Hello,
I'm completely in the fog about applications behavior since I updated my development environment.

I recently realized that my applications don't receive GCM/FCM data message anymore when the application is in background.

The last working one, currently published on the store was built with studio 1.5.2, sdk/build Tools 23, java 1.7.

I spent many hours to investigate on the problem since I updated to studio 2.1.2, java 1.8, sdk/build Tools to 24, FCM 9.2.1.

As I didn't find anything I tried with the firebase quickstart-android project in case I modified Something in my app and noticed that I get the same problem.

In fact, when I swipe the application out from the recent apps list, I get the following message, on 2 different devices and android version..

07-23 23:12:29.002 671-31254/? I/ActivityManager: Killing 17453:com.google.firebase.quickstart.fcm/u0a297 (adj 9): remove task
07-23 23:12:29.016 14316-14524/? D/GCM: Removing messenger 0:com.google.firebase.quickstart.fcm
07-23 23:12:29.017 671-2998/? I/WindowState: WIN DEATH: Window{2a27cf7 u0 com.google.firebase.quickstart.fcm/com.google.firebase.quickstart.fcm.MainActivity}
07-23 23:12:30.148 671-4851/? I/ActivityManager: Force stopping com.google.firebase.quickstart.fcm appid=10297 user=0: from pid 18289

As I wasn't able to find what's wrong, I made a test with a working project of mine, based on GCM 8.4.0.
I tried to build it with studio 2.1.2, sdk 24, java 1.8 and I got the same problem.

So I tried to rebuild it with sdk 23, java 1.7 so the same environment I use to build it in the past, which gave me a working application.
But it doesn't receive data message in background and in fact, I notice that the application is also force killed when I swipe it out from the recent apps list !?!

The only difference I see now between the time I generated working project and now, is the version of Android Studio.

To add a precision, I get the same problem on 2 different computers and on one of them, I uninstalled/reinstalled everything.

So, I've reinstalled Studio 1.5 bundle 141.2422023 and application is no more Force stopped by the system and is now able to receive data-message correctly when it's in background!

Below are the detailed tests I made on both Studio 2.1.2 and Studio 1.5:

project Firebase quickstart-android built on Studio 1.5:

classpath 'com.google.gms:google-services:3.0.0'

compileSdkVersion 24
buildToolsVersion "24.0.0"

defaultConfig {
applicationId "com.google.firebase.quickstart.fcm"
minSdkVersion 9
targetSdkVersion 24
versionCode 1
versionName "1.0"

testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}

compile 'com.google.firebase:firebase-messaging:9.2.1'

jdk1.8.0_92

Works on Nexus 7 2013 6.0.1, GT-9295 5.0.1
----------------------------------------------

classpath 'com.google.gms:google-services:3.0.0'

compileSdkVersion 24
buildToolsVersion "24.0.0"

defaultConfig {
applicationId "com.google.firebase.quickstart.fcm"
minSdkVersion 9
targetSdkVersion 24
versionCode 1
versionName "1.0"

testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}

compile 'com.google.firebase:firebase-messaging:9.2.1'

jdk1.7.0_79

Works on Nexus 7 2013 6.0.1, GT-9295 5.0.1
----------------------------------------------

My project based on GCM built on Studio 1.5:

classpath 'com.google.gms:google-services:2.0.0-alpha6'

compileSdkVersion 23
buildToolsVersion '23.0.2'

defaultConfig {
applicationId "com.ndguide.ndguide"
minSdkVersion 18
targetSdkVersion 22
multiDexEnabled true
}

compile 'com.google.android.gms:play-services-gcm:8.4.0'

jdk1.8.0_92

Works on Nexus 7 2013 6.0.1, GT-9295 5.0.1
----------------------------------------------

My project based on GCM built on Studio 1.5:

classpath 'com.google.gms:google-services:2.0.0-alpha6'

compileSdkVersion 23
buildToolsVersion '23.0.2'

defaultConfig {
applicationId "com.ndguide.ndguide"
minSdkVersion 18
targetSdkVersion 23
multiDexEnabled true
}

compile 'com.google.android.gms:play-services-gcm:8.4.0'

jdk1.7.0_79

Works on Nexus 7 2013 6.0.1, GT-9295 5.0.1
----------------------------------------------

My project based on FCM built on Studio 1.5:

classpath 'com.google.gms:google-services:3.0.0'

compileSdkVersion 24
buildToolsVersion '24.0.0'

defaultConfig {
applicationId "com.ndguide.ndguide"
minSdkVersion 19
targetSdkVersion 24
}

compile 'com.google.firebase:firebase-messaging:9.2.1'

jdk1.8.0_92

Works on Nexus 7 2013 6.0.1, GT-9295 5.0.1
----------------------------------------------

**********************************************************

project Firebase quickstart-android built on Studio 2.1.2:

classpath 'com.google.gms:google-services:3.0.0'

compileSdkVersion 24
buildToolsVersion "24.0.0"

defaultConfig {
applicationId "com.google.firebase.quickstart.fcm"
minSdkVersion 9
targetSdkVersion 24
versionCode 1
versionName "1.0"

testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}

compile 'com.google.firebase:firebase-messaging:9.2.1'

jdk1.8.0_92

Message received in foreground and not in background Nexus 7 2013 6.0.1, GT-9295 5.0.1
Saw the following message in logcat when swiping app out from recent apps list

