David Defour - Université de Perpignan

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JSON-Based Loan Calculator Service • Idea – Make servlet for doing loan calculations • Input: JSON object with amount, period, and interest rate • Output: JSON object with inputs plus monthly payment and total payments • Approach – Server • Read parameter and pass to JSONObject constructor • Extract values with getDouble and getLong • Use same PaymentInfo class as in several previous examples • Turn PaymentInfo into JSON via JSONObject – Client (Android) • Build Map and turn into JSONObject, send to server • Read String, turn into JSONObject • Extract info with getString 662 jeudi 26 janvier 12
Servlet @WebServlet("/loan-calculator") public class LoanCalculator extends HttpServlet { @Override public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String inputString = request.getParameter("loanInputs"); double loanAmount = 200000; double annualInterestRateInPercent = 5.5; long loanPeriodInMonths = 360; try { JSONObject inputValues = new JSONObject(inputString); loanAmount = inputValues.getDouble("amount"); annualInterestRateInPercent = inputValues.getDouble("rate"); loanPeriodInMonths = inputValues.getLong("months"); } catch (Exception e) { // NullPointerException & JSONException // Use default values assigned before the try block } PaymentInfo info = new PaymentInfo(loanAmount, annualInterestRateInPercent, loanPeriodInMonths); PrintWriter out = response.getWriter(); out.println(new JSONObject(info)); } 663 jeudi 26 janvier 12 If you are unfamiliar with servlets, see extensive tutorial series at http://www.coreservlets.com/
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jeudi 26 janvier 12 PROGRAMMATION S
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jeudi 26 janvier 12 DESCRIPTION DU
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DESCRIPTION • Titre : Réalisatio
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jeudi 26 janvier 12 EXAMPLE: APP IN
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jeudi 26 janvier 12 DÉPLACEMENTS O
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GESTION DU CONTRÔLE Ordre Fonction
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RÉFÉRENCES: • http://lwh.free.f
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• Motivations RÉSUMÉ DU COURS
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AVANTAGES DES APPLI WEB • Accès
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AVANTAGES DES APPLI MOBILES • Plu
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INCONVÉNIENTS DES APPS • Pas d
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INSTALLATION • Apps génériques
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OS POUR LE DÉVELOPPEMENT DES APPS
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GOOGLE SEARCH: ANDROID jeudi 26 jan
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jeudi 26 janvier 12 PRÉSENCE SUR L
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jeudi 26 janvier 12 CONCLUSION Pré
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• Web apps vs. Android apps jeudi
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jeudi 26 janvier 12 ANDROID: INSTAL
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jeudi 26 janvier 12 INSTALLATION DE
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INSTALLATION DE JAVA SE 6 • http:
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INSTALLATION D’ECLIPSE • http:/
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ANDROID SDK • Présentation • B
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• Présentation PLUGIN ADT • AD
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CONFIGURATION DE ADT • Définisse
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ANDROID VIRTUAL DEVICES (AVDS) •
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LANCEMENT D’UNE APPS SUR jeudi 26
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LANCEMENT DE HELLOANDROID DANS L’
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jeudi 26 janvier 12 HELLO ANDROID
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DÉFINITION DES OPTIONS DU PROJETS
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LANCEMENT DE VOTRE APPS • Fonctio
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LES BASES DE DDMS • Concepts •
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LANCEMENT D’UNE APPS SUR jeudi 26
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VIA L’USB • Prérequis : il fau
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EXPORTER UN PACKAGE • A faire à
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jeudi 26 janvier 12 LANCEMENT DE L
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RÉSUMÉ • Installation des logic
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CONCEPTS DE BASE DE LA PROGRAMMATIO
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jeudi 26 janvier 12 RÉALISER UN PR
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RÉALISER VOTRE PROPRE PROJET ANDRO
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jeudi 26 janvier 12 DÉFINITION DES
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LANCER UNE NOUVELLE APP SUR UN DEVI
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jeudi 26 janvier 12 STRUCTURE D’U
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LES 3 APPROCHES PRINCIPALES • Jav
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APPROCHE XML: SCHÉMA • Java publ
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jeudi 26 janvier 12 LAYOUT JAVA
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jeudi 26 janvier 12 CODE (CORPS) pu
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RÉSULTAT SUR L’ ÉMULATEUR • c
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jeudi 26 janvier 12 LAYOUT XML
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PLUS DE DÉTAILS • res/layout/mai
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RES/LAYOUT/MAIN.XML jeudi 26 j
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} jeudi 26 janvier 12 CODE (JAVA) p
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jeudi 26 janvier 12 ECLIPSE ADT VIS
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jeudi 26 janvier 12 ECLIPSE VISUAL
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• Approches CONCEPTS • Utilisat
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RES/VALUES/STRINGS.XML Say Hello
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• Dans l’émulateur • Click-D
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jeudi 26 janvier 12 PROJECT LAYOUT
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jeudi 26 janvier 12 QUESTIONS?
