This Android program defines a MainActivity class that extends Activity. The program imports necessary Android classes and defines methods for setting the content view on create, inflating the menu, and summing two numbers entered in EditText fields to display the result in a TextView. When the sum button is clicked, it gets the values from the EditText fields, parses them to doubles, calculates the sum, and sets the TextView to display the calculation.
This Android program defines a MainActivity class that extends Activity. The program imports necessary Android classes and defines methods for setting the content view on create, inflating the menu, and summing two numbers entered in EditText fields to display the result in a TextView. When the sum button is clicked, it gets the values from the EditText fields, parses them to doubles, calculates the sum, and sets the TextView to display the calculation.
This document defines a MySqlHelper class that extends SQLiteOpenHelper. It contains constants for table and column names, SQL statements to create three tables (user, preference, hotel), and methods to create the database tables onCreate and drop/recreate them onUpgrade if the database version changes.
This document defines a ContentProvider class called StudentsProvider that manages access to student data stored in a SQLite database. It implements methods like insert, query, delete, update and getType to perform CRUD operations on the student data according to the URI received. The provider uses a UriMatcher to match URI patterns and route requests to the appropriate method.
This class defines a database helper that manages the underlying data repository for an Android content provider. It extends the SQLiteOpenHelper class and overrides required methods to create a database table called "students" with fields for id, name, and grade when the database is created, and to drop and recreate this table if the database version changes.
This Android application allows users to add and retrieve student records from a content provider. It contains activities for adding a new student record by inserting content values into the content provider, and retrieving student records by querying the content provider and displaying the results in toast messages. The application uses content values, URIs and cursors to interface with the content provider to store and retrieve student name and grade data.