It has been 5 years since I first released my application for practicing musicians, JustPractice (currently rated 4 stars on Google's play store)
After a major rewrite, I have a totally new modern version with great support for tablets as well.
Still free of charge, no advertisements, and I use it daily myself and have tailored it to be as easy to use and useful as possible.
Search for "JustPracticePro" on Google Play, and let me know how it goes.
The basic premise of this application is, Plan your Practice, and practice your plan. You define your weekly plan i.e. each piece you want to practice, your goal, how long each day, etc. The application will show you your progress, and help you stay true to your goal.
You have many practice tools included, a timer, metronome, audio and video recorder, and notes for each practice session.
Here is a screenshot of the main screen:
The first tab shows your practice for each day of the month
Sliding to the right, you see your weekly view:
Choosing one of the rows, will open the actual practice session activity, which looks like this:
These are just some of the screens. If you have a tablet, then I make use of the extra space as well.
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No pain, no pain.