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RÉSUMÉ DU COURS • Utilisation d
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CONCEPTS • Buts • Changer la co
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RES/LAYOUT/MAIN.XML jeudi 26 janv
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jeudi 26 janvier 12 MAIN ACTIVITY C
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} jeudi 26 janvier 12 EVENT HANDLER
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jeudi 26 janvier 12 RÉSULTATS SUR
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IDÉE • Buts • Changer la coule
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EVENT HANDLER CLASS (PARTIE DE MAIN
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jeudi 26 janvier 12 RÉSULTAT SUR U
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CONCEPT • Buts • Changer la cou
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RES/VALUES/STRINGS.XML Event Hand
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} } jeudi 26 janvier 12 ACTIVITY CL
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jeudi 26 janvier 12 ACTIVITY CLASS
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jeudi 26 janvier 12 RÉSULTATS SUR
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CONCEPT • Buts • Changer la cou
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jeudi 26 janvier 12 RÉSULTAT SUR L
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jeudi 26 janvier 12 GESTION DES ÉV
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jeudi 26 janvier 12 RÉSULTAT SUR L
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jeudi 26 janvier 12 COPIE D’UN PR
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jeudi 26 janvier 12 CONCLUSION
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APPROCHES: CONTRÔLE SIMPLE • Sit
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• Buttons RÉSUMÉ DU COURS • I
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WIDGET LECTURES COMBINED IN SINGLE
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SWITCHING ACTIVITIES: SUMMARY • S
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jeudi 26 janvier 12 APPROACH FOR BU
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XML: LAYOUT FILE (RES/LAYOUT/BUTTON
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JAVA (BUTTONACTIVITY.JAVA) public c
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BUTTON • Idea • A push button d
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XML: STRINGS FILE ENTRIES (PART OF
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jeudi 26 janvier 12 Emulator RESULT
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IMAGEBUTTON, VARIATION 1 • Idea
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jeudi 26 janvier 12 RESULTS (EMULAT
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IMAGEBUTTON, VARIATION 2 • Idea
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IMAGE DESCRIPTOR FILE (RES/ DRAWABL
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RADIOBUTTON • Idea • A button f
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FIRST EXAMPLE: EVENT HANDLERS ATTAC
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STRINGS FILE AND JAVA • Nothing n
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jeudi 26 janvier 12 RADIOBUTTON (WI
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XML: LAYOUT FILE ENTRY (PART OF RES
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JAVA (RELEVANT PARTS) public class
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JAVA (RELEVANT PARTS, CONTINUED) }
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jeudi 26 janvier 12 CHECKBOX
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TOGGLEBUTTON • Idea • A button
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JAVA (RELEVANT PARTS, CONTINUED) Th
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jeudi 26 janvier 12 WRAP-UP
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jeudi 26 janvier 12 WIDGETS: SPINNE
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jeudi 26 janvier 12 GENERAL APPROAC
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LAYOUT FILES FOR WIDGET LECTURES
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SWITCHING ACTIVITIES: SUMMARY • S
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SWITCHING ACTIVITIES: WIDGETSINITIA
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jeudi 26 janvier 12 OVERALL WIDGET
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SPINNER WITH PREDEFINED • Idea CH
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ONITEMSELECTEDLISTENER • onItemSe
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JAVA (RELEVANT PARTS, CONTINUED) pr
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jeudi 26 janvier 12 SPINNER APPROAC
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SPINNER (CONTINUED) • Key XML att
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JAVA (RELEVANT PARTS) public class
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SUMMARY • Spinner with fixed entr
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Topics in This Section • LinearLa
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Main Layout Strategies • XML-base
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Commonly Used Attributes • Size -
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Commonly Used Attributes (Continued
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LinearLayout • Idea -Put componen
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Example Details 271 jeudi 26 janvie
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Colors • Idea - Although colors c
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Layout File (res/layouts/ nested_la
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Localization Preview • Idea -You
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Setting Locale Programmatically •
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Localized Color File (res/values-qq
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Results 287 jeudi 26 janvier 12 Loc
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Using android:layout_weight • Ide
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Java Code public class LayoutWeight
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jeudi 26 janvier 12 RelativeLayout
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Referring to Existing IDs • First
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jeudi 26 janvier 12 TableLayout ©
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TableRow • Idea - Goes inside Tab
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Hierarchy Viewer • Idea -The Andr
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jeudi 26 janvier 12 Wrap-Up © 2011
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More Reading • Tutorial: Declarin
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jeudi 26 janvier 12 © 2011 Marty H
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jeudi 26 janvier 12 Overview © 201
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Pros and Cons of Following Conventi
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Indentation: blocks that are nested
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Break Things into Small Pieces •
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Use JavaDoc • Use JavaDoc from th
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Use Other Standard Annotations when
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Initialize Local Variables when Dec
