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we re also assigning an icon from the android.R.drawable resources namespace. You can qualify resources in this way and reuse the platform drawables: icons, images, borders, backgrounds, and so on. You ll likely want to customize much of your own applications and provide your own drawable resources, which you can do. Note that the platform provides resources if you need them, and they re arguably the better choice in terms of consistency for the user, particularly if you re calling out to well-defined actions as we are here: map, phone call, and web page. We ll cover how all the different resource types are handled and where they re placed in source in the next several sections. The first types of resources we ll look at more closely are layouts and views.
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Defining views and layouts through XML resources
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As we ve noted in several earlier sections, views and layouts are often defined in XML1 rather than in Java code. Defining views and layout as resources in this way makes them easier to work with, decoupled from the code, and in some cases reusable in different contexts. View resource files are placed in the res/layout source directory. The root of these XML files is usually one of the ViewGroup layout subclasses we ve already discussed: RelativeLayout, LinearLayout, FrameLayout, and so on. Within these root elements are child XML elements that comprise the view/layout tree. A subtle but important thing to understand here is that resources in the res/layout directory don t have to be complete layouts. For example, you can define a single TextView in a layout file the same way you might define an entire tree starting from an AbsoluteLayout. Yes, this might make the layout name and path potentially confusing, but that s how it s set up. It might make more sense to have separate res/layout and res/view directories, but that might be confusing too, so keep in mind that res/ layout is useful for more than layout. You might use this approach when a particularly configured View is used in multiple areas of your application. By defining it as a standalone resource, it can be maintained more readily over the lifetime of your project. You can have as many XML layout/view files as you need, all defined in the res/layout directory. Each View is then referenced in code, based on the type and ID. Our layout file for the ReviewDetail screen, review_detail.xml shown in the following listing, is referenced in the Activity code as R.layout.review_detail which is a pointer to the RelativeLayout parent View object in the file.
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Listing 3.7 XML layout resource file for review_detail.xml
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< xml version="1.0" encoding="utf-8" > <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent"
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See http://www.xml.com for more information about XML.
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Using resources
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android:gravity="center_horizontal" android:padding="10px" android.setVerticalScrollBarEnabled="true" > <ImageView android:id="@+id/review_image" android:layout_width="100px" android:layout_height="100px" android:layout_marginLeft="10px" android:layout_marginBottom="5px" /> <TextView android:id="@+id/name_detail" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@id/review_image" android:layout_marginLeft="10px" android:layout_marginBottom="5px" style="@style/intro_blurb" /> <TextView android:id="@+id/rating_label_detail" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/name_detail" android:layout_marginLeft="10px" android:layout_marginBottom="5px" style="@style/label" android:text="@string/rating_label" /> . . . </RelativeLayout>
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Include child element with ID
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Reference another resource
In this file, we re using a RelativeLayout. This is the ViewGroup at the root of the View tree. LayoutParams are then also defined in XML using the android: layout_[attribute] convention, where [attribute] refers to a layout attribute such as width or height. Along with layout, you can also define other View-related attributes in XML with counterpart XML attributes to the methods available in code, such as android:padding, which is analogous to the setPadding() method. After we ve defined the RelativeLayout parent itself, we add the child View elements. Here we re using an ImageView and multiple TextView components. Each of the components is given an ID using the form android:id="@+id/[name]" B. When an ID is established in this manner, an int reference is defined in the resource table and named with the specified name. Other components can reference the ID by the friendly textual name. Never use the integer value directly, as it ll change over time as your view changes. Always use the constant value defined in the R class! After views are defined as resources, you can use the Activity method findViewById()to obtain a reference to a particular View, using the name. Then you can manipulate that View in code. For example, in listing 3.6 we grabbed the rating TextView as follows:
rating = (TextView) findViewById(R.id.rating_detail)
This inflates and hands off the rating_detail element. Note that child views of layout files end up as id type in R.java (they re not R.layout.name; rather they re R.id.name, even though they re required to be placed in the res/layout directory).
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