Android(安卓)随机生成验证码的bitmap

import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import java.util.Random;public class Code {    //随机数数组    private static final char[] CHARS = {            '0','1','2', '3', '4', '5', '6', '7', '8', '9',            'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h','i', 'j', 'k', 'm',            'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',            'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',            'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'    };    private static Code bmpCode;    public static Code getInstance() {        if(bmpCode == null)            bmpCode = new Code();        return bmpCode;    }    //default settings    //验证码默认随机数的个数 可以根据实际需求    private static final int DEFAULT_CODE_LENGTH = 6;    //默认字体大小     private static final int DEFAULT_FONT_SIZE = 28;    //默认线条的条数    private static final int DEFAULT_LINE_NUMBER = 2;    //padding值 可以自行调整，这块是跟几位验证码有关，所以根据几位验证码自行调整    private static final int BASE_PADDING_LEFT = 25, RANGE_PADDING_LEFT = 10, BASE_PADDING_TOP = 20, RANGE_PADDING_TOP = 20;    //验证码的默认宽高 生成的bitmap的宽度与高度，根据验证码位数以及间距等，调整测试    private static final int DEFAULT_WIDTH = 240, DEFAULT_HEIGHT = 50;    //settings decided by the layout xml    //canvas width and height    private int width = DEFAULT_WIDTH, height = DEFAULT_HEIGHT;    //random word space and pading_top    private int base_padding_left = BASE_PADDING_LEFT, range_padding_left = RANGE_PADDING_LEFT,            base_padding_top = BASE_PADDING_TOP, range_padding_top = RANGE_PADDING_TOP;    //number of chars, lines; font size    private int codeLength = DEFAULT_CODE_LENGTH, line_number = DEFAULT_LINE_NUMBER, font_size = DEFAULT_FONT_SIZE;    //variables    private String code;    private int padding_left, padding_top;    private Random random = new Random();    //验证码图片    public Bitmap createBitmap() {        padding_left = 0;        Bitmap bp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);//图片清晰度，可以改        Canvas c = new Canvas(bp);        code = createCode();        c.drawColor(Color.WHITE);//这里底色可以改成自己想要底色        Paint paint = new Paint();        paint.setAntiAlias(true);        paint.setTextSize(font_size);        //画验证码        for (int i = 0; i < code.length(); i++) {            randomTextStyle(paint);            randomPadding();            c.drawText(code.charAt(i) + "", padding_left, padding_top, paint);        }        //画线条        for (int i = 0; i < line_number; i++) {            drawLine(c, paint);        }        c.save();//保存        c.restore();//        return bp;    }    public String getCode() {        return code;    }    //生成验证码    private String createCode() {        StringBuilder buffer = new StringBuilder();        for (int i = 0; i < codeLength; i++) {            buffer.append(CHARS[random.nextInt(CHARS.length)]);        }        return buffer.toString();    }    //画干扰线    private void drawLine(Canvas canvas, Paint paint) {        int color = randomColor();        int startX = random.nextInt(width);        int startY = random.nextInt(height);        int stopX = random.nextInt(width);        int stopY = random.nextInt(height);        paint.setStrokeWidth(1);        paint.setColor(color);        canvas.drawLine(startX, startY, stopX, stopY, paint);    }    //生成随机颜色    private int randomColor() {        return randomColor(1);    }    private int randomColor(int rate) {        int red = random.nextInt(256) / rate;        int green = random.nextInt(256) / rate;        int blue = random.nextInt(256) / rate;        return Color.rgb(red, green, blue);    }    //随机生成文字样式，颜色，粗细，倾斜度    private void randomTextStyle(Paint paint) {        int color = randomColor();        paint.setColor(color);        paint.setFakeBoldText(random.nextBoolean());  //true为粗体，false为非粗体        float skewX = random.nextInt(11) / 10;        skewX = random.nextBoolean() ? skewX : -skewX;        paint.setTextSkewX(skewX); //float类型参数，负数表示右斜，整数左斜        //paint.setUnderlineText(true); //true为下划线，false为非下划线        //paint.setStrikeThruText(true); //true为删除线，false为非删除线    }    //随机生成padding值    private void randomPadding() {        padding_left += base_padding_left + random.nextInt(range_padding_left);        padding_top = base_padding_top + random.nextInt(range_padding_top);    }}
原文章链接https://www.cnblogs.com/jenson138/p/4437088.html
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