手机端产生本地图形验证码

package com.chao.createcode;
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', '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 = 4;
private static final int DEFAULT_FONT_SIZE = 25;
private static final int DEFAULT_LINE_NUMBER = 2;
private static final int BASE_PADDING_LEFT = 10, RANGE_PADDING_LEFT = 15, BASE_PADDING_TOP = 15, RANGE_PADDING_TOP = 20;
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();
//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);
}
}

package com.chao.createcode;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener {
private ImageView iv_showCode;
private EditText et_phoneCode;
private EditText et_phoneNum;
//产生的验证码
private String realCode;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

et_phoneCode = (EditText) findViewById(R.id.et_phoneCodes);
Button but_toSetCode = (Button) findViewById(R.id.but_forgetpass_toSetCodes);
but_toSetCode.setOnClickListener(this);
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());
realCode = Code.getInstance().getCode();
iv_showCode.setOnClickListener(this);

}
@Override
public void onClick(View v) {

switch (v.getId()) {
case R.id.iv_showCode:
iv_showCode.setImageBitmap(Code.getInstance().createBitmap());
realCode = Code.getInstance().getCode();
System.out.println(realCode);
break;
case R.id.but_forgetpass_toSetCodes:

String phoneCode = et_phoneCode.getText().toString();
if(phoneCode.equalsIgnoreCase(realCode)){
Toast.makeText(MainActivity.this, phoneCode+"验证码正确", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(MainActivity.this, phoneCode+"验证码错误", Toast.LENGTH_SHORT).show();
}
break;
}

}

}

<?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" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="@color/main_color_white" >

<TextView
android:id="@+id/tv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="找回密码"
android:textColor="@color/loan_butBackground"
android:textSize="20sp" />

</RelativeLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_marginTop="30dp"
android:orientation="vertical"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:background="@drawable/linearlayout01">

<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_vertical"
android:orientation="horizontal" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:text="中国+86"
android:textColor="#A2CD5A"
android:textSize="16sp" />
<View
android:layout_width="0.1dp"
android:layout_height="match_parent"
android:background="@color/loan_butBackground" />
<EditText
android:id="@+id/et_forgetPass_PhoneNum"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:background="@null"
android:digits="0123456789"
android:hint="请填入您的手机号"
android:inputType="number"
android:maxLength="11"
android:textSize="16sp" />
</LinearLayout>
</LinearLayout>

<LinearLayout

android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:layout_marginTop="20dp"
android:orientation="horizontal" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="40dp"
android:background="@drawable/linearlayout01" >
<EditText
android:id="@+id/et_phoneCodes"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:background="@null"
android:hint="请输入右侧验证码" />
</LinearLayout>
<ImageView
android:id="@+id/iv_showCode"
android:layout_width="100dp"
android:layout_marginLeft="10dp"
android:layout_height="match_parent" />

</LinearLayout>
<Button
android:id="@+id/but_forgetpass_toSetCodes"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:background="@drawable/buttonshape"
android:text="获取手机验证码"
android:textColor="@color/main_color_white" />
</LinearLayout>