Android 画闹钟

1.今天就来模仿一下这个小闹钟的
2.思路：
先画闹钟的圆盘，在通过Path来画指针
两个耳朵其实就是用两个圆被一个大圆截取后留下的，并旋转一定度数后生成
3.直接上代码：
 1 public class AlarmClockView extends View {
 2 
 3     private static final PorterDuff.Mode MODE = PorterDuff.Mode.DST_OUT;
 4     /**
 5      * 屏幕适应性参数
 6      */
 7     private static final float BIG_RADIU = 1 / 6F;
 8     private static final float SMALL_RADIU = 1 / 12F;
 9     private static final float CLOCKWISE_LENGTH = 1 / 10F;
10     private static final float MINUTE_LENGTH = 1 / 12f;
11     private static final float MASK_RADIU = 1 / 4F;
12 
13     // 大圆盘圈
14     private Paint mPaint;
15     // 指针Paint
16     private Paint zhenPaint;
17     // 小圆Paint
18     private Paint smallCirclePaint;
19     private Path path;
20     private int screenW, screenH;
21     /**
22      * 大圆半径
23      * 
24      * @param context
25      */
26     private float radius_big, small_radiu, clockwise_length, minute_length,
27             mask_radiu;
28 
29     public AlarmClockView(Context context) {
30         super(context);
31     }
32 
33     public AlarmClockView(Context context, AttributeSet attrs) {
34         super(context, attrs);
35 
36         mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
37         mPaint.setStyle(Paint.Style.STROKE);
38         mPaint.setColor(Color.WHITE);
39         mPaint.setStrokeWidth(40);
40 
41         zhenPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
42         zhenPaint.setStyle(Paint.Style.STROKE);
43         zhenPaint.setColor(Color.WHITE);
44         zhenPaint.setStrokeWidth(20);
45 
46         smallCirclePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
47         smallCirclePaint.setStyle(Paint.Style.FILL);
48         smallCirclePaint.setColor(Color.WHITE);
49 
50         screenW = new MeasureUtil().getWindowWidth(context);
51         screenH = new MeasureUtil().getWindowHeigh(context);
52 
53         int size = Math.min(screenW, screenH);
54         radius_big = size * BIG_RADIU;
55         small_radiu = size * SMALL_RADIU;
56         clockwise_length = size * CLOCKWISE_LENGTH;
57         minute_length = size * MINUTE_LENGTH;
58         mask_radiu = size * MASK_RADIU;
59         // 设置指针
60         path = new Path();
61         path.moveTo(screenW / 2, screenH / 2 + 10);
62         path.lineTo(screenW / 2, screenH / 2 - clockwise_length + 10);
63         path.moveTo(screenW / 2 - 10, screenH / 2 + 10);
64         path.lineTo(screenW / 2 + minute_length, screenH / 2 + 10);
65     }
66 
67     @Override
68     protected void onDraw(Canvas canvas) {
69         super.onDraw(canvas);
70         canvas.drawColor(Color.argb(255, 255, 128, 103));
71 
72         canvas.drawCircle(screenW / 2, screenH / 2, radius_big, mPaint);
73         canvas.drawPath(path, zhenPaint);
74 
75         // 画耳朵圆
76         drawEarCircle(canvas, 30);
77         drawEarCircle(canvas, -30);
78 
79     }
80 
81     private void drawEarCircle(Canvas canvas, int degree) {
82         int layerID = canvas.saveLayer(0, 0, screenW, screenH, null,
83                 Canvas.ALL_SAVE_FLAG);
84         canvas.rotate(degree, screenW / 2, screenH / 2);
85         canvas.drawCircle(screenW / 2, screenH / 2 - radius_big - small_radiu,
86                 small_radiu, smallCirclePaint);
87         // 用一个大圆去遮罩
88         PorterDuffXfermode xfermode = new PorterDuffXfermode(MODE);
89         smallCirclePaint.setXfermode(xfermode);
90         canvas.drawCircle(screenW / 2, screenH / 2, mask_radiu,
91                 smallCirclePaint);
92         smallCirclePaint.setXfermode(null);
93         canvas.restoreToCount(layerID);
94     }
95 
96 }
4.运行后的效果是：