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Android Kicking Camp for Developers Using Java, Comprehensive: A Guide to Creating Your First Android Apps Chapter 11: Dis PowerPoint Presentation

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Android Boot Army camp for Developers Using Java, Comprehensive: A Guide to Creating Your First Android Apps Chapter 11: Dis

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Android Kicking Campsite for Developers Using Java, Comprehensive: A Guide to Creating Your Outset Android Apps Chapter 11: Dis

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1. Android Kick Camp for Developers Using Coffee, Comprehensive: A Guide to Creating Your Get-go Android Apps Chapter 11: Discover! Persistent Information Android Boot Army camp for Developers Using Coffee, 2nd Ed.

2. Objectives In this affiliate, y'all larn to: • Create an Android project using persistent information • Understand different types of persistent information • Sympathize SharedPreferences persistent data • Sympathize internal storage • Understand external storage • Sympathise saving information using a network connection • Understand saving to a database connection Android Kick Camp for Developers Using Coffee, 2nd Ed.

3. Objectives (continued) • Write information using SharedPreferences • Instantiate a SharePreferences object • Write data using getString( ) method • Retrieve data from SharedPreferences • Read data using a putString( ) method • Display an ImageView control using cod Android Kicking Camp for Developers Using Coffee, 2nd Ed.

4. Using Persistent Data (continued) Steps to complete the App: • Add strings to the Cord tabular array. • Add images to the drawable folder. • Design two XML layouts for the first and 2d Activity. • Instantiate the XML controls in the first Activity. • Establish a SharedPreferences object to store the data entered. • Write data to the SharedPreferences object. • Launch a second Activity. • Initialize the XML controls on the second Activeness. • Retrieve the data from the SharedPreferences object. • Determine the condition of the frequent flier using an If structure. • Display the results on the 2nd Action. Android Boot Campsite for Developers Using Coffee, 2d Ed.

5. Using Persistent Data (continued) • Persistent information stores values permanently by placing the data in a file • Tin be stored in five different ways in Android applications Android Kick Camp for Developers Using Java, 2nd Ed.

6. Using Persistent Information (connected) • Shared preferences • Stores private data in key–value pairs • Internal storage • Stores private data in the memory of the device • External storage • Stores data, which can exist available to other apps on shared external storage • SQLite database • Stores structured information in a private database • Network connectedness • Stores data on a Web server Android Kicking Camp for Developers Using Java, 2nd Ed.

7. Using Persistent Data (continued) • Using Shared Preferences • Can salve whatsoever data including user preferences, such as what wallpaper a user has called or individual values entered by the user in an EditText command • Can be used to save any primitive data: Booleans, floats, ints, longs, and strings Android Boot Camp for Developers Using Java, 2nd Ed.

8. Using Persistent Information (connected) • Using Internal Storage • Store the information directly on the device's internal drive • Saved files on the device are available merely to the app that created the files • Be careful - low internal storage space tin drastically touch on the speed of an Android device and battery life. Android Kick Military camp for Developers Using Java, 2nd Ed.

9. Using Persistent Data (continued) • Using External Storage • Shop the information on the device'southward SD (Secure Digital) card • All applications tin read and write files placed on the external storage and the Android smartphone or tablet owner can remove them • To use external storage, the following permissions are necessary in the Android Manifest file: <uses-permission android:proper name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/> Android Kicking Camp for Developers Using Java, 2nd Ed.

10. Using Persistent Information (continued) • Using SQLite Databases • Perfect for a large corporeality of data • Bachelor since the Cupcake i.5 version of Android and occupies a small amount of disk memory • Android apps model data items in tables and columns, with optional relationships betwixt the entities inside the database • The tables tin can be queried using SQL statements Android Boot Camp for Developers Using Java, 2nd Ed.

11. Using Persistent Data (continued) • Using a Network Connection • If connected to the Internet (a 3G/4G or Wi-Fi connection), data can be stored and retrieved on a Web service • If a connectedness is not available, the user cannot relieve or retrieve the persistent information. Android Kicking Camp for Developers Using Java, 2d Ed.

12. Creating XML Layout Files • Calculation images, a String table and two XML layout files Android Boot Military camp for Developers Using Java, second Ed.

