图片验证码

主要代码
我的Gitbub地址：https://github.com/shenglintang/LinCode

package com.example.pic_checkdemo;

import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.util.Log;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;

import java.util.Random;

/**
* Created by Jackie on 2015/12/1. 用于图片验证码的工具类
*/
public class CodeUtils {
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 CodeUtils mCodeUtils;private int mPaddingLeft, mPaddingTop;private StringBuilder mBuilder = new StringBuilder();private Random mRandom = new Random();private String code;// Default Settingsprivate static final int DEFAULT_CODE_LENGTH = 4;// 验证码的长度 这里是4位private static final int DEFAULT_FONT_SIZE = 60;// 字体大小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;// 默认宽度.图片的总宽private static final int DEFAULT_HEIGHT = 100;// 默认高度.图片的总高private static final int DEFAULT_COLOR = 0xDF;// 默认背景颜色值public static CodeUtils getInstance() {    if (mCodeUtils == null) {        mCodeUtils = new CodeUtils();    }    return mCodeUtils;}// 生成验证码图片public Bitmap createBitmap() {    mPaddingLeft = 0; // 每次生成验证码图片时初始化    mPaddingTop = 0;    Bitmap bitmap = Bitmap.createBitmap(DEFAULT_WIDTH, DEFAULT_HEIGHT, Config.ARGB_8888);    Canvas canvas = new Canvas(bitmap);    // 生成的验证码    String code = createCode();    canvas.drawColor(Color.rgb(DEFAULT_COLOR, DEFAULT_COLOR, DEFAULT_COLOR));    Paint paint = new Paint();    paint.setTextSize(DEFAULT_FONT_SIZE);    Log.e("111111111", code);    for (int i = 0; i < code.length(); i++) {        randomTextStyle(paint);        randomPadding();        canvas.drawText(code.charAt(i) + "", mPaddingLeft, mPaddingTop, paint);    }    // 干扰线    for (int i = 0; i < DEFAULT_LINE_NUMBER; i++) {        drawLine(canvas, paint);    }    canvas.save(Canvas.ALL_SAVE_FLAG);// 保存    canvas.restore();    return bitmap;}// 生成验证码public String createCode() {    mBuilder.delete(0, mBuilder.length()); // 使用之前首先清空内容    for (int i = 0; i < DEFAULT_CODE_LENGTH; i++) {        mBuilder.append(CHARS[mRandom.nextInt(CHARS.length)]);    }    code = mBuilder.toString();    return mBuilder.toString();}// 获取验证码public String getCode() {    return code;}// 生成干扰线private void drawLine(Canvas canvas, Paint paint) {    int color = randomColor();    int startX = mRandom.nextInt(DEFAULT_WIDTH);    int startY = mRandom.nextInt(DEFAULT_HEIGHT);    int stopX = mRandom.nextInt(DEFAULT_WIDTH);    int stopY = mRandom.nextInt(DEFAULT_HEIGHT);    paint.setStrokeWidth(1);    paint.setColor(color);    canvas.drawLine(startX, startY, stopX, stopY, paint);}// 随机颜色private int randomColor() {    mBuilder.delete(0, mBuilder.length()); // 使用之前首先清空内容    String haxString;    for (int i = 0; i < 3; i++) {        haxString = Integer.toHexString(mRandom.nextInt(0xFF));        if (haxString.length() == 1) {            haxString = "0" + haxString;        }        mBuilder.append(haxString);    }    return Color.parseColor("#" + mBuilder.toString());}// 随机文本样式private void randomTextStyle(Paint paint) {    int color = randomColor();    paint.setColor(color);    paint.setFakeBoldText(mRandom.nextBoolean()); // true为粗体，false为非粗体    float skewX = mRandom.nextInt(11) / 10;    skewX = mRandom.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}// 随机间距private void randomPadding() {    mPaddingLeft += BASE_PADDING_LEFT + mRandom.nextInt(RANGE_PADDING_LEFT);    mPaddingTop = BASE_PADDING_TOP + mRandom.nextInt(RANGE_PADDING_TOP);}

}