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Drawing a new shape is simple. First, we need to import the necessary packages B, including graphics. Then we import ShapeDrawable, which will support adding shapes to our drawing, and then shapes, which supports several generic shapes, including RectShape, that we ll use. Next, we need to create a view C, and then a new ShapeDrawable to add our Drawable to D. After we have a ShapeDrawable, we can assign shapes to it. In our code, we use the RectShape, but we could ve used OvalShape, PathShape, RectShape, RoundRectShape, or Shape. We then use the onDraw() method to draw the Drawable on the Canvas. Finally, we use the Drawable s setBounds() method to set the boundary (a rectangle) in which we ll draw our rectangle using the draw() method. When you run listing 9.1, you should see a simple Figure 9.1 A simple red rectangle drawn using Android s red rectangle like the one shown in figure 9.1. Graphics API Another way to do the same thing is through XML. Android allows you to define shapes to draw in an XML resource file.

Figure 11-4

With Android, you can create simple drawings using an XML file approach. You might want to use XML for several reasons. One basic reason is because it s simple to do. Also, it s worth keeping in mind that graphics described by XML can be programmatically changed later, so XML provides a simple way to do initial design that isn t necessarily static. To create a drawing with XML, create one or more Drawable objects, which are defined as XML files in your drawable directory, such as res/drawable. The XML you need to create a simple rectangle looks like the code shown in the following listing.

FIGURE 1-20

< xml version="1.0" encoding="utf-8" > <shape xmlns:android="http://schemas.android.com/apk/res/android"> <solid android:color="#FF0000FF"/> </shape>

By default, the document root the place where all your HTML and PHP files should be saved to make them visible to a web browser is /var/www If you find that you cannot edit or save files into it, you will need to modify the folder s permission settings

keypad header on the bottom will greatly simplify the stripboard circuit, as well as the connection to the master processor Testing the Breadboard Circuit When you have assembled your breadboard circuit, we re ready to discuss our first program (keypad1bas), which is presented in Listing 11-1 Its purpose is to determine how closely our realworld ADC values match the theoretical values that were presented back in Figure 11-2 The main program loop repetitively carries out the following tasks:

With Android XML drawable shapes, the default is a rectangle, but you can change the shape by using the type tag and selecting the value oval, rectangle, line, or arc. To use your XML shape, you need to reference it in a layout, as shown in the following listing. The layout resides in res/layout.

$parse $root $p $base Associative array derived from parsing $page String comprising the first part of $page up to and including the host domain name Integer pointer to the final / in $page The current directory where $page is located

< xml version="1.0" encoding="utf-8" > <ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content"> <LinearLayout android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="wrap_content"> <ImageView android:layout_width="fill_parent" android:layout_height="50dip" android:src="@drawable/simplerectangle" /> </LinearLayout> </ScrollView>

Wait until switch is released Send the digits of the value to the terminal window (followed by CR and LF)

.

Now all you need to do is create a simple Activity, where you place your UI in a contentView, as shown in the following listing.

public class XMLDraw extends Activity { @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.xmldrawable); } }

Wait for keypress (theoretically, junk key is pressed, but 5 is safer)