android - putExtra 覆盖其他 putExtra

Question

在下面的 for 循环中，最后一个 putExtra 覆盖了第一个 putExtra，即使它们采用不同的参数和不同的变量。

首先:putExtra(String,String)第二:putExtra(String, int)

注意:video[i]是一个String数组

 Intent intent = new Intent(this,DownloadService.class);
        for(int i=0;i<videos.length;i++){
             intent.putExtra("VIDEOS",videos[i]);
         intent.putExtra("FILENR",(i + 1));          
             startService(intent);

        }

在我扩展 IntentService 的 DownloadService 中，VIDEOS 的值为 null !!这是为什么？

编辑:这是我的 DownloadService 类中的部分代码:

Intent broadcastIntent = new Intent();
    notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, null, 0);

notification = new Notification(R.drawable.icon, "Skitips", System.currentTimeMillis());
contentView = new RemoteViews(getPackageName(), R.layout.progress_layout);
notification.flags = Notification.FLAG_AUTO_CANCEL;
notification.contentView = contentView;
notification.contentIntent = contentIntent;
contentView.setProgressBar(R.id.status_progress, 100, 0, false);        
contentView.setTextViewText(R.id.status_text,"Downloading...");

String full_url = "";

    full_url = URL + intent.getStringExtra("VIDEOS");

String fileName = "";

    fileName = intent.getStringExtra("VIDEOS");

String fileNr = "";

    fileNr = intent.getStringExtra("FILENR");


    int count;






   Log.e("Whattttttt","is the value of VIDEOOOOSSSS: " + full_url);
    Log.e("Whatttt","is the value of fileNrrrrrrrrrrrr:" + fileNr);
    try {
    URL url = new URL(full_url);
    URLConnection conexion = url.openConnection();
    conexion.connect();
    File file = new File(root.getPath(), fileName);

    int lenghtOfFile = conexion.getContentLength();
    Log.d("ANDRO_ASYNC", "Lenght of file: " + lenghtOfFile);

    InputStream input = new BufferedInputStream(url.openStream());
    OutputStream output = new FileOutputStream(file);

    byte data[] = new byte[1024];

    long total = 0;

contentView.setTextViewText(R.id.status_text,"下载中("+ fileNr + "/77)");

在粗体文本中有 fileNr 我需要从其他 Activity 中获取 fileNr 但在这种情况下它给了我 null ...

Answer 1

那是因为 putExtra() 将数据添加到 HashMap 中。对于 hashmap，如果您使用相同的键，则先前的值将被最新的值覆盖。