visual basic print barcode label Drawing with XML in Java

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Drawing with XML
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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.
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Listing 9.2 simplerectangle.xml
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< xml version="1.0" encoding="utf-8" > <shape xmlns:android="http://schemas.android.com/apk/res/android"> <solid android:color="#FF0000FF"/> </shape>
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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.
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Drawing graphics in Android
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Listing 9.3
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xmllayout.xml
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< 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>
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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.
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Listing 9.4 XMLDraw.java
public class XMLDraw extends Activity { @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.xmldrawable); } }
If you run this code, it ll draw a simple rectangle. You can make more complex drawings or shapes by stacking or ordering your XML drawables, and you can include as many shapes as you want or need, depending on space. Let s explore what multiple shapes might look like next.
Exploring XML drawable shapes
One way to draw multiple shapes with XML is to create multiple XML files that represent different shapes. A simple way to do this is to change your xmldrawable.xml file to look like the following listing, which adds a number of shapes and stacks them vertically.
Listing 9.5 xmldrawable.xml
< 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"
Graphics and animation
android:layout_height="50dip" android:src="@drawable/shape_1" /> <ImageView android:layout_width="fill_parent" android:layout_height="wrap_content" android:src="@drawable/line" /> <ImageView android:layout_width="fill_parent" android:layout_height="50dip" android:src="@drawable/shape_2" /> <ImageView android:layout_width="fill_parent" android:layout_height="50dip" android:src="@drawable/shape_3" /> </LinearLayout> </ScrollView>
Finally, you need to add the shapes shown in listings 9.6 through 9.9 into the res/ drawable folder.
Listing 9.6 Shape1.xml
< xml version="1.0" encoding="utf-8" > <shape xmlns:android="http://schemas.android.com/apk/res/android" type="oval" > <solid android:color="#00000000"/> <padding android:left="10sp" android:top="4sp" android:right="10sp" android:bottom="4sp" /> <stroke android:width="1dp" android:color="#FFFFFFFF"/> </shape>
In the previous listing, we re using an oval. We ve added a tag called padding, which allows us to define padding or space between the object and other objects in the UI. We re also using the tag called stroke, which allows us to define the style of the line that makes up the border of the oval (see the following listing).
Listing 9.7 Shape2.xml
< xml version="1.0" encoding="utf-8" > <shape xmlns:android="http://schemas.android.com/apk/res/android"> <solid android:color="#FF0000FF"/> <stroke android:width="4dp" android:color="#FFFFFFFF" android:dashWidth="1dp" android:dashGap="2dp" /> <padding android:left="7dp" android:top="7dp" android:right="7dp" android:bottom="7dp" /> <corners android:radius="4dp" /> </shape>
With this shape, we re generating another rectangle, but this time (the next listing) we introduce the tag corners, which allows us to make rounded corners with the attribute android:radius.
Creating animations with Android s Graphics API
Listing 9.8
Shape3.xml
< xml version="1.0" encoding="utf-8" > <shape xmlns:android="http://schemas.android.com/apk/res/android" type="oval"> <gradient android:startColor="#FFFF0000" android:endColor="#80FF00FF" android:angle="270"/> <padding android:left="7dp" android:top="7dp" android:right="7dp" android:bottom="7dp" /> <corners android:radius="8dp" /> </shape>
In the next listing, we create a shape of the type line with a size tag using the android:height attribute, which allows us to describe the number of pixels used on the vertical to size the line.
Listing 9.9 line.xml
< xml version="1.0" encoding="utf-8" > <shape xmlns:android="http://schemas.android.com/apk/res/android" type="line" > <solid android:color="#FFFFFFFF"/> <stroke android:width="1dp" android:color="#FFFFFFFF" android:dashWidth="1dp" android:dashGap="2dp" /> <padding android:left="1dp" android:top="25dp" android:right="1dp" android:bottom="25dp" /> <size android:height="23dp" /> </shape>
If you run this code, you should see something like figure 9.2. As you can see, drawing with Android is straightforward, and Android provides the ability for developers to programmatically draw anything they need. In the next section, we re going to look at what you can draw with Android s animation capabilities.
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