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the label s position is already defined (because it appeared first in the XML), the field winds up being too high and has the top of its box clipped off by the container s padding. You may find yourself running into these sorts of problems as you try to get your RelativeLayout to behave the way you want it to. The solution to this conundrum, used in the XML layout shown earlier in this section, is to give the label 15 pixels worth of padding on the top. This pushes the label down far enough that the field will not get clipped. Here are some points of note: You cannot use android:layout_alignParentTop on the field, because you cannot have two properties that both attempt to set the vertical position of the field. In this case, android:layout_alignParentTop conflicts with the later android:layout_alignBaseline = "@id/label" property, and the last one in wins. So, you either have the top aligned properly or the baselines aligned properly, but not both. You cannot define the field first, then put the label to the left of the field, because you cannot forward-reference labeled widgets you must define the widget before you can reference it by its ID. Going back to the example, the OK button is set to be below the field (android:layout_ below = "@id/entry") and have its right side align with the right side of the field (android: layout_alignRight = "@id/entry"). The Cancel button is set to be to the left of the OK button (android:layout_toLeft = "@id/ok") and have its top aligned with the OK button (android: layout_alignTop = "@id/ok"). With no changes to the auto-generated Java code, the emulator gives us the result shown in Figure 7-6.

Building a content provider is probably the most complicated and tedious task in all of Android development. There are many requirements of a content provider, in terms of methods to implement and public data members to supply. And, until you try using your content provider, you have no great way of telling if you did it correctly (versus, say, building an activity and getting validation errors from the resource compiler). That being said, building a content provider is of huge importance if your application wishes to make data available to other applications. If your application is keeping its data solely to itself, you may be able to avoid creating a content provider, and just access the data directly from your activities. But if you want your data to possibly be used by others for example, you are building a feed reader and you want other programs to be able to access the feeds you are downloading and caching then a content provider is right for you. This chapter shows some sample bits of code from the ContentProvider/ConstantsPlus application. This is the same basic application as was first shown back in 22, but rewritten to pull the database logic into a content provider, which is then used by the activity.

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The following script will create the ShoppingCart table: CREATE TABLE [ShoppingCart] ( [ShoppingCartID] [int] IDENTITY(1,1) NOT NULL, [CartGUID] [nvarchar](50) NOT NULL, [Quantity] [int] NOT NULL, [ProductID] [int] NOT NULL, [DateCreated] [smalldatetime] NOT NULL DEFAULT (getdate()), CONSTRAINT [PK_ShoppingCart] PRIMARY KEY CLUSTERED ( [ShoppingCartID] ASC ) )

As discussed in the previous chapter, the content Uri is the linchpin behind accessing data inside a content provider. When using a content provider, all you really need to know is the provider s base Uri. From there, you can run queries as needed, or construct a Uri to a specific instance if you know the instance identifier. However, when building a content provider, you need to know a bit more about the innards of the content Uri.

As mentioned earlier within the chapter, several of the tables will have distinct relationships with each other. At this point, you have created each of the necessary tables along with their respective data types and associated properties. Similar to the methodology earlier explained when creating the tables, you will follow a single exercise to create a single relationship between two tables. You can then use this as a model to follow when creating the other relationships.

If you like HTML tables, spreadsheet grids, and the like, you will like Android s TableLayout it allows you to position your widgets in a grid to your specifications. You control the number of rows and columns, which columns might shrink or stretch to accommodate their contents, and so on. TableLayout works in conjunction with TableRow. TableLayout controls the overall behavior of the container, with the widgets themselves poured into one or more TableRow containers, one per row in the grid.

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