Android Data Persistence
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Questions and Answers

What is the main focus of the chapter?

  • Common data structures
  • Permanent data storage (correct)
  • Data retrieval methods
  • Temporary data storage

    • In the context of Android systems, what are the three main methods for data persistence?

  • Temporary data storage, cloud storage, and external memory
  • Session storage, cookies, and local storage
  • Common elements, traditional files, and relational database management system (correct)
  • Database querying, indexing, and caching

    • What are 'Common Elements' in the context of data persistence in Android?

  • Advanced encryption techniques for secure data storage
  • Lightweight mechanism for storing small data parts (correct)
  • Basic data types used for temporary storage
  • Key-value pairs for storing application settings

    • Which feature makes 'Traditional Files' a notable method for data persistence in Android?

    <p>Flexibility in storing various file types</p> Signup and view all the answers

    What role does 'Relational Database Management System' play in data persistence for Android?

    <p>Efficient indexing and data querying</p> Signup and view all the answers

    Why is permanent data storage considered important in application development?

    <p>To ensure future use of data by users</p> Signup and view all the answers

    What is one of the main purposes of using Shared Preferences in Android?

    <p>To save and restore the user's settings and preferences</p> Signup and view all the answers

    What type of data can be stored using Shared Preferences in Android?

    <p>Text strings, integer numbers, floating point numbers, and boolean values</p> Signup and view all the answers

    When is it preferred to use getSharedPreferences() over getPreferences() in Android?

    <p>When there is a need for multiple preference files in the same activity</p> Signup and view all the answers

    What are the options for saving data through Shared Preferences in Android?

    <p>Using activity preferences and custom preferences</p> Signup and view all the answers

    What is an example of data that can be stored using Shared Preferences in Android?

    <p>User settings such as font size and background color</p> Signup and view all the answers

    Which type of data storage is handled by Shared Preferences in Android?

    <p>Permanent local storage only</p> Signup and view all the answers

    In what format are the data stored by Shared Preferences in Android?

    <p>.xml format</p> Signup and view all the answers

    What kind of functions does the SharedPreferences class provide in Android?

    <p>Functions for reading and writing key-value pairs to the device's storage</p> Signup and view all the answers

    When is it suitable to use Shared Preferences in Android?

    <p>For storing small amounts of user-specific data locally</p> Signup and view all the answers

    What are the main uses of Shared Preferences in Android?

    <p>Saving user settings and application preferences</p> Signup and view all the answers

    Which method should be used when there is a need for multiple preference files in the same activity?

    <p>getSharedPreferences()</p> Signup and view all the answers

    What type of values can be stored using Shared Preferences in Android?

    <p>Text strings, integer numbers, floating point numbers, and boolean values only</p> Signup and view all the answers

    What is the main purpose of SQLite database in Android?

    <p>To store data in a local file on the user's device</p> Signup and view all the answers

    How does SQLite database differ from a traditional database in Android?

    <p>SQLite database is stored locally on the device, while traditional databases are stored on a server</p> Signup and view all the answers

    What kind of operations can be performed on data stored in SQLite database?

    <p>Data can be updated, deleted, and new data can be added</p> Signup and view all the answers

    What distinguishes Shared Preferences from SQLite database in Android?

    <p>SQLite database is suitable for storing complex data structures, while Shared Preferences is used for simple key-value pairs</p> Signup and view all the answers

    Which type of data storage does SQLite database in Android best represent?

    <p>Local file-based data storage</p> Signup and view all the answers

    What is the primary advantage of using SQLite database for data storage in Android applications?

    <p>It provides faster access to data compared to traditional file storage methods</p> Signup and view all the answers

    What is the purpose of the method openOrCreateDatabase in Android's SQLiteDatabase class?

    <p>To create a new database if it doesn't exist, or open it if it does</p> Signup and view all the answers

    Which parameter of the openOrCreateDatabase method specifies that the database can only be accessed by the calling application?

    <p>Context.MODE_PRIVATE</p> Signup and view all the answers

    What does the getColumnNames method in Android's Cursor class return?

    <p>An array of column names for a table</p> Signup and view all the answers

    When is the rawQuery method in Android's SQLiteDatabase class used?

    <p>To perform queries on the database and retrieve a Cursor object with the results</p> Signup and view all the answers

    What is the purpose of the moveToFirst method in Android's Cursor class?

    <p>Moves the cursor to the first row and returns true if there are rows, false otherwise</p> Signup and view all the answers

    What does the getColumnCount method in Android's Cursor class return?

    <p>The total number of columns in the cursor</p> Signup and view all the answers

    In Android's SQLiteDatabase class, what does the rawQuery method return?

    <p>A Cursor object containing the results of the query</p> Signup and view all the answers

    Study Notes

    Data Persistence in Android

    • Data persistence is the ability of an application to store data even when it is closed or restarted.
    • Three main methods for data persistence in Android: Shared Preferences, Traditional Files, and Relational Database Management System (RDBMS).

    Shared Preferences

    • A type of data storage that handles simple data, such as primitive data types and strings.
    • Data is stored in key-value pairs.
    • Suitable for storing small amounts of data, such as user preferences.
    • Stores data in an XML file.
    • Provides functions to store and retrieve data.
    • Main purposes: storing user preferences, saving application state, and storing small amounts of data.
    • Can store boolean, float, int, long, and string values.
    • Use getSharedPreferences() when there is a need for multiple preference files in the same activity.
    • Use getPreferences() when only one preference file is needed.

    Traditional Files

    • A method for storing data in files.
    • Feature: allows for storing large amounts of data.
    • Suitable for storing complex data, such as images and audio files.

    Relational Database Management System (RDBMS)

    • A type of database that stores data in a structured format.
    • Suitable for storing large amounts of complex data.
    • Main purpose: storing and managing large amounts of data.
    • Example: SQLite database.

    SQLite Database

    • A type of RDBMS.
    • Main purpose: storing and managing large amounts of data.
    • Differ from traditional databases: stored locally on the Android device.
    • Operations that can be performed: create, read, update, and delete.
    • Best represents structured data storage.
    • Primary advantage: provides a self-contained and server-less database.
    • The openOrCreateDatabase method is used to create or open a database.
    • The method openOrCreateDatabase has a parameter that specifies the database mode, which can be set to MODE_PRIVATE to allow only the calling application to access the database.
    • The getColumnNames method in the Cursor class returns an array of column names.
    • The rawQuery method is used to execute a SQL query.
    • The moveToFirst method in the Cursor class moves the cursor to the first row.
    • The getColumnCount method in the Cursor class returns the number of columns.
    • The rawQuery method in the SQLiteDatabase class returns a Cursor object.

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    Quiz Team

    Description

    Learn about the important topic of permanently saving data, which is crucial in application development as users expect their data to be available in the future. This quiz covers common preferences, internal storage, external storage, and related concepts.

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