Android Training Program - Portugal, Aula 3

Aula #3: Fundações II 🏘

Como é que customizamos e embelezamos a nossa aplicação? O que acontece quando o utilizador carrega num botão?

- Layouts
- Views (TextView, ImageView, Button, etc.)
- Interação com o utilizador

1. Android Training Program PORTUGAL Aula #3 Fundações II
2. • Sejam excelentes uns para os outros • Fale mais alto se vir ou ouvir alguma coisa • O assédio não é tolerado • Pratique "Sim e" um ao outro Código de conduta Mais informações: http://bit.ly/2IhF0l3
3. Andres-Leonardo Martinez-Ortiz Google Carlos Mota Formador Renato Almeida Formador @davilagrau @cafonsomota @tallnato Equipa Daniela Ferreira Gestora de comunidades
4. • 12 aulas • 1h30 cada aula • ~1 aula por semana • 14 Outubro a 16 Dezembro • YouTube live • Suporte assíncrono contínuo via Discord/email • Todo o código disponível no GitHub Photo by Arif Riyanto on Unspla O programa
5. #0 14 de Outubro Pronto para começar #1 21 de Outubro Bem-vindos ao Android #2 28 de Outubro Fundações I #3 04 de Novembro Fundações II #4 11 de Novembro Fundações III #5 18 de Novembro Listas, listas e mais listas #6 25 de Novembro Jetpack, Jetpack, Jetpack! #7 - #8 02 - 03 de Dezembro Firebase #9 - #10 09 - 10 de Dezembro MLKit & TensorFlow #11 16 de Dezembro Resumo Semana Semana Calendário ✅ Direto ✅ ✅
6. Sumário Photo by Mika Baumeister on Unsplash • Resumo da aula anterior • Layouts, views, interações • Passaporte para a Google • Kotlin para principiantes • Sexta-Feira negra
7. http://events.withgoogle.com/atp2020 ✉ atp-suporte@googlegroups.com http://bit.ly/atp2020-youtube http://bit.ly/atp2020-discord Links
8. http://bit.ly/atp2020-live
9. http://bit.ly/atp2020-codelabs
10. http://bit.ly/kahoot-aula3
11. Resumo da Aula #2
12. AndroidManifest.xml <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="pt.atp.bobi"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/Theme.Bobi"> ... </application> </manifest>
13. Activity
14. Fragment
15. Intents +351990000001
16. Navegação
17. Aula #3
18. Layouts
19. • Descreve a interface gráfica • Tipicamente declarado num XML, mas pode ser construído programaticamente Layouts
20. • Os elementos estão alinhados numa direção ◦ Horizontal ◦ Vertical • Os filhos podem ter pesos LinearLayout
21. LinearLayout <LinearLayout ... android:orientation="horizontal"> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Bobi" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Max" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Rex" /> </LinearLayout>
22. LinearLayout <LinearLayout ... android:orientation="horizontal"> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Bobi" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="Max" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Rex" /> </LinearLayout>
23. LinearLayout <LinearLayout ... android:orientation="vertical"> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Bobi" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Max" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Rex" /> </LinearLayout>
24. LinearLayout <LinearLayout ... android:orientation="vertical"> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="Bobi" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Max" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Rex" /> </LinearLayout>
25. • Dispõe os elementos em posições relativas ◦ Relativo ao pai, ou a outros elementos ◦ Esquerda ou direita, cima ou baixo • Permite ‘achatar’ o layout, melhorando a performance RelativeLayout
26. RelativeLayout <RelativeLayout ...> <Button android:text="Bobi" android:id="@+id/bobi" android:layout_width="match_parent" android:layout_height="wrap_content" /> <Button android:text="Rex" android:id="@+id/rex" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_below="@id/bobi" android:layout_alignParentStart="true" android:layout_toStartOf="@+id/max" /> <Button android:text="Max" android:id="@id/max" android:layout_width="96dp" android:layout_height="wrap_content" android:layout_below="@id/bobi" android:layout_alignParentEnd="true" /> <Button android:text="Luna" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/max" android:layout_centerHorizontal="true" /> </RelativeLayout>
27. <RelativeLayout ...> <Button android:id="@+id/bobi" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:text="Bobi" /> <Button android:id="@+id/rex" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/bobi" android:layout_alignStart="@id/bobi" android:text="Rex" /> <Button android:id="@+id/luna" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/rex" android:layout_alignStart="@id/rex" android:text="Luna" /> <Button android:id="@+id/max" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/luna" android:layout_alignStart="@id/luna" android:text="Max" /> </RelativeLayout> RelativeLayout
28. <RelativeLayout ...> <Button android:id="@+id/bobi" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="Bobi" /> <Button android:id="@+id/rex" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/bobi" android:layout_alignStart="@id/bobi" android:text="Rex" /> <Button android:id="@+id/luna" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/rex" android:layout_alignStart="@id/rex" android:text="Luna" /> <Button android:id="@+id/max" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/luna" android:layout_alignStart="@id/luna" android:text="Max" /> </RelativeLayout> RelativeLayout
29. • Os elementos estão dispostos numa grelha • Os elementos podem ocupar mais do que uma coluna ou linha GridLayout
30. GridLayout <GridLayout ... android:columnCount="3"> <Button android:layout_row="0" android:layout_column="0" android:text="Bobi" /> <Button android:layout_row="0" android:layout_column="1" android:text="Rex" /> <Button android:layout_row="0" android:layout_rowSpan="2" android:layout_column="2" android:layout_gravity="fill_vertical" android:text="Luna" /> <Button android:layout_row="1" android:layout_column="0" android:layout_columnSpan="2" android:layout_gravity="fill_horizontal" android:text="Max" /> </GridLayout>
31. • Normalmente utilizado para ocupar uma determinada área do ecrã • Filhos posicionados através da gravidade • Tipicamente utilizado para colocar os Fragments FrameLayout
32. FrameLayout <FrameLayout ...> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Bobi" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:text="Rex" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="center|bottom" android:text="Luna" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="top|end" android:text="Max" /> </FrameLayout>
33. • Permite criar layouts grandes e complexos, com uma hierarquia plana • Relações entre os filhos e o pai definem as posições • Muito parecido com o RelativeLayout, mas com melhor performance ConstraintLayout
34. ConstraintLayout <androidx.constraintlayout.widget.ConstraintLayout ...> <Button android:id="@+id/bobi" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Bobi" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:text="Rex" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" /> ...
35. ConstraintLayout ... <Button android:id="@+id/luna" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Luna" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Max" app:layout_constraintBottom_toTopOf="@+id/luna" app:layout_constraintEnd_toStartOf="@+id/luna" /> </androidx.constraintlayout.widget.ConstraintLayout>
36. Resolução
37. Resolução medium resolution (mdpi) HTC Wildfire S high resolution (hdpi) Samsung Galaxy S2 extra extra extra high resolution (xxxhdpi) Pixel 5
38. Resolução medium resolution (mdpi) HTC Wildfire S high resolution (hdpi) Samsung Galaxy S2 extra extra extra high resolution (xxxhdpi) Pixel 5
39. Resolução medium resolution (mdpi) HTC Wildfire S high resolution (hdpi) Samsung Galaxy S2 extra extra extra high resolution (xxxhdpi) Pixel 5 2x2 pixels
40. Resolução medium resolution (mdpi) HTC Wildfire S high resolution (hdpi) Samsung Galaxy S2 extra extra extra high resolution (xxxhdpi) Pixel 5 2x2 dp’s
41. • DP vem de density-independent pixel ◦ Este valor é calculado pelo sistema consoante a resolução do vosso telemóvel ◦ Devem utilizar sempre dp e não px (pixel) ◦ Se usarem px vão ter diferentes comportamentos em telemóveis com diferentes resoluções Resolução dp’s
42. • SP vem de scale-independent pixel ◦ Semelhante ao dp ◦ Tem em consideração o tamanho da fonte escolhida pelo utilizador ◦ Deve ser utilizado em TextView (em vez de dp/px) Resolução sp’s
43. Views
45. • Permite-te adicionar texto TextView
46. TextView <?xml version="1.0" encoding="utf-8"?> <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:text="@string/say_hello"/>
47. TextView <?xml version="1.0" encoding="utf-8"?> <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:text="@string/say_hello"/>
48. TextView <?xml version="1.0" encoding="utf-8"?> <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:text="@string/say_hello" android:textSize="21sp"/> textSize
49. TextView <?xml version="1.0" encoding="utf-8"?> <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:text="@string/say_hello" android:textSize="21sp" android:textStyle="bold"/> textStyle
50. TextView <?xml version="1.0" encoding="utf-8"?> <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:text="@string/say_hello" android:textSize="21sp" android:textStyle="bold"/> android:textColor="@color/colorPrimary"/> textColor
51. ImageView • Permite adicionares uma imagem e/ou cor ao ecrã • Podes fazê-lo a partir: ◦ android:src ◦ android:background
52. ImageView background <?xml version="1.0" encoding="utf-8"?> <ImageView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/android_logo"/>
53. ImageView <?xml version="1.0" encoding="utf-8"?> <ImageView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:scaleType="fitCenter" android:src="@drawable/android_logo"/> <!-- Default value for android:scaleType is fitCenter --> scaletype
