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Rafael Toledo
August 25, 2017
Programming
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Fragments
Apresentada na Android Dev Conference 2017
Rafael Toledo
August 25, 2017
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Transcript
FRAGMENTS Rafael Toledo @_rafaeltoledo
None
FRAGMENTS
None
POR QUE USAR FRAGMENTS?
POR QUE NÃO USAR FRAGMENTS?
LIFECYCLE
LIFECYCLE
LIFECYCLE
LIFECYCLE
LIFECYCLE
LIFECYCLE [CRIES IN ANDROIDISH]
WTF??? • IllegalStateException • getActivity() == null • executePendingTransactions() •
<fragment>
WTF???
EM 2017, VALE A PENA USAR FRAGMENTS?
EM 2017, VALE A PENA USAR FRAGMENTS?
DIFERENTES LAYOUTS, DIFERENTES TELAS
DIFERENTES TAMANHOS DE TELA
DIFERENTES TAMANHOS DE TELA Nexus One!
Quem usa tablet hoje em dia???
DIFERENTES TAMANHOS DE TELA Moto C (480x854) Samsung Galaxy S8+
(1440x2960)
DIFERENTES TAMANHOS DE TELA
Quem usa app em landscape???
Quem usa app em landscape??? EU!
ENCAPSULAMENTO DA NAVEGAÇÃO
ENCAPSULAMENTO DE NAVEGAÇÃO
ENCAPSULAMENTO DE NAVEGAÇÃO getSupportFragmentManager() .beginTransaction() .add(R.id.container, new Step1Fragment()) .addToBackStack(null) .commit();
// Back button = fragmentManager.popBackStack()
ENCAPSULAMENTO DE NAVEGAÇÃO getSupportFragmentManager() .beginTransaction() .add(R.id.container, new Step1Fragment()) .addToBackStack(null) .commit();
BACKSTACK? !=
BACKSTACK? Volta para a home
BACKSTACK?
BACKSTACK? Volta para a home?
BACKSTACK? Toolbar na Activity Fragment com conteúdo
BACKSTACK getSupportFragmentManager() .beginTransaction() .add(R.id.container, new Step1Fragment()) .addToBackStack(null) // ??? .commit();
BACKSTACK getSupportFragmentManager() .beginTransaction() .add(R.id.container, new Step1Fragment()) .addToBackStack("Cart") .commit();
BACKSTACK getSupportFragmentManager() .beginTransaction() .add(R.id.container, new Step1Fragment()) .addToBackStack("Cart") .commit(); fragmentManager.popBackStack("Cart"); fragmentManager.popBackStack("Cart",
FragmentManager.POP_BACK_STACK_INCLUSIVE);
STATEFUL DIALOGS
POR QUE EU PRECISO DE DIALOGS COM ESTADO?
MUDANÇAS DE CONFIGURAÇÃO
EVITANDO INTERAÇÕES DEAD-END
CUIDADO COM O DIALOG INFINITO
COMPONENTIZAÇÃO DA UI
COMPONENTIZAÇÃO DA UI Fragments como uma porção da Activity View
Fragment View Fragment Fragment Activity Fragment Activity
// Dentro do Fragment ((MainActivity) getActivity()).method(); COMPONENTIZAÇÃO DA UI -
DON'T!
// Dentro do Fragment ((MainActivity) getActivity()).method(); COMPONENTIZAÇÃO DA UI -
DON'T!
// Dentro da View ((MainActivity) context).method(); COMPONENTIZAÇÃO DA UI -
DON'T!
// Dentro da View ((MainActivity) context).method(); COMPONENTIZAÇÃO DA UI -
DON'T!
OLHA O REÚSO...
FALANDO EM VIEWS...
CUSTOM VIEWS x FRAGMENTS • Micro interações isoladas? Custom Views!
