Android 计时与倒计时

原创

wx63046db09e68a 2022-08-23 20:38:36 博主文章分类：移动开发-Android ©著作权

文章标签 ide java ui线程 文章分类 OpenStack 云计算

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方法一

Timer与TimerTask（Java实现）

1. public class timerTask extends Activity{
2. 
3. private int recLen = 11;
4. private TextView txtView;
5. new Timer();
6. 
7. public void onCreate(Bundle savedInstanceState){
8. super.onCreate(savedInstanceState);
9. 
10. setContentView(R.layout.timertask);
11. txtView = (TextView)findViewById(R.id.txttime);
12. 
13. 1000, 1000);       // timeTask
14. }
15. 
16. new TimerTask() {
17. @Override
18. public void run() {
19. 
20. new Runnable() {      // UI thread
21. @Override
22. public void run() {
23. recLen--;
24. ""+recLen);
25. if(recLen < 0){
26. timer.cancel();
27. txtView.setVisibility(View.GONE);
28. }
29. }
30. });
31. }
32. };
33. }

方法二

TimerTask与Handler（不用Timer的改进型）

[java] view plain copy print ?

1. public class timerTask extends Activity{
2. private int recLen = 11;
3. private TextView txtView;
4. new Timer();
5. 
6. public void onCreate(Bundle savedInstanceState){
7. super.onCreate(savedInstanceState);
8. 
9. setContentView(R.layout.timertask);
10. txtView = (TextView)findViewById(R.id.txttime);
11. 
12. 1000, 1000);       // timeTask
13. }
14. 
15. final Handler handler = new Handler(){
16. @Override
17. public void handleMessage(Message msg){
18. switch (msg.what) {
19. case 1:
20. ""+recLen);
21. if(recLen < 0){
22. timer.cancel();
23. txtView.setVisibility(View.GONE);
24. }
25. }
26. }
27. };
28. 
29. new TimerTask() {
30. @Override
31. public void run() {
32. recLen--;
33. new Message();
34. 1;
35. handler.sendMessage(message);
36. }
37. };
38. }

方法三

Handler与Message（不用TimerTask）

[java] view plain copy print ?

1. public class timerTask extends Activity{
2. private int recLen = 11;
3. private TextView txtView;
4. 
5. public void onCreate(Bundle savedInstanceState) {
6. super.onCreate(savedInstanceState);
7. 
8. setContentView(R.layout.timertask);
9. txtView = (TextView)findViewById(R.id.txttime);
10. 
11. 1);     // Message
12. 1000);
13. }
14. 
15. final Handler handler = new Handler(){
16. 
17. public void handleMessage(Message msg){         // handle message
18. switch (msg.what) {
19. case 1:
20. recLen--;
21. "" + recLen);
22. 
23. if(recLen > 0){
24. 1);
25. 1000);      // send message
26. else{
27. txtView.setVisibility(View.GONE);
28. }
29. }
30. 
31. super.handleMessage(msg);
32. }
33. };
34. }

方法四

Handler与Thread（不占用UI线程）

[java] view plain copy print ?

1. public class timerTask extends Activity{
2. private int recLen = 0;
3. private TextView txtView;
4. 
5. public void onCreate(Bundle savedInstanceState){
6. super.onCreate(savedInstanceState);
7. 
8. setContentView(R.layout.timertask);
9. txtView = (TextView)findViewById(R.id.txttime);
10. 
11. new Thread(new MyThread()).start();         // start thread
12. }
13. 
14. final Handler handler = new Handler(){          // handle
15. public void handleMessage(Message msg){
16. switch (msg.what) {
17. case 1:
18. recLen++;
19. "" + recLen);
20. }
21. super.handleMessage(msg);
22. }
23. };
24. 
25. public class MyThread implements Runnable{      // thread
26. @Override
27. public void run(){
28. while(true){
29. try{
30. 1000);     // sleep 1000ms
31. new Message();
32. 1;
33. handler.sendMessage(message);
34. catch (Exception e) {
35. }
36. }
37. }
38. }
39. }

方法五

Handler与Runnable（最简单型）

[java] view plain copy print ?

1. public class timerTask extends Activity{
2. private int recLen = 0;
3. private TextView txtView;
4. 
5. public void onCreate(Bundle savedInstanceState){
6. super.onCreate(savedInstanceState);
7. 
8. setContentView(R.layout.timertask);
9. txtView = (TextView)findViewById(R.id.txttime);
10. 
11. 1000);
12. }
13. 
14. new Handler();
15. new Runnable() {
16. @Override
17. public void run() {
18. recLen++;
19. "" + recLen);
20. this, 1000);
21. }
22. };
23. }