Exam paper for second semester: Mobile Programmin

University of Johannesburg

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1 - 4UNIVERSITY OF JOHANNESBURGFACULTY OF SCIENCEMOBILE PROGRAMMING APK CAMPUSIT00137EXAMINATION2014-11-17EXAMINERSMODERATORM HeydenrychProf R van Olst (WITS)TIME 120 Minutes MARKS 100Please read the following instructions carefully1. Write clearly and legibly in the answer books provided.2. The use of electronic calculators is not permitted3. This paper consists of 4 pagesSTUDENT #STUDENTE #SURNAME, INITIALSVAN, VOORLETTERS2 - 4QUESTION 11.1 Give three reasons why flexibility is an important consideration when choosing amobile programming platform.(3)1.2 Give four advantages of Java for mobile devices. (4)1.3 In the context of J2ME, compare and contrast configurations and profiles. (6)1.4 Give two areas that are not handled by MIDP. (2)[15]QUESTION 22.1 What is the definition of a MIDlet? (1)2.2 What are the five steps of the MIDlet build cycle? (5)2.3 A MIDlet application descriptor has two compulsory elements. What are thesetwo elements?(2)2.4 Complete the following diagram showing the MIDlet lifecycle: (5)[13]QUESTION 33.1 Name and describe the four Android building blocks. (8)3.2 In Android, which class corresponds with the res directory? (1)3.3 Name and describe the two ways in which user interfaces can be made inAndroid.(4)3.4 An inexperienced colleague is producing an Android app with a user interfacewhich is not expected to change often. Recommend one of the methods fromQuestion 3.3 based on this information. Justify your recommendation.(2)3.5 Name the two types of Intent. How may each of these be used? (4)3.6 What must be done to every Activity to ensure correct execution? (1)[20]3 - 4QUESTION 44.1 Distinguish between menus and context menus in Android (4)4.2 In what three ways can colours be defined in Android? (3)4.3 Assume the existence of a Paint object called paint. Provide Java code which willprint “Hello, Android!” clockwise along a circle of radius 200.(5)4.4 What common mistake is made when performing calculations based on the sizeof the screen in Android? How can this mistake be avoided?(3)[15]QUESTION 55.1 If trackball events are not handled, they will automatically be translated into keypress events. Give two situations in which this behaviour would not be desired.(2)5.2 Provide three pieces of advice for ensuring the efficiency of the onDraw(…)function.(3)5.3 Complete the following code for capturing a touch event in Android:@Overridepublic boolean onTouchEvent((a) event) {//We only care about the down actionif (event.(b) != MotionEvent.ACTION_DOWN)//Let our parent handle the eventreturn (c);//Log the x and y positionsLog.d(TAG, "onTouchEvent: x " + (d) + ", y " + (e));//Say that we have handled the event(f);}(6)5.4 Provide Java code to play a video file called ‘exam.mp4’ in Android withoutusing a MediaPlayer.(3)5.5 How would you ensure that the above video plays in full screen? (1)[15]QUESTION 6GeoSync© corporation has commissioned you to produce an Android application for theircompany. This application will be used for an international treasure hunt competition inwhich competitors use their phones in order to find famous landmarks. GeoSync© needs tostore landmark locations in the following format: (DESCRIPTION, LATITUDE, LONGITUDE)where DESCRIPTION is a string and LATITUDE and LONGITUDE are floats.6.1 In order to make a decision about storage, GeoSync© has asked you to providea summary of storage. Name and discuss the three most common forms ofstorage used for persistent state in Android.(6)6.2 Assume the existence of a SQLiteOpenHelper called helper, andappropriate constants named DESCIPTION, LATITUDE, LONGITUDE andTABLE_LANDMARK. Insert the following data into a SQLite database using thishelper: (“Greenwich”, 0.0, 0.0)(5)4 - 46.3 Name and discuss the two types of location sensing available. Based on yourdiscussion, suggest which of these is more appropriate for the GeoSync© app.Fully justify your suggestion.(6)6.4 Given that the distance between users and destinations may be very large, whatformula would you calculate the distance between the user and thedestination?(5)[22]--END--

Mobile Programming

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Mobile Programming

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