在登錄或者注冊(cè)時(shí)，客戶端總有一個(gè)驗(yàn)證碼需要用戶填寫，自己在網(wǎng)上搜索了一些資料，便自己做了出來。

1，寫一個(gè)驗(yàn)證碼生成的類

public class Code {//隨機(jī)數(shù)數(shù)組 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 //驗(yàn)證碼默認(rèn)隨機(jī)數(shù)的個(gè)數(shù) private static final int DEFAULT_CODE_LENGTH = 4; //默認(rèn)字體大小 private static final int DEFAULT_FONT_SIZE = 25; //默認(rèn)線條的條數(shù) 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; //驗(yàn)證碼的默認(rèn)寬高 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 String code=""; private int padding_left, padding_top; private Random random = new Random(); //驗(yàn)證碼圖片 public Bitmap createBitmap(String code) {padding_left = 0; Bitmap bp = Bitmap.createBitmap(width, height, Config.ARGB_8888); Canvas c = new Canvas(bp); //驗(yàn)證碼從服務(wù)器獲取，而不是自己生成 // code = createCode(); this.code=code; c.drawColor(Color.WHITE); //如果沒有傳入字符，則只繪制背景 if (code.equals("")){}else {Paint paint = new Paint(); paint.setAntiAlias(true); paint.setTextSize(font_size); //畫驗(yàn)證碼 for (int i = 0; i < code.length(); i++) {randomTextStyle(paint); randomPadding(); c.drawText(code.charAt(i) + "", padding_left, padding_top, paint); }//畫線條 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; }//生成驗(yàn)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(); }//畫干擾線 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); }//生成隨機(jī)顏色 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); }//隨機(jī)生成文字樣式，顏色，粗細(xì)，傾斜度 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(shù)，負(fù)數(shù)表示右斜，整數(shù)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 }//隨機(jī)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); } }

其中,createBitmap(String code)是通過傳入字符串驗(yàn)證碼，字符串自己可以隨便寫一個(gè)函數(shù)生成，或者用code類的createCode（)生成隨機(jī)數(shù)，然后drawLine()是隨機(jī)在圖像上繪制多條橫線。

在activity隨時(shí)調(diào)用就可以了，然后設(shè)置imageview的背景iv_showCode.setImageBitmap(Code.getInstance().createBitmap("隨機(jī)數(shù)"));

就這么簡單。

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