RadioButtonをButtonに置き換え、同様にreslayoutに新しいbrush.xmlを作成します：
<?xml version=”1.0 encoding=”utf-8″?>
<LinearLayout xmlns:android=”http://..com/apk/res/android”
android:orientation=”vertical”
android:background=”@drawable/white”
android:layout_width=”fill_parent”
android:layout_height=”fill_parent”>
<com.pstreets.graphics2d.GuidebeeGraphics2DView
android:id=”@+id/graphics2dview”
android:layout_weight=”1″
android:layout_width=”fill_parent”
android:layout_height=”wrap_content”/>
<LinearLayout xmlns:android=”http://..com/apk/res/android”
android:layout_width=”wrap_content” android:layout_height=”wrap_content”
android:orientation=”horizontal”
>
<Button android:text=”Pattern”
android:id=”@+id/btnPattern”
android:layout_width=”wrap_content”
android:textColor=”@color/black”
android:checked=”true”
android:layout_height=”wrap_content”>
</Button>
<Button android:text=”Gradients”
android:id=”@+id/btnGradients”
android:layout_width=”wrap_content”
android:textColor=”@color/black”
android:layout_height=”wrap_content”>
</Button>
</LinearLayout>
</LinearLayout>
Brush.javaを修正してください：
1 public class Brushes extends Graphics2DActivity
2 implements OnClickListener {
3
4 private Button btnPattern;
5 private Button btnGradients;
6
7 public void onCreate(Bundle savedInstanceState) {
8 super.onCreate(savedInstanceState);
9 setContentView(R.layout.brush);
10 graphic2dView = (GuidebeeGraphics2DView)
11 findViewById(R.id.graphics2dview);
12 btnPattern = (Button) findViewById(R.id.btnPattern);
13 btnGradients = (Button) findViewById(R.id.btnGradients);
14 btnPattern.setOnClickListener(this);
15 btnGradients.setOnClickListener(this);
16 }
17
18 @Override
19 protected void drawImage() {
20 drawPatterns();
21
22 }
23
24 @Override
25 public void onClick(View view) {
26 if (view == btnPattern) {
27 drawPatterns();
28 } else {
29 drawGradient();
30 }
31 graphic2dView.refreshCanvas();
32
33 }
34
35 private void drawPatterns() {
36 TextureBrush brush1;
37 TextureBrush brush2;
38 TextureBrush brush3;
39
40 AffineTransform matrix1 = new AffineTransform();
41 AffineTransform matrix2 = new AffineTransform();
42 Bitmap bitmap
43 = BitmapFactory.decodeResource(getResources(),
44 R.drawable.brick);
45 int[] rgbData = new int[bitmap.getHeight()
46 * bitmap.getWidth()];
47 bitmap.getPixels(rgbData, 0, bitmap.getWidth(), 0, 0,
48 bitmap.getWidth(), bitmap.getHeight());
49 brush1 = new TextureBrush(rgbData, bitmap.getWidth(),
50 bitmap.getHeight());
51
52 bitmap = BitmapFactory.decodeResource(getResources(),
53 R.drawable.bird);
54 rgbData = new int[bitmap.getHeight() * bitmap.getWidth()];
55 bitmap.getPixels(rgbData, 0, bitmap.getWidth(), 0, 0,
56 bitmap.getWidth(), bitmap.getHeight());
57 brush2 = new TextureBrush(rgbData, bitmap.getWidth(),
58 bitmap.getHeight());
59 brush3 = new TextureBrush(rgbData, bitmap.getWidth(),
60 bitmap.getHeight(), 127);
61 matrix2.translate(50, 50);
62 // Clear the canvas with white color.
63 graphics2D.clear(Color.WHITE);
64 graphics2D.setAffineTransform(matrix1);
65 graphics2D.fillRectangle(brush1,
66 new Rectangle(20, 50, 100, 100));
67 graphics2D.fillOval(brush2, 10, 10, 80, 80);
68 graphics2D.setAffineTransform(matrix2);
69 graphics2D.fillOval(brush3, 10, 10, 80, 80);
70
71 }
72
73 private void drawGradient() {
74 /* The linear gradient color */
75 LinearGradientBrush brush1;
76 /* The radial gradient color */
77 RadialGradientBrush brush2;
78 /* The second radial gradient color */
79 RadialGradientBrush brush3;
80
81 char[] engText = "Brush".toCharArray();
82
83 FontEx font = FontEx.getSystemFont();
84
85 int fontSize = 44;
86 int X = 15;
87 int Y = 50;
88 int[] fractions = new int[] { 13, 242 };
89 Color[] colors = new Color[] { new Color(0xffff6600),
90 new Color(0xffffff66) };
91 brush1 = new LinearGradientBrush(50, 50, 150, 125,
92 fractions, colors,
93 Brush.NO_CYCLE);
94
95 fractions = new int[] { 13, 128, 255 };
96 colors = new Color[] { new Color(0xffff6600),
97 new Color(0xffffff66),
98 new Color(0xffff6600) };
99 brush2 = new RadialGradientBrush(90, 100, 50,
100 fractions, colors);
101
102 fractions = new int[] { 0, 255 };
103 colors = new Color[] { new Color(0xFFFFFF00),
104 new Color(0xFF000000) };
105 brush3 = new RadialGradientBrush(50, 50, 100,
106 fractions, colors);
107 // Clear the canvas with white color.
108 graphics2D.clear(Color.white);
109 graphics2D.fillRectangle(brush1,
110 new Rectangle(10, 75, 120, 80));
111
112 Pen pen = new Pen(brush2, 8);
113 graphics2D.drawOval(pen, 20, 60, 100, 50);
114 graphics2D.setDefaultBrush(brush3);
115 pen = new Pen(brush2, 2);
116 graphics2D.setDefaultPen(pen);
117 graphics2D.drawChars(font, fontSize, engText, 0,
118 engText.length, X, Y);
119 }
120
121 }
RadioButtonとButtonを紹介した後、この時点でAndroidが提供するコントロールの基本的な使い方を理解しているはずです。 コントロールには、onClick()、onLongClick()、onFocusChange()、onKey()、onTouch()、onCreateContextMenu()など、ユーザーに対応したイベントが用意されています。ユーザーイベントを処理する方法はたくさんあります。一つはActivityでOnClickListenerインタフェースを実装したサンプルコード、もう一つはButton対応のイベント処理方法として以下のコードを使用します：
// Create an anonymous implementation of OnClickListenerprivate
OnClickListener mCorkyListener = new OnClickListener() {
public void onClick(View v) {
// do something when the button is clicked
}
};
protected void onCreate(Bundle savedValues) {
...
// Capture our button from layout
Button button = (Button)findViewById(R.id.corky);
// Register the onClick listener with the implementation above
button.setOnClickListener(mCorkyListener);
...
}
