我希望能够在通知栏中显示多个文件下载,也可以取消。
我已经实现了一个自定义服务,它使用AsyncTasks并行执行多个下载。 OnPublishProgress我正在尝试更新通知栏中的各个行以显示每个文件的下载进度。在两天的时间里,我一直试图解决行闪烁,交换顺序的问题,有时只是空白或只更新一行。此外,点击行取消例程并不总是有效。
这是我的代码:
protected void showProgressNotification(final File item, int progress, boolean isDownloading) {
String message = null;
int smallIcon = 0;
Bitmap largeIcon = null;
int flags = 0;
flags |= Notification.FLAG_ONGOING_EVENT;
//flags |= Notification.FLAG_FOREGROUND_SERVICE;
//flags |= Notification.FLAG_ONLY_ALERT_ONCE;
//flags |= Notification.FLAG_AUTO_CANCEL;
NotificationCompat.Builder builder =
new NotificationCompat.Builder(getApplicationContext());
builder.setAutoCancel(true);
if (progress == 100) {
largeIcon = BitmapFactory.decodeResource(getResources(),
O2FolderListAdapter.getIconForItem(item, false));
smallIcon = R.drawable.ic_cloud_upto_date;
if (isDownloading) {
message = "Download completed. Tap to clear.";
} else {
message = "Upload completed. Tap to clear.";
}
} else if (progress >= 0) {
largeIcon = BitmapFactory.decodeResource(getResources(),
O2FolderListAdapter.getIconForItem(item, true));
if (isDownloading) {
smallIcon = R.drawable.ic_cloud_downloading;
message = "Downloading: " + progress + "%. Tap to cancel.";
} else {
smallIcon = R.drawable.ic_cloud_uploading;
message = "Uploading: " + progress + "%. Tap to cancel.";
}
builder.setProgress(100, progress, false);
} else {
largeIcon = BitmapFactory.decodeResource(getResources(),
O2FolderListAdapter.getIconForItem(item, true));
smallIcon = R.drawable.ic_cloud_conflict;
if (isDownloading)
message = "Cancelled download. Tap to clear.";
else
message = "Cancelled upload. Tap to clear.";
}
if (mResultIntent == null) {
mResultIntent = new Intent(getApplicationContext(), CustomDownloadService.class);
mResultIntent.addFlags(Notification.FLAG_ONGOING_EVENT);
}
mResultIntent.putExtra("cancel", item.getPath().hashCode());
Log.d("O2AbstractDownloadService", "Setup task id " + item.GetPath().hashCode());
if (mContentIntent == null)
mContentIntent = PendingIntent.getService(getApplicationContext(), PI_REQ_CODE, mResultIntent, PendingIntent.FLAG_UPDATE_CURRENT);
builder.setContentIntent(mContentIntent);
builder.setLargeIcon(largeIcon);
builder.setSmallIcon(smallIcon);
builder.setContentTitle(item.GetName());
builder.setContentText(message);
//if (progress != 100)
//builder.addAction(R.drawable.ic_action_dark_cancel, "Cancel", contentIntent);
final Notification notification = builder.build();
notification.flags = flags;
notification.defaults = Notification.DEFAULT_LIGHTS;
NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
// Id allows you to update the notification later on.
//mNotificationManager.notify(item.getPath().hashCode(), notification);
//startForeground(item.getPath().hashCode(), notification);
// only update notification every 100ms (unless cancel or complete)
long notificationDelay = 100;
long now = System.currentTimeMillis();
if (mFutureCallTime == 0 || now > mFutureCallTime || progress == -1 || progress == 100) {
startForeground(item.getPath().hashCode(), notification);
//mNotificationManager.notify(item.GetPath().hashCode(), notification);
} else
Log.d("CustomDownloadService", "Called too often to notification");
mFutureCallTime = now + notificationDelay;
}
因此,我正在尝试设置操作,以便在点击通知时调用服务,传递文件的ID以取消下载。谁能看到我做错了什么?我真正想要的是什么?在Xoom平板电脑上,通知会闪烁很多,但在Nexus 7上经常没有。所有设备最终都会不断地交换行,这意味着几乎不可能取消你想要的下载。
非常感谢任何建议。
更新1:我认为这可能会导致我的一个问题: Android Service.startForeground does NOT respect notification id uniqueness
更新2:通过调用builder.setWhen(fixedTime)修复了交换问题。显然,新的dateTime导致每次刷新行时重新排序。只需要修复Xoom上的闪烁和“点击取消”功能。
更新3:修复了Xoom上的闪烁,限制了刷新的调用。最后的代码可以防止通知在100ms内多次更新。剩下的问题与取消有关。要取消的点按第一次工作,但不适用于后续文件。我也无法清除行。
更新4:单个取消问题是由resultIntent字段在类级别引起的。当我每次刷新通知时创建一个新的时候,ID就会被绑定。我还将标志更改为Notification.FLAG_ONLY_ALERT_ONCE,仅使用.notify()而不是startForeground()。
答案 0 :(得分:2)
所有问题都已修复。我在原帖中添加了更新。 综上所述: 1)小心builder.setWhen(fixedTime)。 2)每100ms不要刷新一次以上 3)设置正确的标志。