Android的登陆界面生成验证码

来源：互联网发布：服装cad软件排名编辑：程序博客网时间：2024/04/28 16:51

简单的实现，可以把这个当做一个工具类直接使用

package cn.com.lhy;import java.util.Random;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;public class BPUtil {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 BPUtil bputil;public static BPUtil getinstance(){if(bputil==null){bputil=new BPUtil();}return bputil;}private static final int DEFAULT_CODE_LENGTH = 4;//默认验证码的长度    private static final int DEFAULT_FONT_SIZE = 30;//默认字体大小    private static final int DEFAULT_LINE_NUMBER = 6;//默认线的数量    private static final int BASE_PADDING_LEFT = 10, //左边距                     RANGE_PADDING_LEFT = 20,//左边距范围值                     BASE_PADDING_TOP = 15, //上边距                     RANGE_PADDING_TOP = 20;  //上边距范围值    private static final int DEFAULT_WIDTH = 120,//默认宽度，图片的总宽度                    DEFAULT_HEIGHT = 50;//默认宽、高    private int width = DEFAULT_WIDTH, height = DEFAULT_HEIGHT;    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;    private int codeLength = DEFAULT_CODE_LENGTH,     line_number = DEFAULT_LINE_NUMBER,     font_size = DEFAULT_FONT_SIZE;    private String code;      private int padding_left, padding_top;      private Random random = new Random(); //生成一个可以产生随机变量的对象    public Bitmap createBitmap() {  //创建bitmap        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);  //设置字体大小                  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() {  //从登陆界面是获得生成的验证码的数字，返回的是字符型        return code;      }      //生成随机数      private String createCode() {          StringBuilder buffer = new StringBuilder();          for (int i = 0; i < codeLength; i++) {              buffer.append(CHARS[random.nextInt(CHARS.length)]); //利用数组站对应的位置来随机生成             //StringBuilder将文本或对象的字符串表示形式添加到由当前 StringBuilder 对象表示的字符串的结尾处。        }          return buffer.toString();  //返回时将buffer转换成string类型    }      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); //设置线宽          paint.setColor(color);  //给字体附加颜色        canvas.drawLine(startX, startY, stopX, stopY, paint);  //画图开始的位置    }     private int randomColor() {          return randomColor(1);      }      //随机生成的颜色    private int randomColor(int rate) {  //这里面用到的颜色是根据这个红绿色蓝色        int red = random.nextInt(256) / rate;  //通过随机生成的0-255之间的数字，这些数字再通过16进制转化，例如红色#ff0000就是是红色255，蓝色绿色0000        int green = random.nextInt(256) / rate;  //刚好rate传的是一个1，就是16进制的        int blue = random.nextInt(256) / rate;          return Color.rgb(red, green, blue);      }      private void randomTextStyle(Paint paint) {          int color = randomColor(); //颜色随机生成 颜色        paint.setColor(color);  //对字体设置生成的颜色        paint.setFakeBoldText(random.nextBoolean());  //true为粗体，false为非粗体           float skewX = random.nextInt(11) / 10;          skewX = random.nextBoolean() ? skewX : -skewX; //三目运算符如果random随机生成为true的话就是skeyX，否则-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);      }  }

在主的activity中

imageview.setImageBitmap(BPUtil.getinstance().createBitmap());//这里得先就给它设置一个imageview.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {imageview.setImageBitmap(BPUtil.getinstance().createBitmap());et.setText("");}});login.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {String  code = et.getText().toString().trim();Toast.makeText(LoginActivity.this, code, 500).show();if(code.equals(BPUtil.getinstance().getCode())){Toast.makeText(LoginActivity.this, "恭喜，验证通过", 500).show();Intent  intent = new Intent(LoginActivity.this,Welcome_Activity.class);startActivity(intent);}else{Toast.makeText(LoginActivity.this, "对不起，验证失败", 500).show();}}});

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