我有一个用Xamarin Android开发的Android应用。
工作正常，但我有一个烦人的错误：通过从Android顶部栏中点击推送消息（通过Firebase消息）启动应用程序时，该应用程序会启动，但会挂在黑屏状态。
我有以下异常信息：
03-20 10:24:02.907 W/FirebaseMessaging( 9068): Error while parsing timestamp in GCM event
03-20 10:24:02.907 W/FirebaseMessaging( 9068): java.lang.NumberFormatException: s == null
03-20 10:24:02.907 W/FirebaseMessaging( 9068): at java.lang.Integer.parseInt(Integer.java:570)
03-20 10:24:02.907 W/FirebaseMessaging( 9068): at java.lang.Integer.valueOf(Integer.java:794)
03-20 10:24:02.907 W/FirebaseMessaging( 9068): at com.google.firebase.messaging.zzd.zzb(Unknown Source:60)
03-20 10:24:02.907 W/FirebaseMessaging( 9068): at com.google.firebase.messaging.zzd.zzh(Unknown Source:84)
03-20 10:24:02.907 W/FirebaseMessaging( 9068): at com.google.firebase.messaging.FirebaseMessagingService.zzo(Unknown Source:35)
03-20 10:24:02.907 W/FirebaseMessaging( 9068): at com.google.firebase.iid.zzf.zza(Unknown Source:38)
03-20 10:24:02.907 W/FirebaseMessaging( 9068): at com.google.firebase.iid.zzh.zzcfv(Unknown Source:80)
03-20 10:24:02.907 W/FirebaseMessaging( 9068): at com.google.firebase.iid.zzh.zza(Unknown Source:29)
03-20 10:24:02.907 W/FirebaseMessaging( 9068): at com.google.firebase.iid.FirebaseInstanceIdInternalReceiver.onReceive(Unknown Source:41)
03-20 10:24:02.907 W/FirebaseMessaging( 9068): at android.app.ActivityThread.handleReceiver(ActivityThread.java:3392)
03-20 10:24:02.907 W/FirebaseMessaging( 9068): at android.app.ActivityThread.-wrap18(Unknown Source:0)
03-20 10:24:02.907 W/FirebaseMessaging( 9068): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1780)
03-20 10:24:02.907 W/FirebaseMessaging( 9068): at android.os.Handler.dispatchMessage(Handler.java:105)
03-20 10:24:02.907 W/FirebaseMessaging( 9068): at android.os.Looper.loop(Looper.java:164)
03-20 10:24:02.907 W/FirebaseMessaging( 9068): at android.app.ActivityThread.main(ActivityThread.java:6944)
03-20 10:24:02.907 W/FirebaseMessaging( 9068): at java.lang.reflect.Method.invoke(Native Method)
03-20 10:24:02.907 W/FirebaseMessaging( 9068): at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
03-20 10:24:02.907 W/FirebaseMessaging( 9068): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
03-20 10:24:02.908 W/FirebaseMessaging( 9068): Unable to log event: analytics library is missing
**03-20 10:24:02.939 E/BpSurfaceComposerClient( 9068): Failed to transact (-1)
03-20 10:24:02.940 D/SurfaceView( 9068): BG destroy() Surface(name=Background for - SurfaceView - com.xy.z/md5042a29578a9bda3ea52b7f93956e5082.MainActivity@f4c217c@1) android.opengl.GLSurfaceView{f4c217c V.E...... ........ 0,0-1080,1596}
03-20 10:24:02.940 E/BpSurfaceComposerClient( 9068): Failed to transact (-1)**
Thread finished: <Thread Pool> #6
The thread 0x6 has exited with code 0 (0x0).
Thread finished: <Thread Pool> #20
Thread started: <Thread Pool> #21
The thread 0x14 has exited with code 0 (0x0).
Thread finished: <Thread Pool> #10
The thread 0xa has exited with code 0 (0x0).
