new byte[xyzIj.xyzCount * 3 * 4];
FileInputStream fileStream = new FileInputStream(
xyzIj.xyzParcelFileDescriptor.getFileDescriptor());
try {
fileStream.read(buffer,
xyzIj.xyzParcelFileDescriptorOffset, buffer.length);
fileStream.close();
} catch (IOException e) {
e.printStackTrace();
}
At this point buffer contains the point cloud data - I would strongly recommend you ship this off the device via a binary service call, as I think making the poor thing try and convert it to JSON or XML would make things slower than you would like
Thank you Mark for your advice. I am a novice programmer and it is my first time working with java...
I am interested in exporting the Tango acquired PointCloud data to a file and I would like to ask for your feedback on my approach (I created a Save button, and onClick the data would be saved to a file on an external drive). Please find the code bellow for the part that should save the xyzIj data:
#Override
public void onClick(View v) {
switch (v.getId()) {
...
case R.id.save_button:
savePointCloud();
break;
default:
Log.w(TAG, "Unrecognized button click.");
}
}
private static void savePointCloud(final TangoXyzIjData xyzIj, String file) {
File directoryName = getAlbumStorageDir(file);
FileOutputStream out = new FileOutputStream(directoryName,"text.txt");
byte[] buffer = new byte[xyzIj.xyzCount * 3 * 4];
FileInputStream fileStream = new FileInputStream(
xyzIj.xyzParcelFileDescriptor.getFileDescriptor());
int read;
while ((read=fileStream.read(buffer))!=1){
try{
out.write(buffer, 0, read);
out.close();
System.out.println("Printed to file");
}catch(IOException e){e.printStackTrace();}
}
}
public File getAlbumStorageDir(String dirName) {
if (!isExternalStorageWritable()) {
return null;
} else {
// Get the directory for the user's public downloads directory.
File file = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_DOWNLOADS), dirName);
if (!file.mkdirs() || !file.exists()) {
Log.e(TAG, "Directory not created");
return null;
}
return file;
}
}
public boolean isExternalStorageWritable() {
String state = Environment.getExternalStorageState();
if ((Environment.MEDIA_MOUNTED.equals(state)
&& Environment.MEDIA_MOUNTED_READ_ONLY.equals(state))) {
return true;
} else {
Log.e(TAG, "External storage is not mounted READ/WRITE.");
return false;
}
}
I am working on integrating Apache FTP server to my Android app.
Follow the instructions here ( Embedding FtpServer in 5 minutes): http://mina.apache.org/ftpserver-project/embedding_ftpserver.html.
However, with all the codes included and the jar files imported to my android project, I got two major errors:
1. App crash upon ftp server start claiming class not found
2. Dalvik error 1
Tried every method by researching all related problems and the solution is to keep the minimal subset of the jar files that are listed in the (Embedding FtpServer in 5 minutes) instruction and make the code compile. Since there are not many jar files so I just did some try and error to get my minimal subset.
After that I use some new code to start the ftp server(here is the link): writing a java ftp server
However I couldn't connect because it says missing user.properties file. I download ftpserver-1.0.6-src source code and put the user.properties file into my android sdcard to make the ftp start. I put the user.properties file in the assets folder first, then copy it to the sdcard by using some code.
Now everything seems to work. However, I am not able to use anonymous login as my user name and password is set using:
BaseUser user = new BaseUser();
user.setName("test");
user.setPassword("test");
If I don't set it, the code won't compile.
Log in as anonymous user is the last part I have to do.
Another trivial thing is when I ftp to my android server, it won't allow me to download the files as it returns no permission error.
Any suggestions are welcome. Thank you
I've have had the same problem, so I've created my custom new users.properties file.
Here it is the code:
File files=new File(filepath + "/users.properties");
if (!files.exists()) {
try {
files.createNewFile();
} catch (IOException e) {
Log.e(TAG, "Errore nella creazione del file di log", e);
e.printStackTrace();
}
}
userManagerFactory.setFile(files);
userManagerFactory.setPasswordEncryptor(new SaltedPasswordEncryptor());
UserManager um = userManagerFactory.createUserManager();
BaseUser user = new BaseUser();
user.setName("xxx");
user.setPassword("yyy");
user.setHomeDirectory("/mnt/sdcard");
List<Authority> auths = new ArrayList<Authority>();
Authority auth = new WritePermission();
auths.add(auth);
user.setAuthorities(auths);
try {
um.save(user);
} catch (FtpException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
I've spent the last six hours pouring over documents from Google and I still don't know how to get started with this. All I want to do is make it so my existing Android app can read files from Google Drive, upload new files to Google Drive, and edit existing files on Google Drive.
I've read that Drive SDK v2 was focused solely on making it easy for Android (and mobile in general) developers to use it, and yet there seems to be virtually nothing in their documentation about it.
Ideally, I'd like someone to point at some decent documentation, example, or tutorial covering how to do this (keep in mind I'm using Android. They have plenty of stuff on how to use Drive with the Google App Engine; I have already looked at it and I have no idea how to go from that to an Android app.)
