Android中如何实现键盘操作

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一般是如下三个Android键盘操作的函数：

onKeyDown, onKeyUp, on, onKeyMultiple

参看如下Android键盘操作代码：

1. import android.app.Activity;

2. import android.app.ProgressDialog;

3. import android.os.Bundle;

4. import android.view.KeyEvent;

5. import android.view.Menu;

6. import android.view.MenuItem;

7. import android.widget.TextView;

8. public class TestProgress extends Activity {

9. private ProgressDialog progress = null;

10. @Override

11. public void onCreate(Bundle savedInstanceState) {

12. super.onCreate(savedInstanceState);

13. setContentView(R.layout.main);

14. }

15. @Override

16. public boolean onCreateOptionsMenu(Menu menu) {

17. super.onCreateOptionsMenu(menu);

18. menu.add(0, Menu.FIRST+1, 1, "Open Progress");

19. menu.add(0, Menu.FIRST+2, 2, "Exit");

20. return true;

21. }

22. @Override

23. public boolean onOptionsItemSelected(MenuItem item) {

24. super.onOptionsItemSelected(item);

25. switch (item.getItemId())

26. {

27. case Menu.FIRST +1:

28. {

29. progress = new ProgressDialog(this);

30. progress.setTitle("Progress!!");

31. progress.setMessage("Please wait for the operation...");

32. progress.setCancelable(true);

33. progress.show();

34. //progress = ProgressDialog.show(this, "Progress!",
    "Please wait for operation...");

35. break;

36. }

37. case Menu.FIRST +2:

38. {

39. finish();

40. break;

41. }

42. }

43. return true;

44. }

45. @Override

46. public boolean onKeyDown(int keyCode, KeyEvent event) {

47. // TODO Auto-generated method stub

48. super.onKeyDown(keyCode, event);

49. setTitle("you pressed key:" + String.valueOf(keyCode));

50. return true;

51. }

52. @Override

53. public boolean onKeyMultiple(int keyCode, int repeatCount,
    KeyEvent event) {

54. // TODO Auto-generated method stub

55. super.onKeyMultiple(keyCode, repeatCount, event);

56. TextView tv = (TextView)this.findViewById(R.id.mainview);

57. tv.setText("you have press key:[" + String.valueOf(keyCode) + "]
    for:" + String.valueOf(repeatCount) + "Times!");

58. return true;

59. }

60. @Override

61. public boolean onKeyUp(int keyCode, KeyEvent event) {

62. // TODO Auto-generated method stub

63. super.onKeyUp(keyCode, event);

64. setTitle("you release key:" + String.valueOf(keyCode));

65. return true;

66. }

67. }

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