解决方案：需要 API 11，请参阅下面的答案！
简单问题：使用实施的 DownloadManager 下载文件后，通知消失。下载后如何强制保留通知？
我尝试使用 VISIBILITY_VISIBLE_NOTIFY_COMPLETED，但我不知道如何使用它
感谢您为解决此问题提供的任何帮助；）
编辑：代码
public class BgDL extends Activity {
private DownloadManager mgr = null;
private long id;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.main);
mgr = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
Request request = new Request(Uri.parse(getIntent().getStringExtra("URL")));
id = mgr.enqueue(request
.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "UPDATE")
.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI|DownloadManager.Request.NETWORK_MOBILE)
.setAllowedOverRoaming(false)
.setTitle("APP update")
.setDescription("New version "+getIntent().getDoubleExtra("OV", 0.0))
);
registerReceiver(receiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
}
BroadcastReceiver receiver = new BroadcastReceiver () {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(mgr.ACTION_DOWNLOAD_COMPLETE) ){
unregisterReceiver(receiver);
finishActivity(99);
}
}
};
}