Android surfaceview game development example

When we need to develop a complex gameProgramWhen the execution efficiency requirement is very high, the view class cannot meet the requirements. In this case, the surfaceview class must be used for development.

For example, when a game requires a high speed, the view class cannot meet the demand. In this case, you must use the surfaceview class for development. For example, a game with high speed requirements can be displayed using dual buffering. The background, characters, and animations in the game must be drawn on a canvas, while surfaceview can directly access a canvas, surfaceview is provided for applications that need to directly draw pixels rather than using form components. Each surface creates a canvas object (but its attributes are often changed) to manage the drawing operations on the view and surface.

Example:

Activity

Public class activity01 extends activity {</P> <p> gamesurfaceview gameview = NULL; </P> <p> @ override <br/> Public void oncreate (bundle savedinstancestate) {<br/> super. oncreate (savedinstancestate); </P> <p> gameview = new gamesurfaceview (this); <br/> setcontentview (gameview); <br/>}< br/>}

Gamesurfaceview

Public class gamesurfaceview extends surfaceview implements surfaceholder. callback, runnable {</P> <p> private activity01 mactivity = NULL; </P> <p> private surfaceholder mholder = NULL; <br/> private thread mthread = NULL; <br/> private Boolean mloop = false; </P> <p> private canvas mcanvas = NULL; <br/> private paint mpaint = NULL; <br/> private long drawstarttime = 0, drawcosttime = 0, drawtotaltime = 30; </ P> <p> private float X, Y; <br/> private int screenwidth = 480, screenheight = 800; </P> <p> Public gamesurfaceview (context) {<br/> super (context); </P> <p> mactivity = (activity01) context; </P> <p> mholder = This. getholder (); <br/> mholder. addcallback (this); <br/> setfocusable (true); <br/>}</P> <p> @ override <br/> Public void surfacecreated (surfaceholder holder) {<br/> mpaint = new paint (); <br/> mpaint. se Tcolor (color. cyan); <br/> mloop = true; </P> <p> New thread (this ). start (); <br/>}</P> <p> @ override <br/> Public void surfacechanged (surfaceholder holder, int format, int width, int height) {<br/> screenwidth = width; <br/> screenheight = height; </P> <p> X = screenwidth/2; <br/> Y = screenheight/2; <br/>}</P> <p> @ override <br/> Public void surfacedestroyed (surfaceholder holder) {<br/> mloop = false; <br/>} </P> <p> @ override <br/> Public void run () {<br/> while (mloop) {<br/> drawstarttime = systemclock. uptimemillis (); </P> <p> synchronized (mholder) {<br/> try {<br/> mcanvas = mholder. lockcanvas (); <br/> ondraw (); // repaint <br/>} catch (exception e) {<br/> E. printstacktrace (); <br/>}finally {<br/> If (mcanvas! = NULL) {<br/> mholder. unlockcanvasandpost (mcanvas); <br/>}</P> <p> drawcosttime = systemclock. uptimemillis ()-drawstarttime; <br/> log. I ("drawcosttime", "drawcosttime =" + drawcosttime); <br/> try {<br/> If (drawcosttime <drawtotaltime) {<br/> thread. sleep (drawtotaltime-drawcosttime); // sleep elapse time <br/>}< br/>} catch (exception e) {<br/> E. printstacktrace (); <br/>}</P> <p> private void ondraw () {<br/> If (mholder = NULL & mpaint = NULL) {<br/> return; <br/>}</P> <p> mpaint. setantialias (true); <br/> mpaint. setalpha (100); </P> <p> mpaint. setcolor (color. cyan); // paint background color <br/> mcanvas. drawrect (0, 0, screenwidth, screenheight, mpaint); </P> <p> mpaint. setcolor (color. blue); // paint foreground color <br/> mcanvas. drawcircle (X, Y, 50, mpaint); <br/>}</P> <p> @ override <br/> Public Boolean ontouchevent (motionevent event) {<br/> super. ontouchevent (event); </P> <p> switch (event. getaction () {<br/> case motionevent. action_down: <br/> This. X = event. getx (); <br/> This. y = event. gety (); <br/> break; </P> <p> case motionevent. action_move: <br/> This. X = event. getx (); <br/> This. y = event. gety (); <br/> break; </P> <p> case motionevent. action_up: <br/> This. X = event. getx (); <br/> This. y = event. gety (); <br/> break; </P> <p> default: <br/> This. X = event. getx (); <br/> This. y = event. gety (); <br/> break; <br/>}</P> <p> return true; // true then event can be implemented again <br/>}</P> <p> @ override <br/> Public Boolean onkeydown (INT keycode, keyevent event) {<br/> super. onkeydown (keycode, event); </P> <p> If (keycode = keyevent. action_down) {<br/> This. mactivity. finish (); <br/>}</P> <p> return true; <br/>}< br/>}
Running effect:

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