I need to know which libraries I need to download and add to my project, what I need to add to my manifest, and how I can ultimately get a list of files from Google Drive, download one, and then upload a modified version.
Ideally, I'd like it to handle accounts automatically, the way that the officially Google Drive app does.
Edit: Claudio Cherubino says that Google Play Services is now available and will make this process a lot easier. However, there's no sample code available (yet, he says it's coming soon... they said Google Play Services was "coming soon" 4 months ago, so there's a good chance this answer will continue to be the only completely working example of accessing Google Drive from your Android application into 2013.)
Edit 2X: Looks like I was off by about a month when I said Google wouldn't have a working example until next year. The official guide from Google is over here:
https://developers.google.com/drive/quickstart-android
I haven't tested their methods yet, so it's possible that my solutions from September 2012 (below) are still the best:
Google Play Services is NOT REQUIRED for this. It's a pain in the butt, and I spent well over 50 hours (edit: 100+ hours) figuring it all out, but here's a lot of things that it'll help to know:
THE LIBRARIES
For Google's online services in general you'll need these libraries in your project: (Instructions and Download Link)
google-api-client-1.11.0-beta.jar
google-api-client-android-1.11.0-beta.jar
google-http-client-1.11.0-beta.jar
google-http-client-android-1.11.0-beta.jar
google-http-client-jackson-1.11.0-beta.jar
google-oauth-client-1.11.0-beta.jar
guava-11.0.1.jar
jackson-core-asl-1.9.9.jar
jsr305-1.3.9.jar
For Google Drive in particular you'll also need this:
google-api-services-drive-v2-rev9-1.8.0-beta.jar (Download Link)
SETTING UP THE CONSOLE
Next, go to Google Console. Make a new project. Under Services, you'll need to turn on two things: DRIVE API and DRIVE SDK! They are separate, one does not automatically turn the other on, and YOU MUST TURN BOTH ON! (Figuring this out wasted at least 20 hours of my time alone.)
Still on the console, go to API Access. Create a client, make it an Android app. Give it your bundle ID. I don't think the fingerprints thing is actually important, as I'm pretty sure I used the wrong one, but try to get that right anyways (Google provides instructions for it.)
It'll generate a Client ID. You're going to need that. Hold onto it.
Edit: I've been told that I'm mistaken and that you only need to turn on Drive API, Drive SDK doesn't need to be turned on at all, and that you just need to use the Simple API Key, not set up something for Android. I'm looking into that right now and will probably edit this answer in a few minutes if i figure it out...
THE ANDROID CODE - Set Up and Uploading
First, get an auth token:
AccountManager am = AccountManager.get(activity);
am.getAuthToken(am.getAccounts())[0],
"oauth2:" + DriveScopes.DRIVE,
new Bundle(),
true,
new OnTokenAcquired(),
null);
Next, OnTokenAcquired() needs to be set up something like this:
private class OnTokenAcquired implements AccountManagerCallback<Bundle> {
#Override
public void run(AccountManagerFuture<Bundle> result) {
try {
final String token = result.getResult().getString(AccountManager.KEY_AUTHTOKEN);
HttpTransport httpTransport = new NetHttpTransport();
JacksonFactory jsonFactory = new JacksonFactory();
Drive.Builder b = new Drive.Builder(httpTransport, jsonFactory, null);
b.setJsonHttpRequestInitializer(new JsonHttpRequestInitializer() {
#Override
public void initialize(JSonHttpRequest request) throws IOException {
DriveRequest driveRequest = (DriveRequest) request;
driveRequest.setPrettyPrint(true);
driveRequest.setKey(CLIENT ID YOU GOT WHEN SETTING UP THE CONSOLE BEFORE YOU STARTED CODING)
driveRequest.setOauthToken(token);
}
});
final Drive drive = b.build();
final com.google.api.services.drive.model.File body = new com.google.api.services.drive.model.File();
body.setTitle("My Test File");
body.setDescription("A Test File");
body.setMimeType("text/plain");
final FileContent mediaContent = new FileContent("text/plain", an ordinary java.io.File you'd like to upload. Make it using a FileWriter or something, that's really outside the scope of this answer.)
new Thread(new Runnable() {
public void run() {
try {
com.google.api.services.drive.model.File file = drive.files().insert(body, mediaContent).execute();
alreadyTriedAgain = false; // Global boolean to make sure you don't repeatedly try too many times when the server is down or your code is faulty... they'll block requests until the next day if you make 10 bad requests, I found.
} catch (IOException e) {
if (!alreadyTriedAgain) {
alreadyTriedAgain = true;
AccountManager am = AccountManager.get(activity);
am.invalidateAuthToken(am.getAccounts()[0].type, null); // Requires the permissions MANAGE_ACCOUNTS & USE_CREDENTIALS in the Manifest
am.getAuthToken (same as before...)
} else {
// Give up. Crash or log an error or whatever you want.
}
}
}
}).start();
Intent launch = (Intent)result.getResult().get(AccountManager.KEY_INTENT);
if (launch != null) {
startActivityForResult(launch, 3025);
return; // Not sure why... I wrote it here for some reason. Might not actually be necessary.
