检查下载活跃 [英] Check if downloads are active

问题描述

所以我使用下载管理器下载我的应用程序的多个文件。我需要这些文件在启动某项活动之前完成下载。如何检查是否有活动的下载，这样我就可以告诉用户等待下载完成。然后，他们完成的时候，我需要一个按钮可见。我GOOGLE了这一点，甚至尝试了一些code自己（盲目），并没有什么作品。如果有人能轻推我的方向是正确的，我会感激不尽。

So I'm using Download Manager to download multiple files in my app. I need these files to finish downloading before starting a certain activity. How can I check if there are active downloads, so I can tell the user to wait until the downloads are finished. And then, when they are finished, I need to make a button visible. I've googled this, even tried some code myself(blindly) and nothing works. If somebody can nudge me in the right direction I'd be grateful.

推荐答案

使用<一个href="http://developer.android.com/reference/android/app/DownloadManager.html#query%28android.app.DownloadManager.Query%29"><$c$c>query()打听下载。当你调用<一个href="http://developer.android.com/reference/android/app/DownloadManager.html#enqueue%28android.app.DownloadManager.Request%29"><$c$c>enqueue(),返回值是用于下载的ID。您可以通过状态的查询：

Use query() to inquire about downloads. When you call enqueue(), the return value is an ID for the download. You can query by status as well:

Cursor c = downloadManager.query(new DownloadManager.Query()
        .setFilterByStatus(DownloadManager.STATUS_PAUSED
                | DownloadManager.STATUS_PENDING
                | DownloadManager.STATUS_RUNNING));

要当下载完成后得到通知，注册的BroadcastReceiver 为 ACTION_DOWNLOAD_COMPLETE ：

To be notified when a download is finished, register a BroadcastReceiver for ACTION_DOWNLOAD_COMPLETE:

BroadcastReceiver onComplete = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        // do something
    }
};

registerReceiver(onComplete, new IntentFilter(
        DownloadManager.ACTION_DOWNLOAD_COMPLETE));

请注意，您还应该监听 ACTION_NOTIFICATION_CLICKED 广播知道，当用户点击该通知正在运行的下载。

Note that you should also listen for the ACTION_NOTIFICATION_CLICKED broadcast to know when a user has clicked the notification for a running download.

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