code.java
package com.huatec.myapplication;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import java.util.Random;
public class Code {
//随机数数组
private static final char[] CHARS = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k', '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'
};
//验证码默认随机数的个数
private static final int DEFAULT_CODE_LENGTH = 4;
//默认字体大小
private static final int DEFAULT_FONT_SIZE = 25;
//默认线条的条数
private static final int DEFAULT_LINE_NUMBER = 5;
//padding值
private static final int
BASE_PADDING_LEFT = 10, RANGE_PADDING_LEFT = 15,
BASE_PADDING_TOP = 15, RANGE_PADDING_TOP = 20;
//验证码的默认宽高
private static final int DEFAULT_WIDTH = 100, DEFAULT_HEIGHT = 40;
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;
//variables
private String code;
private int padding_left, padding_top;
private Random random = new Random();
private static Code bmpCode;
public static Code getInstance() {
if (bmpCode == null)
bmpCode = new Code();
return bmpCode;
}
//验证码图片
public Bitmap createBitmap() {
padding_left = 0;
//绘值位图
Bitmap bp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
//创建画板
Canvas c = new Canvas(bp);
//绘制新的验证码
code = createCode();
//设置背景色
c.drawColor(Color.WHITE);
//创建画笔
Paint paint = new Paint();
paint.setAntiAlias(true);
//设置字号
paint.setTextSize(font_size);
//画验证码
for (int i = 0; i < code.length(); i++) {
randomTextStyle(paint);
randomPadding();
//绘制显示文字
c.drawText(code.charAt(i) + "", padding_left, padding_top, paint);
}
//画线条
for (int i = 0; i < line_number; i++) {
//绘制线条
drawLine(c, paint);
}
c.save(Canvas.ALL_SAVE_FLAG);//保存
c.restore();
return bp;
}
//得到验证码
public String getCode() {
return code;
}
//生成验证码
private String createCode() {
StringBuilder buffer = new StringBuilder();
for (int i = 0; i < codeLength; i++) {
buffer.append(CHARS[random.nextInt(CHARS.length)]);
}
return buffer.toString();
}
//画干扰线
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);
//绘制线
canvas.drawLine(startX, startY, stopX, stopY, paint);
}
//生成随机颜色
private int randomColor() {
return randomColor(1);
}
//获得随机数
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);
}
//随机生成文字样式，颜色，粗细，倾斜度
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
}
//随机生成padding值
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：
package com.huatec.myapplication;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private static final String TAG = "MainActivity";
private ImageView iv_showCode;
private EditText et_phoneCode;
private EditText et_phoneNum;
private String realCode;
private Button but_toSetCode;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//验证码输入框
et_phoneCode = (EditText) findViewById(R.id.et_phoneCodes);
//登录按钮
but_toSetCode = (Button) findViewById(R.id.but_forgetpass_toSetCodes);
but_toSetCode.setOnClickListener(this);
//imageView用于显示验证码
iv_showCode = (ImageView) findViewById(R.id.iv_showCode);
//将验证码用图片的形式显示出来
iv_showCode.setImageBitmap(Code.getInstance().createBitmap());
iv_showCode.setOnClickListener(this);
//获取验证码值
realCode = Code.getInstance().getCode().toLowerCase();
}
@Override
public void onClick(View v) {
switch (v.getId()) {
//点击imageView（刷新验证码）
case R.id.iv_showCode:
iv_showCode.setImageBitmap(Code.getInstance().createBitmap());
//获取最新验证码值
realCode = Code.getInstance().getCode().toLowerCase();
break;
//点击"登录"按钮（比较验证码）
case R.id.but_forgetpass_toSetCodes:
//手动输入的验证码
String phoneCode = et_phoneCode.getText().toString().toLowerCase();
if (phoneCode.equals(realCode)) {//比较
Toast.makeText(MainActivity.this, phoneCode + "验证码正确", Toast.LENGTH_SHORT).show();
} else {
String msg = "生成的验证码：" + realCode + "\n" + "输入的验证码:" + phoneCode;
Toast.makeText(MainActivity.this, "验证码错误:" + "\n" + msg, Toast.LENGTH_LONG).show();
}
break;
}
}
}
效果图：
2018-05-29 22_43_12.gif
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