54. ImageView <?xml version="1.0" encoding="utf-8"?> <ImageView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:scaleType="fitCenter" android:src="@drawable/android_logo"/> <!-- Default value for android:scaleType is fitCenter --> scaletype
55. ImageView <?xml version="1.0" encoding="utf-8"?> <ImageView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:scaleType="fitXY" android:src="@drawable/android_logo"/> scaletype
56. ImageView <?xml version="1.0" encoding="utf-8"?> <ImageView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:scaleType="fitEnd" android:src="@drawable/android_logo"/> scaletype
57. ImageView <?xml version="1.0" encoding="utf-8"?> <ImageView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:scaleType="fitStart" android:src="@drawable/android_logo"/> scaletype
58. ImageView <?xml version="1.0" encoding="utf-8"?> <ImageView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:scaleType="centerCrop" android:src="@drawable/android_logo"/> scaletype
59. ImageView <?xml version="1.0" encoding="utf-8"?> <ImageView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:scaleType="fitCenter" android:src="@drawable/android_logo" android:background="@color/colorPrimary"/> src vs background
60. ImageView <?xml version="1.0" encoding="utf-8"?> <ImageView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:scaleType="fitCenter" android:src="@color/colorPrimary" android:background="@drawable/android_logo"/> src vs background
61. • Permite a interacção do utilizador • Despoleta uma acção Button
62. Button <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="25dp" android:text="@string/app_name"/>
63. Drawable <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <solid android:color="@color/colorPrimary" /> <corners android:topRightRadius="25dp" android:topLeftRadius="25dp" android:bottomRightRadius="25dp" android:bottomLeftRadius="25dp"/> </shape> background res/drawable/bg_button.xml ❓
64. Button <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="25dp" android:text="@string/app_name" android:background="@drawable/bg_button"/> background
65. Button <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="25dp" android:text="@string/app_name" android:textColor="@android:color/white" android:background="@drawable/bg_button"/> textColor
66. Button <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:minWidth="125dp" android:layout_marginTop="25dp" android:text="@string/app_name" android:textColor="@android:color/white" android:background="@drawable/bg_button"/> minWidth
67. • Permite o utilizador definir um texto específico EditText
68. EditText <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="25dp"/>
69. EditText <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="25dp" android:hint="@string/hint_username"/> hint
70. EditText <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="25dp" android:hint="@string/hint_username"/> hint
71. EditText <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="25dp" android:hint="@string/hint_username" android:inputType="number"/> inputType
72. • Permite o utilizador ativar/desativar uma opção Checkbox
73. Checkbox <CheckBox android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="end" android:text="@string/action_save_credentials"/>
76. Interação
77. • Clique (clickListener) • Clique longo (longClickListener) • Tocar/deslizar (touchListener) • Voltar para trás (back) Interação
78. Clique class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val bobiButton = findViewById<Button>(R.id.bobi) bobiButton.setOnClickListener { Toast.makeText(this, "Bobi", Toast.LENGTH_SHORT).show() } } }
79. Clique longo class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val bobiButton = findViewById<Button>(R.id.bobi) bobiButton.setOnLongClickListener { Toast.makeText(this, "Bobi Longo", Toast.LENGTH_SHORT) .show() true } } }
80. Tocar/deslizar class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val root = findViewById<View>(android.R.id.content) root.setOnTouchListener { view, motionEvent -> Toast.makeText(this, "x:${motionEvent.x} y:${motionEvent.y}", Toast.LENGTH_SHORT).show() true } } }
81. Voltar para trás class MainActivity : AppCompatActivity() { override fun onBackPressed() { Toast.makeText(this, "Bobi", Toast.LENGTH_SHORT).show() } }
82. Voltar para trás class MainActivity : AppCompatActivity() { ... override fun onBackPressed() { showDialog() } }
83. Voltar para trás class MainActivity : AppCompatActivity() { ... override fun onBackPressed() { showDialog() } }
84. Passaporte para a Google
86. Decompondo uma aplicação
87. Instagram Status bar Navigation bar
88. Instagram Action bar Custom layout Custom layout Custom layout BottomNavigationView LinearLayout • RecyclerView • TextView • ImageView
89. Instagram Action bar EditText RecyclerView Custom layout
90. e… o código?
