Android随机生成验证码
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2024-03-01 08:14:22
android随机生成验证码,android利用随机数绘制不规则的验证码,加强用户登录或者注册的安全性。
具体思路如下:
在一块固定宽高的画布上,画上固定个数的随机数字...
android随机生成验证码,android利用随机数绘制不规则的验证码,加强用户登录或者注册的安全性。
具体思路如下:
在一块固定宽高的画布上,画上固定个数的随机数字和字母,再画上固定条数的干扰线
随机数和干扰线的颜色随机生成,随机数的样式随机生成。
界面效果如下:
1、生成随机数代码,code.java:
public class code { //随机数数组 private static final char[] chars = { '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', '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 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, 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.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); } }
2、编写布局文件,activity_main.xml:
<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <relativelayout android:layout_width="match_parent" android:layout_height="50dp" android:background="@color/main_color_white" > <textview android:id="@+id/tv_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerinparent="true" android:text="找回密码" android:textcolor="@color/loan_butbackground" android:textsize="20sp" /> </relativelayout> <linearlayout android:layout_width="match_parent" android:layout_height="40dp" android:layout_margintop="30dp" android:orientation="vertical" android:layout_marginleft="15dp" android:layout_marginright="15dp" android:background="@drawable/security_code_bg"> <linearlayout android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center_vertical" android:orientation="horizontal" > <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginleft="20dp" android:layout_marginright="20dp" android:text="中国+86" android:textcolor="#a2cd5a" android:textsize="16sp" /> <view android:layout_width="0.1dp" android:layout_height="match_parent" android:background="@color/loan_butbackground" /> <edittext android:id="@+id/et_forgetpass_phonenum" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginleft="20dp" android:background="@null" android:digits="0123456789" android:hint="请填入您的手机号" android:inputtype="number" android:maxlength="11" android:textsize="16sp" /> </linearlayout> </linearlayout> <linearlayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginleft="15dp" android:layout_marginright="15dp" android:layout_margintop="20dp" android:orientation="horizontal" > <linearlayout android:layout_width="wrap_content" android:layout_height="40dp" android:background="@drawable/security_code_bg" > <edittext android:id="@+id/et_phonecodes" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginleft="10dp" android:layout_marginright="10dp" android:background="@null" android:hint="请输入右侧验证码" /> </linearlayout> <imageview android:id="@+id/iv_showcode" android:layout_width="100dp" android:layout_marginleft="10dp" android:layout_height="match_parent" /> </linearlayout> <button android:id="@+id/but_forgetpass_tosetcodes" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="20dp" android:background="@drawable/buttonshape" android:text="提交验证码" android:textcolor="@color/main_color_white" /> </linearlayout>
3、在主界面生成随机数,校验验证码mainactivity.java:
public class mainactivity extends activity implements onclicklistener { public static final string tag = mainactivity.class.getname(); private imageview iv_showcode; private edittext et_phonecode; private edittext et_phonenum; //产生的验证码 private string realcode; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); et_phonecode = (edittext) findviewbyid(r.id.et_phonecodes); button but_tosetcode = (button) findviewbyid(r.id.but_forgetpass_tosetcodes); but_tosetcode.setonclicklistener(this); iv_showcode = (imageview) findviewbyid(r.id.iv_showcode); //将验证码用图片的形式显示出来 iv_showcode.setimagebitmap(code.getinstance().createbitmap()); realcode = code.getinstance().getcode().tolowercase(); iv_showcode.setonclicklistener(this); } @override public void onclick(view v) { switch (v.getid()) { case r.id.iv_showcode: iv_showcode.setimagebitmap(code.getinstance().createbitmap()); realcode = code.getinstance().getcode().tolowercase(); log.v(tag,"realcode"+realcode); break; case r.id.but_forgetpass_tosetcodes: string phonecode = et_phonecode.gettext().tostring().tolowercase(); string msg = "生成的验证码:"+realcode+"输入的验证码:"+phonecode; toast.maketext(mainactivity.this,msg,toast.length_long).show(); if (phonecode.equals(realcode)) { toast.maketext(mainactivity.this, phonecode + "验证码正确", toast.length_short).show(); } else { toast.maketext(mainactivity.this, phonecode + "验证码错误", toast.length_short).show(); } break; } } }
至此,基本功能已实现,源码下载:http://xiazai.jb51.net/201611/yuanma/androidsecuritycode(jb51.net).rar
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。