AndroidあるあるLT_20190122.pdf

Transcript

1. Android։ൃ͋Δ͋ΔTips 2019/01/22
3. Android Databinding + MVVM͋Δ͋Δ
4. ಡΈࠐΈதɺ௨৴Τϥʔը໘Λ (CustomViewͱdatabindingΛ͔ͭͬͯʣڞ௨Խ͍ͨ͠
5. https://speakerdeck.com/konifar/loading-loaded-error-dokonihe-wobiao-shi-suruka
6. https://speakerdeck.com/konifar/loading-loaded-error-dokonihe-wobiao-shi-suruka
7. class LoadingAndErrorView @JvmOverloads constructor( context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0 ) : ConstraintLayout(context, attrs, defStyleAttr) { private var binding: LoadingAndErrorBinding = DataBindingUtil.inflate(LayoutInflater.from(context), R.layout.loading_and_error, this, true) fun setState(uiState: UIState) { binding.uiState = uiState } fun setOnClickRetryListener(onClick: () -> Unit) { binding.onClick = View.OnClickListener { onClick.invoke() } } } sealed class UIState { object Loading : UIState() object Loaded : UIState() object Retry : UIState() }
8. class LoadingAndErrorView @JvmOverloads constructor( context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0 ) : ConstraintLayout(context, attrs, defStyleAttr) { private var binding: LoadingAndErrorBinding = DataBindingUtil.inflate(LayoutInflater.from(context), R.layout.loading_and_error, this, true) fun setState(uiState: UIState) { binding.uiState = uiState } fun setOnClickRetryListener(onClick: () -> Unit) { binding.onClick = View.OnClickListener { onClick.invoke() } } } sealed class UIState { object Loading : UIState() object Loaded : UIState() object Retry : UIState() }
9. <?xml version="1.0" encoding="utf-8"?> <layout> <data> <variable name="onClick" type=“android.view.View.OnClickListener” /> <variable name="uiState" type=“${packageName}.common.UIState” /> </data> <androidx.constraintlayout.widget.ConstraintLayout> <ImageView android:visibility="@{uiState == UIState.Retry ? View.VISIBLE : View.GONE}" … /> <TextView android:visibility="@{uiState == UIState.Retry ? View.VISIBLE : View.GONE}" … /> <Button android:visibility="@{uiState == UIState.Retry ? View.VISIBLE : View.GONE}" … /> <ProgressBar android:visibility="@{uiState == UIState.Loading ? View.VISIBLE : View.GONE}" … /> </androidx.constraintlayout.widget.ConstraintLayout> </layout>
10. seald class ͷ databindingͰͭ·ͮ͘
11. <?xml version="1.0" encoding="utf-8"?> <layout> <data> <variable name="onClick" type=“android.view.View.OnClickListener” /> <variable name="uiState" type=“${packageName}.common.UIState” /> </data> <androidx.constraintlayout.widget.ConstraintLayout> <ImageView android:visibility="@{uiState == UIState.Retry ? View.VISIBLE : View.GONE}" … /> <TextView android:visibility="@{uiState == UIState.Retry ? View.VISIBLE : View.GONE}" … /> <Button android:visibility="@{uiState == UIState.Retry ? View.VISIBLE : View.GONE}" … /> <ProgressBar android:visibility="@{uiState == UIState.Loading ? View.VISIBLE : View.GONE}" … /> </androidx.constraintlayout.widget.ConstraintLayout> </layout>
12. <?xml version="1.0" encoding="utf-8"?> <layout> <data> <variable name="onClick" type=“android.view.View.OnClickListener” /> <variable name="uiState" type=“${packageName}.common.UIState” /> </data> <androidx.constraintlayout.widget.ConstraintLayout> <ImageView android:visibility="@{uiState instanceof UIState.Retry ? View.VISIBLE : View.GONE}" … /> <TextView android:visibility="@{uiState instanceof UIState.Retry ? View.VISIBLE : View.GONE}" … /> <Button android:visibility="@{uiState instanceof UIState.Retry ? View.VISIBLE : View.GONE}" … /> <ProgressBar android:visibility="@{uiState instanceof UIState.Loading ? View.VISIBLE : View.GONE}" … /> </androidx.constraintlayout.widget.ConstraintLayout> </layout>