91. Trabalho Para Casa ‍‍
92. Trabalho para casa • Implementar a página inicial do Instagram ◦ ActionBar ◦ Histórias ◦ Feed ◦ BottomNavigationView
93. DogsO’gram • Implementar a página inicial do Instagram ◦ ActionBar ◦ Histórias ◦ Feed ◦ BottomNavigationView
94. DogsO’gram
95. DogsO’gram <?xml version="1.0" encoding="utf-8"?> <menu xmlns:tools="http://schemas.android.com/tools" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:android="http://schemas.android.com/apk/res/android" > <item android:id="@+id/action_photo" android:orderInCategory="100" android:icon="@drawable/ic_camera" android:title="@string/action_camera" app:showAsAction="always" tools:ignore="AlwaysShowAction"/> <item android:id="@+id/action_live" android:orderInCategory="100" android:icon="@drawable/ic_live" android:title="@string/action_live" app:showAsAction="always" tools:ignore="AlwaysShowAction" /> //.. res/menu/menu_action.xml action bar
96. DogsO’gram override fun onCreateOptionsMenu(menu: Menu?): Boolean { val inflater = menuInflater inflater.inflate(R.menu.menu_action, menu) return true } MainActivity.kt action bar
97. DogsO’gram <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="8dp" android:orientation="horizontal"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1" android:text="@string/stories"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="0" android:text="@string/watch_all" android:textSize="15sp" android:fontFamily="sans-serif" app:drawableLeftCompat="@drawable/ic_play" /> </LinearLayout> res/layout/activity_main.xml histórias
98. DogsO’gram <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_margin="8dp" android:orientation="vertical" > //.. </LinearLayout> res/layout/item_story.xml histórias
99. DogsO’gram <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_margin="8dp" android:orientation="vertical" > <ImageView android:id="@+id/iv_user_image" android:layout_width="75dp" android:layout_height="75dp" android:contentDescription="@string/description_user_story" android:scaleType="centerCrop" android:background="@drawable/circle" android:src="@drawable/alan_king_unsplash"/> <TextView android:id="@+id/tv_user_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:text="@string/app_name" android:textSize="15sp" android:textStyle="bold" android:fontFamily="sans-serif"/> </LinearLayout> res/layout/item_story.xml histórias
100. DogsO’gram <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> //... <pt.atp.dogsogram.SquareImageView android:id="@+id/iv_image" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="8dp" android:contentDescription="@string/description_feed_photo" android:scaleType="centerCrop" android:src="@drawable/alan_king_unsplash"/> </LinearLayout> res/layout/item_feed.xml feed
101. DogsO’gram class SquareImageView @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0) : AppCompatImageView(context, attrs, defStyleAttr){ override fun onMeasure(width: Int, height: Int) = super.onMeasure(width, width) } SquareImageView.kt criar a tua implementação de um componente
102. DogsO’gram <com.google.android.material.bottomnavigation.BottomNavigationView android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:background="?android:attr/windowBackground" app:menu="@menu/menu_navigation" /> res/layout/main_activity.xml BottomNavigationView
103. DogsO’gram <?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/nav_home" android:icon="@drawable/ic_home" android:title="@string/navigation_home" /> <item android:id="@+id/nav_search" android:icon="@drawable/ic_search" android:title="@string/navigation_search" /> <item android:id="@+id/nav_more" android:icon="@drawable/ic_more" android:title="@string/navigation_more" /> //... </menu> res/menu/menu_navigation.xml BottomNavigationView
104. kahoot
105. Abre o Android Studio e vamos começar a programar ‍‍
106. VS Ronda 3
107. class Dog { companion object { fun newDog(name: String){ return Dog(name) } } } public class Dog { static Dog newDog(String name){ return new Dog(name); } ... } Métodos estáticos
108. class Dog { companion object { const val TAG = “Dog” } } public class Dog { public static final String TAG = "Dog"; } Static
