Surface instance-Small ball bounce case

Ball.java

Package Com.example.sufacedemo;import Android.graphics.bitmap;import Android.graphics.bitmapfactory;import Android.graphics.canvas;import Android.graphics.color;import Android.graphics.paint;import Android.util.DisplayMetrics; /** * Balls * @author ZCL * */public class Ball {/** * balls high */public static FINA         l int HEIGHT = 93;         /** * Ball Width */public static final int width = 93;         private static final int steplength = 10;//interval for each motion private static final float Reducepercentage = 0.35f;//decrement factor         private int stepreduce;//The shortened distance of each inverse movement private float runX;//Ball position private float runy;//Ball position         Private Ballsurfaceview BSV; Private Boolean updirection = false;//if true,up direction,or is down direction private float maxheight;//Current highest movement                 Highly private paint paint;         Bitmap ballbitmap;//Picture of the ball sportactivity sa; Public Ball (Float INITX, float inity, Ballsurfaceview bsv) {this.runx = INITX;                   This.runy = inity;                   MaxHeight = inity;                   THIS.BSV = BSV; Ballbitmap = Bitmapfactory.decoderesource (Bsv.getresources (), r.drawable.ball);//Load picture paint = new Paint (                   );         SA = bsv.sportactivity;                   public void OnDraw (canvas canvas) {int c = Paint.getcolor ();//Save color, then revert to previous color                   Boundarytest ();                   if (canvas! = null) Canvas.drawbitmap (ballbitmap,runx,runy,paint);                   Paint.setcolor (c);         Move (); }/** * Motion * * private void Move () {if (MaxHeight >= (Sa.screenheigh                   T-height)) {return;                   } if (updirection) {//Up Runy = Runy + steplength;     }else{                       Runy = Runy-steplength; }}/** * Bounds detection so that the ball does not fly out of bounds */private void Boundarytest () {if (R                            UnY > Sa.screenheight-height) {//down motion head updirection =!updirection;//direction Reverse                            Runy = Sa.screenheight-height;                            Stepreduce = (int) (maxheight * reducepercentage);  MaxHeight = MaxHeight + stepreduce;//maximum height decrement} if (Runy <  MaxHeight) {//up motion head updirection =!updirection;//direction reverse if (maxheight                            >= (Sa.screenheight-height)) return;                                              Runy = MaxHeight; }         }}

　　

Ballsurfaceview

Package Com.example.sufacedemo;import Android.annotation.suppresslint;import Android.content.context;import Android.graphics.canvas;import Android.graphics.color;import Android.graphics.paint;import Android.view.surfaceholder;import Android.view.surfaceview;public class Ballsurfaceview extends SurfaceView Implementssurfaceholder.callback {sportactivity sportactivity;//invokes the context reference of this surfaceview private ball ball;// Small ball Surfaceholder Holder;public Ballsurfaceview (context context) {super (context); this.sportactivity = (sportactivity) Context;ball = new Ball (+, this); holder = This.getholder (); Holder.addcallback (this);} @SuppressLint ("Wrongcall") @Overrideprotected void OnDraw (canvas canvas) {super.ondraw (canvas); if (canvas = = null)  Canvas = Holder.lockcanvas ();//Lock canvas Paint p = new Paint (); int c = P.getcolor ();p. SetColor (Color.White);//Set Background white if (canvas ! = null) canvas.drawrect (0, 0, sportactivity.screenwidth,sportactivity.screenheight, p);p. SetColor (c); Ball.onDraw ( Canvas); Holder.unlockcanvasandPost (Canvas),//release lock} @Overridepublic void Surfacechanged (surfaceholder holder, int format, int width,int height) {}@ overridepublic void surfacecreated (Surfaceholder holder) {new Refreshthread (). Start (); @Overridepublic void surfacedestroyed (Surfaceholder holder) {}private Class Refreshthread extends Thread {@SuppressLint ("Wrongcall") @Overridepublic void Run () {while (true) {Canvas canvas = null;try {onDraw (canvas);} catch (Exception e) {E.P Rintstacktrace ();} try {thread.sleep;} catch (Interruptedexception e) {e.printstacktrace ();}}}}

　　

Sportactivity.java

Package Com.example.sufacedemo;import Android.os.bundle;import Android.app.activity;import android.view.Menu; Import Android.app.activity;import Android.content.pm.activityinfo;import Android.os.bundle;import Android.util.displaymetrics;import Android.view.window;import Android.view.WindowManager;         public class Sportactivity extends Activity {public int screenwidth;         public int screenheight;    Ballsurfaceview BSV; /** called when the activity is first created.        */@Override public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        BSV = new Ballsurfaceview (this);        Get screen size displaymetrics dm = new Displaymetrics ();              DM = This.getapplicationcontext (). Getresources (). Getdisplaymetrics ();              ScreenWidth = Dm.widthpixels;            ScreenHeight = Dm.heightpixels;                   The next two sentences are set to full screen requestwindowfeature (window.feature_no_title); GetWindow (). SetFlags (WindOwManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);    Setcontentview (BSV); }}

　　

Surface instance-Small ball bounce case