Android setsummary not updating
Preference Activity; public class Advance Preference Example extends Preference Activity implements On Shared Preference Change Listener Implementing on Shared Preference Change Listener helps to capture event that occur when value of any of the Preference is changed via method on Shared Preference Changed.
Android provide various options for data persistence like Preferences, File and Database etc. Columns _id is primary key and autoincrement, while name and garde are text . Database Util is the main class that will used by other activities and will have various method to perform database operations like insert, delete etc. This method can be used for instance like checking read-only before updating database.
Menus are one of the most important parts of any application and when it comes to mobile Menus become more important considering the fact that area available is restricted.
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First create a preference screen with only one preference Edit Text Preference as show below in xml. This method is called from on Shared Preference Changed method and also for on Resume method. Note: this class assumes monotonically increasing version numbers for upgrades.
Let us call this xml as As shown above we are creating Edit Text Preference with key “name“. Reason for calling it from on Resume method is to make sure that summary is processed and updated appropriately even when screen comes up for the 1st time after App as started. We will create table tb_student (DATABASE_TABLE), with 3 columns i.e. Also, there is no concept of a database downgrade; installing a new version of your app which uses a lower version number than a previously-installed version will result in undefined behavior.
For fetching all students from student table we will call fetch All Students of Database Util class. We will check cursor for null and then iterate through it and print name and standard for each student.
Student name is fetched from cursor by calling String(1), here 1 represent the position of column holding the Student Name in the String array passed while querying the database. This post introduces you to the basics of Android SQLite Database with sample code.