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As one might expect, the query() method is where your content provider gets details on a query some activity wants to perform. It is up to you to actually process said query. The query method gets the following as parameters: A Uri representing the collection or instance being queried A String[] representing the list of properties that should be returned A String representing what amounts to a SQL WHERE clause, constraining which instances should be considered for the query results A String[] representing values to pour into the WHERE clause, replacing any found there A String representing what amounts to a SQL ORDER BY clause You are responsible for interpreting these parameters however they make sense and returning a Cursor that can be used to iterate over and access the data. As you can imagine, these parameters are aimed toward people using a SQLite database for storage. You are welcome to ignore some of these parameters (e.g., you can elect not to try to roll your own SQL WHERE-clause parser), but you need to document that fact so activities attempt to query you only by instance Uri and not using parameters you elect not to handle. For SQLite-backed storage providers, however, the query() method implementation should be largely boilerplate. Use a SQLiteQueryBuilder to convert the various parameters into a single SQL statement, then use query() on the builder to actually invoke the query and give you a Cursor back. The Cursor is what your query() method then returns. For example, here is query() from Provider: @Override public Cursor query(Uri url, String[] projection, String selection, String[] selectionArgs, String sort) { SQLiteQueryBuilder qb=new SQLiteQueryBuilder(); qb.setTables(getTableName());

No databases are automatically supplied to you by Android. If you want to use SQLite, you will need to create your own database, and then populate it with your own tables, indexes, and data. To create and open a database, your best option is to craft a subclass of SQLiteOpenHelper. This class wraps up the logic to create and upgrade a database, per your specifications, as needed by your application. Your subclass of SQLiteOpenHelper will need three methods:

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7. To proceed, you will now address how the PayPal APIs will be populated with the products the customer is wanting to buy. In a similar fashion, this information will be populated, but as you will be able to see, you need to loop through all the products that were originally added to the shopping cart when the customer decided to check out and finalize. The following is the code: PaymentDetailsItemType[ ] itemArray = new PaymentDetailsItemType[ paypalinformation.Order.OrderDetails.Products.Length ]; PaymentDetailsItemType items = null; // Loop through all items that were added to the shopping cart. for ( int i = 0 ; i < paypalinformation.Order.OrderDetails.Products. Length ; i++ ) { items = new PaymentDetailsItemType(); items.Amount = new BasicAmountType(); items.Amount.Value = paypalinformation.Order.OrderDetails. Products[i].Price.ToString(); items.Amount.currencyID = CurrencyCodeType.USD; items.Quantity = paypalinformation.Order.OrderDetails.Products[i]. Quantity.ToString(); items.Name = paypalinformation.Order.OrderDetails.Products[i].Name; items.Number = paypalinformation.Order.OrderDetails.Products[i]. ProductID.ToString(); itemArray.SetValue( items , i ); } // set payment Details DoDirectPmtReqType.DoDirectPaymentRequestDetails.PaymentDetails = new PaymentDetailsType(); DoDirectPmtReqType.DoDirectPaymentRequestDetails.PaymentDetails. Custom = System.DateTime.Now.ToLongTimeString(); DoDirectPmtReqType.DoDirectPaymentRequestDetails.PaymentDetails. OrderDescription = ""; DoDirectPmtReqType.DoDirectPaymentRequestDetails.PaymentDetails. PaymentDetailsItem = new PaymentDetailsItemType[ itemArray.Length ]; DoDirectPmtReqType.DoDirectPaymentRequestDetails.PaymentDetails. PaymentDetailsItem = itemArray; for ( int ii = 0 ; ii < itemArray.Length ; ii++ ) { DoDirectPmtReqType.DoDirectPaymentRequestDetails.PaymentDetails. PaymentDetailsItem.SetValue( itemArray[ ii ] , ii ); }

developing the system. This phase includes designing the objects that will be utilized, designing the database schema, and setting up and organizing the Visual Studio 2005 solution.

The constructor, chaining upward to the SQLiteOpenHelper constructor. This takes the Context (e.g., an Activity), the name of the database, an optional cursor factory (typically, just pass null), and an integer representing the version of the database schema you are using. onCreate(), which passes you a SQLiteDatabase object that you need to populate with tables and initial data, as appropriate. onUpgrade(), which passes you a SQLiteDatabase object and the old and new version numbers, so you can figure out how best to convert the database from the old schema to the new one. The simplest, albeit least friendly, approach is to drop the old tables and create new ones. For example, here is a DatabaseHelper class from Database/Constants that, in onCreate(), creates a table and adds a number of rows, and in onUpgrade() cheats by dropping the existing table and executing onCreate():

if (isCollectionUri(url)) { qb.setProjectionMap(getDefaultProjection()); } else { qb.appendWhere(getIdColumnName()+"="+url.getPathSegments().get(1)); } String orderBy; if (TextUtils.isEmpty(sort)) { orderBy=getDefaultSortOrder(); } else { orderBy=sort; } Cursor c=qb.query(db, projection, selection, selectionArgs, null, null, orderBy); c.setNotificationUri(getContext().getContentResolver(), url); return c; } We create a SQLiteQueryBuilder and pour the query details into the builder. Note that the query could be based on either a collection or an instance Uri in the latter case, we need to add the instance ID to the query. When done, we use the query() method on the builder to get a Cursor for the results.

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