07-26 10:03:13.128 608-1683/? I/ActivityManager: Force stopping com.google.firebase.quickstart.fcm appid=10083 user=0: from pid 19343
----------------------------------------------

project Firebase quickstart-android built on Studio 2.1.2:

classpath 'com.google.gms:google-services:3.0.0'

compileSdkVersion 24
buildToolsVersion "24.0.0"

defaultConfig {
applicationId "com.google.firebase.quickstart.fcm"
minSdkVersion 9
targetSdkVersion 24
versionCode 1
versionName "1.0"

testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}

compile 'com.google.firebase:firebase-messaging:9.2.1'

jdk1.7.0_79

Message received in foreground and not in background on Nexus 7 2013 6.0.1, GT-9295 5.0.1
Saw the following message in logcat when swiping app out from recent apps list

07-26 10:05:24.557 608-3115/? I/ActivityManager: Force stopping com.google.firebase.quickstart.fcm appid=10083 user=0: from pid 20332
07-26 10:05:24.564 20332-20332/? D/AndroidRuntime: Shutting down VM
07-26 10:05:24.566 194-1173/? D/NuPlayerDriver: stop(0xb6058220)
07-26 10:05:24.566 194-1173/? D/NuPlayerDriver: notifyListener_l(0xb6058220), (8, 0, 0)
07-26 10:05:24.567 1239-1253/? W/MessageQueue: Handler (android.media.MediaPlayer$EventHandler) {e6095ef} sending message to a Handler on a dead thread
java.lang.IllegalStateException: Handler (android.media.MediaPlayer$EventHandler) {e6095ef} sending message to a Handler on a dead thread
at android.os.MessageQueue.enqueueMessage(MessageQueue.java:543)
at android.os.Handler.enqueueMessage(Handler.java:631)
at android.os.Handler.sendMessageAtTime(Handler.java:600)
at android.os.Handler.sendMessageDelayed(Handler.java:570)
at android.os.Handler.sendMessage(Handler.java:507)
at android.media.MediaPlayer.postEventFromNative(MediaPlayer.java:2988)
----------------------------------------------

My project based on GCM built on Studio 2.1.2 so gradle updated to 2.1.2 compared to original project, instant run deactivated:

classpath 'com.google.gms:google-services:2.0.0-alpha6'

compileSdkVersion 23
buildToolsVersion '23.0.2'

defaultConfig {
applicationId "com.ndguide.ndguide"
minSdkVersion 18
targetSdkVersion 23
multiDexEnabled true
}

compile 'com.google.android.gms:play-services-gcm:8.4.0'

jdk1.7.0_79

Message received in foreground and not in background on Nexus 7 2013 6.0.1
Saw the following message in logcat when swiping app out from recent apps list

07-26 10:23:53.167 608-1261/? I/ActivityManager: Force stopping com.ndguide.ndguide appid=10176 user=0: from pid 22958

And when I send the message

07-26 10:24:39.663 1461-1461/? W/GCM-DMM: broadcast intent callback: result=CANCELLED forIntent { act=com.google.android.c2dm.intent.RECEIVE flg=0x10000000 pkg=com.ndguide.ndguide (has extras) }

----------------------------------------------

My project based on FCM built on Studio 2.1.2 instant run deactivated:

classpath 'com.google.gms:google-services:3.0.0'

compileSdkVersion 24
buildToolsVersion '24.0.0'

defaultConfig {
applicationId "com.ndguide.ndguide"
minSdkVersion 19
targetSdkVersion 24
}

compile 'com.google.firebase:firebase-messaging:9.2.1'

jdk1.8.0_92

Message received in foreground and not in background on Nexus 7 2013 6.0.1
Saw the following message in logcat when swiping app out from recent apps list

07-26 10:32:29.131 608-1664/? I/ActivityManager: Force stopping com.ndguide.ndguide appid=10176 user=0: from pid 24892

And when I send the message

07-26 10:33:16.234 1461-1461/? W/GCM-DMM: broadcast intent callback: result=CANCELLED forIntent { act=com.google.android.c2dm.intent.RECEIVE flg=0x10000000 pkg=com.ndguide.ndguide (has extras) }

-----------------------------------------------------------

In all cases, the sent message with Google Advanced REST Client is the following one. I only changed the Authorization and token accordingly

{
"to" : "egu9jGiMcew:APA91bFv2Rewdz.....KZZmEURvbq-aA2",
"data": {
"id": 19,
"title": "Title test",
"msg": "Text of the test",
"code": 2,
"infosUrl": "ttp://www.secondguide.tours",
"longitude": 5.5,
"latitude": 44.5,
"eventLocation": "nowhere",
"startDate": "24/07/2016",
"endDate": "25/07/2016",
},
"delay_while_idle" : false,
"priority" : "high",
"content_available" : true
}

So I'm really sorry but I spent lot of time these last 2 weeks on this problem, again all this weekend and as I said again more than 3 hours this morning.
I read many post notably on Stackoverflow where we can just conclude that GCM/FCM work for some people and not for some others.

I'm now convinced at 1.000 % that despite you can have a doubt, the problem is not between the chair and the desktop but in Android Studio 2.1.2 !!!!

I cannot believe that the problem is related latitude, longitude or the temperature or I don't know what else.
So if you test the firebase project (https://github.com/firebase/quickstart-android) by yourself, you should obviously observe the same result as me.

Kind regards,
Al

Issue 37114811

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