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Listing 3-20 shows how to retrieve a cursor with a specific list of columns from the People provider, based on the previous example. Listing 3-20. Retrieving a Cursor from a Content Provider // An array specifying which columns to return. string[] projection = new string[] { People._ID, People.NAME, People.NUMBER, }; // Get the base URI for People table in Contacts Content Provider. // ie. content://contacts/people/ Uri mContactsUri = People.CONTENT_URI; // Best way to retrieve a query; returns a managed query. Cursor managedCursor = managedQuery( mContactsUri, projection, //Which columns to return. null, // WHERE clause People.NAME + " ASC"); // Order-by clause. Notice how a projection is merely an array of strings representing column names. So unless you know what these columns are, you ll find it difficult to create a projection. You should look for these column names in the same class that provides the URI, in this case the People class. Let s look at the other column names defined in this class: CUSTOM_RINGTONE DISPLAY_NAME LAST_TIME_CONTACTED NAME NOTES PHOTO_VERSION SEND_TO_VOICE_MAIL STARRED TIMES_CONTACTED You can discover more about each of these columns by looking at the SDK documentation for the android.provider.Contacts.PeopleColumns class, available at this URL: http://code.google.com/android/reference/android/provider/ Contacts.PeopleColumns.html It is also important to note that a database like contacts contains several tables, each of which is represented by a class or an interface to describe its columns and their types. Let s take a look at the package android.providers.Contacts, documented at the following URL: http://code.google.com/android/reference/android/provider/Contacts.html

Sometimes you want to use Ruby from Java I ll describe three different techniques for how to do this: two that are recommended, and one that is not so recommended That part of the chapter will be of most interest to you if you want to create a Java application that uses Ruby as an extension language, or to provide macro/plug-in capabilities It could also be interesting if you want to use Ruby as a scripting language for web pages instead of Java Server Pages (JSP) or Velocity The final part will discuss some gotchas Because the Java integration in JRuby is on the boundary between two different kinds of systems, it also contains most of the things that can go wrong if you don t know all the tricks and interesting things that can happen.

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You will see that this package has the following nested classes or interfaces: ContactMethods Extensions Groups Organizations People Phones Photos Settings Each of these classes represents a table name in the contacts.db database, and each table is responsible for describing its own URI structure. Plus, a corresponding Columns interface is defined for each class to identify the column names, such as PeopleColumns. Let s revisit the cursor that is returned: it contains zero or more records. Column names, order, and type are provider-specific. However, every row returned has a default column called _id representing a unique ID for that row.

Revisiting our case, entering invalid input into one of the fields (age), tabbing out, and entering value into another field (name) will not clear the other message because updates will not be processed in that region: <h:form> <h:outputText value="RichFaces Pub" /> <h:panelGrid columns="2"> <h:outputText value="Age:" /> <h:panelGroup> <h:inputText id="age" value="#{userBean.age}" required="true" validatorMessage="You must be 21 or older to drink" requiredMessage="Age required" size="4"> <f:validateLongRange minimum="21" /> <a4j:support event="onblur" /> </h:inputText>

I ll describe in some detail how the Java integration works, so that you understand the capabilities and limitations inherent in it But enough talking about what we re going to talk about Let s get started..

Before you access a cursor, you should know a few things about an Android cursor: A cursor is a collection of rows. You need to use moveToFirst() because the cursor is positioned before the first row. You need to know the column names. You need to know the column types. All field-access methods are based on column number, so you must convert the column name to a column number first. The cursor is a random cursor (you can move forward and backward, and you can jump). Because the cursor is a random cursor, you can ask it for a row count.

An Android cursor has a number of methods that allow you to navigate through it. Listing 3-21 shows you how to check if a cursor is empty, and how to walk through the cursor row by row when it is not empty. Listing 3-21. Navigating Through a Cursor Using a while Loop if (cur.moveToFirst() == false) { //no rows empty cursor return; } //The cursor is already pointing to the first row //let's access a few columns int nameColumnIndex = cur.getColumnIndex(People.NAME); String name = cur.getString(nameColumnIndex);

<rich:message for="age" /> </h:panelGroup> <h:outputText value="Name:"/> <h:inputText value="#{userBean.name}"/> </h:panelGrid> <h:commandButton action="enterpub" value="Let me in!"></h:commandButton> </h:form> Here s what you get:

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