Android广播事件机制及应用 - Chinaunix

01.package com.Reminder;
02.import java.util.Calendar;
03.
04.import android.app.Activity;
05.import android.app.AlarmManager;
06.import android.app.PendingIntent;
07.import android.content.Intent;
08.import android.os.Bundle;
09.import android.view.View;
10.import android.widget.Button;
11.
12./**
13.* trigger the Broadcast event and set the alarm
14.*/
15.public class ReminderSetting extends Activity {
16.
17. Button btnEnable;
18.
19. /** Called when the activity is first created. */
20. @Override
21. public void onCreate(Bundle savedInstanceState) {
22. super.onCreate(savedInstanceState);
23. setContentView(R.layout.main);
24.
25. /* create a button. When you click the button, the alarm clock is enabled */
26. btnEnable=(Button)findViewById(R.id.btnEnable);
27. btnEnable.setOnClickListener(new View.OnClickListener() {
28. @Override
29. public void onClick(View v) {
30. setReminder(true);
31. }
32. });
33. }
34.
35. /**
36. * Set the alarm
37. *
38. * @param b whether enable the Alarm clock or not
39. */
40. private void setReminder(boolean b) {
41.
42. // get the AlarmManager instance
43. AlarmManager am= (AlarmManager) getSystemService(ALARM_SERVICE);
44. // create a PendingIntent that will perform a broadcast
45. PendingIntent pi= PendingIntent.getBroadcast(ReminderSetting.this, 0, new Intent(this,MyReceiver.class), 0);
46.
47. if(b){
48. // just use current time as the Alarm time.
49. Calendar c=Calendar.getInstance();
50. // schedule an alarm
51. am.set(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), pi);
52. }
53. else{
54. // cancel current alarm
55. am.cancel(pi);
56. }
57.
58. }
59.}

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01.package com.Reminder;
02.import android.content.BroadcastReceiver;
03.import android.content.Context;
04.import android.content.Intent;
05.
06./**
07.* Receive the broadcast and start the activity that will show the alarm
08.*/
09.public class MyReceiver extends BroadcastReceiver {
10.
11. /**
12. * called when the BroadcastReceiver is receiving an Intent broadcast.
13. */
14. @Override
15. public void onReceive(Context context, Intent intent) {
16.
17. /* start another activity - MyAlarm to display the alarm */
18. intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
19. intent.setClass(context, MyAlarm.class);
20. context.startActivity(intent);
21.
22. }
23.
24.}

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01.<receiver android:name=".MyReceiver">
02. <intent-filter>
03. <action android:name= "com.Reminder.MyReceiver" />
04. </intent-filter>
05.</receiver>

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01.package com.Reminder;
02.import android.app.Activity;
03.import android.app.Notification;
04.import android.app.NotificationManager;
05.import android.net.Uri;
06.import android.os.Bundle;
07.import android.provider.MediaStore.Audio;
08.import android.view.View;
09.import android.widget.Button;
10.import android.widget.TextView;
11.
12./**
13.* Display the alarm information
14.*/
15.public class MyAlarm extends Activity {
16.
17. /**
18. * An identifier for this notification unique within your application
19. */
20. public static final int NOTIFICATION_ID=1;
21.
22. @Override
23. protected void onCreate(Bundle savedInstanceState) {
24. super.onCreate(savedInstanceState);
25. setContentView(R.layout.my_alarm);
26.
27. // create the instance of NotificationManager
28. final NotificationManager nm=(NotificationManager) getSystemService(NOTIFICATION_SERVICE);
29. // create the instance of Notification
30. Notification n=new Notification();
31. /* set the sound of the alarm. There are two way of setting the sound */
32. // n.sound=Uri.parse("file:///sdcard/alarm.mp3");
33. n.sound=Uri.withAppendedPath(Audio.Media.INTERNAL_CONTENT_URI, "20");
34. // Post a notification to be shown in the status bar
35. nm.notify(NOTIFICATION_ID, n);
36.
37. /* display some information */
38. TextView tv=(TextView)findViewById(R.id.tvNotification);
39. tv.setText("Hello, it's time to bla bla...");
40.
41. /* the button by which you can cancel the alarm */
42. Button btnCancel=(Button)findViewById(R.id.btnCancel);
43. btnCancel.setOnClickListener(new View.OnClickListener() {
44.
45. @Override
46. public void onClick(View arg0) {
47. nm.cancel(NOTIFICATION_ID);
48. finish();
49. }
50. });
51. }
52.
53.}

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