android实现通知栏下载更新app示例

if(Global.localVersion //发现新版本，提示用户更新
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle("软件升级")
.setMessage("发现新版本,建议立即更新使用.")
.setPositiveButton("更新", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//开启更新服务UpdateService
//这里为了把update更好模块化，可以传一些updateService依赖的值
//如布局ID，资源ID，动态获取的标题,这里以app_name为例
Intent updateIntent =new Intent(SubwayActivity.this, UpdateService.class);
updateIntent.putExtra("titleId",R.string.app_name);
startService(updateIntent);
}
})
.setNegativeButton("取消",new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
alert.create().show();
}else{
//清理工作，略去
//cheanUpdateFile(),文章后面我会附上代码
}
}

//文件存储
private File updateDir = null;　　
private File updateFile = null;

//通知栏
private NotificationManager updateNotificatiOnManager= null;
private Notification updateNotification = null;
//通知栏跳转Intent
private Intent updateIntent = null;
private PendingIntent updatePendingIntent = null;

this.updateNotificatiOnManager= (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
this.updateNotification = new Notification();

//设置下载过程中，点击通知栏，回到主界面
updateIntent = new Intent(this, SubwayActivity.class);
updatePendingIntent = PendingIntent.getActivity(this,0,updateIntent,0);
//设置通知栏显示内容
updateNotification.icon = R.drawable.arrow_down_float;
updateNotification.tickerText = "开始下载";
updateNotification.setLatestEventInfo(this,"上海地铁","0%",updatePendingIntent);
//发出通知
updateNotificationManager.notify(0,updateNotification);

//开启一个新的线程下载，如果使用Service同步下载，会导致ANR问题，Service本身也会阻塞
new Thread(new updateRunnable()).start();//这个是下载的重点，是下载的过程

return super.onStartCommand(intent, flags, startId);
}

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();
if (httpConnection.getResponseCode() == 404) {
throw new Exception("fail!");
}
is = httpConnection.getInputStream();
fos = new FileOutputStream(saveFile, false);
byte buffer[] = new byte[4096];
int readsize = 0;
while((readsize = is.read(buffer)) > 0){
fos.write(buffer, 0, readsize);
totalSize += readsize;
//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)||(int) (totalSize*100/updateTotalSize)-10>downloadCount){
downloadCount += 10;
updateNotification.setLatestEventInfo(UpdateService.this, "正在下载", (int)totalSize*100/updateTotalSize+"%", updatePendingIntent);
updateNotificationManager.notify(0, updateNotification);
}
}
} finally {
if(httpConnection != null) {
httpConnection.disconnect();
}
if(is != null) {
is.close();
}
if(fos != null) {
fos.close();
}
}
return totalSize;
}

updateNotification.defaults = Notification.DEFAULT_SOUND;//铃声提醒
updateNotification.setLatestEventInfo(UpdateService.this, "上海地铁", "下载完成,点击安装。", updatePendingIntent);
updateNotificationManager.notify(0, updateNotification);

//停止服务
stopService(updateIntent);
case DOWNLOAD_FAIL:
//下载失败
updateNotification.setLatestEventInfo(UpdateService.this, "上海地铁", "下载完成,点击安装。", updatePendingIntent);
updateNotificationManager.notify(0, updateNotification);
default:
stopService(updateIntent);
}
}
};