带进度条的通知栏
有时候会有些业务需要后台运行并以通知的形式，比如升级，监控什么的。
这里说下我的业务，通过提示用户升级，然后点击升级开启一个service服务在
后台进行下载并以通知的形式提供用户查看，下载完成点击通知进入安装。
1.开启服务
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Intent intent = new Intent();intent.setClass(mContext, UpgradeService.class);startService(intent);
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2.建立一个服务servive类
在onStart方法中建立notification,做写准备工作.
@Override public void onStart(Intent intent, int startId) { String sdPath = FileHelper.getSDCardPath(); if (sdPath != null) { updateFile = new File(sdPath + Global.downloadDir + "petfone.apk"); // 初始化通知管理器 this.updateNotificationMgr = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); this.updateNotification = new Notification(); updateNotification.icon=R.drawable.ic_launcher; updateIntent = new Intent(this, UpdateAppDemoActivity.class); updatePendingIntent = PendingIntent.getActivity(this, 0,updateIntent, 0); //通知自定义视图 updateNotification.contentView = new RemoteViews(getPackageName(),com.hua.test.R.layout.mynotification_progressbar); updateNotification.contentView.setProgressBar(com.hua.test.R.id.pb_notifi, 100, 0, false); updateNotification.contentIntent = updatePendingIntent;//这个pengdingIntent很重要，必须要设置 // 发出通知 //updateNotificationMgr.notify(notificationId, updateNotification); // 开启线程进行下载 new Thread(new updateThread()).start(); } super.onStart(intent, startId); } 3.开启一个线程来下载防止主线程堵塞。这里在servce写了一个内部类实现了Runnable class updateThread implements Runnable { Message msg = handler.obtainMessage(); @Override public void run() { try { if (!updateFile.exists()) { updateFile.createNewFile(); } long downSize = downloadFile(Global.NET_ADDRESS+"PetFone_G_Google.apk",updateFile); if(downSize>0){ //下载成功！ msg.what=DOWNLOAD_SUCCESS; handler.sendMessage(msg); } } catch (Exception ex) { ex.printStackTrace();//下载失败 msg.what=DOWNLOAD_FALL; handler.sendMessage(msg); } } } /** * 下载文件 * @param downloadUrl 下载路径 * @param saveFile 保存文件名 */ public long downloadFile(String downloadUrl, File saveFile) throws Exception { int downloadCount = 0; int currentSize = 0; long totalSize = 0; int updateTotalSize = 0; HttpURLConnection httpConnection = null; InputStream is = null; FileOutputStream fos = null; try{ URL url = new URL(downloadUrl); httpConnection = (HttpURLConnection)url.openConnection(); httpConnection.setRequestProperty("User-Agent", "PacificHttpClient"); if(currentSize > 0) { httpConnection.setRequestProperty("RANGE", "bytes=" + currentSize + "-"); } httpConnection.setConnectTimeout(10000); httpConnection.setReadTimeout(20000); updateTotalSize = httpConnection.getContentLength();//总大小 if(httpConnection.getResponseCode()==404){ throw new Exception("conection net 404！"); } is = httpConnection.getInputStream(); fos = new FileOutputStream(saveFile); byte[] buf = new byte[1024]; int readSize = -1; while((readSize = is.read(buf)) != -1){ fos.write(buf, 0, readSize); //通知更新进度 totalSize += readSize; int tmp = (int) (totalSize * 100 / updateTotalSize); //为了防止频繁的通知导致应用吃紧，百分比增加10才通知一次 if(downloadCount == 0 || tmp-10>downloadCount){ downloadCount+=10; Message msg = handler.obtainMessage(); msg.what=DOWNLOAD_COMPLETE; msg.arg1=downloadCount; handler.sendMessage(msg); } } }catch(Exception ex){ ex.printStackTrace(); }finally{ if(httpConnection != null) { httpConnection.disconnect(); } if(is != null) { is.close(); } if(fos != null) { fos.close(); } } return totalSize; }?
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4.需要不段的给progressBar 提供值，所以要使用handler,下载文件一定也就有3种状态，
1）.下载中，2）.下载失败，3）.下载成功。
在servive中定义好handler并定义这个3个状态码。
private final int DOWNLOAD_COMPLETE = 1, DOWNLOAD_FALL=2,DOWNLOAD_SUCCESS=3;
然后在处理这个message
private Handler handler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); switch(msg.what){ case DOWNLOAD_SUCCESS: //下载完成点击通知进入安装 Uri uri = Uri.fromFile(updateFile); Intent installIntent = new Intent(Intent.ACTION_VIEW); installIntent.setDataAndType(uri, "application/vnd.android.package-archive"); updatePendingIntent = PendingIntent.getActivity(UpgradeService.this, 0, installIntent, 0); updateNotification.defaults = Notification.DEFAULT_SOUND;//设置铃声 updateNotification.contentIntent = updatePendingIntent; //更新通知视图值 updateNotification.contentView.setTextViewText(com.hua.test.R.id.tv_downInfo, "下载成功,点击安装。"); updateNotification.contentView.setProgressBar(com.hua.test.R.id.pb_notifi, 100, 100, false); updateNotificationMgr.notify(notificationId, updateNotification); stopService(updateIntent);//停止service break; case DOWNLOAD_COMPLETE://下载中状态 System.out.println(msg.arg1); updateNotification.contentView.setProgressBar(com.hua.test.R.id.pb_notifi, 100, msg.arg1, false); updateNotification.contentView.setTextViewText(R.id.tv_downInfo, "下载中"+msg.arg1+"%"); updateNotificationMgr.notify(notificationId, updateNotification); break; case DOWNLOAD_FALL://失败状态 //updateNotification.setLatestEventInfo(UpgradeService.this, "下载失败", "", updatePendingIntent);] updateNotification.contentView.setTextViewText(com.hua.test.R.id.tv_downInfo, "下载失败"); updateNotificationMgr.notify(notificationId, updateNotification); stopService(updateIntent);//停止service break; default: stopService(updateIntent); } } };