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This course introduces the new features offered to developers and consumers in Android 4.1 Jelly Bean. Author Joseph Lowery first explains how you can expect the update to roll out to devices, and then shows how to install the Android SDK on Windows and Mac, select a device emulator, create a sample app, and prep it for publication on Google Play. Along the way, the course explores the smoother interface (codenamed Project Butter), notifications, advanced text manipulation, and security improvements that will be of interest to Android developers, and describes how those features translate for consumers on the device side.
A wide range of experts agree that Jelly Bean is the most secure version of Android released to date. In this lesson, we'll take a look at the primary security enhancements, along with a personal security measure. Android 4.1 is the first Android OS to properly implement address space layout randomization, or ASLR, security. In brief, ASLR randomizes where memory processes are mapped, thus reducing the probability of successful hacking. This update has been judged by the expert to be a vast improvement over the initial implementation in Ice Cream Sandwich, or version 4.0.
Another under the hood security enhancement has to do with the low-level system logs. Previously, any app had permission to read the logs of other apps and thus glean any sensitive data there. This permission known as read_logs has been removed in Jelly Bean. I want to show you another Jelly Bean security enhancement that has a more personal impact. I've ever lost my phone, but my daughter has, multiple times. Luckily, she outgrew the habit before phones had lock screens.
Now if she lost her phone and it was found, to the person who found it couldn't get pass the lock screen to get the owner info. Jelly Bean now has a setting that allows you to display a lock screen message like the one shown here at the top of my phone that gives a number to call. Let me show you where that option is, and at the same time, I'll add an offer of a cash reward. So how that I add that to my lock screen? Well, first I'll unlock the phone. Now let me go into Settings, and in the Personal section, I'll tap Security, and now I'll tap Owner info.
There you can see my current message. Let me move the cursor to the end of the message and add in my Cash Reward option. So now I can tap Home, turn off the phone, and then when I turn it back on, there at the top of the lock screen you can see my new message. I discovered one thing while I was trying out different messages that I want to share. If the message is too long to display on a single line, it scrolls across like a kind of ticker-tape. So don't delay! Add that lock screen message today.
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