LinkedIn has finally released LinkedIn for Android Beta app for devices with Android 2.1 and above. To download and install LinkedIn on Android, you need to go through a rather long process, here’s the how to:
How to Install LinkedIn Android APK
Step 1: On your Android phone, go to Settings and tap on Applications

Step 2: Turn “Unknown sources” on. A warning box will appear, read it along and tap on “OK”.
Step 3: Now open your browser on Android and point it to http://bit.ly/LinkedInAndroidBeta. It will download Android LinkedIn APK onto your mobile.
Step 4: Tap on the downloaded LinkedIn.apk. Look for LinkedIn.apk in browser’s download history or in Notifications. Installer will launch.
Step 5: Read the warning, then tap on “Install” if you want to install LinkedIn for Android.
Step 6: Once installed, tap on “Open” to start the app. It will also show in the list of apps.
If you face any problems, join LinkedIn for Android group on LinkedIn.
Installation instructions and images via LinkedIn Mobile.