androidstudio实现图形验证码
xml文件：
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
android:id="@+id/et_loginactivity_phoneCodes"
android:layout_width="80dp"
android:layout_height="50dp"
android:layout_marginLeft="50dp"
android:layout_marginRight="10dp"
android:layout_marginTop="20dp"
android:layout_weight="3"
android:hint="请输入四位验证"
android:textColor="#000000"
android:textColorHint="#bcbcbc" />
android:id="@+id/iv_loginactivity_showCode"
android:layout_width="95dp"
android:layout_height="63dp"
android:layout_marginTop="10dp"
android:layout_weight="1.5"
android:clickable="true"
/>
java文件：
(主活动代码)
private EditTextmEtloginactivityPhonecodes;
private ImageViewmIvloginactivityShowcode;
private StringrealCode;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mEtloginactivityPhonecodes = findViewById(R.id.et_loginactivity_phoneCodes);
mIvloginactivityShowcode = findViewById(R.id.iv_loginactivity_showCode);
mIvloginactivityShowcode.setImageBitmap(code.getInstance().createBitmap());
realCode = code.getInstance().getCode().toLowerCase(); //将验证码用图片的形式显示出来
mIvloginactivityShowcode.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mIvloginactivityShowcode.setImageBitmap(code.getInstance().createBitmap());
realCode = code.getInstance().getCode().toLowerCase(); //将验证码用图片的形式显示出来
}
});
login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String phoneCode =mEtloginactivityPhonecodes.getText().toString().toLowerCase();
if(phoneCode.length()==0){
Toast.makeText(MainActivity.this,"验证码不能为空",Toast.LENGTH_SHORT).show();
}
else if (!phoneCode.equals(realCode)){
Toast.makeText(MainActivity.this,"验证码错误",Toast.LENGTH_SHORT).show();
}
}
});
}
(随机生成图形验证码)
package com.example.smartcommunityv2;
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
* 去除了易混淆的 数字 0 和 字母 o O
* 数字 1 和 字母 i I l L
* 数字 6 和 字母 b
* 数字 9 和 字母 q
* 字母 c C 和 G
* 字母 t (经常和随机线混在一起看不清)
*/
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 codebmpCode;
public static codegetInstance() {
if(bmpCode ==null)
bmpCode =new code();
return bmpCode;
}
//default settings
//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;
//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 Stringcode;
private int padding_left, padding_top;
private Randomrandom =new Random();
//验证码图片
public BitmapcreateBitmap() {
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);
//画验证码
for (int i =0; i
randomTextStyle(paint);
randomPadding();
c.drawText(code.charAt(i) +"", padding_left, padding_top, paint);
}
//画线条
for (int i =0; i
drawLine(c, paint);
}
// c.save( Canvas.ALL_SAVE_FLAG );//保存
c.save();//保存
c.restore();//
return bp;
}
public StringgetCode() {
return code;
}
//生成验证码
private StringcreateCode() {
StringBuilder buffer =new StringBuilder();
for (int i =0; 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);
canvas.drawLine(startX, startY, stopX, stopY, paint);
}
//生成随机颜色
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);
}
//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);
}
}
