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这个例子是绘制多边形，多义形和路径，采用单选钮RadioButton来选择Polys 和Path示例:
UI 设计为 上部分用来显示绘图内容，下部分为两个单选按钮 Polys ，Path。这样layout就和main.xml 不一样，main.xml只含一个com.pstreets.graphics2d.GuidebeeGraphics2DView。因此需在 res\layout下新建一个polys.xml：
RadioButton 需包含在RadioGroup中做为一个分组，这里将Polys 设为选中。
定义好Layout资源后，修改 Path.java
private RadioButton radioPoly; private RadioButton radioPath; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.polys); graphic2dView = (GuidebeeGraphics2DView) findViewById(R.id.graphics2dview); radioPath = (RadioButton) findViewById(R.id.radioPath); radioPoly = (RadioButton) findViewById(R.id.radioPolys); radioPath.setOnClickListener(this); radioPoly.setOnClickListener(this); }应为需要处理按键消息，所以定义了两个RadioButton对象，可以通过findViewById获取实例。因为两个RadioButton这里采用 同样的处理方法，可以让Path实现OnClickListener ，即：public class Path extends Graphics2DActivity implements OnClickListener。完整代码如下：
1 public class Path extends Graphics2DActivity 2 implements OnClickListener { 3 4 private RadioButton radioPoly; 5 private RadioButton radioPath; 6 7 public void onCreate(Bundle savedInstanceState) { 8 super.onCreate(savedInstanceState); 9 setContentView(R.layout.polys); 10 graphic2dView 11 = (GuidebeeGraphics2DView) 12 findViewById(R.id.graphics2dview); 13 radioPath = (RadioButton) findViewById(R.id.radioPath); 14 radioPoly = (RadioButton) findViewById(R.id.radioPolys); 15 radioPath.setOnClickListener(this); 16 radioPoly.setOnClickListener(this); 17 } 18 19 @Override 20 protected void drawImage() { 21 if (radioPoly.isChecked()) { 22 drawPolys(); 23 } else { 24 drawPaths(); 25 } 26 graphic2dView.refreshCanvas(); 27 28 } 29 30 @Override 31 public void onClick(View view) { 32 drawImage(); 33 } 34 35 private void drawPaths() { 36 AffineTransform mat1; 37 38 // The path. 39 com.mapdigit.drawing.geometry.Path path; 40 41 // Colors 42 Color redColor = new Color(0x96ff0000, true); 43 Color greenColor = new Color(0xff00ff00); 44 Color blueColor = new Color(0x750000ff, true); 45 46 String pathdata 47 = "M 60 20 Q -40 70 60 120 Q 160 70 60 20 z"; 48 mat1 = new AffineTransform(); 49 mat1.translate(30, 40); 50 mat1.rotate(-30 * Math.PI / 180.0); 51 path = com.mapdigit.drawing.geometry.Path.fromString(pathdata); 52 // Clear the canvas with white color. 53 graphics2D.clear(Color.WHITE); 54 55 graphics2D.setAffineTransform(new AffineTransform()); 56 SolidBrush brush = new SolidBrush(greenColor); 57 graphics2D.fill(brush, path); 58 graphics2D.setAffineTransform(mat1); 59 60 brush = new SolidBrush(blueColor); 61 com.mapdigit.drawing.Pen pen 62 = new com.mapdigit.drawing.Pen(redColor, 5); 63 graphics2D.setPenAndBrush(pen, brush); 64 graphics2D.draw(null, path); 65 graphics2D.fill(null, path); 66 67 } 68 69 private void drawPolys() { 70 AffineTransform mat1; 71 72 // Colors 73 Color redColor = new Color(0x96ff0000, true); 74 Color greenColor = new Color(0xff00ff00); 75 Color blueColor = new Color(0x750000ff, true); 76 77 Polyline polyline; 78 Polygon polygon; 79 Polygon polygon1; 80 81 String pointsdata1 82 = "59,45,95,63,108,105,82,139,39,140,11,107,19,65"; 83 mat1 = new AffineTransform(); 84 mat1.translate(30, 40); 85 mat1.rotate(-30 * Math.PI / 180.0); 86 polyline = new Polyline(); 87 polygon = new Polygon(); 88 polygon1 = new Polygon(); 89 Point[] points = Point.fromString(pointsdata1); 90 for (int i = 0; i < points.length; i++) { 91 polyline.addPoint(points[i].x, points[i].y); 92 polygon.addPoint(points[i].x, points[i].y); 93 polygon1.addPoint(points[i].x, points[i].y); 94 } 95 // Clear the canvas with white color. 96 graphics2D.clear(Color.WHITE); 97 98 graphics2D.setAffineTransform(new AffineTransform()); 99 SolidBrush brush = new SolidBrush(greenColor); 100 graphics2D.fillPolygon(brush, polygon); 101 graphics2D.setAffineTransform(mat1); 102 103 brush = new SolidBrush(blueColor); 104 com.mapdigit.drawing.Pen pen 105 = new com.mapdigit.drawing.Pen(redColor, 5); 106 graphics2D.setPenAndBrush(pen, brush); 107 graphics2D.fillPolygon(null, polygon1); 108 graphics2D.drawPolyline(null, polyline); 109 110 } 111 112 }
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文章名称：Android开发中如何理解RadioButton及路径绘制
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