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Use TODO Comments for Temporary Cod
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Indent 4 Spaces for Blocks • Inde
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Fully Qualify Imports • List each
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Start JavaDoc Comments with 3 rd Pe
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Start Instance Variables with “m
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Never Ignore Exceptions • Avoid e
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Why Ignoring Exceptions Rule is Too
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Why Generic Exception Rule is (Argu
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Summary • Strictly follow convent
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Topics in This Section • Part I -
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Idea • Android philosophy -Activi
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Summary of Layout 355 jeudi 26 janv
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XML: Layout File: Divider (res/layo
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XML: Colors File (res/values/colors
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Java (LoanCalculatorActivity.java)
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Java (PaymentInfo.java) public clas
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Example: Results 365 jeudi 26 janvi
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Summary • Idea - Specify class na
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Example: Overview • Initial Activ
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XML: Manifest File Template (Androi
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XML: Strings File (res/values/strin
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Summary • Idea - Attach a Bundle
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Option 1: Attaching Entire Bundle t
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XML: Layout File (res/layout/main.x
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Java (IntentFilter1Activity.java) p
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Java (LoanBundler.java, Continued)
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Java (LoanCalculatorActivity, Conti
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More Reading • Tutorial: Intents
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jeudi 26 janvier 12 Intents, Intent
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jeudi 26 janvier 12 Invoking Activi
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Registering to Handle URIs • Matc
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Java (IntentFilter2Activity.java) p
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Summary • Idea - Embed query para
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XML: Manifest File Action Declarati
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Java (IntentFilter2Activity, Contin
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jeudi 26 janvier 12 Intents, Intent
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Using TabActivity: Outline public c
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Option 1: A Single Image • Pros -
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XML Code for Dual-Image Icon
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Example: Overview • Initial Activ
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XML: Manifest File Action Declarati
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Java (TabbedActivity: Tab 2) 443 je
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Summary • Java (extends TabActivi
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Topics in This Section • Localiza
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Big Idea • Good news - Android’
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jeudi 26 janvier 12 Language © 201
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Steps • Make multiple folders wit
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How User Changes Device Language
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Example: The Android Resort • Ide
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Strings File: Spanish (res/values-e
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Manifest File (No Language-Based Ve
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Project Layout 466 jeudi 26 janvier
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Results: Spanish 468 jeudi 26 janvi
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Graphical Layout Editor in Eclipse
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Changing the Language Programmatica
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Idea • Values can be specific to
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Strings File: General Spanish (res/
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Project Layout 480 jeudi 26 janvier
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jeudi 26 janvier 12 Screen Orientat
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Steps • Make two folders: default
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Precedence of Folder Names • Idea
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Layout File: Landscape Mode (res/la
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Dimensions File: Landscape (res/val
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Results: English (Really Non-Spanis
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Results: Mexican Spanish 496 jeudi
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Example: Screen from Widgets Lectur
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jeudi 26 janvier 12 Display Resolut
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Common Approaches • Alternative 1
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Best Practices • For small icons
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More Reading • Developer’s Guid
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jeudi 26 janvier 12 Handling Screen
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Reminder: Preventing Screen Rotatio
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Summary: Saving Data • Override o
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The Bundle Class: Details • Putti
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Loan Payment Comparisons • Idea -
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Core Java Code public class Rotatio
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Core Java Code (Continued) 528 jeud
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Java Code: Saving State 530 jeudi 2
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Java Code: PaymentInfo public class
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Lifecycle Summary onSaveInstanceSta
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More Reading • JavaDoc: Activity
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jeudi 26 janvier 12 Network Program
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jeudi 26 janvier 12 Socket Basics
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Steps for Implementing a Client (Co
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Helper Class: SocketUtils • Idea
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jeudi 26 janvier 12 Example: NIST T
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Manifest File (AndroidManifest.xml)
