android app development 20150528

Android App Development 5

28 May, 2015

Add a New Button LinearLayout (vertical)

Starting Another Activity Create the Second Activity goNextActivity() Method

Build an Intent Add a startActivity Method

Last Workshop

Adding an Image Adding Audio

Today’s Contents

Step 1 : Preparing an Image fileStep 2 : Adding <ImageView>

Adding an Image

Supported Image Formats BMP / JPG / PNG / GIF

Image Folder Put your image file into folder

res/drawable

Step 1 : Preparing an Image file

Adding an Image

image01.jpg (300 x 255)

Edit res/layout/activity_my.xml Add <ImageView> element

Step 2 : Adding <ImageView>

Adding an Image

res/drawable folder file extension can be omitted

Adding an Image

Adding Audio

SoundPool an Android library

specifically targeted for playing short audio clips

Supported Audio Formats wav / ogg

Adding Audio

sound01.wav

MediaPlayer for longer sound files or streams

Step 1 : Preparing an Audio fileStep 2 : Declaring VariablesStep 3 : Loading an Audio fileStep 4 : Playing an Audio fileStep 5 : Releasing SoundPool resources

Adding Audio

Add raw folder under res folder

Put your audio file into folder res/raw

Step 1 : Preparing an Audio file

Adding Audio

Edit MyActivity.java Declare 2 Variables in MyActivity class

Step 2 : Declaring VariablesAdding Audio

…

}

*To use SoundPool, import SoundPool class

Edit MyActivity.java Add onResume() method to MyActivity

class

Step 3 : Loading an Audio file

Adding Audio

res/raw folderfile extension can be omitted

system calls this method when the activity comes to the foreground

Edit MyActivity.java Add playAudio() method to MyActivity class

Edit res/layout/activity_my.xml Add onClick attribute to ImageView element

Step 4 : Playing an Audio fileAdding Audio

Edit MyActivity.java Add onPause() method to MyActivity

class

Step 5 : Releasing SoundPool resources

Adding Audio

system calls this method when another activity is started

Adding Audio

Wrap Up for Today

Adding an Image ImageView element

Adding Audio SoundPool

Follow the link and read the articles Android Activity Lifecycle

http://www.codelearn.org/android-tutorial/android-activity

Assignment

fin.

2 more workshops left.