13. Creating XML Layout Files (continued) Android Boot Camp for Developers Using Java, 2nd Ed.

14. Creating XML Layout Files (continued) Android Boot Camp for Developers Using Java, 2nd Ed.

15. Creating XML Layout Files (continued) Android Boot Camp for Developers Using Java, second Ed.

16. Creating XML Layout Files (connected) Android Boot Camp for Developers Using Coffee, 2nd Ed.

17. Creating XML Layout Files (continued) • Instantiating the XML Controls Android Boot Military camp for Developers Using Java, 2d Ed.

18. Creating XML Layout Files (connected) Android Boot Army camp for Developers Using Java, 2nd Ed.

19. Creating XML Layout Files (continued) Android Boot Camp for Developers Using Coffee, second Ed.

20. Creating XML Layout Files (continued) • Writing Persistent Data with SharedPreferences • Data is saved to an XML file equally a central–value pair • The key is a string such as "key1" that uniquely identifies the preference • The value is the data represented as a string, int, long, float, or Boolean • Information types supported by the SharedPreferences class: • putString( )—Stores string values • putInt( )—Stores integer values • putLong( )—Stores long values • putFloat( )—Stores bladder values • putBoolean( )—Stores Boolean values Android Boot Camp for Developers Using Java, second Ed.

21. Creating XML Layout Files (continued) Android Boot Camp for Developers Using Java, 2nd Ed.

22. Creating XML Layout Files (continued) Android Boot Camp for Developers Using Java, 2nd Ed.

23. Creating XML Layout Files (continued) • Launching the 2nd Action Android Kick Campsite for Developers Using Java, 2nd Ed.

24. Creating XML Layout Files (connected) Android Kick Camp for Developers Using Java, 2nd Ed.

25. Creating XML Layout Files (continued) Android Kick Camp for Developers Using Java, second Ed.

26. Creating XML Layout Files (continued) • Instantiating the 2d Activity Controls Android Boot Camp for Developers Using Java, 2nd Ed.

27. Creating XML Layout Files (continued) Android Boot Campsite for Developers Using Java, 2nd Ed.

28. Creating XML Layout Files (continued) • Retrieving Preferences • Retrieving Android information is just as piece of cake equally saving it when you lot are working with SharedPreferences • Utilize the appropriate method to retrieve a key's value by name: • getString( )—Retrieves string values • getInt( )—Retrieves integer values • getLong( )—Retrieves long values • getFloat( )—Retrieves float values • getBoolean( )—Retrieves Boolean values Android Boot Camp for Developers Using Java, 2d Ed.

29. Creating XML Layout Files (continued) Android Boot Army camp for Developers Using Coffee, 2nd Ed.

30. Creating XML Layout Files (continued) Android Kick Camp for Developers Using Java, 2nd Ed.

31. Coding an ImageView Control • An ImageView command can brandish an paradigm past assigning a source path (android:src="drawable/filename") in the XML layout file or by dynamically assigning the paradigm within the Java code Android Boot Campsite for Developers Using Java, 2nd Ed.

32. Coding an ImageView Control (continued) Android Boot Camp for Developers Using Java, 2nd Ed.

33. Coding an ImageView Control (continued) Android Kick Army camp for Developers Using Coffee, 2nd Ed.

34. Summary • When data users enter in an Android app is stored in RAM, it is lost when the app or the device stops running • Persistent data, on the other mitt, is stored on the device's drive or other storage medium such as a memory menu or cloud service so that the data can be retrieved later inside the app or after the termination of the program • Persistent information tin can be stored using shared preferences, internal storage, external storage, a SQLite database, or a network connectedness • Use the SharedPreferences object to save any primitive data: Booleans, floats, ints, longs, and strings Android Kicking Army camp for Developers Using Java, 2nd Ed.

35. Summary (connected) • When you salve application data using the SharedPreferences object, the information is saved to an XML file equally a key–value pair • The primal is a cord such as "key1" that uniquely identifies the preference, and the value is the information represented as a string, int, long, float, or Boolean. • You tin use the key–value pairs stored in SharedPreferences in different Activities of your application or in another application • Use a putDataType( ) method to store the information in a SharedPreferences object, and use a getDataType( ) method to retrieve the data. Android Boot Military camp for Developers Using Java, 2nd Ed.

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