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[操作系统]android 生成验证码图片


(转自:http://blog.csdn.net/onlyonecoder/article/details/8231373)

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

 调用:

  /**   * 生成验证码   */  private void createConfirmCode(){    mImageView.setImageBitmap(ConfirmCode.getInstance()        .createBitmap());    String Code = ConfirmCode.getInstance().getCode();      }