Android 实现图形验证码生成

实现步骤：

1. 创建验证码图片
2. 生成验证码
3. 画干扰线
4. 生成随机颜色
5. 随机生成文字样式，颜色，粗细，倾斜度
6. 随机生成padding值

---

• 代码实现全部过程

public class CodeUtils {
    
    
    /**
     * 随机数数组
     * 去除了易混淆的 数字 0 和 字母 o O
     * 数字 1 和 字母 i I l L
     * 数字 6 和 字母 b
     * 数字 9 和 字母 q
     * 字母 c C 和 G
     * 字母 t （经常和随机线混在一起看不清）
     */
    private static final char[] CHARS = {
    
    
            '2', '3', '4', '5', '7', '8',
            'a', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'm',
            'n', 'p', 'r', 's', 'u', 'v', 'w', 'x', 'y', 'z',
            'A', 'B', 'D', 'E', 'F', 'H', 'J', 'K', 'M',
            'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
    };
    private static CodeUtils bmpCode;

    public static CodeUtils getInstance() {
    
    
        if (bmpCode == null)
            bmpCode = new CodeUtils();
        return bmpCode;
    }

    //default settings
    //验证码默认随机数的个数
    private static final int DEFAULT_CODE_LENGTH = 4;
    //默认字体大小
    private static final int DEFAULT_FONT_SIZE = 25;
    //默认线条的条数
    private static final int DEFAULT_LINE_NUMBER = 5;
    //padding值
    private static final int BASE_PADDING_LEFT = 10, RANGE_PADDING_LEFT = 15, BASE_PADDING_TOP = 15, RANGE_PADDING_TOP = 20;
    //验证码的默认宽高
    private static final int DEFAULT_WIDTH = 100, DEFAULT_HEIGHT = 40;
    //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);
        Canvas c = new Canvas(bp);
        code = createCode();
        c.drawColor(Color.WHITE);
        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( Canvas.ALL_SAVE_FLAG );//保存
        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);
    }
}

• 如何使用？

//  初始化控件
ImageView img_code = findViewById(R.id.img_code);
 //设置setImageBitmap
img_code.setImageBitmap(CodeUtils.getInstance().createBitmap());

• 效果图