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Android Architecture Components
$ Cooking Programmer
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Cooking Programmer
@d_forest
Android Engineer
Software Engineer
https://prty.jp
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Android Architecture Components
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https://proandroiddev.com/5-common-mistakes-when-using-architecture-components-403e9899f4cb
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No content
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https://note.mu/d_forest/n/n9c2dcf155f34
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2
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Fragment LiveData observer
ViewModel
Mutable LiveData View
ViewModel
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Fragment LiveData observer
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class BooksFragment: Fragment() {
private lateinit var viewModel: BooksViewModel
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
return inflater.inflate(R.layout.fragment_books, container)
}
override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)
viewModel = ViewModelProviders.of(this).get(BooksViewModel::class.java)
viewModel.liveData.observe(this, Observer { updateViews(it) })
}
...
}
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class BooksFragment: Fragment() {
private lateinit var viewModel: BooksViewModel
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
return inflater.inflate(R.layout.fragment_books, container)
}
override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)
viewModel = ViewModelProviders.of(this).get(BooksViewModel::class.java)
viewModel.liveData.observe(this, Observer { updateViews(it) })
}
...
}
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viewModel.liveData.observe(this, Observer { updateViews(it) })
Activity
Fragment
e.g. detach onDestroy() Observer
Fragment attach/detach Observer
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viewModel.liveData.observe(viewLifecycleOwner, Observer {...
public class Fragment {
public LifecycleOwner getViewLifecycleOwner()
}
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class BooksFragment: Fragment() {
private lateinit var viewModel: BooksViewModel
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
return inflater.inflate(R.layout.fragment_books, container)
}
override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)
viewModel = ViewModelProviders.of(this).get(BooksViewModel::class.java)
viewModel.liveData.observe(viewLifecycleOwner, Observer { updateViews(it) })
}
...
}
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Mutable LiveData View
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class CatalogueViewModel : ViewModel() {
val products = MutableLiveData()
}
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class CatalogueViewModel : ViewModel() {
val products = MutableLiveData()
}
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val products = MutableLiveData()
View LiveData
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private val promotions = MutableLiveData()
fun getPromotions(): LiveData = promotions
private val _offers = MutableLiveData()
val offers: LiveData = _offers
OR
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class CatalogueViewModel : ViewModel() {
private val _offers = MutableLiveData()
val offers: LiveData = _offers
}
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THANK YOU!