13. <?xml version="1.0" encoding="utf-8"?> <layout> <data> <variable name="onClick" type=“android.view.View.OnClickListener” /> <variable name="uiState" type=“${packageName}.common.UIState” /> </data> <androidx.constraintlayout.widget.ConstraintLayout> <ImageView android:visibility="@{uiState instanceof UIState.Retry ? View.VISIBLE : View.GONE}" … /> <TextView android:visibility="@{uiState instanceof UIState.Retry ? View.VISIBLE : View.GONE}" … /> <Button android:visibility="@{uiState instanceof UIState.Retry ? View.VISIBLE : View.GONE}" … /> <ProgressBar android:visibility="@{uiState instanceof UIState.Loading ? View.VISIBLE : View.GONE}" … /> </androidx.constraintlayout.widget.ConstraintLayout> </layout>
14. <?xml version="1.0" encoding="utf-8"?> <layout> <data> <variable name="onClick" type=“android.view.View.OnClickListener” /> <variable name="uiState" type=“${packageName}.common.UIState” /> </data> <androidx.constraintlayout.widget.ConstraintLayout> <ImageView android:visibility="@{uiState instanceof UIState.Retry ? View.VISIBLE : View.GONE}" … /> <TextView android:visibility="@{uiState instanceof UIState.Retry ? View.VISIBLE : View.GONE}" … /> <Button android:visibility="@{uiState instanceof UIState.Retry ? View.VISIBLE : View.GONE}" … /> <ProgressBar android:visibility="@{uiState instanceof UIState.Loading ? View.VISIBLE : View.GONE}" … /> </androidx.constraintlayout.widget.ConstraintLayout> </layout>
15. <?xml version="1.0" encoding="utf-8"?> <layout> <data> <variable name="onClick" type=“android.view.View.OnClickListener” /> <variable name="uiState" type=“${packageName}.common.UIState” /> </data> <androidx.constraintlayout.widget.ConstraintLayout> <ImageView android:visibility="@{uiState instanceof UIState.Retry ? View.VISIBLE : View.GONE}" … /> <TextView android:visibility="@{uiState instanceof UIState.Retry ? View.VISIBLE : View.GONE}" … /> <Button android:visibility="@{uiState instanceof UIState.Retry ? View.VISIBLE : View.GONE}" … /> <ProgressBar android:visibility="@{uiState instanceof UIState.Loading ? View.VISIBLE : View.GONE}" … /> </androidx.constraintlayout.widget.ConstraintLayout> </layout>
16. <?xml version="1.0" encoding="utf-8"?> <layout xmlns:android="http: //schemas.android.com/apk/res/android" xmlns:app="http: //schemas.android.com/apk/res-auto"> <data> <variable name="viewModel" type=“${packageName}.presentation.demo.DemoViewModel” /> </data> <androidx.constraintlayout.widget.ConstraintLayout android:layout_width="match_parent" android:layout_height="match_parent"> <${packageName}.view.LoadingAndErrorView android:layout_width="match_parent" android:layout_height="match_parent" app:onRetry="@{viewModel ::retry}" app:uiState="@{viewModel.uiState}" /> </androidx.constraintlayout.widget.ConstraintLayout> </layout>
17. <?xml version="1.0" encoding="utf-8"?> <layout xmlns:android="http: //schemas.android.com/apk/res/android" xmlns:app="http: //schemas.android.com/apk/res-auto"> <data> <variable name="viewModel" type=“${packageName}.presentation.demo.DemoViewModel” /> </data> <androidx.constraintlayout.widget.ConstraintLayout android:layout_width="match_parent" android:layout_height="match_parent"> <${packageName}.view.LoadingAndErrorView android:layout_width="match_parent" android:layout_height="match_parent" app:onRetry="@{viewModel ::retry}" app:uiState="@{viewModel.uiState}" /> </androidx.constraintlayout.widget.ConstraintLayout> </layout>
18. object LoadingStateViewBindings { @BindingAdapter("app:uiState") @JvmStatic fun setState(loadingAndErrorView: LoadingAndErrorView, uiState: UIState?) { loadingState ?.let { loadingAndErrorView.setState(it) } } @BindingAdapter("app:onRetry") @JvmStatic fun setRetry(loadingAndErrorView: LoadingAndErrorView, onClick: () -> Unit) { loadingAndErrorView.setOnClickRetryListener { onClick.invoke() } } }
19. object LoadingStateViewBindings { @BindingAdapter("app:uiState") @JvmStatic fun setState(loadingAndErrorView: LoadingAndErrorView, uiState: UIState?) { loadingState ?.let { loadingAndErrorView.setState(it) } } @BindingAdapter("app:onRetry") @JvmStatic fun setRetry(loadingAndErrorView: LoadingAndErrorView, onClick: () -> Unit) { loadingAndErrorView.setOnClickRetryListener { onClick.invoke() } } }
