android端实现验证码随机生成功能
2019年12月18日
作者:佚名
本文实例为大家分享了android端生成随机验证码的具体代码,供大家参考,具体内容如下
package com.nobeg.util; import java.util.Random; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Bitmap.Config; public class Code { private static final char[] CHARS = { '2','3','4','5','6','7','8','9','a','b','c','d','e','f','g','h','j','k','l','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 private static final int DEFAULT_CODE_LENGTH = 3; private static final int DEFAULT_FONT_SIZE = 25; private static final int DEFAULT_LINE_NUMBER = 2; private static final int BASE_PADDING_LEFT = 5,RANGE_PADDING_LEFT = 15,BASE_PADDING_TOP = 15,RANGE_PADDING_TOP = 20; private static final int DEFAULT_WIDTH = 60,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.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; } //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(); } 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为非下划线 // paint.setStrikeThruText(true); //true为删除线,false为非删除线 } private void randomPadding() { padding_left += base_padding_left + random.nextInt(range_padding_left); padding_top = base_padding_top + random.nextInt(range_padding_top); } }
java代码:
yanzhengma_img = (ImageView) findViewById(R.id.yanzhengma_img); yanzhengma_huan = (Button) findViewById(R.id.yanzhengma_huan); yanzhengma_val = (EditText) findViewById(R.id.yanzhengma_val); yanzhengma_img.setImageBitmap(code.getInstance().createBitmap()); System.out.println("验证码:"+code.getInstance().getCode()); yanzhengma_huan.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { yanzhengma_img.setImageBitmap(code.getInstance().createBitmap()); System.out.println("验证码:"+code.getInstance().getCode()); } });
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编程小技巧。
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