Android基礎教程：下載管理中Notification的使用

布局文件如下：

1. <?xml version="1.0" encoding="utf-8"?>
2. <LinearLayout xmlns:Android="http://schemas.android.com/apk/res/android"
3. android:layout_width="fill_parent"
4. android:background="@drawable/page"
5. android:layout_height="wrap_content" android:orientation="vertical">
6. <Button android:id="@+id/down"
7. android:layout_width="fill_parent"
8. android:layout_height="wrap_content"
9. android:text="下載文件"/>
10. <Button android:id="@+id/newdown"
11. android:layout_width="fill_parent"
12. android:layout_height="wrap_content"
13. android:text="新建下載任務"/>
14. </LinearLayout>

1. package com.cloay.down.activity;
3. import java.util.HashMap;
5. import android.app.Activity;
6. import android.app.Notification;
7. import android.app.NotificationManager;
8. import android.app.PendingIntent;
9. import android.content.Intent;
10. import android.os.Bundle;
11. import android.view.View;
12. import android.view.View.OnClickListener;
13. import android.widget.Button;
15. import com.cloay.down.R;
16. import com.cloay.down.service.MainService;
17. import com.cloay.down.utils.Task;
18. /**
19. * 模擬下載網頁上的下載按鈕
20. * DownloadActivity.java
21. * @author cloay
22. * 2011-11-18
23. */
24. public class DownloadActivity extends Activity {
25. private Button download;
26. private Button newdownload;
27. private NotificationManager notificationManager;
28. private PendingIntent pendingIntent;
29. @Override
30. public void onCreate(Bundle savedInstanceState) {
31. super.onCreate(savedInstanceState);
32. setContentView(R.layout.main);
34. Intent intent = new Intent("com.cloay.down.service.MainService");
35. this.startService(intent);
37. notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
38. Intent intent1 = new Intent(this, DownLoadManager.class);
39. pendingIntent = PendingIntent.getActivity(this, 0, intent1, PendingIntent.FLAG_ONE_SHOT);
43. download = (Button) findViewById(R.id.down);
44. download.setOnClickListener(new OnClickListener() {
46. @Override
47. public void onClick(View v) {
49. startLoadTask("http://taoke.youkk.net/Mine.mp3");
50. }
51. });
52. newdownload = (Button) findViewById(R.id.newdown);
53. newdownload.setOnClickListener(new OnClickListener() {
55. @Override
56. public void onClick(View v) {
58. startLoadTask("http://mp3.jayie.com/38.mp3");
59. }
60. });
61. }
63. private void startLoadTask(String url) {
64. //使用service後台下載
65. HashMap<String, String> parm = new HashMap<String, String>();
66. parm.put("url", url);
67. Task task = new Task(Task.LOAD_FILE, parm);
68. MainService.newTask(task);
69. Notification notification = new Notification();
70. notification.icon = R.drawable.download_notification;
71. notification.tickerText = "下載任務已添加到下載列表中,點擊查看!";
72. notification.defaults = Notification.DEFAULT_SOUND;
73. notification.setLatestEventInfo(DownloadActivity.this, "下載任務已啟動", "下載任務已添加到下載列表中!", pendingIntent);
74. notificationManager.notify(0, notification);
75. }
76. }