Lesson 8: Integrating The Image Switcher Into The Application
INTRODUCTION
In this lesson you will
learn more about working with images, editing XML layouts for images and
parameters and creating a new class to support swiping images within the
application. This is a great lesson to review some of the core content you have
learned up to this point and refine your understanding of key concepts such as
creating classes, working with the XML, overrides and the parameters of the
layout of the application. Within this lesson you will also be introduced to
the image switcher and will learn how to integrate it into your application.
LESSON
OBJECTIVES
By the end of this lesson, you will be able to:
Section #1: Working With Images In
Java for Android
1. Summarize the use of images in mobile
applications.
Section #2: Layout Parameters
1. Summarize how to edit the layout parameters in
XML.
Section
#3: Video Demonstration:
LEARNING SEQUENCE
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Required Reading
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Read the following:
·
Section
#1:
·
Section
#2:
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Resources
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View the
following:
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Video Transcripts
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Assignments
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Complete the
following:
·
What are the image file types which Android
supports? What are some of the locations which these files are stored to be
used in a project?
·
Describe some of the properties of an Android
Layout. What is the meaning of the Layout Parameters?
·
List the central
components to getting the image swiper to work. What new skills have you
learned in this lesson in managing this project?
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INSTRUCTION
Section #1: Working With Images In Java for Android
In this
section you will learn how to manage the use of images and graphics within an
Android development project. You will learn how to save image resources in the
appropriate locations in resource folders and display, change and work with
bitmap graphics in Android projects.
Step 1.
This resource shows a list of the basic
types of graphics which can be brought into a Java for Android project. The
list provides an overview of the image types and how they will be attributed in
the XML.
Step 2.
This reading will
provide you with an overview of graphics and images in Android.
The folders in which images can be stored as well as the
supported files which are used with Java for Android are included. This
resource also describes the process of defining images in the XML of the
application. Addition effects are also covered on pages 2 and 3 of this
tutorial. You will review how to change the code to edit an image and also a
basic background on image processing.
Step 3.
This
reading shows you how to view an image in Android and also how to change the
image. You will understand how to edit bitmap images. This reading explains
image attributes, scaling an image and rotating images in Android.
Step 4.
Complete Assignment #1:
Section #2: Layout
Parameters
In this
section you will be provided an overview of the properties of the Layout
Parameters which will support your knowledge of how objects are viewed in the
application. You will learn how setting the layout parameters adds new views
for components of the application.
Step 1.
This reading provides the direct
description of what layout parameters are and why they are important to the
view class in Java for Android. Understanding this basic overview will be
highly beneficial as you move through this lesson and need to define the components
of layout.
Step 2.
Review this presentation that will put
the layout parameters into perspective with your current knowledge of relative
layouts and nesting of components of the layouts and common attributes.
Step 3.
Complete Assignment #2:
Section #3: Video
Demonstration
In the video tutorial for this lesson
you will learn how to integrate the image swiper into the application. You will
create the XML for the layout of the swiper page and create the ImageSwiper
class for the images to swipe. You will also learn where to place the images
into the correct resource folder for them to be linked. At the conclusion of
this video you will better understand the sequence of connecting the activities
to the XML layouts in the application. You will also become more confident
editing the code to begin new activities.
Step 1.
SUMMARY
In this lesson you have been introduced to how
to work with images in Java for Android. You have reviewed information about
how to place and save images in order for your code to work. As you worked with
organizing the creation of files within the project, you also learned how to
adjust the layout parameters of the elements you are adding. The video which corresponds
to this lesson walked you through the process of identifying and applying
skills using images, setting parameters and organizing images within the resource
folders. In the next lesson you will learn how to
export the .apk file which will be added to the Android device for testing.
ASSIGNMENTS
· What are the image
file types which Android supports? What are some of the locations which these
files are stored to be used in a project?
· Describe some of the
properties of an Android Layout. What is the meaning of the Layout Parameters?
· List the central components to getting the image swiper
to work. What new skills have you learned in this lesson in managing this
project?
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