Machan since you are looking for something which supports android and does not cost much, I'd suggest you to go for
LINTELEK ID115Plus HR Fitness Tracker
This,
*Tracks your daily steps, calorie consumed, distance.
*Monitors continuous heart rate.
*Records the duration of exercise, average pace.
*Shows the notifications of the incoming calls, messages etc.
The battery life is also reasonable in this one. Full charge requires about 1-2 hours and the standby time can be up to 5-7 days after fully charged. This particular
LINTELEK ID115Plus HR Fitness Tracker comes with an extra band. So compared to fitbit watches which cost you around $150- $200, this is worth the money you spend.