20. <?xml version="1.0" encoding="utf-8"?> <layout xmlns:android="http: //schemas.android.com/apk/res/android" xmlns:app="http: //schemas.android.com/apk/res-auto"> <data> <variable name="viewModel" type=“${packageName}.presentation.demo.DemoViewModel” /> </data> <androidx.constraintlayout.widget.ConstraintLayout android:layout_width="match_parent" android:layout_height="match_parent"> <${packageName}.view.LoadingAndErrorView android:layout_width="match_parent" android:layout_height="match_parent" app:onRetry="@{viewModel ::retry}" app:uiState="@{viewModel.uiState}" /> </androidx.constraintlayout.widget.ConstraintLayout> </layout>
21. class DemoViewModel @Inject constructor() : ViewModel(), LifecycleObserver { val uiState: MutableLiveData<UIState> = MutableLiveData() val message: MutableLiveData<String> = MutableLiveData() private val disposables = CompositeDisposable() @OnLifecycleEvent(Lifecycle.Event.ON_RESUME) fun onResume() { Completable.timer(3, TimeUnit.SECONDS) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .doOnSubscribe { uiState.value = UIState.Loading } .doFinally { uiState.value = UIState.Retry } .subscribeBy( onComplete = { Timber.d("onComplete") } ) .addTo(disposables) } @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE) fun onPause() { disposables.clear() } fun retry() { message.value = "onClick Retry!" } }
22. class DemoViewModel @Inject constructor() : ViewModel(), LifecycleObserver { val uiState: MutableLiveData<UIState> = MutableLiveData() val message: MutableLiveData<String> = MutableLiveData() private val disposables = CompositeDisposable() @OnLifecycleEvent(Lifecycle.Event.ON_RESUME) fun onResume() { Completable.timer(3, TimeUnit.SECONDS) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .doOnSubscribe { uiState.value = UIState.Loading } .doFinally { uiState.value = UIState.Retry } .subscribeBy( onComplete = { Timber.d("onComplete") } ) .addTo(disposables) } @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE) fun onPause() { disposables.clear() } fun retry() { message.value = "onClick Retry!" } }
23. class DemoViewModel @Inject constructor() : ViewModel(), LifecycleObserver { val uiState: MutableLiveData<UIState> = MutableLiveData() val message: MutableLiveData<String> = MutableLiveData() private val disposables = CompositeDisposable() @OnLifecycleEvent(Lifecycle.Event.ON_RESUME) fun onResume() { Completable.timer(3, TimeUnit.SECONDS) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .doOnSubscribe { uiState.value = UIState.Loading } .doFinally { uiState.value = UIState.Retry } .subscribeBy( onComplete = { Timber.d("onComplete") } ) .addTo(disposables) } @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE) fun onPause() { disposables.clear() } fun retry() { message.value = "onClick Retry!" } }
24. ϝοηʔδͷදࣔʹLiveDataΛ͔ͭ͏
25. class DemoViewModel @Inject constructor() : ViewModel(), LifecycleObserver { val uiState: MutableLiveData<UIState> = MutableLiveData() val message: MutableLiveData<String> = MutableLiveData() private val disposables = CompositeDisposable() @OnLifecycleEvent(Lifecycle.Event.ON_RESUME) fun onResume() { Completable.timer(3, TimeUnit.SECONDS) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .doOnSubscribe { uiState.value = UIState.Loading } .doFinally { uiState.value = UIState.Retry } .subscribeBy( onComplete = { Timber.d("onComplete") } ) .addTo(disposables) } @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE) fun onPause() { disposables.clear() } fun retry() { message.value = "onClick Retry!" } }
26. class DemoViewModel @Inject constructor() : ViewModel(), LifecycleObserver { val uiState: MutableLiveData<UIState> = MutableLiveData() val message: MutableLiveData<String> = MutableLiveData() private val disposables = CompositeDisposable() @OnLifecycleEvent(Lifecycle.Event.ON_RESUME) fun onResume() { Completable.timer(3, TimeUnit.SECONDS) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .doOnSubscribe { uiState.value = UIState.Loading } .doFinally { uiState.value = UIState.Retry } .subscribeBy( onComplete = { Timber.d("onComplete") } ) .addTo(disposables) } @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE) fun onPause() { disposables.clear() } fun retry() { message.value = "onClick Retry!" } }
