Simple use of Surfaceview for Android game development

Reference: zero-based Android game programming

  Related knowledge points: 1, callback    a surfaceview must implement a Surfaceholder.callback interface. To notify view when the underlying surface state changes, the interface needs to implement the following 3 methods:    public void surfacecreated ( Surfaceholder holder)  {}   public void surfacechanged (SurfaceHolder  Holder, int format, int width, int height) {}   public void  surfacedestroyed (Surfaceholder holder)  {}   2, surfaceholder        This is an interface for controlling surface, it provides control of surface  size, format, etc.    surfaceview Getholder () The function can get the Surfaceholder object,surface  within the Surfaceholder object.       3, specific code  MySurfaceView.javapackage cn.llbb.testsurfaceviewdemo; import android.content.context;import android.graphics.canvas;import android.graphics.color; Import android.graphics.paint;import android.graphics.path;import android.graphics.rect;import  android.graphics.rectf;import android.view.surfaceholder;import android.view.surfaceholder.callback; import android.view.surfaceview;public class mysurfaceview extends surfaceview  Implements callback {private surfaceholder sfh;private canvas canvas;private  paint paint;public mysurfaceview (Context context)  {super (Context);sfh =  Getholder (); Sfh.addcallback (this);p aint = new paint ();p aint.setcolor (color.red); SetFocusable ( true);} Public void surfacecreated (Surfaceholder holder)  {mydraw ();} Public void surfacechanged (Surfaceholder holder, int format, int width,  int height)  {}public void surfacedestroyed (surfaceholder holder)  {}private  void mydraw () {Try{canvas = sfh.lockcanvas (); if (canvas != null) {Canvas.drawColor (Color.White); Canvas.drawtext ("DrawText",  10,  10, paint); Canvas.drawpoint (10, 20, paint); Canvas.drawpoints (new float[]{ 10,30,30,30}, paint); Canvas.drawline (10,40,50,40, paint); Canvas.drawlines (new float[]{ 10,50,50,50,70,50,110,50}, paint); Canvas.drawrect (10,60,40,100, paint); Rect rect = new rect (10,110,60,130); Canvas.drawrect (Rect, paint); RECTF RECTF = NEW RECTF (10,140,60,170); Canvas.drawroundrect (rectf, 20, 20,  paint); canvas.drawcircle (20, 200, 20, paint); Canvas.drawarc (NEW RECTF (150,20,200,70),  0, 230, true, paint); Canvas.drawoval (NEW RECTF (150,80,180,100),  paint); Path path = new path ();p Ath.moveto (160,150);p Ath.lineto (200,150);p Ath.lineto (180,200); Path.close (); Canvas.drawpath (Path, paint); Path pathcircle = new path ();p athcircle.addcircle (130, 260, 20,  Path.Direction.CCW); Canvas.drawtextonpath ("Pathtext", Pathcircle, 10, 20, paint);}} catch (exception e) {}finally{sfh.unlockcanvasandpost (canvas);}}} mainactivity.javapackage cn.llbb.testcanvasdemo;import android.app.activity;import  android.os.bundle;import android.view.menu;import android.view.menuitem;import  Android.view.window;import android.view.windowmanager;public class mainactivity extends  activity {protected void oncreate (bundle savedinstancestate)  {super.onCreate ( Savedinstancestate); requestwindowfeature (Window.feature_no_title);//getwindow (). SetFlags ( Windowmanager.layoutparams.flag_fullscreen, windowmanager.layoutparams.flag_fullscreen); SetContentView ( New mysurfaceview (this));}}:

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Simple use of Surfaceview for Android game development