android生成验证码bitmap

不多说了，直接上代码，项目中用到的，未做优化，还有很多参数未设置。

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 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;}//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 settingsprivate 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 xml//canvas width and heightprivate int width = DEFAULT_WIDTH, height = DEFAULT_HEIGHT; //random word space and pading_topprivate 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 sizeprivate int codeLength = DEFAULT_CODE_LENGTH, line_number = DEFAULT_LINE_NUMBER, font_size = DEFAULT_FONT_SIZE;//variablesprivate 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 code;}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);}}

使用方法

ImageView imageView = (ImageView)findViewById(R.id.imageView);imageView.setImageBitmap(BPUtil.getInstance().createBitmap());