Android Mini-game----Sudoku (ii)

> First create a view class of your own

 --> inherit Surfaceview and implement Surfaceholder.callback interface   --> Surfaceview.getholder () to get Surfaceholder object   -->surfaceholder.addcallback (callback) Add callback function  -->surfaceholder.lockcanvas () Get Canvas objects and lock canvas  --> canvas painting   -->surfaceholder.unlockcanvasandpost (canvas canvas) end Lock and commit changes , the graphic is displayed.       public class Gamesfview extends Surfaceview implements callback{     Private Surfaceholder surfaceholder;    private int selectedx = 0;        privat e int selectedy = 0;   /**     * cell width      */    Private float width;& nbsp      /**     * cell height       */    Private float height;& nbsp  /**     *main.xml This Surfaceview class construction method must use the form of two formal parameters       */    Public Gamesfview (context context, AttributeSet attrs) {        Super (context, Attrs);        Surfaceholder = This.getholder (); Get Surfaceholder objects        //monitor the life cycle of your surface   give Surfaceview the current holder a callback object.         Surfaceholder.addcallback (this); Add callback            }}  implement three callback functions  //trigger when surface size changes     @ override    public void surfacechanged (surfaceholder holder, int format, int width, int height) {    & nbsp      }    //Fires at creation time, typically calling paint threads here.    //best to open the drawing thread when surface is created.     //Sub-threading drawing cache to surface     @Override     public void surfacecreated (Surfaceholder Holder) {        Draw ();   }    //Destroy when fired, typically here will draw the thread to stop, release.    /preferably destroy the drawing thread     @Override     public void surfacedestroyed (Surfaceholder) when surface is destroyed Holder) {    }    Custom Drawing Method   /**     * Custom drawing methods      */    public void Draw () {      &N Bsp Synchronized (Surfaceholder) {           //Get Canvas object           &NBS P Lock the canvas, usually after it is locked, it can be drawn through canvas objects it returns, drawing on it, and so on.             Canvas canvas = null;            Paint paint = new Paint ();            try{                canvas = su Rfaceholder.lockcanvas (); Lock-in canvas                              (=) nbsp Clear screen draw background                 Initgameview (canvas, paint);      &NBSP ;        //Redraw Surfaceview fill new data                 Inflatenewnum (c Anvas,paint);           }CATCH (Exception e) {                e.printstacktrace ();        &N Bsp  }finally{                if (canvas! = null)         &NBS P      //End lock drawing and submit changes.                 surfaceholder.unlockcanvasandpost (canvas);  //unlock canvas, update            }       }       }& nbsp; it is best to use synchronous locks, and to use try Catch finally for exception trapping.     private void Initgameview (Canvas canvas,paint Paint) {       //BGBITMAP = Bitmapfactory.decoderesource (Getresources (), R.drawable.background);       //init game background         INITGAMEBG (canvas,paint);       //Initialize game lines         Initgameli NE (canvas,paint);       /Initialize game data         INITFIRSTNUMBER (canvas,paint);           }    draw lines on the board private void Initgameline ( Canvas canvas,paint Paint) {       /Set brush color         Paint.setcolor (Color.Black); nbsp             //Draw horizontal         for (int i=1;i<10;i++) {    & nbsp                  canvas.drawline (0, I*height, getwidth (), i*height, paint); &n Bsp      }       //Draw vertical line         for (int i=1;i<9;i++) {                       Canvas.drawline (i*height,0, I*height,getwidth (), Pai NT);       }       //Draw three-way horizontal line         paint.setstrokewidth (4); nbsp       for (int i=1;i<4;i++) {            canvas.drawline (0, I*height*3, GETW Idth (), I*height*3, paint);       }       //Draw three-way vertical line         for (int i =1;i<9;i++) {                       Canvas.drawline (I*heigh t*3,0, I*height*3,getwidth (), paint);       }   } 

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Android Mini-game----Sudoku (ii)