Concurrency in SQLite database

How to achieve concurrency in SQLite database? As per documents it is possible using WAL(Write-Ahead Logging).But, I dont know how to implement it.

In my app I want to read data from db on main thread and at the same time a background thread is writing/inserting some data in the same table. On executing read and write query at same time app stops responding until insertion isn't done. Is concurrency possible in SQLite, and how?