Develop Reference

Unable to write to Firebase Database from my Android application

This is the code I use to connect and write to the database (I want to create a new child node userand assign the value alex to it.
DatabaseReference mDatabase = FirebaseDatabase.getInstance().getReference();
mDatabase.child("user").setValue("alex");
Note: I have followed the correct set-up instructions and have changed the authorisation of read and write to true. The code was working for about a month but now I can't figure out why its not writing to the database.
Below is my logcat
03-12 14:43:38.882 12158-12158/? I/art: Late-enabling -Xcheck:jni
03-12 14:43:38.900 12158-12165/? I/art: Debugger is no longer active
03-12 14:43:38.900 12158-12165/? I/art: Starting a blocking GC Instrumentation
03-12 14:43:38.923 12158-12158/? W/System: ClassLoader referenced unknown path: /data/app/anaysingh.anaytyproject-1/lib/arm
03-12 14:43:38.932 12158-12158/? I/InstantRun: Instant Run Runtime started. Android package is anaysingh.anaytyproject, real application class is null.
03-12 14:43:39.090 12158-12158/? W/System: ClassLoader referenced unknown path: /data/app/anaysingh.anaytyproject-1/lib/arm
03-12 14:43:39.127 12158-12158/? D/FirebaseApp: com.google.firebase.auth.FirebaseAuth is not linked. Skipping initialization.
03-12 14:43:39.136 12158-12158/? D/FirebaseApp: com.google.firebase.crash.FirebaseCrash is not linked. Skipping initialization.
03-12 14:43:39.247 12158-12158/? V/FA: Cancelling job. JobID: -129726599
03-12 14:43:39.253 12158-12158/? V/FA: Registered activity lifecycle callback
03-12 14:43:39.255 12158-12158/? I/FirebaseInitProvider: FirebaseApp initialization successful
03-12 14:43:39.264 12158-12174/? V/FA: Collection enabled
03-12 14:43:39.264 12158-12174/? V/FA: App package, google app id: anaysingh.anaytyproject, 1:1025179625916:android:afeaaa816280de9a
03-12 14:43:39.266 12158-12174/? I/FA: App measurement is starting up, version: 11910
03-12 14:43:39.266 12158-12174/? I/FA: To enable debug logging run: adb shell setprop log.tag.FA VERBOSE
03-12 14:43:39.266 12158-12174/? I/FA: To enable faster debug mode event logging run:
adb shell setprop debug.firebase.analytics.app anaysingh.anaytyproject
03-12 14:43:39.266 12158-12174/? D/FA: Debug-level message logging enabled
03-12 14:43:39.278 12158-12174/? V/FA: Connecting to remote service
03-12 14:43:39.293 12158-12174/? V/FA: Connection attempt already in progress
03-12 14:43:39.379 12158-12158/? W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
03-12 14:43:39.384 12158-12158/? V/FA: onActivityCreated
03-12 14:43:39.534 12158-12158/? D/Connection: https://anaytyproject.firebaseio.com/Nigga
03-12 14:43:39.551 12158-12174/? V/FA: Connection attempt already in progress
03-12 14:43:39.556 12158-12174/? I/FA: Tag Manager is not found and thus will not be used
