Comments (2)
In general, I think you shouldn't combine properties: you should write your own function that generates a Read(Only|Write)Property
or Lazy<T>
that has the two features you are interested in.
class MainActivity : AppCompatActivity(), HasFindViewById {
val username by editText(R.id.username)
val password by editText(R.id.password)
fun onCreate() { ... }
}
implemented by
fun HasFindViewById.editText(@IdRes editText: Int): Lazy<EditText> =
lazy(LazyThreadSafetyMode.NONE) {
findViewById<EditText>(editText)
}
fun HasFindViewById.textView(@IdRes editText: Int) : Lazy<TextView>
// same implementation
// because I don't want to write the same functions for ViewGroup and Fragment and Activity...
interface HasFindViewById {
fun <T : View?> findViewById(id: Int): T
}
On the other hand, this a very common use case and it is optimized by a special tool (android kotlin extensions) so I would classify that as a overuse of the pattern.
from guide-to-kotlin.
Thanks, I tweaked it a bit but overall it's good.
The response: List<T> by data
was a bit of a hack, but I guess it can make sense. 🤔
I still think delegates are a bit tricky, I have for example never seen a lazy
and vetoable
at the same time. I'm actually not even sure if it is possible.
from guide-to-kotlin.
Related Issues (12)
- Argument names are followed by colon not semi-colon before type HOT 2
- Collections initializers HOT 3
- data class and objects HOT 5
- Visibility modifiers: package visibility does exist HOT 4
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- setValue() in MyContract interface is not a setter HOT 1
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from guide-to-kotlin.