Utility class for generating image captcha:

Public class ImageCodeUtil {private static final char[] CHARS = {public static final char[] CHARS = {public 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' and 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'touch', 'buy' and 'touch'}; private static ImageCodeUtil mCodeUtils; private int mPaddingLeft, mPaddingTop; private StringBuilder mBuilder = new StringBuilder(); private Random mRandom = new Random(); //Default Settings private static final int DEFAULT_CODE_LENGTH = 4; Private static final int DEFAULT_FONT_SIZE = 65; private static final int DEFAULT_FONT_SIZE = 65; Private static final int DEFAULT_LINE_NUMBER = 2; private static final int DEFAULT_LINE_NUMBER = 2; Private static final int BASE_PADDING_LEFT =20; private static final int BASE_PADDING_LEFT =20; Private static final int RANGE_PADDING_LEFT = 30; private static final int RANGE_PADDING_LEFT = 30; Private static final int BASE_PADDING_TOP = 70; private static final int BASE_PADDING_TOP = 70; Private static final int RANGE_PADDING_TOP = 15; Private static final int DEFAULT_WIDTH = 300; Private static final int DEFAULT_HEIGHT = 100; private static final int DEFAULT_HEIGHT = 100; Private static final int DEFAULT_COLOR = 0xDF; // Default background color value private String code; public static ImageCodeUtil getInstance() { if (mCodeUtils == null) { mCodeUtils = new ImageCodeUtil(); } return mCodeUtils; Public Bitmap createBitmap() {mPaddingLeft = 0; // Initialize mPaddingTop = 0 each time a captcha image is generated; Bitmap bitmap = Bitmap.createBitmap(DEFAULT_WIDTH, DEFAULT_HEIGHT, Config.ARGB_8888); Canvas canvas = new Canvas(bitmap); code = createCode(); canvas.drawColor(Color.rgb(DEFAULT_COLOR, DEFAULT_COLOR, DEFAULT_COLOR)); Paint paint = new Paint(); paint.setTextSize(DEFAULT_FONT_SIZE); for (int i = 0; i < code.length(); i++) { randomTextStyle(paint); randomPadding(); canvas.drawText(code.charAt(i) + "", mPaddingLeft, mPaddingTop, paint); } for (int I = 0; i < DEFAULT_LINE_NUMBER; i++) { drawLine(canvas, paint); } canvas.save(Canvas.ALL_SAVE_FLAG); / / save canvas. Restore (); return bitmap; ** @return ** / public String getCode() {return code; } public String createCode() {mBuilder.delete(0, mBuilder.length()); For (int I = 0; i < DEFAULT_CODE_LENGTH; i++) { mBuilder.append(CHARS[mRandom.nextInt(CHARS.length)]); } return mBuilder.toString(); Private void drawLine(Canvas Canvas, Paint Paint) {int color = randomColor(); int startX = mRandom.nextInt(DEFAULT_WIDTH); int startY = mRandom.nextInt(DEFAULT_HEIGHT); int stopX = mRandom.nextInt(DEFAULT_WIDTH); int stopY = mRandom.nextInt(DEFAULT_HEIGHT); paint.setStrokeWidth(1); paint.setColor(color); canvas.drawLine(startX, startY, stopX, stopY, paint); } private int randomColor() {mBuilder.delete(0, mBuilder.length()); String haxString; for (int i = 0; i < 3; i++) { haxString = Integer.toHexString(mRandom.nextInt(0xFF)); if (haxString.length() == 1) { haxString = "0" + haxString; } mBuilder.append(haxString); } return Color.parseColor("#" + mBuilder.toString()); } private void randomTextStyle(Paint Paint) {int color = randomColor(); paint.setColor(color); paint.setFakeBoldText(mRandom.nextBoolean()); Float skewX = mrandom.nextint (11) / 10; float skewX = mrandom.nextint (11) / 10; skewX = mRandom.nextBoolean() ? skewX : -skewX; paint.setTextSkewX(skewX); SetUnderlineText (true); // True for underline, false for non-underline paint.setstrikethrutext (true); //true for delete line, Private void randomPadding() {mPaddingLeft += BASE_PADDING_LEFT + mRandom.nextInt(RANGE_PADDING_LEFT); mPaddingTop = BASE_PADDING_TOP + mRandom.nextInt(RANGE_PADDING_TOP); }}Copy the code

Image verification code implementation method: XML layout file to add for display image verification code Imageview control and input verification TextView, etc

et = (EditText) view.findViewById(R.id.et); imageCodeUtil = ImageCodeUtil.getInstance(); Bitmap bitmap = imageCodeUtil.createBitmap(); iv_code.setImageBitmap(bitmap); tv_fg1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // imageCodeUtil=ImageCodeUtil.getInstance(); Bitmap bitmap = imageCodeUtil.createBitmap(); iv_code.setImageBitmap(bitmap); If (et.getinputType ()==0x90){et.setinputType (0x81); }else {// et.setinputType (0x90); / /}}}); Iv_code.setonclicklistener (new view.onClickListener () {@override public void onClick(View v) {// Click the image to change the verification code  = imageCodeUtil.createBitmap(); iv_code.setImageBitmap(bitmap); }}); Sure_code.setonclicklistener (new view.onClickListener () {Override public void onClick(View v) {codeStr = et.getText().toString().trim(); String code = imageCodeUtil.getCode(); If (null = = codeStr | | TextUtils. IsEmpty (codeStr)) {Toast. MakeText (getActivity (), "please enter the verification code", Toast.LENGTH_SHORT).show(); return; } if (code.equalSignorecase (codeStr)) {toast.makeText (getActivity(), "correct ", toast.length_short).show(); } else {toast.makeText (getActivity(), "verification code error ", toast.length_short).show(); }}});Copy the code