03-12 14:43:39.557 12158-12174/? D/FA: Logging event (FE): screen_view(_vs), Bundle[{firebase_event_origin(_o)=auto, firebase_screen_class(_sc)=MainActivity, firebase_screen_id(_si)=-4541290412013862895}]
03-12 14:43:39.559 12158-12177/? I/DynamiteModule: Considering local module com.google.android.gms.firebase_database:4 and remote module com.google.android.gms.firebase_database:6
03-12 14:43:39.559 12158-12177/? I/DynamiteModule: Selected remote version of com.google.android.gms.firebase_database, version >= 6
03-12 14:43:39.566 12158-12177/? W/System: ClassLoader referenced unknown path:
03-12 14:43:39.573 12158-12174/? V/FA: Connection attempt already in progress
03-12 14:43:39.574 12158-12174/? V/FA: Activity resumed, time: 4225355
03-12 14:43:39.582 12158-12177/? W/System: ClassLoader referenced unknown path: /data/user_de/0/com.google.android.gms/app_chimera/m/0000004c/n/armeabi-v7a
03-12 14:43:39.582 12158-12177/? W/System: ClassLoader referenced unknown path: /data/user_de/0/com.google.android.gms/app_chimera/m/0000004c/n/armeabi
03-12 14:43:39.604 12158-12178/? I/Adreno: QUALCOMM build : bc479b6, I15255e4b4a
Build Date : 02/22/17
OpenGL ES Shader Compiler Version: XE031.09.00.03
Local Branch :
Remote Branch : refs/tags/AU_LINUX_ANDROID_LA.UM.5.5.R1.07.00.00.269.019
Remote Branch : NONE
Reconstruct Branch : NOTHING
03-12 14:43:39.608 12158-12178/? I/OpenGLRenderer: Initialized EGL, version 1.4
03-12 14:43:39.608 12158-12178/? D/OpenGLRenderer: Swap behavior 1
03-12 14:43:39.625 12158-12179/? D/NetworkSecurityConfig: No Network Security Config specified, using platform default
03-12 14:43:39.659 12158-12174/? D/FA: Connected to remote service
03-12 14:43:39.660 12158-12174/? V/FA: Processing queued up service tasks: 4
03-12 14:43:44.701 12158-12174/anaysingh.anaytyproject V/FA: Inactivity, disconnecting from the service
03-12 14:43:56.840 12158-12174/anaysingh.anaytyproject V/FA: Recording user engagement, ms: 17290
03-12 14:43:56.840 12158-12174/anaysingh.anaytyproject V/FA: Connecting to remote service
03-12 14:43:56.842 12158-12174/anaysingh.anaytyproject V/FA: Activity paused, time: 4242644
03-12 14:43:56.844 12158-12174/anaysingh.anaytyproject D/FA: Logging event (FE): user_engagement(_e), Bundle[{firebase_event_origin(_o)=auto, engagement_time_msec(_et)=17290, firebase_screen_class(_sc)=MainActivity, firebase_screen_id(_si)=-4541290412013862895}]
03-12 14:43:56.852 12158-12174/anaysingh.anaytyproject V/FA: Connection attempt already in progress
03-12 14:43:56.852 12158-12174/anaysingh.anaytyproject D/FA: Connected to remote service
03-12 14:43:56.852 12158-12174/anaysingh.anaytyproject V/FA: Processing queued up service tasks: 2
What am I doing wrong, my firebase database still shows null. However when I add data manually and read via JS it is working correctly.

