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Given a base Uri, you can run a query to return data out of the content provider related to that Uri. This has much of the feel of SQL: you specify the columns to return, the constraints to determine which rows to return, a sort order, etc. The difference is that this request is being made of a content provider, not directly of some database (e.g., SQLite). The nexus of this is the managedQuery() method available to your activity. This method takes five parameters: 1. The base Uri of the content provider to query, or the instance Uri of a specific object to query 2. An array of properties of instances from that content provider that you want returned by the query 3. A constraint statement, functioning like a SQL WHERE clause 4. An optional set of parameters to bind into the constraint clause, replacing any s that appear there 5. An optional sort statement, functioning like a SQL ORDER BY clause This method returns a Cursor object, which you can use to retrieve the data returned by the query. Properties is to content providers as columns are to databases. In other words, each instance (row) returned by a query consists of a set of properties (columns), each representing some piece of data. This will hopefully make more sense given an example.

more specifically, allowing you to have multiple websites hosted with one IP address), you can have only one SSL certificate installed and configured.

Given that you have set up the preference XML, you can use a nearly built-in activity for allowing your users to set their preferences. The activity is nearly built-in because you merely need to subclass it and point it to your preference XML, plus hook the activity into the rest of your application. For example, here is the EditPreferences activity of the Prefs/Simple project:

Figure 27-16. The SSL port 4. Moving along, you will be prompted to confirm the configuration information, as shown in Figure 27-17. If the information is to your liking, finalize the wizard by clicking the Next button.

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Our content provider examples come from the ContentProvider/Constants sample application, specifically the ConstantsBrowser class: constantsCursor=managedQuery(Provider.Constants.CONTENT_URI, PROJECTION, null, null, null); In the call to managedQuery(), we provide: The Uri passed into the activity by the caller (CONTENT_URI), in this case representing the collection of physical constants managed by the content provider A list of properties to retrieve (see the following code) Three null values, indicating that we do not need a constraint clause (the Uri represents the instance we need), nor parameters for the constraint, nor a sort order (we should only get one entry back) private static final String[] PROJECTION = new String[] { Provider.Constants._ID, Provider.Constants.TITLE, Provider.Constants.VALUE}; The biggest magic here is the list of properties. The lineup of what properties are possible for a given content provider should be provided by the documentation (or source code) for the content provider itself. In this case, we define logical values on the Provider content provider implementation class that represent the various properties (namely, the unique identifier, the display name or title, and the value of the constant).

package com.commonsware.android.simple; import android.app.Activity; import android.os.Bundle; import android.preference.PreferenceActivity; public class EditPreferences extends PreferenceActivity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); addPreferencesFromResource(R.xml.preferences); } }

Figure 27-17. Confirming the configuration information You have completed the hosting configuration and the SSL certificate installation, so you can now process secure orders.

All that remains is to deploy, or copy, the compiled source code to the production environment. To accomplish this final task, you need to remember back to 26 where you compiled the source code to prepare it for production. If you have made any changes since then, recompile the code.

As you can see, there is not much to see. All you need to do is call addPreferencesFromResource() and specify the XML resource containing your preferences. You will also need to add this as an activity to your AndroidManifest.xml file:

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