为下载管理器的广播接收器设置附加功能

Question

有一种方法可以把额外的DownloadManager的意图注册为行动DownloadManager.ACTION_DOWNLOAD_COMPLETE(例如接收一个布尔值设置为额外的意图)?

我是这样创建请求的:

DownloadManager.Request req = new DownloadManager.Request(myuri);
// set request parameters
//req.set...
DownloadManager downloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
downloadManager.enqueue(req);
context.registerReceiver(onComplete, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));

在我的onComplete接收器中:

private BroadcastReceiver onComplete = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {
        queryRequestParameters(context, intent);
    }
};
private void queryRequestParameters(Context context, Intent intent) {
    // get request bundle
    Bundle extras = intent.getExtras();
    DownloadManager.Query q = new DownloadManager.Query();
    q.setFilterById(extras.getLong(DownloadManager.EXTRA_DOWNLOAD_ID));
    Cursor c = ((DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE)).query(q);
    //get request parameters
    if (c.moveToFirst()) {
        int status = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS));
        if (status == DownloadManager.STATUS_SUCCESSFUL) {
            // find path in column local filename
            String path = c.getString(c.getColumnIndex(DownloadManager.COLUMN_LOCAL_FILENAME));
        }
    }
}

使用intent.getExtras()，我只能获取请求参数。我试图用不同的动作向同一接收器发送广播(一个与ACTION_DOWNLOAD_COMPLETED，另一个是自定义)，但我必须发送双重广播，因此它将在onReceive中输入两次。

Answer 1

有一种方法可以在DownloadManager的intent注册为actionDownloadManager。ACTION_DOWNLOAD_COMPLETE(例如接收一个布尔值设置为额外的意图)?

。使用你从enqueue()得到的ID来存储你想要的boolean在某个持久的地方(例如，在一个文件中)，所以当你收到你的广播时，你可以读回那个值。

另外，对于您的代码片段，请记住，在下载完成时，您的进程可能还没有完成。因此，通过registerReceiver()注册的BroadcastReceiver可能永远不会被触发。

Answer 2

答案是对的，你不能在DownloadManager的意图中添加额外的东西。但你可以将description设置为DownloadManager的请求，然后在下载完成时读取这个。我想这对你来说已经足够了。

    DownloadManager dm = (DownloadManager) getSystemService(BaseActivity.DOWNLOAD_SERVICE);
    DownloadManager.Request request = new DownloadManager.Request(
            Uri.parse((Constants.ROOT_URL_1 + fileName))); 
    request.setAllowedNetworkTypes(
            DownloadManager.Request.NETWORK_WIFI
                    | DownloadManager.Request.NETWORK_MOBILE)
            .setAllowedOverRoaming(false).setTitle(title)
            .setDescription("This is what you need!!!")
            .setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
            .setDestinationInExternalPublicDir("/my_folder", title)
            .allowScanningByMediaScanner();

您可以看到上面的描述字段。现在我将在BroadcastReceiver的onReceive方法中下载完成后阅读此内容。

            DownloadManager.Query query = new DownloadManager.Query();
            query.setFilterById(downloadId);
            Cursor c = ((DownloadManager) getSystemService(BaseActivity.DOWNLOAD_SERVICE)).query(query);
            if (c.moveToFirst()) {
                int columnIndex = c.getColumnIndex(DownloadManager.COLUMN_STATUS);
                if (DownloadManager.STATUS_SUCCESSFUL == c.getInt(columnIndex)) {
                    String uriString = c.getString(c.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI));
                    String description = c.getString(c.getColumnIndex(DownloadManager.COLUMN_DESCRIPTION));
                }
             }