小编use*_*316的帖子

我读了一些文章,似乎都做了同样的事情,我想知道启动服务之间的区别是什么:

Intent intent = new Intent(this, HelloService.class);
startService(intent);

或者像那样:

Calendar cal = Calendar.getInstance();
Intent intent = new Intent(this, MyService.class);
PendingIntent pintent = PendingIntent.getService(this, 0, intent, 0);
AlarmManager alarm = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
alarm.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), 30*1000, pintent); 

当我读完时,这两个做同样的事情,如果在服务中你返回一个参数START_STICKY;

我试图在远程服务器上移动上传.在我选择一个带有以下代码的文件并单击上传文件IS上传后,但是错误返回说代码:" - 200"消息:"HTTP错误"

       var uploader = new plupload.Uploader(
       {
           runtimes : 'html4, html5, flash, silverlight',
           browse_button : 'bt_browse',
           container: document.getElementById('container'),
           url : 'http://remote.com/upload.php',
           silverlight_xap_url : 'js/Moxie.xap',
           chunks_size: '20mb',
           max_retries: 3,
           filters : {
           max_file_size : '100mb'
       },
       multi_selection : true,  
       init: {
         PostInit: function() {
              document.getElementById('filelist').innerHTML = '';
              document.getElementById('bt_uploadfiles').onclick = function() {
                    uploader.start();
                    return false;
              };
         },
         FilesAdded: function(up, files) {
            plupload.each(files, function(file) {
                  //build list
    }},
         UploadProgress: function(up, file) {
         $("#progressBar"+file.id).val(Math.round(file.percent));
            if(Math.round(file.percent)==100){
                $("#progressBar"+file.id).hide();
                $("#deleteFile" + file.id).hide();
            }
         },
         FileUploaded: …

过去几天我正在创建一个后台服务,我注意到很多人说AlarmManager是最好的方法.

    AlarmManager am=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
    Intent intent = new Intent(context, AlarmManagerBroadcastReceiver.class);
    intent.putExtra(ONE_TIME, Boolean.FALSE);
    PendingIntent pi = PendingIntent.getBroadcast(context, 0, intent, 0);
    //After after 5 seconds
    am.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 1000 * 5 ,

我想知道的是如何确保如果此代码运行两次,则服务将不会启动2次.感谢您的帮助!