Android client Random verification code generation implementation

Because the verification code is used in the project, I found some information and tried to give it out. The code is not a lot and it is relatively simple, the following shows how I implemented this function:

 

 

 

First of all, write XML and paste the code.

Paste the MainActivity code below:

The comment in it is very detailed, so I will not talk about it much!

Import android. OS. bundle; import android. app. activity; import android. util. log; import android. view. menu; 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 {ImageView vc_image; // icon Button vc_shuaixi, vc_ OK; // confirm and refresh the verification code String GetCode = null; // obtain the value of the Verification Code EditText vc_code; // The value of the text box @ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); vc_image = (ImageView) findViewById (R. id. vc_image); vc_image.setImageBitmap (Code. getInstance (). getBitmap (); vc_code = (EditText) findViewById (R. id. vc_code); getCode = Code. getInstance (). getCode (); // obtain the displayed Verification Code Log. e (info, getCod E + ----); vc_shuaixi = (Button) findViewById (R. id. vc_shuaixi); vc_shuaixi.setOnClickListener (new OnClickListener () {@ Overridepublic void onClick (View v) {// TODO Auto-generated method stubvc_image.setImageBitmap (Code. getInstance (). getBitmap (); getCode = Code. getInstance (). getCode () ;}}); vc_ OK = (Button) findViewById (R. id. vc_ OK); vc_ OK .setOnClickListener (new OnClickListener () {@ Overridepublic void onClick (View V) {// TODO Auto-generated method stubStringv_code = vc_code.getText (). toString (). trim (); if (v_code = null | v_code.equals () {Toast. makeText (MainActivity. this, no verification code is entered, 2 ). show ();} else if (! V_code.equals (getCode) {Toast. makeText (MainActivity. this indicates that the verification code is incorrect. 2 ). show ();} else {Toast. makeText (MainActivity. this, operation successful, 2 ). show ();}}});}

Finally, paste a required class Code for the verification Code:

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 = {'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 Code bpUtil; private Code () {}; public static Code getInstance () {if (bpUtil = null) bpUtil = new Code (); return bpUtil;} // default settingsprivate static final int DEFAULT_CODE_LENGTH = 4; // The length of the verification code is 4-bit private static final int DEFAULT_FONT_SIZ E = 60; // font size private static final int DEFAULT_LINE_NUMBER = 3; // Number of interfering lines private static final int BASE_PADDING_LEFT = 20; // The left side is private static final int RANGE_PADDING_LEFT = 35; // The left side is private static final int BASE_PADDING_TOP = 42; // The top margin is private static final int RANGE_PADDING_TOP = 15; // The value of the top margin range is private static final int DEFAULT_WIDTH = 200; // The default width. the total width of the image is private static final int DEFAULT_HEIGHT = 70; // The default height. figure The total height of the slice is private final int DEFAULT_COLOR = 0xdf; // Default background color value // settings decided by the layout xml // canvas width and heightprivate int width = DEFAULT_WIDTH; private int height = DEFAULT_HEIGHT; // random word space and comment int base_padding_left = BASE_PADDING_LEFT; private int range_padding_left = RANGE_PADDING_LEFT; private int comment = comment; private int range_padding_top = RA Bytes; // number of chars, lines; font sizeprivate int codeLength = DEFAULT_CODE_LENGTH; private int line_number = DEFAULT_LINE_NUMBER; private int font_size = DEFAULT_FONT_SIZE; // variablesprivate String code; // Save the generated Verification Code private int padding_left, padding_top; private Random random = new Random (); private Bitmap createBitmap () {padding_left = 0; Bitmap bp = Bitmap. createBitmap (width, height, Confi G. 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 (Canva S. ALL_SAVE_FLAG); // save 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. nextI Nt (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 indicates bold, and false indicates non-bold float skewX = random. nextInt (11)/10; skewX = random. nextBoolean ()? SkewX:-skewX; paint. setTextSkewX (skewX); // float type parameter. A negative number indicates the Right oblique, and an integer indicates the left oblique. // paint. setUnderlineText (true); // true indicates the underline, and false indicates the non-Underline. // paint. setStrikeThruText (true); // true indicates strikethrough, and false indicates non-strikethrough.} private void randomPadding () {padding_left + = base_padding_left + random. nextInt (range_padding_left); padding_top = base_padding_top + random. nextInt (range_padding_top );}}

The Code has been pasted. Try again!