• Interação complexa, lida com rede, hardware, intents? Fragments! • View Pager? •Com interação rica (é uma tela de fato?) - Fragments! •Conteúdo simples (carrossel, vitrine, cards?) - Custom Views!
VOLTANDO...
COMO TROCAR DADOS ENTRE FRAGMENTS?
COMO TROCAR DADOS ENTRE FRAGMENTS? • EventBus?
COMO TROCAR DADOS ENTRE FRAGMENTS? • EventBus?
COMO TROCAR DADOS ENTRE FRAGMENTS? • EventBus? • Através da
Activity, implementando um listener
COMO TROCAR DADOS ENTRE FRAGMENTS? • EventBus? • Através da
Activity, implementando um listener • Architecture Components!
COMO TROCAR DADOS ENTRE FRAGMENTS? • EventBus? • Através da
Activity, implementando um listener • Architecture Components!
// No Fragment viewModel = ViewModelProviders.of(this) .get(MyViewModel.class); COMO TROCAR DADOS
ENTRE FRAGMENTS?
// No Fragment viewModel = ViewModelProviders.of(getActivity()) .get(MyViewModel.class); COMO TROCAR DADOS
ENTRE FRAGMENTS?
// No Fragment viewModel = ViewModelProviders.of(getActivity()) .get(MyViewModel.class); COMO TROCAR DADOS
ENTRE FRAGMENTS?
INICIALIZAÇÃO DE COMPONENTES
<fragment android:name="com.google.android.gms.maps.MapFragment" android:id="@+id/map" android:layout_width="match_parent" android:layout_height="match_parent" /> INICIALIZAÇÃO DE COMPONENTES
MapFragment mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.map); INICIALIZAÇÃO DE COMPONENTES
MapView mapView; @Override public void onCreate(Bundle savedInstanceState) { ... mapView
= findViewById(R.id.map); } INICIALIZAÇÃO DE COMPONENTES
@Override public void onStart() { super.onStart(); mapView.onStart(); } @Override public
void onStop() { mapView.onStop(); super.onStop(); } INICIALIZAÇÃO DE COMPONENTES
@Override public void onStart() { super.onStart(); mapView.onStart(); } @Override public
void onStop() { mapView.onStop(); super.onStop(); } INICIALIZAÇÃO DE COMPONENTES Boilerplate?
<fragment android:name="com.google.android.gms.maps.MapFragment" android:id="@+id/map" android:layout_width="match_parent" android:layout_height="match_parent" app:apiKey="1234567890abcdef" /> INICIALIZAÇÃO DE COMPONENTES
<fragment android:name="com.google.android.gms.maps.MapFragment" android:id="@+id/map" android:layout_width="match_parent" android:layout_height="match_parent" app:apiKey="1234567890abcdef" /> INICIALIZAÇÃO DE COMPONENTES
@Override public void onInflate(Context context, AttributeSet attrs, Bundle savedInstanceState) {
... } INICIALIZAÇÃO DE COMPONENTES
@Override public void onInflate(Context context, AttributeSet attrs, Bundle savedInstanceState) {
... } INICIALIZAÇÃO DE COMPONENTES
@Override public void onInflate(Context context, AttributeSet attrs, Bundle savedInstanceState) {
... } INICIALIZAÇÃO DE COMPONENTES
DICAS FINAIS • Sempre guarde estado dos seus Fragments! •
setRetainInstance(true) não deve ser usado para Fragments com Views! (Architecture Components usa!)
QUE TAL DAR UMA SEGUNDA CHANCE AOS FRAGMENTS?
Fragment Tricks youtube.com/watch?v=eUG3VWnXFtg What the Fragment? youtube.com/watch?v=k3IT-IJ0J98 Documentação developer.android.com/guide/components/fragments.html LINKS
Fragment Tricks youtube.com/watch?v=eUG3VWnXFtg What the Fragment? youtube.com/watch?v=k3IT-IJ0J98 Documentação developer.android.com/guide/components/fragments.html LINKS
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