27. class DemoViewModel @Inject constructor() : ViewModel(), LifecycleObserver { val uiState: MutableLiveData<UIState> = MutableLiveData() val message: SingleLiveEvent<String> = SingleLiveEvent() private val disposables = CompositeDisposable() @OnLifecycleEvent(Lifecycle.Event.ON_RESUME) fun onResume() { Completable.timer(3, TimeUnit.SECONDS) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .doOnSubscribe { uiState.value = UIState.Loading } .doFinally { uiState.value = UIState.Retry } .subscribeBy( onComplete = { Timber.d("onComplete") } ) .addTo(disposables) } @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE) fun onPause() { disposables.clear() } fun retry() { message.value = "onClick Retry!" } }
28. class DemoViewModel @Inject constructor() : ViewModel(), LifecycleObserver { val uiState: MutableLiveData<UIState> = MutableLiveData() val message: SingleLiveEvent<String> = SingleLiveEvent() private val disposables = CompositeDisposable() @OnLifecycleEvent(Lifecycle.Event.ON_RESUME) fun onResume() { Completable.timer(3, TimeUnit.SECONDS) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .doOnSubscribe { uiState.value = UIState.Loading } .doFinally { uiState.value = UIState.Retry } .subscribeBy( onComplete = { Timber.d("onComplete") } ) .addTo(disposables) } @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE) fun onPause() { disposables.clear() } fun retry() { message.value = "onClick Retry!" } }
29. class DemoFragment : BaseFragment() { private lateinit var binding: FragmentDemoBinding override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { val view = inflater.inflate(R.layout.fragment_demo, container, false) binding = FragmentDemoBinding.bind(view).apply { viewModel = (activity as DemoActivity).obtainViewModel().also { subscribe(it) } } return view } private fun subscribe(viewModel: DemoViewModel) { lifecycle.addObserver(viewModel) viewModel.message.observe(this, Observer { showToast(it) }) } companion object { fun newInstance(): DemoFragment = DemoFragment() } }
30. class DemoFragment : BaseFragment() { private lateinit var binding: FragmentDemoBinding override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { val view = inflater.inflate(R.layout.fragment_demo, container, false) binding = FragmentDemoBinding.bind(view).apply { viewModel = (activity as DemoActivity).obtainViewModel().also { subscribe(it) } } return view } private fun subscribe(viewModel: DemoViewModel) { lifecycle.addObserver(viewModel) viewModel.message.observe(this, Observer { showToast(it) }) } companion object { fun newInstance(): DemoFragment = DemoFragment() } }
31. LiveData#observeͷୈҰҾ਺ʹthisΛ͍Ε͕ͪ
32. class DemoFragment : BaseFragment() { private lateinit var binding: FragmentDemoBinding override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { val view = inflater.inflate(R.layout.fragment_demo, container, false) binding = FragmentDemoBinding.bind(view).apply { viewModel = (activity as DemoActivity).obtainViewModel().also { subscribe(it) } } return view } private fun subscribe(viewModel: DemoViewModel) { lifecycle.addObserver(viewModel) viewModel.message.observe(this, Observer { showToast(it) }) } companion object { fun newInstance(): DemoFragment = DemoFragment() } }
33. class DemoFragment : BaseFragment() { private lateinit var binding: FragmentDemoBinding override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { val view = inflater.inflate(R.layout.fragment_demo, container, false) binding = FragmentDemoBinding.bind(view).apply { viewModel = (activity as DemoActivity).obtainViewModel().also { subscribe(it) } } return view } private fun subscribe(viewModel: DemoViewModel) { lifecycle.addObserver(viewModel) viewModel.message.observe(viewLifecycleOwner, Observer { showToast(it) }) } companion object { fun newInstance(): DemoFragment = DemoFragment() } }
