The document provides tutorials for various user interface widgets in Android application development. It includes tutorials for date pickers, time pickers, spinners, buttons, text fields, checkboxes, radio buttons, toggle buttons, and rating bars. Each tutorial section describes how to add the widget to an app layout, populate it with data where applicable, and add click listeners or other logic to handle user interactions with the widget. The tutorials are intended to demonstrate how to correctly implement and use common UI elements in Android apps.
Introduction to Android and Android StudioSuyash Srijan
This is a presentation that I gave at Google Developer Group Oxford to introduce people to Android development and Android Studio IDE, which is used to build Android apps. This presentation gives a brief overview of the platform and fundamentals of the app and what developer tools are available.
PS: Some slides do not have any text accompanying it. That is either because it wasn't relevant or because the text would've been too long to put on the corresponding slide.
Introduction to Android and Android StudioSuyash Srijan
This is a presentation that I gave at Google Developer Group Oxford to introduce people to Android development and Android Studio IDE, which is used to build Android apps. This presentation gives a brief overview of the platform and fundamentals of the app and what developer tools are available.
PS: Some slides do not have any text accompanying it. That is either because it wasn't relevant or because the text would've been too long to put on the corresponding slide.
This set of slides introduces the reader to the concepts of Android Activities and Views. After presenting these two concepts in general terms, it continues with a detailed description of the activity lifecycle. It follows a discussion on how to structure the user interface in terms of View and ViewGroup objects. Finally, the presentation shows how to frame Android application development within the dictates of the Model-View-Controller (MVC) pattern.
This lecture introduces three types of Mobile Applications, differences between the three types, and along the way, discuss the advantages and disadvantages of each type.
References:
https://clevertap.com/blog/types-of-mobile-apps/
https://www.pcloudy.com/types-of-mobile-apps/
An Activity is an application component that provides a screen with which users can interact in order to do something, such as dial the phone, take a photo, send an email, or view a map.
Each activity is given a window in which to draw its user interface. The window typically fills the screen, but may be smaller than the screen and float on top of other windows.
An application usually consists of multiple activities that are loosely bound to each other. Typically, one activity in an application is specified as the "main" activity, which is presented to the user when launching the application for the first time. Each activity can then start another activity in order to perform different actions.
Each time a new activity starts, the previous activity is stopped, but the system preserves the activity in a stack .
When a new activity starts, it is pushed onto the back stack and takes user focus.
Android User Interface Tutorial: DatePicker, TimePicker & SpinnerAhsanul Karim
These slides are for self-learners and trainees of my BASIS and DIIT Android course.
I have used information, content and images from various sources. As these materials are for non-commercial use, I think they won’t infringe any copyright issue.
This set of slides introduces the reader to the concepts of Android Activities and Views. After presenting these two concepts in general terms, it continues with a detailed description of the activity lifecycle. It follows a discussion on how to structure the user interface in terms of View and ViewGroup objects. Finally, the presentation shows how to frame Android application development within the dictates of the Model-View-Controller (MVC) pattern.
This lecture introduces three types of Mobile Applications, differences between the three types, and along the way, discuss the advantages and disadvantages of each type.
References:
https://clevertap.com/blog/types-of-mobile-apps/
https://www.pcloudy.com/types-of-mobile-apps/
An Activity is an application component that provides a screen with which users can interact in order to do something, such as dial the phone, take a photo, send an email, or view a map.
Each activity is given a window in which to draw its user interface. The window typically fills the screen, but may be smaller than the screen and float on top of other windows.
An application usually consists of multiple activities that are loosely bound to each other. Typically, one activity in an application is specified as the "main" activity, which is presented to the user when launching the application for the first time. Each activity can then start another activity in order to perform different actions.
Each time a new activity starts, the previous activity is stopped, but the system preserves the activity in a stack .
When a new activity starts, it is pushed onto the back stack and takes user focus.
Android User Interface Tutorial: DatePicker, TimePicker & SpinnerAhsanul Karim
These slides are for self-learners and trainees of my BASIS and DIIT Android course.
I have used information, content and images from various sources. As these materials are for non-commercial use, I think they won’t infringe any copyright issue.
Microsoft Visual C# 2012- An introduction to object-oriented programmi.docxscroghamtressie
Microsoft Visual C# 2012: An introduction to object-oriented programming Ch.12 Question # 7.
Create a project named Restaurant that contains a Form that allows the user to choose one item from at least three options in each of the following categories - appetizer, entree, and desert. Assign a different price to each selection and display the total when the user clicks a Button . Use the Controls that you think are best for each function. Label items appropriatelyand use fonts and colors to achieve an attractive design.
