为了更好的学习和工作,动动小手收藏起来吧! 网页上的验证码效果,相信都很多了,移动设备上实现验证码比较少,今天给大家分享的例子就是关于验证码的。 先上效果图:
public class VerificationCode { 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', 'l', 'm', 'n', 'o', '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', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' }; private static VerificationCode bpUtil; private VerificationCode() { }; public static VerificationCode getInstance() { if (bpUtil == null) bpUtil = new VerificationCode(); return bpUtil; } private static final int DEFAULT_CODE_LENGTH = 4; private static final int DEFAULT_FONT_SIZE = 60; private static final int DEFAULT_LINE_NUMBER = 3;// 多少条干扰线 private static final int BASE_PADDING_LEFT = 20; // 左边距 private static final int RANGE_PADDING_LEFT = 35;// 左边距范围值 private static final int BASE_PADDING_TOP = 42;// 上边距 private static final int RANGE_PADDING_TOP = 15;// 上边距范围值 private static final int DEFAULT_WIDTH = 200; private static final int DEFAULT_HEIGHT = 70; private final int DEFAULT_COLOR = 0xdf;// 默认背景颜色值 private int width = DEFAULT_WIDTH; private int height = DEFAULT_HEIGHT; private int base_padding_left = BASE_PADDING_LEFT; private int range_padding_left = RANGE_PADDING_LEFT; private int base_padding_top = BASE_PADDING_TOP; private int range_padding_top = RANGE_PADDING_TOP; private int codeLength = DEFAULT_CODE_LENGTH; private int line_number = DEFAULT_LINE_NUMBER; private int font_size = DEFAULT_FONT_SIZE; private String code;// 保存生成的验证码 private int padding_left, padding_top; private Random random = new Random(); private Bitmap createBitmap() { padding_left = 0; Bitmap bp = Bitmap.createBitmap(width, height, Config.ARGB_8888); Canvas c = new Canvas(bp); code = createCode(); c.drawColor(Color.rgb(DEFAULT_COLOR, DEFAULT_COLOR, DEFAULT_COLOR)); Paint paint = new Paint(); paint.setTextSize(font_size); for (int i = 0; i < code.length(); i++) { randomTextStyle(paint); randomPadding(); c.drawText(code.charAt(i) + "", padding_left, padding_top, paint); } for (int i = 0; i < line_number; i++) { drawLine(c, paint); } c.save(Canvas.ALL_SAVE_FLAG);// 保存 c.restore();// return bp; } public String getCode() { return code.toLowerCase(); } public Bitmap getBitmap() { return createBitmap(); } private String createCode() { StringBuilder buffer = new StringBuilder(); for (int i = 0; i < codeLength; i++) { buffer.append(CHARS[random.nextInt(CHARS.length)]); } return buffer.toString(); } 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); } 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); } 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 } 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: 调用 VerificationCode.getInstance().getBitmap() 赋予imageview即可显示验证码. 例如: ImageView vc_image = (ImageView) findViewById(R.id.vc_image); vc_image.setImageBitmap(VerificationCode.getInstance().getBitmap()); 调用 VerificationCode.getInstance().getCode()即可获取验证码. 如需源码请回复 验证码 获取 |
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