随着互联网的高速发展,一个应用为了保护用户的隐私,通常会通过设置用户名+密码的验证方式保证用户隐私的相对安全,我知道一般网站的登录验证,通常会设置一个二维码,通过验证二维码,防止恶意软件通过机械程序,对用户密码进行破解,那么Android设备如何实现这个功能呢?相信很多开发者对此 ...
随着互联网的高速发展,一个应用为了保护用户的隐私,通常会通过设置用户名+密码的验证方式保证用户隐私的相对安全,我知道一般网站的登录验证,通常会设置一个二维码,通过验证二维码,防止恶意软件通过机械程序,对用户密码进行破解,那么Android设备如何实现这个功能呢?相信很多开发者对此不屑一顾,因为这样增加了用户使用的复杂性,很多软件是不会这样设计的,现在我们暂且不谈它是不是有用,今天我们重点探讨一下,如何在Android的设备上实现这个功能。本篇为大家介绍的内容包括:1、用户连续多次输错密码,增加验证码验证;2、Android如何通过http请求达到与服务器之间的通讯。好了下面开始我们今天内容的介绍,首先我们先一起来学习一下如何实现用户连续多次输错密码,增加验证码功能。
既然用的到二维码,那么Android如何生成二维码呢?为大家提供一个生成二维码的类:
//生成二维码的类public class BPUtil { /** * 用于生成二维码的字符 */ 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','l','n','o','p','q','r','s','t','u','v','w','x','y','z', 'A','B','C','D','E','F','G','H','I','J','K','M','L','N','O','P','Q','R','S','T','U','V','W','X','Y','Z' }; private static BPUtil bpUtil; public static BPUtil getInstance() { if(bpUtil == null) bpUtil = new BPUtil(); return bpUtil; } // width="60" height="30" // base_padding_left="5"// range_padding_left="10"// base_padding_top="15"// range_padding_top="10"// codeLength="4"// line_number="3"// font_size="20" //default settings private static final int DEFAULT_CODE_LENGTH = 4; private static final int DEFAULT_FONT_SIZE = 20; private static final int DEFAULT_LINE_NUMBER = 3; private static final int BASE_PADDING_LEFT = 5, RANGE_PADDING_LEFT = 10, BASE_PADDING_TOP = 15, RANGE_PADDING_TOP = 10; private static final int DEFAULT_WIDTH = 60, DEFAULT_HEIGHT = 30; //settings decided by the layout //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(); public Bitmap createBitmap() { padding_left = 0; Bitmap bp = Bitmap.createBitmap(width, height, Config.ARGB_8888); Canvas c = new Canvas(bp); code = createCode(); c.drawColor(Color.WHITE); 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 bpUtil.createCode(); } 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// paint.setUnderlineText(true); //true为下划线,false为非下划// paint.setStrikeThruText(true); //true为删除线,false为非删除 } private void randomPadding() { padding_left += base_padding_left + random.nextInt(range_padding_left); padding_top = base_padding_top + random.nextInt(range_padding_top); }}
原标题:Android之登录那点事
关键词:Android
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