Drums for Practice is an Android App that plays drum loops that you can use for practice.

With this Android App, you can practice your Guitar, Bass or Keyboard. Just plug-in your earphones or plug your Android device to an amp and play along with your preferred drum loops.

Features:

• Easy to operate interface.
• Scroll to pick a loop, and touch to play or stop a drum loop.
• Adjust the volume with it's volume slider
• The program includes various fully rendered (not midi) patterns:
• 4 tempos of Rock patterns
• 5 tempos of Blues patterns
• 3 tempos of Metal Patterns
• 3 Lead Rock drum patterns for solo lead guitar practice
• 5 tempos of basic metronome

More patterns will come in future updates, expect to see Country, Train and Reggae patterns.

I found a review of the Android app on Youtube, this may help you understand the app more:

Related Hardware:
The Best Electronic Drum Set