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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.

FIGURE 3-4

Figure 1-8

< 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"

Although browsers generally ignore whitespace, if the text is displayed using the <pre> tag or placed in a form element such as a <textarea> (as used in Figure 3-4) then all the whitespace will be apparent

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>

again, place it on a flat surface, and solder the three pins of the stereo jack to the board Because the adapter is going to be inserted into a breadboard, it s a good idea to snip the protruding pins of the jack as short as possible and file them smooth (again, refer to Figure 1-7)

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:

This plug-in takes a string variable containing any text and removes all the whitespace It requires a single argument:

rating = (TextView) findViewById(R.id.rating_detail)

The plug-in makes use of the regular expression feature built into PHP What it does is search for the text within the two forward slash characters ,/, and then replaces any it finds with a single space Between the slashes is the simple string \s+, which means find any section of whitespace that is one or more characters in length The \s stands for a whitespace character

In order to understand the details of constructing the USBS-PA3X2 adapter, I think it will be helpful to have a clear idea of how it will be used in our breadboard circuit Figure 7-3 shows a close-up