Solution
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Restuarant
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void groupBox2_Enter(object sender, EventArgs e)
{
}
private void button2_Click(object sender, EventArgs e)
{
double total = 0;
double subtotal = 0;
double tax = 0;
if (comboBox1.SelectedIndex == 0)
{
subtotal = subtotal + 400;
}
if (comboBox1.SelectedIndex == 1)
{
subtotal = subtotal + 50;
}
if (comboBox1.SelectedIndex == 2)
{
subtotal = subtotal + 300;
}
if (comboBox2.SelectedIndex == 0)
{
subtotal = subtotal + 400;
}
if (comboBox2.SelectedIndex == 1)
{
subtotal = subtotal + 50;
}
if (comboBox2.SelectedIndex == 2)
{
subtotal = subtotal + 300;
}
if (comboBox3.SelectedIndex == 0)
{
subtotal = subtotal + 400;
}
if (comboBox3.SelectedIndex == 1)
{
subtotal = subtotal + 50;
}
if (comboBox3.SelectedIndex == 2)
{
subtotal = subtotal + 300;
}
textBox7.Text = Convert.ToString(subtotal);
tax = subtotal * 0.2;
textBox8.Text = Convert.ToString(tax);
total = tax + subtotal;
textBox9.Text = Convert.ToString(total);
}
private void button1_Click(object sender, EventArgs e)
{
}
}
.
The Content helps those who wish to program mobile applications using android platform. The content has been used to conduct mobile application boot camps using android platform on different regions in Tanzania
The action bar is a window feature that identifies the application and user location, and provides user actions and navigation modes. A notification is a message you can display to the user outside of your application's normal UI. When you tell the system to issue a notification, it first appears as an icon in the notification area. In this unit we will discuss about the action bar and notification usage in Android.
A complete Lab Manual with Aim, Procedure, Source Code, ... All the Experiments of Mobile Application Development Lab are developed using Android Studio.
Android Application Development - Level 1Isham Rashik
Very basics of Android Application Development for the beginners who have no prior experience with programming. Can be used for hobby purpose as well as educational material for the academic purpose.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
For more information, visit-www.vavaclasses.com
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
3. USER INTERFACE
Android Widget Toolbox
Date Picker Tutorial
To provide a widget for selecting a date, use the DatePicker widget, which allows
the user to
select the month, day, and year, in a familiar interface.
1. We’ll create a DatePickerDialog, which presents the date picker in a floating
3
dialog box at the press of a button.
2. When the date is set by the user, a TextView will update with the new date.
4. USER INTERFACE
4
Android Widget Toolbox
Date Picker Tutorial (Cont.)
1. Start a new project named HelloDatePicker.
2. Open the res/layout/main.xml file and insert the following:
This creates a basic LinearLayout with a TextView that will display the date and
a Button that will open the DatePickerDialog.
5. USER INTERFACE
5
Android Widget Toolbox
Date Picker Tutorial (Cont.)
3. Open HelloDatePicker.java
4. add the following members to the class
6. USER INTERFACE
6
Android Widget Toolbox
Date Picker Tutorial (Cont.)
5. Now we add following code in onCreate() method to capture View
elements and add listener to the Button.
6. Now we show the dialog in button action
7. USER INTERFACE
7
Android Widget Toolbox
Date Picker Tutorial (Cont.)
1. First, the content is set to the main.xml layout.
2. Then the TextView and Button elements are captured from the layout with
findViewById(int).
3. A new View.OnClickListener is created for the Button, so that when it is clicked,
it will call showDialog(int), passing the unique integer ID for the date picker
dialog.
4. Using showDialog(int) allows the Activity to manage the life-cycle of the dialog
and will call the onCreateDialog(int) callback method to request the Dialog that
should be displayed.
8. USER INTERFACE
8
Android Widget Toolbox
Date Picker Tutorial (Cont.)
5. Now we need to add a DateSetListener which will invoke when user selects a date
9. USER INTERFACE
9
Android Widget Toolbox
Date Picker Tutorial (Cont.)
6. Now we see
10. USER INTERFACE
10
Android Widget Toolbox
Date Picker Tutorial (Cont.)
6. Now we add this method to show the date in display TextView
11. USER INTERFACE
11
Android Widget Toolbox
Date Picker Tutorial (Cont.)
7. We set the selected date in DatePicker and get it from callback
12. USER INTERFACE
12
Android Widget Toolbox
Date Picker Tutorial (Cont.)
