#Android studio update content provider android

For performing any database operation, you have to provide the implementation of onCreate() and onUpgrade() methods of SQLiteOpenHelper class. The class is used for database creation and version management. SQLiteOpenHelper class provides the functionality to use the SQLite database. For displaying data on the spinner or listview, move to the next page. Here, we are going to see the example of sqlite to store and fetch the data. So, there is no need to perform any database setup or administration task.

#Android studio update content provider android

used to perform database operations on android devices such as storing, manipulating or retrieving persistent data from the database. This guarantees that we don’t have duplicate data, both locally on the phone as well as on the AWARE Server.SQLite is an open-source relational database i.e. Notice that we assign a paired unique key in the end. We will now prepare the database SQL that is required to create the database (variable TABLES_FIELDS), based on the table database representation Example_Data.

For consistency, we use XXX_Data, where XXX is your plugin name): public static final class Example_Data implements BaseColumns

With this in mind, we will first create a database table representation (extension of BaseColumns of ContentProvider) for use in our ContentProvider. DEVICE_ID: a text column that captures this device’s AWARE Device ID, to uniquely identify who produced this entry.TIMESTAMP: a real column that captures the phone’s current time in milliseconds (System.currentTimeMillis())._id: an integer column that is a primary key, automatically incremented when we insert new data.In SQLite, there are very few database column types: integer (for indexes), text (for strings and long texts), real (precise value), blob (multimedia data – images, sound). When creating a database table, 3 columns are mandatory for the ease of database management, both to Android and AWARE. Now we need to decide what data will this database hold. Public static final int DATABASE_VERSION = 1 Increment every time you modify the database structure Public static String AUTHORITY = '.example' Īnother important constant is the database version number ( DATABASE_VERSION). The database version needs to start with number 1 (set it higher every time you change the database structure).Įvery time you modify your plugin’s ContentProvider structure ( i.e., add a column, change column type), you need to increase the version number (this is how Android knows that the database structure has changed and modifies your ContentProvider database file).

For plugins, we will do the following: “.XXX” where XXX is your plugins name.įor this example, our authority will be: .example, assigned to a constant variable AUTHORITY, like this: /** For the authorities in our core sensors within AWARE, we have all of them as a variant of “” where XXX is the sensor name. The authority is a string that is used to uniquely identify your ContentProvider within Android and it needs to be different from any other ContentProvider that might exist on your device and consequently AWARE’s repository. Because a ContentProvider in AWARE is inherently shared between plugins and other applications, all the variables and methods are public.įirst thing you need to define is the ContentProvider AUTHORITY.