android 端生成随机验证码 实现
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- 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);
- }
- }
- 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());
- }
- });
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