先上效果图:
自定义VerificationCode 类。
public class VerificationCode {
private static final char[] CHARS = { '0', '1', '2', '3', '4', '5', '6',
'7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
'k', 'l', 'm', 'n', 'o', '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', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
'X', 'Y', 'Z' };
private static VerificationCode bpUtil;
private VerificationCode() {
};
public static VerificationCode getInstance() {
if (bpUtil == null)
bpUtil = new VerificationCode();
return bpUtil;
}
private static final int DEFAULT_CODE_LENGTH = 4;
private static final int DEFAULT_FONT_SIZE = 60;
private static final int DEFAULT_LINE_NUMBER = 3;// 多少条干扰线
private static final int BASE_PADDING_LEFT = 20; // 左边距
private static final int RANGE_PADDING_LEFT = 35;// 左边距范围值
private static final int BASE_PADDING_TOP = 42;// 上边距
private static final int RANGE_PADDING_TOP = 15;// 上边距范围值
private static final int DEFAULT_WIDTH = 200;
private static final int DEFAULT_HEIGHT = 70;
private final int DEFAULT_COLOR = 0xdf;// 默认背景颜色值
private int width = DEFAULT_WIDTH;
private int height = DEFAULT_HEIGHT;
private int base_padding_left = BASE_PADDING_LEFT;
private int range_padding_left = RANGE_PADDING_LEFT;
private int base_padding_top = BASE_PADDING_TOP;
private int range_padding_top = RANGE_PADDING_TOP;
private int codeLength = DEFAULT_CODE_LENGTH;
private int line_number = DEFAULT_LINE_NUMBER;
private int font_size = DEFAULT_FONT_SIZE;
private String code;// 保存生成的验证码
private int padding_left, padding_top;
private Random random = new Random();
private Bitmap createBitmap() {
padding_left = 0;
Bitmap bp = Bitmap.createBitmap(width, height, Config.ARGB_8888);
Canvas c = new Canvas(bp);
code = createCode();
c.drawColor(Color.rgb(DEFAULT_COLOR, DEFAULT_COLOR, DEFAULT_COLOR));
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.toLowerCase();
}
public Bitmap getBitmap() {
return createBitmap();
}
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
}
private void randomPadding() {
padding_left += base_padding_left + random.nextInt(range_padding_left);
padding_top = base_padding_top + random.nextInt(range_padding_top);
}
}
如何使用:
调用 VerificationCode.getInstance().getBitmap() 赋予imageview即可显示验证码.
例如:
ImageView vc_image = (ImageView) findViewById(R.id.vc_image);
vc_image.setImageBitmap(VerificationCode.getInstance().getBitmap());