You can download the update directly on your device through the Google Play Store or by using the link which follows:
Twitter for Android version 4.1.2 has the following new features and improvements:
- Now when you read a Direct message it will be marked as read in all of your official Twitter apps (including twitter.com, mobile.twitter.com, Twitter for Mac, Twitter for iPad and TweetDeck) and vice versa.
- As you search you can now see user avatars and clear past searches from the dropdown menu
- Richer search results indicate when there are new Tweets for your query and show account results with bios and social context.
You can also download the latest version of Twitter for iOS which brings the same improvements.