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Values Files • res/values/strings
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} Main Activity, Continued (NistTim
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jeudi 26 janvier 12 Aside: String F
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Formatted Output: printf • Takes
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Controlling Formatting • Differen
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Printf Example: Controlling Width a
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Parsing Strings Using StringTokeniz
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Interactive Tokenizer: Example impo
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Parsing Strings using the split met
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Interactive Tokenizer: Example publ
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Example Welcome Messages • ftp.mi
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Manifest File (AndroidManifest.xml)
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Main Activity (FtpMessageActivity.j
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} Main Activity, Continued (FtpMess
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HTTP Request/Response: GET • Requ
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Using Telnet to Test Server Command
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Example: Larry Ellison’s Home Pag
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Layout File: Portrait Mode (res/lay
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Values Files • res/values/strings
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Main Activity, Continued (UrlChecke
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Main Activity, Continued (UrlChecke
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Helper Classes • StatusLineParser
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Summary • Basics - Socket socket
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Topics in This Section • Part I (
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Big Idea • Many ways to communica
Page 612 and 613: URL and HttpURLConnection: Overview
Page 614 and 615: Simple URL Methods: Example import
Page 616 and 617: HttpURLConnection: Details • Gett
Page 618 and 619: URL Searcher • Idea -Print out al
Page 620 and 621: Layout File (res/layout/ url_search
Page 622 and 623: Main Activity (UrlSearcher1Activity
Page 624 and 625: Main Activity, Continued (UrlSearch
Page 626 and 627: Main Activity, Continued (UrlSearch
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Page 630 and 631: HttpClient • Idea -A popular clas
Page 632 and 633: HttpClient: Reading Result of POST
Page 634 and 635: HttpUtils 634 jeudi 26 janvier 12 p
Page 636 and 637: jeudi 26 janvier 12 © 2011 Marty H
Page 638 and 639: XML Files • AndroidManifest.xml -
Page 640 and 641: } Main Activity, Continued (UrlSear
Page 642 and 643: jeudi 26 janvier 12 Aside: JSON For
Page 644 and 645: JSON: Example in JavaScript var per
Page 646 and 647: Popular Web Services that Send JSON
Page 648 and 649: JSONObject • Idea -A popular JSON
Page 650 and 651: Extracting Data From a JSONObject
Page 652 and 653: jeudi 26 janvier 12 Using JSONObjec
Page 654 and 655: JSONObject’s Algorithm for JSONif
Page 656 and 657: Bean Properties: Examples Method Na
Page 658 and 659: Drawbacks of JSONification • Send
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Page 666 and 667: Android Activity, Continued 666 jeu
Page 668 and 669: Results 668 jeudi 26 janvier 12 htt
Page 670 and 671: Double Translate App • Idea - The
Page 672 and 673: Main Activity, Continued 672 jeudi
Page 674 and 675: Key Helper Class (TranslationUtils)
Page 676 and 677: Results: Medium-Difficulty Text 676
Page 678 and 679: Results: More Deliberately-Tricky T
Page 680 and 681: More Reading • JavaDoc -HttpURLCo
Page 682 and 683: jeudi 26 janvier 12 Multithreaded P
Page 684 and 685: 684 jeudi 26 janvier 12 Overview ©
Page 686 and 687: Steps for Concurrent Programming
Page 688 and 689: Thread Mechanism One: Separate Runn
Page 690 and 691: Thread Mechanism One: Example publi
Page 692 and 693: Helper Class public class ThreadUti
Page 694 and 695: Pros and Cons of Approach • Advan
Page 696 and 697: Review of Interfaces: Syntax • Sh
Page 698 and 699: Thread Mechanism Two: Main App Impl
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Page 704 and 705: Review of Inner Classes • Class c
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Page 708 and 709: } Thread Mechanism Three: Example (
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Pros and Cons • Separate class th
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Race Conditions • Idea - You writ
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} Race Conditions: Example (Continu
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Race Conditions: Solution? • Do t
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Arbitrating Contention for Shared R
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722 jeudi 26 janvier 12 © 2011 Mar
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Methods in ExecutorService Class
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Lower-Level Threading • Use Threa
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Types of Task Queues • Executors.
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Nasty Synchronization Bug public cl
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Synchronization Solution (Continued
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Other Advanced Topics • wait/wait
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More Reading • Books -Java Concur
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740 jeudi 26 janvier 12 Overview ©
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Nonresponsive GUI Controls • Prob
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jeudi 26 janvier 12 Updating UI Aft
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Example: Multi-URL Validator • Id
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Main Activity: Setup Code (Continue
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Main Activity: Button Handler (Afte
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Main Activity: Helper Methods 752 j
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Results 754 jeudi 26 janvier 12
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Displaying a Network Image • Idea
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Making a View for an Image • Idea
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Example: Unthreaded Image Viewer
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View.post • Scenario -Total wait
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Main Activity: Setup Code public cl
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Main Activity: Runnable Inner Class
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AsyncTask • Scenario - Total wait
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AsyncTask Details: Constructor •
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AsyncTask Details: doPostExecute
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Example: Multithreaded Image Viewer
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More Reading • JavaDoc -AsyncTask
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David Defour - Université de Perpignan

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