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生成圖形驗證碼校驗類
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();
//驗證碼圖片
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;
}
//驗證碼
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為粗體，false為非粗體
float skewX = random.nextInt(11) / 10;
skewX = random.nextBoolean() ? skewX : -skewX;
paint.setTextSkewX(skewX); //float類型參數，負數表示右斜，整數左斜
// paint.setUnderlineText(true); //true為下劃線，false為非下劃線
// paint.setStrikeThruText(true); //true為刪除線，false為非刪除線
}
private void randomPadding() {
padding_left += base_padding_left + random.nextInt(range_padding_left);
padding_top = base_padding_top + random.nextInt(range_padding_top);
}
}Activity代碼
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;
//產生的驗證碼
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);
//將驗證碼用圖片的形式顯示出來
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+"驗證碼正確", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(MainActivity.this, phoneCode+"驗證碼錯誤", Toast.LENGTH_SHORT).show();
}
break;
}
}
}布局XML