8. We add the following code to initiate with current date
13. USER INTERFACE
13
Android Widget Toolbox
Date Picker Tutorial (Cont.)
2. onCreate
14. USER INTERFACE
14
Android Widget Toolbox
Date Picker Tutorial (Cont.)
3. callback method for creating dialog
4. Initialize a new
DatePickerDialog.OnDateSetListen
er
for when the user has set the date
(by clicking the "Set" button)
15. USER INTERFACE
15
Android Widget Toolbox
Date Picker Tutorial (Cont.)
16. USER INTERFACE
Android Widget Toolbox
Time Picker Tutorial
To provide a widget for selecting a date, use the TimePicker widget, which allows
the user to
select the hour and minute in a familiar interface.
1. We’ll create a TimePickerDialog, which presents the date picker in a floating
16
dialog box at the press of a button.
2. When the time is set by the user, a TextView will update with the new time.
Do it yourself
17. USER INTERFACE
17
Android Widget Toolbox
Time Picker Tutorial (Contd.)
Hints:
18. USER INTERFACE
18
Android Widget Toolbox
Spinner Tutorial
Spinner is a widget similar to a drop-down list for selecting items.
1. In this tutorial, you'll create a simple spinner widget that displays a list of planets.
2. When one is selected, a toast message will display the selected item.
19. USER INTERFACE
19
Android Widget Toolbox
Spinner Tutorial (Contd.)
1. Start a new project named HelloSpinner
2. Open the res/layout/main.xml file and insert the following:
Notice that the TextView's android:text attribute and the Spinner's android:prompt attribute
both reference the same string resource. This text behaves as a title for the widget. When
applied to the Spinner, the title text will appear in the selection dialog that appears upon
selecting the widget.
20. USER INTERFACE
20
Android Widget Toolbox
Spinner Tutorial (Contd.)
3. Create a strings.xml file in res/values/ and edit the file to look like this:
The <string> element defines the title string referenced by the TextView and Spinner in
the layout above. The <string-array element defines the list of strings that will be displayed
as the list in the Spinner widget.
21. USER INTERFACE
21
Android Widget Toolbox
Spinner Tutorial (Contd.)
4. Now open the HelloSpinner.java file and insert the following code for
the onCreate() method:
a. After the main.xml layout is set as the content view, the Spinner widget is captured from
the layout with findViewById(int).
b. The createFromResource() method then creates a new ArrayAdapter, which binds each item
in the string array to the initial appearance for the Spinner
c. TheR.array.planets_array ID references the string-array defined above and the
android.R.layout.simple_spinner_item ID references a layout for the standard spinner
appearance, defined by the platform.
22. USER INTERFACE
22
Android Widget Toolbox
Spinner Tutorial (Contd.)
5. Now create a nested class that implements AdapterView.OnItemSelectedListener.
This will provide a callback method that will notify your application when an item has
been selected from the Spinner. Here's what this class should look like
The AdapterView.OnItemSelectedListener requires the onItemSelected() and
onNothingSelected() callback methods.
23. USER INTERFACE
23
Android Widget Toolbox
Spinner Tutorial (Contd.)
6. Now the MyOnItemSelectedListener needs to be applied to the Spinner.
Go back to the onCreate() method and add the following line to the end:
24. USER INTERFACE
24
Android Widget Toolbox
Spinner Tutorial (Contd.)
Run the application
25. USER INTERFACE
Android Widget Toolbox
Form Elements Tutorial
This tutorial introduces a variety of widgets that are useful when creating forms,
25
1. image buttons,
2. text fields,
3. checkboxes,
4. radio buttons,
5. Toggle buttons,
6. Rating bar
26. USER INTERFACE
26
Android Widget Toolbox
Form Elements Tutorial (Contd.)
1. Start a new project named HelloFormStuff.
2. Create a basic LinearLayout in res/layout/main.xml
3. onCreate()
27. USER INTERFACE
We’ll create an image button with 3 states Using the Button widget and an XML file
27
Android Widget Toolbox
Form Elements Tutorial (Contd.)- Custom Button
Normal Focused Pressed
that defines three different images to use
for the different button states. When the
button is pressed, a short message will be
displayed.
1. Copy the images on the right into the res/drawable/ directory of your project. These will
be used for the different button states.
2. Create a new file in the res/drawable/ directory named android_button.xml.
Insert the following XML:
This defines a single drawable resource, which will change its image based on the
current state of the button.