}
} catch (OperationCanceledException e) {
// Handle it...
} catch (AuthenticatorException e) {
// Handle it...
} catch (IOException e) {
// Handle it...
}
}
}
THE ANDROID CODE - Downloading
private java.io.File downloadGFileToJFolder(Drive drive, String token, File gFile, java.io.File jFolder) throws IOException {
if (gFile.getDownloadUrl() != null && gFile.getDownloadUrl().length() > 0 ) {
if (jFolder == null) {
jFolder = Environment.getExternalStorageDirectory();
jFolder.mkdirs();
}
try {
HttpClient client = new DefaultHttpClient();
HttpGet get = new HttpGet(gFile.getDownloadUrl());
get.setHeader("Authorization", "Bearer " + token);
HttpResponse response = client.execute(get);
InputStream inputStream = response.getEntity().getContent();
jFolder.mkdirs();
java.io.File jFile = new java.io.File(jFolder.getAbsolutePath() + "/" + getGFileName(gFile)); // getGFileName() is my own method... it just grabs originalFilename if it exists or title if it doesn't.
FileOutputStream fileStream = new FileOutputStream(jFile);
byte buffer[] = new byte[1024];
int length;
while ((length=inputStream.read(buffer))>0) {
fileStream.write(buffer, 0, length);
}
fileStream.close();
inputStream.close();
return jFile;
} catch (IOException e) {
// Handle IOExceptions here...
return null;
}
} else {
// Handle the case where the file on Google Drive has no length here.
return null;
}
}
One last thing... if that intent gets sent off, you'll need to handle when it returns with a result.
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 3025) {
switch (resultCode) {
case RESULT_OK:
AccountManager am = AccountManager.get(activity);
am.getAuthToken(Same as the other two times... it should work this time though, because now the user is actually logged in.)
break;
case RESULT_CANCELED:
// This probably means the user refused to log in. Explain to them why they need to log in.
break;
default:
// This isn't expected... maybe just log whatever code was returned.
break;
}
} else {
// Your application has other intents that it fires off besides the one for Drive's log in if it ever reaches this spot. Handle it here however you'd like.
}
}
THE ANDROID CODE - Updating
Two quick notes on updating the last modified date of a file on Google Drive:
You must provide a fully initialized DateTime. If you do not, you'll get a response of "Bad Request" from Google Drive.
You must use both setModifiedDate() on the File from Google Drive and setSetModifiedDate(true) on the update request itself. (Fun name, huh? "setSet[...]", there's no way people could mistype that one...)
Here's some brief sample code showing how to do an update, including updating the file time:
public void updateGFileFromJFile(Drive drive, File gFile, java.io.File jFile) throws IOException {
FileContent gContent = new FileContent("text/csv", jFile);
gFile.setModifiedDate(new DateTime(false, jFile.lastModified(), 0));
gFile = drive.files().update(gFile.getId(), gFile, gContent).setSetModifiedDate(true).execute();
}
THE MANIFEST
You'll need the following permissions: GET_ACCOUNTS, USE_CREDENTIALS, MANAGE_ACCOUNTS, INTERNET, and there's a good chance you'll need WRITE_EXTERNAL_STORAGE as well, depending on where you'd like to store the local copies of your files.
YOUR BUILD TARGET
Right click your project, go into it's properties, and under Android change the build target to Google APIs if you must. If they aren't there, download them from the android download manager.
If you're testing on an emulator, make sure its target is Google APIs, not generic Android.
You'll need a Google Account set up on your test device. The code as written will automatically use the first Google Account it finds (that's what the [0] is.) IDK if you need to have downloaded the Google Drive app for this to have worked. I was using API Level 15, I don't know how far back this code will work.
THE REST
The above should get you started and hopefully you can figure your way out from there... honestly, this is just about as far as I've gotten so far. I hope this helps A LOT of people and saves them A LOT of time. I'm fairly certain I've just written the most comprehensive set up guide to setting up an Android app to use Google Drive. Shame on Google for spreading the necessary material across at least 6 different pages that don't link to each other at all.
It's 2015, things have changed!
Get the 'Drive API for Android' with gradle:
compile 'com.google.android.gms:play-services-drive:7.8.0'
There's some new doco (although still lackluster IMO):
https://developers.google.com/drive/web/quickstart/android
And for those about to go caving...the biggest problem I encountered thus far is that there is absolutely no way of distinguishing folders that have been permanently deleted from folders that are normal...you can find them, you can create folders and files within them, only writing to the file DriveContents will always fail.
Check this video from Google I/O to learn how to integrate your Android app with Drive:
http://www.youtube.com/watch?v=xRGyzqD-vRg
Please be aware that what you see in the video is based on Google Play Services:
https://developers.google.com/android/google-play-services/
Take a look at Google's DrEdit Example, which has a folder called android/. Copy it, follow the readme, and it should work (works for me on an Android emulator with KitKat).
.
P.S.
Sorry for reviving this, but the new Google Drive Android API doesn't support full Drive access, only drive.file and drive.appdata authorization scopes, so if you need full access you have to go back to the good 'ol Google API's Client for Java (which the DrEdit example uses).