109. val dog = Dog() dog.apply { name = "Bobi" legs = 5 color = "Amarelo às pintinhas" weight = 30 } Dog dog = new Dog(); dog.name = "Bobi"; dog.legs = 5; dog.color = "Amarelo às pintinhas" dog.weight = 30 apply
110. fun petDog(dog: Dog, after: (Dog)-> Unit ){ println("Festas no $dog") after(dog) } val bobi = Dog("Bobi") petDog(bobi, { dog -> println("E depois $dog") }) // Festas no Dog(name=Bobi) // E depois Dog(name=Bobi) Funções como parâmetro
111. lateinit var dog : Dog println(dog.name) // dog = Dog("bobi") println(dog.name) // ✅ lateinit
112. Sexta-Feira negra Photo by Xiaolong Wong on Unsplash
113. TextView <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/say_hello" android:textSize="21sp" android:textStyle="bold" android:textColor="@color/colorPrimary" app:drawableLeftCompat="@drawable/ic_favorite"/> </LinearLayout>
114. TextView <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/say_hello" android:textSize="21sp" android:textStyle="bold" android:textColor="@color/colorPrimary" app:drawableLeftCompat="@drawable/ic_favorite"/> </LinearLayout>
115. TextView <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/say_hello" android:textSize="21sp" android:textStyle="bold" android:textColor="@color/colorPrimary" app:drawableLeftCompat="@drawable/ic_favorite" app:drawableRightCompat="@drawable/ic_favorite" app:drawableTopCompat="@drawable/ic_favorite" app:drawableBottomCompat="@drawable/ic_favorite"/> </LinearLayout>
116. Limites dos layouts Para ativar: 1. Definições 2. Sistema 3. Opções de programador 4. Mostrar limites do esquema
117. imeOptions actionDone <androidx.constraintlayout.widget.ConstraintLayout ...> <EditText android:id="@+id/bobi" android:layout_width="200dp" android:layout_height="wrap_content" android:backgroundTint="@color/red" android:inputType="text" android:imeOptions="actionDone" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> </androidx.constraintlayout.widget.ConstraintLayout>
118. imeOptions actionSearch <androidx.constraintlayout.widget.ConstraintLayout ...> <EditText android:id="@+id/bobi" android:layout_width="200dp" android:layout_height="wrap_content" android:backgroundTint="@color/red" android:inputType="text" android:imeOptions="actionSearch" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> </androidx.constraintlayout.widget.ConstraintLayout>
119. imeOptions actionGo <androidx.constraintlayout.widget.ConstraintLayout ...> <EditText android:id="@+id/bobi" android:layout_width="200dp" android:layout_height="wrap_content" android:backgroundTint="@color/red" android:inputType="text" android:imeOptions="actionGo" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> </androidx.constraintlayout.widget.ConstraintLayout>
120. imeOptions actionNext <androidx.constraintlayout.widget.ConstraintLayout ...> <EditText android:id="@+id/bobi" android:layout_width="200dp" android:layout_height="wrap_content" android:backgroundTint="@color/red" android:inputType="text" android:imeOptions="actionNext" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> </androidx.constraintlayout.widget.ConstraintLayout>
121. imeOptions actionPrevious <androidx.constraintlayout.widget.ConstraintLayout ...> <EditText android:id="@+id/bobi" android:layout_width="200dp" android:layout_height="wrap_content" android:backgroundTint="@color/red" android:inputType="text" android:imeOptions="actionPrevious" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> </androidx.constraintlayout.widget.ConstraintLayout>
122. Trabalho Para Casa ‍‍
123. Trabalho para casa • Ao carregar no botão de ação do teclado ◦ Validar se as credenciais estão corretas ◦ Navegar para o ecrã principal ◦ Terminar a LoginActivity
124. Trabalho para casa • Mensagem de boas vindas no ecrã principal ◦ Com o nome de utilizador introduzido
125. Trabalho para casa • O utilizador consegue ver toda a informação no ecrã ◦ Desliza o dedo sobre o ecrã ◦ O resto do conteúdo passa a ser visível
126. Dúvidas?
127. Continuamos a responder no discord
128. Obrigado ‍♀
129. Android Training Program PORTUGAL Aula #4 Fundações III Próxima aula: 11 de Novembro