28. USER INTERFACE
28
Android Widget Toolbox
Form Elements Tutorial (Contd.)- Custom Button
3. Open the res/layout/main.xml file and add the Button element:
The android:background attribute specifies the drawable
resource to use for the button background (which, when saved
at res/drawable/android.xml, is referenced as @drawable/android). This replaces the
normal background image used for buttons throughout the system. In order for the
drawable to change its image based on the button state, the image must be applied to
the background
29. USER INTERFACE
Android Widget Toolbox
Form Elements Tutorial (Contd.)- Custom Button
4. o make the button do something when pressed, add the following code at the end of the
onCreate() method:
29
Normal Pressed After Pressed
30. USER INTERFACE
Android Widget Toolbox
Form Elements Tutorial (Contd.)- Edit Text
In this section, you will create a text field for user input, using the EditText widget. Once text
has been entered into the field, the "Enter" key will display the text in a toast message.
1. Open the res/layout/main.xml file and add the EditText element (inside the LinearLayout):
30
2.
31. USER INTERFACE
Android Widget Toolbox
Form Elements Tutorial (Contd.)- Edit Text
2. To do something with the text that the user types, add the following code to the
end of the onCreate() method:
31
32. USER INTERFACE
32
Android Widget Toolbox
Form Elements Tutorial (Contd.)- Edit Text
33. USER INTERFACE
Android Widget Toolbox
Form Elements Tutorial (Contd.)- Check Box
In this section, you will create a checkbox for selecting items, using the CheckBox widget.
When the checkbox is pressed, a toast message will indicate the current state of the checkbox.
1. Open the res/layout/main.xml file and add the CheckBox element (inside the LinearLayout):
33
34. USER INTERFACE
Android Widget Toolbox
Form Elements Tutorial (Contd.)- Check Box
2. To do something when the state is changed, add the following code to the end
of the onCreate() method:
34
35. USER INTERFACE
35
Android Widget Toolbox
Form Elements Tutorial (Contd.)- Check Box
36. USER INTERFACE
Android Widget Toolbox
Form Elements Tutorial (Contd.)- Radio Button
In this section, you will create two mutually-exclusive radio buttons (enabling one disables the
other), using the RadioGroup and RadioButton widgets.
When either radio button is pressed, a toast message will be displayed.
1. Open the res/layout/main.xml file and add two RadioButtons, nested in a RadioGroup
(inside the LinearLayout):
It's important that the RadioButtons are grouped together by the RadioGroup element so
that no more than one can be selected at a time. This logic is automatically handled by the
Android system. When one RadioButton within a group is selected, all others are
automatically deselected
36
37. USER INTERFACE
Android Widget Toolbox
Form Elements Tutorial (Contd.)- Radio Button
2. To do something when each RadioButton is selected, you need
an View.OnClickListener. In this case, you want the listener to be re-usable, so add
the following code to create a new member in the HelloFormStuff Activity
37
3. Now, at the bottom of the onCreate() method, add the following:
38. USER INTERFACE
38
Android Widget Toolbox
Form Elements Tutorial (Contd.)- Radio Button
39. USER INTERFACE
Android Widget Toolbox
Form Elements Tutorial (Contd.)- Toggle Button
In this section, you'll create a button used specifically for toggling between two states, using
the ToggleButton widget. This widget is an excellent alternative to radio buttons if you have
two simple states that are mutually exclusive ("on" and "off", for example).
1. Open the res/layout/main.xml file and add the ToggleButton element (inside the
LinearLayout):
39
40. USER INTERFACE
Android Widget Toolbox
Form Elements Tutorial (Contd.)- Toggle Button
2. To do something when the state is changed, add the following code to the end of the
onCreate() method:
This captures the ToggleButton element from the layout, then adds an View.OnClickListener.
The View.OnClickListener must implement the onClick(View) callback method, which defines
the action to perform when the button is clicked. In this example, the callback method checks
the new state of the button, then shows a Toast message that indicates the current state.
40
41. USER INTERFACE
41
Android Widget Toolbox
Form Elements Tutorial (Contd.)- Toggle Button
42. USER INTERFACE
Android Widget Toolbox
Form Elements Tutorial (Contd.)- Rating Bar
In this section, you'll create a widget that allows the user to provide a rating, with the
RatingBar widget.
1. Open the res/layout/main.xml file and add the RatingBar element (inside the
LinearLayout):
2. To do something when a new rating has been set, add the following code to
42
the end of the onCreate() method:
43. USER INTERFACE
43
Android Widget Toolbox
Form Elements Tutorial (Contd.)- Rating Bar