Android Fragment Tutorials

A Fragment represents a behavior or a portion of user interface in a FragmentActivity.

Open a fragment from another fragment

activity!!.supportFragmentManager.beginTransaction()
.replace(R.id.container, ProductFragment())
.commitNow()

If doing it in an Activity, just remove the activity!! part.

Passing an object to a fragment using Gson

Serialize an object

val product = Product(id=1, name="Kotlin Book", price=10f)
val productString = Gson().toJson(product)
ProductEditFragment.newInstance(productString)

Deserialize it

val product = Gson().fromJson(productString, Product::class.java)