Android Verification Code implementation, detailed labeling!

Reprint please indicate the source: Wang 亟亟 's way of Daniel

The last blog post wrote a generation of two-dimensional code, this one to a random number.
Package Directory

Operating effect:

is to draw a bunch of things and put them in ImageView.
Words do not say more directly on the code:

 Public  class mainactivity extends Activity {ProgressDialog Mloadingdialog;    Button Showcaptchad;    ImageView ImageView; Bitmap Validatecodeimage;@Override    protected void onCreate(Bundle savedinstancestate) {Super. OnCreate (Savedinstancestate);        Setcontentview (R.layout.activity_main);        imageview= (ImageView) Findviewbyid (R.id.imageview);        Showcaptchad= (Button) Findviewbyid (R.id.showcaptchad); Showcaptchad.setonclicklistener (NewOnclicklistener () {@Override             Public void OnClick(View v) {Showloadingdialog ("Loading ...");//Recycling bitmap                if(NULL! = Validatecodeimage &&!validatecodeimage.isrecycled ()) {validatecodeimage.recycle (); Validatecodeimage =NULL; }//Generate picturesValidatecodeimage =makevalidatecode ( $, -);                Imageview.setimagebitmap (Validatecodeimage); Toast.maketext (mainactivity. This,"Verification Code generation succeeded"+"Verification Code is"+gainvalidatecodevalue (), Toast.length_short). Show ();            Dismissloadingdialog ();    }        }); }/ * Show dialog box * /     Public void Showloadingdialog(String msg) {if(Mloadingdialog! =NULL&& mloadingdialog.isshowing ()) {return; } Mloadingdialog =NewProgressDialog ( This); Mloadingdialog.setmessage (msg);//Mloadingdialog.setonkeylistener (Monkeylistener);        //Mloadingdialog.setcancelable (false);Mloadingdialog.show (); }/** * Cancel Load dialog box * /     Public void Dismissloadingdialog() {if(Mloadingdialog! =NULL) {Mloadingdialog.dismiss (); }    }@Override     Public Boolean Oncreateoptionsmenu(Menu menu) {//inflate the menu; This adds items to the action bar if it is present.Getmenuinflater (). Inflate (R.menu.main, menu);return true; }@Override     Public Boolean onoptionsitemselected(MenuItem Item) {//Handle Action Bar item clicks here. The Action Bar would        //automatically handle clicks on the Home/up button, so long        //As you specify a parent activity in Androidmanifest.xml.        intid = item.getitemid ();if(id = = r.id.action_settings) {return true; }return Super. onoptionsitemselected (item); }/** * Get captcha Picture * @param Width Verification code Width * @param Height Verification code Height * @return Verification Code BITMA P Object * /     Public synchronized StaticBitmapMakevalidatecode(intWidthintHeight) {returnValidatecodegenerator.createbitmap (width, height); }/** * Get Verification code value * @return captcha string */     Public synchronized StaticStringGainvalidatecodevalue(){returnValidatecodegenerator.getcode (); }/** * Randomly generated verification code inner class * * /    Final StaticClass validatecodegenerator{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 ',        };//default Settings        Private Static Final intDefault_code_length =4;Private Static Final intDefault_font_size = -;Private Static Final intDefault_line_number =3;//number of lines of clutter        Private Static Final intBase_padding_left = the, Range_padding_left =Ten, Base_padding_top = *, Range_padding_top = -;Private Static Final intDefault_width = -, Default_height = -;//variables        Private StaticString value;Private Static intPadding_left, Padding_top;Private StaticRandom random =NewRandom (); Public StaticBitmapCreateBitmap(intWidthintHeight) {Padding_left =0;//Create canvasBitmap BP = bitmap.createbitmap (width, height, config.argb_8888); Canvas C =NewCanvas (BP);//randomly generate CAPTCHA charactersStringBuilder buffer =NewStringBuilder (); for(inti =0; i < default_code_length;            i++) {buffer.append (Chars[random.nextint (chars.length)]); } value = Buffer.tostring ();//Set colorC.drawcolor (Color.White);//Set Brush sizePaint paint =NewPaint (); Paint.settextsize (default_font_size); for(inti =0; I < value.length (); i++) {//Random styleRandomtextstyle (paint);                Padding_left + = Base_padding_left + random.nextint (range_padding_left);                Padding_top = Base_padding_top + random.nextint (range_padding_top); C.drawtext (Value.charat (i) +"", Padding_left, padding_top, paint); } for(inti =0; i < Default_line_number;            i++) {DrawLine (c, paint); }//SaveC.save (Canvas.all_save_flag); C.restore ();returnbp } Public StaticStringGetCode() {returnValue }Private Static void Randomtextstyle(Paint paint) {intcolor = Randomcolor (1);            Paint.setcolor (color); Paint.setfakeboldtext (Random.nextboolean ());//true is bold, false is not bold            floatSkewx = Random.nextint ( One) /Ten; Skewx = Random.nextboolean ()?            SKEWX:-skewx; Paint.settextskewx (SKEWX);//float type parameter, negative number for right oblique, integer left obliquePaint.setunderlinetext (true);//true is underlined, false is non-underlinedPaint.setstrikethrutext (true);//true for Strikethrough, false for non-strikethrough}Private Static void DrawLine(Canvas canvas, paint paint) {intcolor = Randomcolor (1);intStartX = Random.nextint (default_width);intStarty = Random.nextint (default_height);intSTOPX = Random.nextint (default_width);intStopy = Random.nextint (default_height); Paint.setstrokewidth (1);            Paint.setcolor (color);        Canvas.drawline (StartX, Starty, stopx, stopy, paint); }Private Static int Randomcolor(intRate) {intRed = Random.nextint ( the)/rate;intGreen = Random.nextint ( the)/rate;intBlue = Random.nextint ( the)/rate;returnColor.rgb (red, green, blue); }    }@Override    protected void OnDestroy() {//TODO auto-generated method stub    Super. OnDestroy ();if(NULL! = Validatecodeimage &&!validatecodeimage.isrecycled ()) {validatecodeimage.recycle (); Validatecodeimage =NULL;    } System.GC (); }}

Layout file:

<Relativelayout xmlns:android="Http://schemas.android.com/apk/res/android"    Xmlns:tools="Http://schemas.android.com/tools"    Android:layout_width="Match_parent"    Android:layout_height="Match_parent"    Android:paddingbottom="@dimen/activity_vertical_margin"    Android:paddingleft="@dimen/activity_horizontal_margin"    Android:paddingright="@dimen/activity_horizontal_margin"    Android:paddingtop="@dimen/activity_vertical_margin"    Tools:context="Com.example.captchademo.MainActivity">    <buttonandroid:id="@+id/showcaptchad"android:layout_width="Wrap _content "android:layout_height=" Wrap_content "android:layout_alignparenttop ="true"android:layout_centerhorizontal="true"android:text=" Showcaptchad " />                                                    <ImageViewandroid:id= "@+id/imageview"android:layout_width=" 200DP "android:layout_height="wrap_content "android:layout_below=" @+id/ Showcaptchad "android:layout_centerhorizontal=" true "android:minheight= "150DP" />                                                </relativelayout>

You can manipulate properties in an internal class if you want to modify them.
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Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

Android Verification Code implementation, detailed labeling!