Examples of surfaceview in Android

Surfaceview plays an important role in game development. It has a greater degree of freedom for Screen Control (unlike view update with handler, about view ), however, there are not many references in this regard. The examples that can be found are a bit overwhelming and cannot be clearly displayed. The following is a simple example, strive to clearly display the process, while others can be simplified.

 

Program effect: Draw a blue rectangle with a thread.

Java code {
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1. Package com. Ray. test;
2. /*
3. * Surfaceview sample program
4. * Demonstrate the process
5. */
6. Import Android. App. activity;
7. Import Android. content. context;
8. Import Android. Graphics. Canvas;
9. Import Android. Graphics. color;
10. Import Android. Graphics. paint;
11. Import Android. Graphics. rectf;
12. Import Android. OS. Bundle;
13. Import Android. View. surfaceholder;
14. Import Android. View. surfaceview;
16. Public class test extends activity {
17. Public void oncreate (bundle savedinstancestate ){
18. Super. oncreate (savedinstancestate );
19. Setcontentview (New myview (this ));
20. }
22. // Internal class
23. Class myview extends surfaceview implements surfaceholder. Callback {
25. Surfaceholder holder;
26. Public myview (context ){
27. Super (context );
28. Holder = This. getholder (); // Get holder
29. Holder. addcallback (this );
30. // Setfocusable (true );
32. }
34. @ Override
35. Public void surfacechanged (surfaceholder holder, int format, int width,
36. Int height ){
38. }
40. @ Override
41. Public void surfacecreated (surfaceholder holder ){
42. New thread (New mythread (). Start ();
43. }
45. @ Override
46. Public void surfacedestroyed (surfaceholder holder ){
48. }
50. // Internal class of the internal class
51. Class mythread implements runnable {
53. @ Override
54. Public void run (){
55. Canvas canvas = holder. lockcanvas (null); // get the canvas
56. Paint mpaint = new paint ();
57. Mpaint. setcolor (color. Blue );
59. Canvas. drawrect (New rectf (40, 60, 80), mpaint );
60. Holder. unlockcanvasandpost (canvas); // unlock the canvas and submit the painted image
62. }
64. }
66. }
67. }

Package COM. ray. test;/** the surfaceview sample program * demonstrates the process */import android. app. activity; import android. content. context; import android. graphics. canvas; import android. graphics. color; import android. graphics. paint; import android. graphics. rectf; import android. OS. bundle; import android. view. surfaceholder; import android. view. surfaceview; public class test extends activity {public void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (New myview (this);} // internal class myview extends surfaceview implements surfaceholder. callback {surfaceholder holder; Public myview (context) {super (context); holder = This. getholder (); // get holderholder. addcallback (this); // setfocusable (true) ;}@ overridepublic void surfacechanged (surfaceholder holder, int format, int width, int height) {}@ overridepublic void surfacecreated (surfaceholder holder) {New thread (New mythread ()). start () ;}@ overridepublic void surfacedestroyed (surfaceholder holder) {}// internal class mythread implements runnable {@ overridepublic void run () {canvas = holder. lockcanvas (null); // obtain the canvas paint mpaint = new paint (); mpaint. setcolor (color. blue); canvas. drawrect (New rectf (40, 60, 80), mpaint); holder. unlockcanvasandpost (canvas); // unlock the canvas and submit the painted image }}}}

 

• Testsurfaceview0.1.rar (25.6 KB)