为 DownloadManager 的 BroadcastReceiver 设置附加功能

Question

有一种方法可以在 DownloadManager 的意图中添加附加值以执行操作DownloadManager.ACTION_DOWNLOAD_COMPLETE（例如，接收一个在意图中设置为附加值的布尔值）？

这是我创建请求的方式：

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将广播发送到同一个接收器（一个带有 ACTION_DOWNLOAD_COMPLETED，另一个是自定义的），但我必须发送一个双广播，所以它会在 onReceive 中输入两次。

Answer 1

There's a way to put extras in DownloadManager's intent registered for actionDownloadManager.ACTION_DOWNLOAD_COMPLETE (e.g. receive a boolean value set as extra in the intent)?

没有。使用您返回的 ID from enqueue() 将您想要的 boolean 永久存储在某处（例如，在文件中），这样您就可以在收到广播时读回该值。

此外，关于您的代码片段，请记住您的进程可能在下载完成时不存在。因此，您通过 registerReceiver() 注册的 BroadcastReceiver 可能永远不会被触发。

Answer 2

答案是正确的，您不能为 DownloadManager 的意图添加额外的内容。但是您可以为 DownloadManager 的请求设置描述，然后在下载完成时阅读它。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));
                }
             }

为 DownloadManager 的 BroadcastReceiver 设置附加功能

Set extras for DownloadManager's BroadcastReceiver

android

download-manager

broadcastreceiver

android-intent