Android开发中验证码的生成

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近期在做电商金融类的项目，验证码的生成方法不可缺少。先学习了一种。经过測试好用。从别处学习的代码，稍修改了一下可选择是否支持识别大写和小写。直接上代码。

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.EditText;

import android.widget.ImageView;

import android.widget.Toast;

public class VerifyCodeActivity extends Activity {

private ImageView vc_image; // 验证码图标

private String getCode = null; // 获取验证码的值

private EditText vc_code; // 文本框的值

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.verifycode);

vc_image = (ImageView) findViewById(R.id.verify_imv);

vc_code = (EditText) findViewById(R.id.myedit);

getCode = SecurityCode.getInstance().getCode(false); // 获取显示的验证码

findViewById(R.id.vc_shuaxin).setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

vc_image.setImageBitmap(SecurityCode.getInstance().getBitmap());

getCode = SecurityCode.getInstance().getCode(false);

}

});

findViewById(R.id.verfiy).setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

String verfiyString = vc_code.getText().toString();

if (verfiyString.equals(getCode)) {

Toast.makeText(getApplicationContext(), "验证码输入正确", Toast.LENGTH_LONG).show();

} else {

Toast.makeText(getApplicationContext(), "验证码输入错误", Toast.LENGTH_LONG).show();

}

});

}

import java.util.Locale;

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;

/**

* @Description:验证码生成类

public class SecurityCode {

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 SecurityCode bpUtil;

public static SecurityCode getInstance() {

if (bpUtil == null)

bpUtil = new SecurityCode();

return bpUtil;

}

// default settings

private 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 = 70;// 默认高度.图片的总高

private final int DEFAULT_COLOR = 0xdf;// 默认背景颜色值

// settings decided by the layout xml

// canvas width and height

private int width = DEFAULT_WIDTH;

private int height = DEFAULT_HEIGHT;

// random word space and pading_top

private int base_padding_left = BASE_PADDING_LEFT;

private int range_padding_left = RANGE_PADDING_LEFT;

private int base_padding_top = BASE_PADDING_TOP;

private int range_padding_top = RANGE_PADDING_TOP;

// number of chars, lines; font size

private int codeLength = DEFAULT_CODE_LENGTH;

private int line_number = DEFAULT_LINE_NUMBER;

private int font_size = DEFAULT_FONT_SIZE;

// variables

private String code;// 保存生成的验证码

private int padding_left, padding_top;

private Random random = new Random();

private Bitmap createBitmap() {

padding_left = 0;

Bitmap bp = Bitmap.createBitmap(width, height, Config.ARGB_8888);

Canvas c = new Canvas(bp);

code = createCode();

c.drawColor(Color.rgb(DEFAULT_COLOR, DEFAULT_COLOR, DEFAULT_COLOR));

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;

}

/**

* @Description:是否区分大写和小写

public String getCode(boolean isMatchCase) {

if (isMatchCase) {

if (code != null) {

code.toLowerCase(Locale.getDefault());

}

} else {

return code;

}

return null;

}

public Bitmap getBitmap() {

return createBitmap();

}

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类型參数。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);

}

布局文件

xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >