下载管理中Notification的使用

点击下载按钮，通知用户下载任务已添加到下载列表中

布局文件如下：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:background="@drawable/page"android:layout_height="wrap_content" android:orientation="vertical"><Button android:id="@+id/down"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="下载文件"/><Button android:id="@+id/newdown"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="新建下载任务"/></LinearLayout>

主程序代码：

package com.cloay.down.activity;import java.util.HashMap;import android.app.Activity;import android.app.Notification;import android.app.NotificationManager;import android.app.PendingIntent;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import com.cloay.down.R;import com.cloay.down.service.MainService;import com.cloay.down.utils.Task;/** * 模拟下载网页上的下载按钮 * DownloadActivity.java * @author cloay * 2011-11-18 */public class DownloadActivity extends Activity {private Button download; private Button newdownload;private NotificationManager notificationManager;private PendingIntent pendingIntent;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                Intent intent = new Intent("com.cloay.down.service.MainService");    this.startService(intent);        notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);    Intent intent1 = new Intent(this, DownLoadManager.class);    pendingIntent = PendingIntent.getActivity(this, 0, intent1, PendingIntent.FLAG_ONE_SHOT);                    download = (Button) findViewById(R.id.down);        download.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {startLoadTask("http://taoke.youkk.net/Mine.mp3");}});        newdownload = (Button) findViewById(R.id.newdown);        newdownload.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {startLoadTask("http://mp3.jayie.com/38.mp3");}});    }        private void startLoadTask(String url) {//使用service后台下载HashMap<String, String> parm = new HashMap<String, String>();parm.put("url", url);Task task = new Task(Task.LOAD_FILE, parm);MainService.newTask(task);Notification notification = new Notification();notification.icon = R.drawable.download_notification;notification.tickerText = "下载任务已添加到下载列表中,点击查看!";notification.defaults = Notification.DEFAULT_SOUND;notification.setLatestEventInfo(DownloadActivity.this, "下载任务已启动", "下载任务已添加到下载列表中!", pendingIntent);notificationManager.notify(0, notification);}}

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