Maintaining a healthy and trustworthy ecosystem is in every Android developer’s best interest.

Here are a few tips for writing trustworthy Android applications:

1. Maintain a privacy policy
2. Minimize permissions
3. Give your users a choice regarding data collection
4. Don’t collect unnecessary information
5. Don’t send data off the device
6. … but if you have to, use encryption and data minimization
7. Don’t use code you don’t understand
8. Don’t log device or user specific information.

Maintain a privacy policy

Trustworthy applications are up-front about the data they collect and the reasons for collecting it. Users are generally happy to share information via such apps if they believe they will personally benefit. A clear and concise privacy policy, with details about the type of information collected and how it’s used, goes a long way towards generating trust and good will.

Minimize permissions

Android is unique among mobile operating systems for its simple, straightforward, operating-system-enforced permission model. All Android applications must declare the permissions they require, and users must approve these permissions before the application is installed. Users tend to distrust applications that require excessive permissions.

For example, a user installing this tic-tac-toe game might reasonably wonder why it needs to take pictures.

Give your users a choice regarding data collection

It’s called the paradox of privacy [PDF, 890K]. Users are often happy to share their information, but they want control over that sharing. Trustworthy applications give users control over their information. For example, the Android Browser has privacy settings which enable users to control how their information is shared.

Don’t collect unnecessary information

Trustworthy applications limit the kinds of data they collect. Collecting unnecessary information, especially if you never use it, just invites suspicion. When in doubt, don’t collect it.

Don’t send data off the device

If you have to handle user data, ensure that the data remains on the device whenever possible. Users are comforted knowing that their private information strictly resides in the phone. Sending data outside the phone, even if done for the user’s benefit, tends to draw suspicion.

… but if you have to, use encryption and data minimization

Sometimes, the collection of data is necessary. In that case, applications need to ensure that it is handled safely. A privacy policy will avoid leading to surprised and irritated users; in some cases, it may be advisable to prompt the user before transmitting data off-device.

First, minimize the amount of data you collect. Do you really need the user’s full phone number, or would the area code be sufficient? Can you use a one-way cryptographic hash function on the data before sending it to the server to help protect the user’s confidential information?

A case study: User Favorites

Suppose you want your app to maintain a list of “favorites” for each of your users, without going through a full registration process. In theory, you could do this by sending your server some combination of their phone number, device ID, or SIM ID. But why take the chance of worrying people about privacy issues; why not send a one-way hashed signature of whatever the identifying information is? Or even better, create a random unique id and store it on the phone, and use this unique id as the registration key for your application.

In the end, you’ll will still be able to retrieve their favorites, but you won’t need to send or store anything sensitive.

Second, encryption is critical to the safe handling of user data. Phones often operate on untrusted networks where attackers can sniff confidential traffic. Encrypting data in transit is a critical part of protecting user information.

Finally, when communicating with a server over HTTP, it’s a good idea to avoid encoding user information in a URL that is used with HTTP GET; rather, POST it in a message body. While using POST doesn’t guarantee that your information won’t be sniffed, putting it in the URL increases the likelihood that it will be automatically logged; out of the box, most web server software logs all the URLs that are received.

Don’t use code you don’t understand

In the open-source Android environment, it’s common (and good) practice to rely heavily on other people’s code, in the form of libraries and frameworks. But if that code is handling your users’ information inappropriately, it’s your problem. So make a point of checking code before you rely on it.

Don’t log user or device specific information

Application developers should be careful about on-device logs. Android makes it easy to write to the phone’s log, and anyone who has looked at “logcat” output knows that it is full of important but seemingly random debugging information from many applications. In Android, logs are a shared resource, and are available to an application with the READ_LOGS permission (only with user consent, of course!). Even though the phone log data is temporary and erased on reboot, inappropriate logging of user information could inadvertently leak user data to other applications.

From: Android Developer Blog

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According to Times Online, Google is developing a speech-to-speech automated translator for Android phones. It’s essentially a combination of two of Google’s existing technologies; its online universal translator service, Google Translate, and its voice recognition system.

Google plans to make its Babel Fish a lot like a human translator; the software would analyze chunks of speech, and translate them in their entirety rather than translating word for word. Franz Och, Google’s head of translation services, claims the technology could go live in a couple of years. “Clearly, for it to work smoothly, you need a combination of high-accuracy machine translation and high-accuracy voice recognition, and that’s what we’re working on. If you look at the progress in machine translation and corresponding advances in voice recognition, there has been huge progress recently,” he says.

