我已经在我的应用上实施了推送通知,但它们运行正常。 我遇到的问题是,当我在下拉菜单中单击它们时,它们会立即重新加载应用程序。为了解决这个问题,我让app创建了一个新的活动实例。现在这会打开一个新页面,但是当从这个新页面单击回来时,它会遇到同样的问题并再次重新加载整个应用程序。
我正在使用Xamarin Forms和PCL,所以它不是纯粹的Android。 有没有办法让菜单项上的click事件加载PCL中的特定页面视图?重新加载整个应用程序是没用的。
这是创建电话通知的类:
ForegroundMessages.cs:
create table #t1 (c1 int not null,c2 int null)
select CONVERT(xml,(select *
from #t1
where 0=1
for xml raw,elements xsinil,XMLSCHEMA('XXX')
))
和第二个Activity类:
[Service]
[IntentFilter(new[] { "com.google.firebase.MESSAGING_EVENT" })]
public class ForegroundMessages: FirebaseMessagingService
{
const string TAG = "MyFirebaseMsgService";
public override void OnMessageReceived(RemoteMessage message)
{
//Log.Debug(TAG, "From: " + message.From);
//Log.Debug(TAG, "Notification Message Body: " + message.GetNotification().Body);
base.OnMessageReceived(message);
SendNotification(message.GetNotification().Body);
}
private void SendNotification(string body)
{
var intent = new Intent(this, typeof(MainActivity));
intent.AddFlags(ActivityFlags.ClearTop);
// var pendingIntent = PendingIntent.GetActivity(this, 0, intent, PendingIntentFlags.OneShot);
Log.Debug(TAG, "Notification Message Body: " + body);
// sends notification to view model
MessagingCenter.Send((App)Xamarin.Forms.Application.Current, "Increase");
Intent resultintent = new Intent(this,typeof(SecondActivity));
TaskStackBuilder stackbuilder = TaskStackBuilder.Create(this);
stackbuilder.AddParentStack(Java.Lang.Class.FromType(typeof(SecondActivity)));
stackbuilder.AddNextIntent(resultintent);
PendingIntent resultPendingIntent = stackbuilder.GetPendingIntent(0, (int)PendingIntentFlags.UpdateCurrent);
var defaultSoundUri = RingtoneManager.GetDefaultUri(RingtoneType.Notification);
var notificationBuilder = new NotificationCompat.Builder(this)
.SetSmallIcon(Resource.Drawable.icon)
.SetContentTitle("Notification")
.SetContentText(body)
.SetAutoCancel(true)
.SetSound(defaultSoundUri)
.SetContentIntent(resultPendingIntent);
var notificationManager = NotificationManager.FromContext(this);
notificationManager.Notify(0, notificationBuilder.Build());
}
}
如上所述,这可以正常工作并接收消息,当您单击它们时,它会加载第二个活动,但当离开第二个活动页面时,它只会重新加载整个应用程序。 如果我可以在PCL中加载一个视图页面(.xaml或.xaml.cs)而不是它,那会更好。
有什么想法吗?
答案 0 :(得分:2)
您可以查看my post,其中显示了我是如何做到的,我还打开了一个表单页面。帖子有点长,但基本上有一些东西:
Activity
ClearTop
标记添加到MainActivity
Intent
TaskStackBuilder
而只是使用PendingIntent.GetActivity
来获取PendingIntent
MainActivity
LaunchMode
LaunchMode.SingleTop
设置为OnNewIntent
,覆盖MainActivity
intent.HasExtras
,从而专门解决帖子中的应用重新启动问题然后检查string
您在SendNotification
方法中设置的特殊Intent
,以区分Intent
与其他private void SendNotification(string body)
{
var intent = new Intent(this, typeof(MainActivity));
intent.AddFlags(ActivityFlags.ClearTop);
// var pendingIntent = PendingIntent.GetActivity(this, 0, intent, PendingIntentFlags.OneShot);
intent.PutExtra("SomeSpecialKey", "some special value");
Log.Debug(TAG, "Notification Message Body: " + body);
// sends notification to view model
MessagingCenter.Send((App)Xamarin.Forms.Application.Current, "Increase");
PendingIntent pendingIntent = PendingIntent.GetActivity(Application.Context, 0, intent, PendingIntentFlags.UpdateCurrent | PendingIntentFlags.OneShot);
var defaultSoundUri = RingtoneManager.GetDefaultUri(RingtoneType.Notification);
var notificationBuilder = new NotificationCompat.Builder(this)
.SetSmallIcon(Resource.Drawable.icon)
.SetContentTitle("Notification")
.SetContentText(body)
.SetAutoCancel(true)
.SetSound(defaultSoundUri)
.SetContentIntent(pendingIntent);
var notificationManager = NotificationManager.FromContext(this);
notificationManager.Notify(0, notificationBuilder.Build());
}
如果您之后仍有问题,请告诉我。
[Activity(LaunchMode = LaunchMode.SingleTop, ....)]
public class MainActivity : FormsApplicationActivity {
protected override void OnNewIntent(Intent intent) {
if(intent.HasExtra("SomeSpecialKey")) {
System.Diagnostics.Debug.WriteLine("\nIn MainActivity.OnNewIntent() - Intent Extras: " + intent.GetStringExtra("SomeSpecialKey"); + "\n");
}
base.OnNewIntent(intent);
}
然后在MainActivity中:
tar czvf /tmp/empty.tgz --from-file /dev/null
tar: Option --from-file is not supported
答案 1 :(得分:0)
只需将LaunchMode = LaunchMode.SingleTask
添加到您的MainActivity