mobileandwirelesssystemsprogrammingridene.youssef.free.fr/courses/android/appfundamentals-android.pdf ·...

IntroductionApplication ComponentsActivating components

Developping apps

Mobile and Wireless Systems Programming

Application Fundamentals

Youssef RIDENE : [email protected] Mobile and Wireless Systems Programming


Developping apps

Java programming languageAndroid package : .apkDalvik VM executes files in the Dalvik Executable (.dex)format1 .apk = 1 application1 application = 1 Linux process1 application = 1 virtual machine



Developping apps

ActivitiesServicesBroadcast receiversContent providers

A visual user interfaceImplemented as a subclass of android.app.ActivityMany activities in the same projectEach activity is independent of the others1 Activity = 1 window



Developping apps


No visual UIRuns in the background for an indefinite period of timeExtends android.app.Service



Developping apps


Receive and react to broadcast announcementsNo visual UIExtends android.content.BroadcastReceiverFor example : announcements that the battery is low, that apicture has been taken, or that the user changed a languagepreference. . .



Developping apps


Makes a specific set of the application’s data available to otherapplicationsData can be stored in the file system, in an SQLite database. . .Extends android.content.ContentProvider



Developping apps

Intent

An abstract description of an operation to be performedCan be caused with :

startActivitybroadcastIntentstartService or bindService



Developping apps

Intent

Intent()Intent(Intent o)Intent(String action)Intent(String action, Uri uri)Intent(Context packageContext, Class< ?> cls)Intent(String action, Uri uri, Context packageContext,Class< ?> cls)

Intent myIntent = new Intent(CurrentActivity.this,NextActivity.class) ;CurrentActivity.this.startActivity(myIntent) ;



Developping apps

Intent

Action :ACTION_VIEWACTION_MAINACTION_EDITACTION_DIAL. . .

Uri :tel :123http ://www.uni-pau.frcontent ://contacts/people/1. . .

Intent viewIntent = new Intent("android.intent.action.VIEW",Uri.parse("http ://www.univ-pau.fr")) ;startActivity(viewIntent) ;



Developping apps

ADTApp structureResourcesThe Manifest fileActivityUser InterfaceUser interaction

Project wizard



Developping apps




Developping apps


Resources



Developping apps


Resources

asset (AssetManager)Instantiate layout elements at runtime

Button myButton = (Button) findViewById(R.id.my_button) ;TextView myTextView = (TextView)findViewById(R.id.my_textView) ;



Developping apps


AndroidManifest.xmlContain all the application components (Activity, Persmissions,SDK version. . . )

<a c t i v i t y> . . .</ a c t i v i t y><s e r v i c e> . . .</ s e r v i c e><r e c e i v e r> . . .</ r e c e i v e r><p r o v i d e r> . . .</ p r o v i d e r>



Developping apps


AndroidManifest.xml

<? xml v e r s i o n=" 1 .0 " encod ing=" ut f−8"?><man i f e s t . . .>

<a p p l i c a t i o n . . .><a c t i v i t y andro id :name="com . uppa .m2 . F i r s t A c t i v i t y "

a n d r o i d : i c o n="@drawable / i c on . png"a n d r o i d : l a b e l=" @ s t r i n g / f i r s t L a b e l ". . .>

</ a c t i v i t y>. . .

</ a p p l i c a t i o n></man i f e s t>



Developping apps


Activity

Android Activity is a equivalent to a MIDP MIDlet but !GUI and User inuptsOne Activity for each screenLifecycle :

void onCreate(Bundle savedInstanceState)void onStart()void onRestart()void onResume()void onPause()void onStop()void onDestroy()



Developping apps


Activity

package com . uppa . h e l l o a n d r o i d ;

import and ro i d . app . A c t i v i t y ;import and ro i d . os . Bundle ;

pub l i c c l a s s He l l oAnd ro i d extends A c t i v i t y {/∗∗ Ca l l e d when the a c t i v i t y i s f i r s t c r e a t e d . ∗/@Over r idepub l i c void onCreate ( Bundle s a v e d I n s t a n c e S t a t e ) {

super . onCreate ( s a v e d I n s t a n c e S t a t e ) ;s e tContentV iew (R . l a y o u t . main ) ;

}}



Developping apps


UI

Declare UI elements in XML (Wysiwyg editor)<? xml v e r s i o n=" 1 .0 " encod ing=" ut f−8"?><L inea rLayou t xm l n s : a nd r o i d=" h t t p : // schemas . and r o i d . com/apk/ r e s / and ro i d "

and r o i d : l a y ou t_w id t h=" f i l l _ p a r e n t "a nd r o i d : l a y o u t_he i g h t=" f i l l _ p a r e n t "a n d r o i d : o r i e n t a t i o n=" v e r t i c a l " >

<TextView a n d r o i d : i d="@+i d /my_textView"and r o i d : l a y ou t_w id t h="wrap_content "a nd r o i d : l a y o u t_he i g h t="wrap_content "a n d r o i d : t e x t="He l l o , ␣ I ␣am␣a␣TextView" />

<Button a n d r o i d : i d="@+i d /my_button"and r o i d : l a y ou t_w id t h="wrap_content "a nd r o i d : l a y o u t_he i g h t="wrap_content "a n d r o i d : t e x t="He l l o , ␣ I ␣am␣a␣Button" />

</ L inea rLayou t>



Developping apps


UI Builder



Developping apps


Components

LayoutsWidgetsDialogMenus



Developping apps


Layout



Developping apps


Widgets



Developping apps


AlertDialog



Developping apps


ProgressDialog



Developping apps


Notification



Developping apps


Toast



Developping apps


User interaction

KeyPadClickListener (onClick(View))KeyListener (onKeyUp(KeyEvent), onKeyDown(KeyEvent))

TouchScreenTouchListener (onTouchEvent(MotionEvent))


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