android 高仿圆形菜单

电玩女神 2023-10-18 20:13 59阅读 0赞

看见一个人写了一个圆形的可以转的菜单，当时看的还是挺模糊的，最后自己模仿的写了一遍，这是源代码

基本思想是这样的

1，把每个图标显示的什么图标确定下来

2，计算每一个点的坐标，

3，在activity就可以正确显示出了

4，当我们移动图标的时候，计算出移动后的图标的角度，知道角度和半径就可以设置它的坐标啊，以它为起始图标，画出剩下的图标

5，实在很模糊，不理解的再议论

启动的Activity

1.import Android.app.Activity;  
2.import android.os.Bundle; 3.  
4.public class Main extends Activity \{

5. /\*\* Called when the activity is first created. \*/

6. @Override

7. public void onCreate(Bundle savedInstanceState) \{

8. super.onCreate(savedInstanceState);

9. setContentView(new CircleMenuActivity(getApplicationContext(), 150, 150, 100)); 10. \}  
11.\}  
菜单生成的类

1.package rw.circle;  
2.  
3.  
4.import android.content.Context;

5.import android.graphics.Bitmap;

6.import android.graphics.BitmapFactory;

7.import android.graphics.Canvas;

8.import android.graphics.Color;

9.import android.graphics.Paint;

10.import android.util.Log;

11.import android.view.MotionEvent;

12.import android.view.View;

14.public class CircleMenuActivity extends View \{

16.private Paint paint=new Paint();

17.private SeeView\[\] seeViews;

18.private static final int MenuCount=6;//桌面图标的个数

19.private int pointX=0,pointY=0;//圆心坐标

20.private static final int radius=150;//半径

21.private int DegreeOfPoint;//两个点之间的角度

22. public CircleMenuActivity(Context context, int x, int y,int radiu) \{

23. super(context);

24. paint.setColor(Color.GREEN);  
25. paint.setStrokeWidth(2);

26. setBackgroundResource(R.drawable.tt1);  
27. pointX=x;  
28. pointY=y;  
29. radiu=radius;  
30. SetPoint();  
31. CalculateCoordinate();  
32. // TODO Auto-generated constructor stub

33. \}  
34. /\* 35. \* 这个函数是设置每一个点  
36. \*/  
37. private void SetPoint() \{

38. // TODO Auto-generated method stub

39. seeViews=new SeeView\[MenuCount\];

40. //SeeView seeView;

41. int angle=0;

42. DegreeOfPoint=360/MenuCount;

43. for (int i = 0; i <MenuCount; i++) \{

44. seeViews\[i\]=new SeeView();

45. seeViews\[i\].angle=angle;  
46. seeViews\[i\].bitmap=BitmapFactory.decodeResource(getResources(),R.drawable.t1+i);  
47. angle+=DegreeOfPoint;  
48. \}  
49. \}  
50. private void resetPointAngle(float x,float y)\{

51. int angle=CalculateAngle(x, y);

52. for (int i = 0; i < MenuCount; i++) \{

53. seeViews\[i\].angle=angle;  
54. angle+=DegreeOfPoint;  
55. \}  
56. \}  
57. //计算坐标 58. private void CalculateCoordinate()\{

59. SeeView seeView;  
60. for (int i = 0; i < MenuCount; i++) \{

61. seeView=seeViews\[i\];  
62. seeView.x=pointX+(float)(radius\*Math.cos(seeView.angle\*Math.PI/180));

63. seeView.y=pointY+(float)(radius\*Math.sin(seeView.angle\*Math.PI/180));

64. \}  
65. \}  
66. private int CalculateAngle(float x,float y) \{

67. float distance=(float)Math.sqrt((x-pointX)\*(x-pointX)+(y-pointY)\*(y-pointY));

68. int degree=(int)(Math.acos((x-pointX)/distance)\*180/Math.PI);

69. if (y<pointY) \{

70. degree=-degree;  
71. \}  
72. return degree;

73.\}  
74.  
75. public boolean dispatchTouchEvent(MotionEvent event) \{