Android Realizes Random Generation of Verification Codes
- 2021-12-19 06:39:29
- OfStack
In this paper, we share the random generation code of Android verification code for your reference. The specific contents are as follows
Code.java
package com.example.myapp;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import java.util.Random;
public class Code {
/**
* Random number array
* Remove confusing Figures 0 And Alphabet o O
* Figures 1 And Alphabet i I l L
* Figures 6 And Alphabet b
* Figures 9 And Alphabet q
* Alphabet c C And G
* Alphabet t (Often mixed with random lines 1 Can't see clearly)
*/
private static final char[] CHARS = {
'2', '3', '4', '5', '7', '8',
'a', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'm',
'n', 'p', 'r', 's', 'u', 'v', 'w', 'x', 'y', 'z',
'A', 'B', 'D', 'E', 'F', 'H', 'J', 'K', '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
// Number of default random numbers of verification code
private static final int DEFAULT_CODE_LENGTH = 4;
// Default font size
private static final int DEFAULT_FONT_SIZE = 25;
// Default number of lines
private static final int DEFAULT_LINE_NUMBER = 5;
//padding Value
private static final int BASE_PADDING_LEFT = 10, RANGE_PADDING_LEFT = 15, BASE_PADDING_TOP = 15, RANGE_PADDING_TOP = 20;
// Default width and height of verification code
private static final int DEFAULT_WIDTH = 100, 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();
// Verification code picture
public Bitmap createBitmap() {
padding_left = 0;
Bitmap bp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(bp);
code = createCode();
c.drawColor(Color.WHITE);
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setTextSize(font_size);
// Draw verification code
for (int i = 0; i < code.length(); i++) {
randomTextStyle(paint);
randomPadding();
c.drawText(code.charAt(i) + "", padding_left, padding_top, paint);
}
// Draw lines
for (int i = 0; i < line_number; i++) {
drawLine(c, paint);
}
// c.save( Canvas.ALL_SAVE_FLAG );// Save
c.save();// Save
c.restore();//
return bp;
}
public String getCode() {
return code;
}
// Generate verification 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();
}
// Draw interference lines
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);
}
// Generate random colors
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);
}
// Randomly generate text style, color, thickness and inclination
private void randomTextStyle(Paint paint) {
int color = randomColor();
paint.setColor(color);
paint.setFakeBoldText(random.nextBoolean()); //true Is bold, false Is non-bold
float skewX = random.nextInt(11) / 10;
skewX = random.nextBoolean() ? skewX : -skewX;
paint.setTextSkewX(skewX); //float Type parameter, negative number indicates right slant and integer left slant
//paint.setUnderlineText(true); //true To underline, false Is not underlined
//paint.setStrikeThruText(true); //true For strikethrough, false Is a non-strikeout line
}
// Random generation padding Value
private void randomPadding() {
padding_left += base_padding_left + random.nextInt(range_padding_left);
padding_top = base_padding_top + random.nextInt(range_padding_top);
}
}
Call
// Display the verification code in the form of pictures
RegisteractivityShowcode.setImageBitmap(Code.getInstance().createBitmap());
realCode = Code.getInstance().getCode().toLowerCase();