Anyone who’s used Google Translate knows that translations aren’t (and probably never will be) perfect, but they’re very helpful when you can’t understand a word of some foreign language. However, Google’s voice recognition also has issues of its own, and I fear that these two combined would produce a very high amount of errors. The Times also mentions the issue of different accents, a problem that Google plans to solve by making the software gradually learn the speaking habits of the phone’s owner.

Despite the big issues Google has to overcome to make this technology useful, if anyone can pull it off, Google can. The idea of being able to call someone who doesn’t speak your language, and have the conversation translated almost instantly, well, that’s one of those inventions that made Google the company it is today.

Thanks to: Mashable

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thanks to: Mashable

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• Quick contact badge: Press the contact status icon within Gmail, and a handy box shows all of the ways you can reply to a contact — including email, chat, SMS, and Facebook.
• Voice input: Swipe the keyboard, then just speak to select contacts or write an email, complete with punctuation. Period!

Nexus One also features the Gmail updates of Android 2.0, including:

• Multiple Gmail accounts: Sync multiple accounts to the same device and switch between them without leaving the app.
• Undo: A handy ‘undo’ link makes it easier to retrieve messages when you hit archive or delete by mistake. (Note: you can’t yet undo send as you can with the desktop version of Gmail).

 
For more information on Nexus One visit google.com/phone. To learn more about Gmail on this and other Android devices, check out the Gmail page on mobile.google.com/android

From : The Official Gmail Blog

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10. Google Public DNS – a DNS resolution system that doesn’t offer too many features, but it’s free and fast. Very fast.

9. Google Fast Flip – a service that lets you quickly browse news. It’s easy to use and it’s a better way to discover interesting news articles than Google News.

8. Google Squared – an innovative way to dynamically generate collections and facts about each item. It’s an extension of Google Sets and you can use it to create lists.

7. Google Wave – an online platform for collaboration in real-time. While there are many interesting features in Google Wave, Google’s implementation of the Wave protocol is too confusing and difficult to use.

6. Google Translate added new languages, made it easier to find web pages written in other languages and to translate web pages in real-time. You can now use Google Translate in Gmail, Google Docs, Google Groups and many other Google services.

5. Google Maps aggregated information about locations in place pages, started to show more search results and to use its own mapping data in the US. Google also launched Google Maps Navigation, “internet-connected GPS navigation system with voice guidance. It is part of Google Maps for mobile and is available for phones with Android 1.6 and higher.” Unlike other navigation apps, Google’s Android app is free, but it’s limited to the US.

4. Google Image Search added many advanced search options: color filter, size filter, Creative Commons search and an option that lets you find similar images. There’s also a great Android app that helps you search the web visually: Google Goggles.

3. Google Search added a toolbelt with many options that help you refine search results: you can restrict the results to forums and recent web pages, find pages shared by your friends, view page thumbnails and explore related searches. Other changes include a redesigned homepage with bigger buttons and less links, Google Suggest as a standard feature and more sitelinks.

2. Android, Google’s mobile operating system, had 3 major releases and it’s now used by more than 20 devices. Companies like HTC, Motorola, Samsung bet on Android and there are many cool applications that are only available for Android: Goggles, Sky Map, Google Navigation.

1. Google Chrome, the most innovative Google software released last year, continues to be a trendsetter when it comes to simplicity and great performance. It now supports themes and extensions, it has a bookmark sync engine and you can download native versions for Linux and Mac. Chrome is the most significant component of Chrome OS, a browser-centric operating system for notebooks, and a strategic project that helps Google push the web forward. Even if that means improving Internet Explorer.

From: The Google System Blog

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Turn on Green Robot, a new experiment in Gmail Labs, and you’ll see a robot icon next to people who are currently using Android phones. In the case below, Shirley is online with Android, Nicolle R. is using regular Gmail chat, and Chris I. is currently away but also on Android. Slatka is not an angry robot — she’s online with Android but currently busy.

These icons can help you decide whether to tailor your conversation to the type of device that your chat buddy is using. For example, when you know the guy on the other end is using his Android phone, you may decide to send shorter, more concise chat messages.

When your chat buddies log into Gmail, their presence icons will revert to the traditional red, green, and orange status bubbles. In addition, if your chat buddy happens to be logged into both Gmail and Android chat then the traditional Gmail status icons will be shown. Try it out and let us know what you think.

From: Gmail Blog

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