34. class DemoFragment : BaseFragment() { private lateinit var binding: FragmentDemoBinding override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { val view = inflater.inflate(R.layout.fragment_demo, container, false) binding = FragmentDemoBinding.bind(view).apply { viewModel = (activity as DemoActivity).obtainViewModel().also { subscribe(it) } } return view } private fun subscribe(viewModel: DemoViewModel) { lifecycle.addObserver(viewModel) viewModel.message.observe(viewLifecycleOwner, Observer { showToast(it) }) } companion object { fun newInstance(): DemoFragment = DemoFragment() } } onActivityCreatedͳͲͰobserve͍ͯ͠Δͱ FragmentΛdetachͯ͠࠶attach͢ΔͱɺόάΔ͜ͱ͕͋Δ
35. class DemoFragment : BaseFragment() { private lateinit var binding: FragmentDemoBinding override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { val view = inflater.inflate(R.layout.fragment_demo, container, false) binding = FragmentDemoBinding.bind(view).apply { viewModel = (activity as DemoActivity).obtainViewModel().also { subscribe(it) } } return view } private fun subscribe(viewModel: DemoViewModel) { lifecycle.addObserver(viewModel) viewModel.message.observe(viewLifecycleOwner, Observer { showToast(it) }) } companion object { fun newInstance(): DemoFragment = DemoFragment() } }
36. https://github.com/googlesamples/android-architecture-components/pull/470/ files#diff-7991ecd332880643c94e414441e0268aR61
37. LiveDataΛdatabinding͢Δͱ͖ setLifecycleOwnerΘ͢Ε͕ͪ
38. class DemoFragment : BaseFragment() { private lateinit var binding: FragmentDemoBinding override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { val view = inflater.inflate(R.layout.fragment_demo, container, false) binding = FragmentDemoBinding.bind(view).apply { viewModel = (activity as DemoActivity).obtainViewModel().also { subscribe(it) } } return view } private fun subscribe(viewModel: DemoViewModel) { lifecycle.addObserver(viewModel) viewModel.message.observe(this, Observer { showToast(it) }) } companion object { fun newInstance(): DemoFragment = DemoFragment() } }
39. class DemoFragment : BaseFragment() { private lateinit var binding: FragmentDemoBinding override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { val view = inflater.inflate(R.layout.fragment_demo, container, false) binding = FragmentDemoBinding.bind(view).apply { viewModel = (activity as DemoActivity).obtainViewModel().also { subscribe(it) } } binding.setLifecycleOwner(viewLifecycleOwner) return view } private fun subscribe(viewModel: DemoViewModel) { lifecycle.addObserver(viewModel) viewModel.message.observe(this, Observer { showToast(it) }) } companion object { fun newInstance(): DemoFragment = DemoFragment() } } class DemoFragment : BaseFragment() { private lateinit var binding: FragmentDemoBinding override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { val view = inflater.inflate(R.layout.fragment_demo, container, false) binding = FragmentDemoBinding.bind(view).apply { viewModel = (activity as DemoActivity).obtainViewModel().also { subscribe(it) } } binding.setLifecycleOwner(viewLifecycleOwner) return view } private fun subscribe(viewModel: DemoViewModel) { lifecycle.addObserver(viewModel) viewModel.message.observe(viewLifecyclerOwner, Observer { showToast(it) }) } companion object { fun newInstance(): DemoFragment = DemoFragment() } }
40. ͋Δ͋Δ·ͱΊ • seald classͷdatabindingͰ == ͔ͭͬͯͭ·͖͕ͮͪ • Πϕϯτ௨஌ʹँͬͯLiveData࢖͍͕ͪ • LiveData#observeͷୈҰҾ਺ʹthisΛ͍Ε͕ͪ • setLifecycleOwnerΘ͢Ε͕ͪ
41. ͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠
42. • https://speakerdeck.com/konifar/loading-loaded-error-dokonihe-wobiao-shi-suruka • https://engineering.udacity.com/simplifying-ui-states-with-kotlin-sealed-classes-and-databinding-2128112d0631 • https://medium.com/androiddevelopers/livedata-with-snackbar-navigation-and-other-events-the-singleliveevent-case-ac2622673150 • https://github.com/googlesamples/android-architecture-components