android生成验证码bitmap

不多说了，直接上代码，项目中用到的，未做优化，还有很多参数未设置。



[java] view plaincopy
 
1.import java.util.Random;  
2.  
3.import android.graphics.Bitmap;  
4.import android.graphics.Canvas;  
5.import android.graphics.Color;  
6.import android.graphics.Paint;  
7.import android.graphics.Bitmap.Config;  
8.  
9.public class BPUtil {  
10.      
11.    private static final char[] CHARS = {  
12.        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',  
13.        'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',   
14.        'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',  
15.        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',   
16.        'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'  
17.    };  
18.      
19.    private static BPUtil bpUtil;  
20.      
21.    public static BPUtil getInstance() {  
22.        if(bpUtil == null)  
23.            bpUtil = new BPUtil();  
24.        return bpUtil;  
25.    }  
26.      
27.//  width="60" height="30"   
28.//          base_padding_left="5"  
29.//          range_padding_left="10"  
30.//          base_padding_top="15"  
31.//          range_padding_top="10"  
32.//          codeLength="4"  
33.//          line_number="3"  
34.//          font_size="20"  
35.      
36.    //default settings  
37.    private static final int DEFAULT_CODE_LENGTH = 4;  
38.    private static final int DEFAULT_FONT_SIZE = 20;  
39.    private static final int DEFAULT_LINE_NUMBER = 3;  
40.    private static final int BASE_PADDING_LEFT = 5, RANGE_PADDING_LEFT = 10, BASE_PADDING_TOP = 15, RANGE_PADDING_TOP = 10;  
41.    private static final int DEFAULT_WIDTH = 60, DEFAULT_HEIGHT = 30;  
42.      
43.    //settings decided by the layout xml  
44.    //canvas width and height  
45.    private int width = DEFAULT_WIDTH, height = DEFAULT_HEIGHT;   
46.      
47.    //random word space and pading_top  
48.    private int base_padding_left = BASE_PADDING_LEFT, range_padding_left = RANGE_PADDING_LEFT,   
49.            base_padding_top = BASE_PADDING_TOP, range_padding_top = RANGE_PADDING_TOP;  
50.      
51.    //number of chars, lines; font size  
52.    private int codeLength = DEFAULT_CODE_LENGTH, line_number = DEFAULT_LINE_NUMBER, font_size = DEFAULT_FONT_SIZE;  
53.      
54.    //variables  
55.    private String code;  
56.    private int padding_left, padding_top;  
57.    private Random random = new Random();  
58.      
59.    public Bitmap createBitmap() {  
60.        padding_left = 0;  
61.          
62.        Bitmap bp = Bitmap.createBitmap(width, height, Config.ARGB_8888);   
63.        Canvas c = new Canvas(bp);  
64.  
65.        code = createCode();  
66.          
67.        c.drawColor(Color.WHITE);  
68.        Paint paint = new Paint();  
69.        paint.setTextSize(font_size);  
70.          
71.        for (int i = 0; i < code.length(); i++) {  
72.            randomTextStyle(paint);  
73.            randomPadding();  
74.            c.drawText(code.charAt(i) + "", padding_left, padding_top, paint);  
75.        }  
76.  
77.        for (int i = 0; i < line_number; i++) {  
78.            drawLine(c, paint);  
79.        }  
80.          
81.        c.save( Canvas.ALL_SAVE_FLAG );//保存    
82.        c.restore();//  
83.        return bp;  
84.    }  
85.      
86.    public String getCode() {  
87.        return code;  
88.    }  
89.      
90.    private String createCode() {  
91.        StringBuilder buffer = new StringBuilder();  
92.        for (int i = 0; i < codeLength; i++) {  
93.            buffer.append(CHARS[random.nextInt(CHARS.length)]);  
94.        }  
95.        return buffer.toString();  
96.    }  
97.      
98.    private void drawLine(Canvas canvas, Paint paint) {  
99.        int color = randomColor();  
100.        int startX = random.nextInt(width);  
101.        int startY = random.nextInt(height);  
102.        int stopX = random.nextInt(width);  
103.        int stopY = random.nextInt(height);  
104.        paint.setStrokeWidth(1);  
105.        paint.setColor(color);  
106.        canvas.drawLine(startX, startY, stopX, stopY, paint);  
107.    }  
108.      
109.    private int randomColor() {  
110.        return randomColor(1);  
111.    }  
112.  
113.    private int randomColor(int rate) {  
114.        int red = random.nextInt(256) / rate;  
115.        int green = random.nextInt(256) / rate;  
116.        int blue = random.nextInt(256) / rate;  
117.        return Color.rgb(red, green, blue);  
118.    }  
119.      
120.    private void randomTextStyle(Paint paint) {  
121.        int color = randomColor();  
122.        paint.setColor(color);  
123.        paint.setFakeBoldText(random.nextBoolean());  //true为粗体，false为非粗体  
124.        float skewX = random.nextInt(11) / 10;  
125.        skewX = random.nextBoolean() ? skewX : -skewX;  
126.        paint.setTextSkewX(skewX); //float类型参数，负数表示右斜，整数左斜  
127.//      paint.setUnderlineText(true); //true为下划线，false为非下划线  
128.//      paint.setStrikeThruText(true); //true为删除线，false为非删除线  
129.    }  
130.      
131.    private void randomPadding() {  
132.        padding_left += base_padding_left + random.nextInt(range_padding_left);  
133.        padding_top = base_padding_top + random.nextInt(range_padding_top);  
134.    }  
135.}  


使用方法



[java] view plaincopy
 
1.ImageView imageView = (ImageView)findViewById(R.id.imageView);  
2.imageView.setImageBitmap(BPUtil.getInstance().createBitmap());  

 

摘自：http://blog.csdn.net/whumr1/article/details/7092013