更新：FireBaseMessagingService代码：
[Service]
[IntentFilter(new[] { "com.google.firebase.MESSAGING_EVENT" })]
public class MyFirebaseMessagingService : FirebaseMessagingService
{
public override void OnMessageReceived(RemoteMessage message)
{
SendNotification(message.GetNotification().Body, message.Data);
}
void SendNotification(string messageBody, IDictionary<string, string> data)
{
var intent = new Intent(this, typeof(MainActivity));
intent.AddFlags(ActivityFlags.ClearTop);
foreach (var key in data.Keys)
{
intent.PutExtra(key, data[key]);
}
var pendingIntent = PendingIntent.GetActivity(this,
MainActivity.NOTIFICATION_ID,
intent,
PendingIntentFlags.OneShot);
var notificationBuilder = new NotificationCompat.Builder(this, MainActivity.CHANNEL_ID)
.SetSmallIcon(Resource.Drawable.Icon)
.SetContentTitle("XYZ")
.SetContentText(messageBody)
.SetAutoCancel(true)
.SetContentIntent(pendingIntent);
var notificationManager = NotificationManagerCompat.From(this);
notificationManager.Notify(MainActivity.NOTIFICATION_ID, notificationBuilder.Build());
}
}
这是从服务器发送通知的代码：
public override bool Send(string deviceToken, string message)
{
try
{
var serverKey = string.Format("key={0}", "xy");
var senderId = string.Format("id={0}", "11111111");
var data = new
{
to = deviceToken,
priority = "high",
notification = new
{
title = "XYZ",
body = message,
sound = "enabled"
}
};
var jsonData = JsonConvert.SerializeObject(data);
var byteArray = Encoding.UTF8.GetBytes(jsonData);
var req = WebRequest.Create("https://fcm.googleapis.com/fcm/send");
req.Method = "post";
req.ContentType = "application/json";
req.Headers.Add(string.Format("Authorization: {0}", serverKey));
req.Headers.Add(string.Format("Sender: {0}", senderId));
using (var dataStream = req.GetRequestStream())
{
dataStream.Write(byteArray, 0, byteArray.Length);
using (var response = req.GetResponse())
{
using (var dataStreamResponse = response.GetResponseStream())
{
using (var streamReader = new StreamReader(dataStreamResponse))
{
var responseFromServer = streamReader.ReadToEnd();
}
}
}
}
return true;
}
catch (Exception exc)
{
Logger.Error(exc.Message);
Debug.Assert(false, exc.Message);
return false;
}
}
更新2： 看来在MainActivity中添加LaunchMode = LaunchMode.SingleTask，ClearTaskOnLaunch = true属性可以解决问题，但我不完全了解，为什么...
您有什么建议吗？非常感谢！
答案 0 :(得分：1)
首先检查android操作系统开始推送：
if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
{
SetOreoNotification();
}
else
{
DispatchNotificationThatServiceIsRunning();
}
然后执行此操作（摘自我的一个在所有Android设备上均可正常运行的项目：）
void DispatchNotificationThatServiceIsRunning()
{
int id = 50;
try
{
RemoteViews contentView = new RemoteViews(PackageName, Resource.Layout.Notification);
contentView.SetTextViewText(Resource.Id.txt_crrentSong_notification, Activity_Player.txt_CurrentSong.Text);
contentView.SetTextViewText(Resource.Id.txt_crrentSong__artist_notification, Activity_Player.txt_CurrentArtist.Text);
notificationBuilder = new Notification.Builder(ApplicationContext);
Notification.Builder builder = new Notification.Builder(this)
.SetSmallIcon(Resource.Drawable.btn_icon_header)
.SetCustomContentView(contentView);
Task.Delay(_countDownFirstRound).ContinueWith(t =>
{
NotificationManager notificationManager = (NotificationManager)GetSystemService(NotificationService);
notificationManager.Notify(id, notificationBuilder.Build());
DispatchNotificationThatServiceIsRunning();//This is for repeate every 1s.
_countDownFirstRound = 50;
// Click on notification, and return to app. Only works, because _2TimerRunning is set as : "LaunchMode = LaunchMode.SingleInstance"
Intent notificationIntent = new Intent(this, typeof(Activity_Player));
notificationIntent.SetAction(Intent.ActionMain);
notificationIntent.AddCategory(Intent.CategoryLauncher);
PendingIntent contentIntent = PendingIntent.GetActivity(this, 1, notificationIntent, PendingIntentFlags.UpdateCurrent);
notificationBuilder.SetContentIntent(contentIntent);
},
TaskScheduler.FromCurrentSynchronizationContext());
}
catch
{
Toast.MakeText(this, "ERROR NOTIFY", ToastLength.Short).Show();
}
}
void SetOreoNotification()
{
RemoteViews contentView = new RemoteViews(PackageName, Resource.Layout.NotificationOreo);
contentView.SetTextViewText(Resource.Id.txt_crrentSong_notification_oreo, Activity_Player.txt_CurrentSong.Text);
contentView.SetTextViewText(Resource.Id.txt_crrentSong__artist_notification_oreo, Activity_Player.txt_CurrentArtist.Text);
const string URGENT_CHANNEL = "com.xamarin.myapp.urgent";
string chanName = "xy";
var importance = NotificationImportance.Default;
NotificationChannel chan = new NotificationChannel(URGENT_CHANNEL, chanName, importance);
chan.SetSound(null, null);
//chan.EnableVibration(true);
chan.LockscreenVisibility = NotificationVisibility.Private;
NotificationManager notificationManager =
(NotificationManager)GetSystemService(NotificationService);
notificationManager.CreateNotificationChannel(chan);
Intent notificationIntent = new Intent(this, typeof(Activity_Player));
notificationIntent.SetAction(Intent.ActionMain);
notificationIntent.AddCategory(Intent.CategoryLauncher);
PendingIntent contentIntent = PendingIntent.GetActivity(this, 1, notificationIntent, PendingIntentFlags.UpdateCurrent);
Notification.Builder builder = new Notification.Builder(this)
.SetSmallIcon(Resource.Drawable.btn_icon_header)
.SetCustomContentView(contentView)
.SetChannelId(URGENT_CHANNEL)
.SetContentIntent(contentIntent)
.SetGroupAlertBehavior(NotificationGroupAlertBehavior.Summary)
.SetGroup("My group")
.SetGroupSummary(false);
const int NOTIFY_ID = 1100;
notificationManager.Notify(NOTIFY_ID, builder.Build());
}