Three timer implementation methods for Android

Method 1: Handler + thread

[Java]
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1. Package com. xunfang. handerdemo;
   
3. Import Android. App. activity;
   
4. Import Android. OS. Bundle;
5. Import Android. OS. Handler;
   
6. Import Android. OS. message;
7. Import Android. widget. textview;
   
9. /**
10. * Handler Timer
11. *
12. * @ Author smalt
13. *
14. */
15. Public class handerdemoactivity
    Extends activity {
16. Textview TVshow;
17. Private int I =
    0;
19. @ Override
20. Public void oncreate (bundle savedinstancestate ){
    
21. Super. oncreate (savedinstancestate );
    
22. Setcontentview (R. layout. Main );
23. TVshow = (textview) findviewbyid (R. Id. TV _show );
24. New thread (New threadshow (). Start ();
    
25. }
27. // Handler class receives data
28. Handler handler = new handler (){
    
29. Public void handlemessage (Message MSG ){
    
30. If (msg. What = 1 ){
    
31. TVshow. settext (integer. tostring (I ++ ));
32. System. Out. println ("receive ....");
    
33. }
34. };
35. };
37. // Thread class
38. Class threadshow implements runnable {
    
40. @ Override
41. Public void run (){
    
42. // Todo auto-generated method stub
    
43. While (true ){
    
44. Try {
45. Thread. Sleep (1000 );
    
46. Message MSG = new message ();
47. MSG. What = 1;
48. Handler. sendmessage (MSG );
49. System. Out. println ("send ...");
    
50. } Catch (exception e ){
51. // Todo auto-generated Catch Block
    
52. E. printstacktrace ();
53. System. Out. println ("thread error ...");
    
54. }
55. }
56. }
57. }
58. }

Package COM. xunfang. handerdemo; import android. app. activity; import android. OS. bundle; import android. OS. handler; import android. OS. message; import android. widget. textview;/*** handler timer ** @ author smalt **/public class handerdemoactivity extends activity {textview TVshow; private int I = 0; @ overridepublic void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. main); TVshow = (textview) findviewbyid (R. id. TV _show); New thread (New threadshow ()). start () ;}// handler class receives data handler = new handler () {public void handlemessage (Message MSG) {If (MSG. what = 1) {TVshow. settext (integer. tostring (I ++); system. out. println ("receive .... ") ;}};}; // Thread class threadshow implements runnable {@ overridepublic void run () {// todo auto-generated method stubwhile (true) {try {thread. sleep (1000); message MSG = new message (); MSG. what = 1; handler. sendmessage (MSG); system. out. println ("send... ");} catch (exception e) {// todo auto-generated catch blocke. printstacktrace (); system. out. println ("thread error... ");}}}}}

Method 2: postdelyed of the handler class

[Java]
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1. Package com. xunfang. handerdemo;
   
3. Import Android. App. activity;
   
4. Import Android. OS. Bundle;
5. Import Android. OS. Handler;
   
6. Import Android. widget. textview;
   
8. /**
9. * Handler timer is implemented using postdelyed
10. *
11. * @ Author smalt
12. *
13. */
14. Public class handerdemoactivity
    Extends activity {
15. Textview TVshow;
16. Private int I =
    0;
17. Private int time =
    1000;
19. @ Override
20. Public void oncreate (bundle savedinstancestate ){
    
21. Super. oncreate (savedinstancestate );
    
22. Setcontentview (R. layout. Main );
23. TVshow = (textview) findviewbyid (R. Id. TV _show );
24. Handler. postdelayed (runnable, time); // execute every 1 s
    
25. }
27. Handler handler = new handler ();
    
28. Runnable = new runnable (){
    
30. @ Override
31. Public void run (){
    
32. // Implement the timer using the handler built-in method
33. Try {
34. Handler. postdelayed (this, time );
    
35. TVshow. settext (integer. tostring (I ++ ));
36. System. Out. println ("do ...");
37. } Catch (exception e ){
    
38. // Todo auto-generated Catch Block
    
39. E. printstacktrace ();
40. System. Out. println ("exception ...");
    
41. }
42. }
43. };
45. }

Package COM. xunfang. handerdemo; import android. app. activity; import android. OS. bundle; import android. OS. handler; import android. widget. textview;/*** handler timer use postdelyed to implement ** @ author smalt **/public class handerdemoactivity extends activity {textview TVshow; private int I = 0; private int time = 1000; @ overridepublic void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. main); TVshow = (textview) findviewbyid (R. id. TV _show); handler. postdelayed (runnable, time); // execute every 1 s} handler = new handler (); runnable = new runnable () {@ overridepublic void run () {// Handler comes with the method to implement the timer try {handler. postdelayed (this, time); TVshow. settext (integer. tostring (I ++); system. out. println ("Do... ");} catch (exception e) {// todo auto-generated catch blocke. printstacktrace (); system. out. println ("exception... ");}}};}

Method 3:

Handler + timer + timertask

[Java]
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1. Package com. xunfang. handerdemo;
   
3. Import java. util. timer;
   
4. Import java. util. timertask;
6. Import Android. App. activity;
7. Import Android. OS. Bundle;
   
8. Import Android. OS. Handler;
9. Import Android. OS. message;
   
10. Import Android. widget. textview;
    
12. /**
13. * Timer implementation: Handler + timer + timertask
    
14. *
15. * @ Author smalt
16. *
17. */
18. Public class handerdemoactivity
    Extends activity {
19. Textview TVshow;
20. Private int I =
    0;
21. Private int time =
    1000;
23. @ Override
24. Public void oncreate (bundle savedinstancestate ){
    
25. Super. oncreate (savedinstancestate );
    
26. Setcontentview (R. layout. Main );
27. TVshow = (textview) findviewbyid (R. Id. TV _show );
28. Timer. Schedule (task, 1000,
    1000); // execute the task after 1 s, and then execute the task again after 1 s
    
29. }
31. Handler handler = new handler (){
    
32. Public void handlemessage (Message MSG ){
    
33. If (msg. What =
    1 ){
34. TVshow. settext (integer. tostring (I ++ ));
35. }
36. Super. handlemessage (MSG );
37. };
38. };
39. Timer timer = new timer ();
    
40. Timertask task = new timertask (){
    
42. @ Override
43. Public void run (){
    
44. // What needs to be done: Send messages
45. Message message = new message ();
    
46. Message. What = 1;
47. Handler. sendmessage (Message );
48. }
49. };
50. }

Package COM. xunfang. handerdemo; import Java. util. timer; import Java. util. timertask; import android. app. activity; import android. OS. bundle; import android. OS. handler; import android. OS. message; import android. widget. textview;/*** timer implementation: Handler + timer + timertask ** @ author smalt **/public class handerdemoactivity extends activity {textview TVshow; private int I = 0; private int time = 1000; @ overridepublic void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. main); TVshow = (textview) findviewbyid (R. id. TV _show); timer. schedule (task, 1000,100 0); // after 1 s, execute the task again after 1 s} handler = new handler () {public void handlemessage (Message MSG) {If (MSG. what = 1) {TVshow. settext (integer. tostring (I ++);} super. handlemessage (MSG) ;};}; timer = new timer (); timertask task = new timertask () {@ overridepublic void run () {// what needs to be done: send message = new message (); message. what = 1; handler. sendmessage (Message );}};}