The errors tell you that you haven't linked Firebase to your project.
03-12 14:43:39.127 12158-12158/? D/FirebaseApp: com.google.firebase.auth.FirebaseAuth is not linked. Skipping initialization.
03-12 14:43:39.136 12158-12158/? D/FirebaseApp: com.google.firebase.crash.FirebaseCrash is not linked. Skipping initialization.
Use the Firebase Assistant to set it up:
To open the Firebase Assistant in Android Studio:
Click Tools > Firebase to open the Assistant window.
Click to expand one of the listed features (for example, Analytics), then click the provided tutorial link (for example, Log an Analytics event).
Click the Connect to Firebase button to connect to Firebase and add the necessary code to your app.
Full documentation here.

Firebase SDK is out of date, no ad showing

I found here Android Studio - SDK is out of date or is missing templates I need to update in my SDK tools.
I see no option for Firebase.
I followed the AdMob instructions. A 403 "unable to show ad" error showed, then I switched my ad unit type to "Banner" and used the test banner unit id "ca-app-pub-3940256099942544/6300978111".
My onCreate in main activity:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MobileAds.initialize(this, "my addmob id ");
mAdView = findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder().build();
mAdView.loadAd(adRequest);
initialiseView();
}
My layout:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
</LinearLayout>
<com.google.android.gms.ads.AdView
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:id="#+id/adView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
ads:adSize="BANNER"
ads:adUnitId="ca-app-pub-3940256099942544/6300978111"
android:layout_below="#+id/linearLayout">
</com.google.android.gms.ads.AdView>
</RelativeLayout>
and my logs:
W/GooglePlayServicesUtil: Google Play Store is missing.
D/NetworkSecurityConfig: No Network Security Config specified, using platform default
W/GooglePlayServicesUtil: Google Play Store is missing.
W/GooglePlayServicesUtil: Google Play Store is missing.
W/GooglePlayServicesUtil: Google Play services is missing.
W/GooglePlayServicesUtil: Google Play Store is missing.
W/GooglePlayServicesUtil: Google Play Store is missing.
I/Ads: Starting ad request.
I/Ads: Use AdRequest.Builder.addTestDevice("C8DCA36186E6C4138C4E71BB102F78D2") to get test ads on this device.
W/GooglePlayServicesUtil: Google Play Store is missing.
W/GooglePlayServicesUtil: Google Play Store is missing.
W/Ads: Invoke Firebase method getInstance error.
W/Ads: The Google Mobile Ads SDK will not integrate with Firebase. Admob/Firebase integration requires the latest Firebase SDK jar, but Firebase SDK is either missing or out of date
W/GooglePlayServicesUtil: Google Play Store is missing.
W/GooglePlayServicesUtil: Google Play Store is missing.
W/System: ClassLoader referenced unknown path: /system/app/webview/lib/x86
W/art: Before Android 4.1, method double java.util.concurrent.ThreadLocalRandom.internalNextDouble(double, double) would have incorrectly overridden the package-private method in java.util.Random
W/art: Before Android 4.1, method int java.util.concurrent.ThreadLocalRandom.internalNextInt(int, int) would have incorrectly overridden the package-private method in java.util.Random
W/art: Before Android 4.1, method long java.util.concurrent.ThreadLocalRandom.internalNextLong(long, long) would have incorrectly overridden the package-private method in java.util.Random
I/WebViewFactory: Loading com.android.webview version 51.0.2704.91 (code 275509110)
I/cr_LibraryLoader: Time to load native libraries: 6 ms (timestamps 8593-8599)
I/cr_LibraryLoader: Expected native library version number "51.0.2704.91", actual native library version number "51.0.2704.91"
D/MediaPlayer: setSubtitleAnchor in MediaPlayer
D/MediaPlayer: setSubtitleAnchor in MediaPlayer
D/MediaPlayer: setSubtitleAnchor in MediaPlayer
I/art: Rejecting re-init on previously-failed class java.lang.Class<com.google.android.gms.internal.zzflm>: java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/customtabs/CustomTabsServiceConnection;
I/art: at boolean com.google.android.gms.internal.zznn.zzi(android.content.Context) ((null):-1)
I/art: at void com.google.android.gms.internal.zzabv.<init>(android.content.Context, com.google.android.gms.internal.zzabu) ((null):-1)
I/art: at java.lang.Object com.google.android.gms.internal.zzabx.call() ((null):-1)
I/art: at void com.google.android.gms.internal.zzago.run() ((null):-1)
I/art: at java.lang.Object java.util.concurrent.Executors$RunnableAdapter.call() (Executors.java:428)
I/art: at void java.util.concurrent.FutureTask.run() (FutureTask.java:237)
I/art: at void java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) (ThreadPoolExecutor.java:1133)
I/art: at void java.util.concurrent.ThreadPoolExecutor$Worker.run() (ThreadPoolExecutor.java:607)
I/art: at void java.lang.Thread.run() (Thread.java:761)
I/art: Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.customtabs.CustomTabsServiceConnection" on path: DexPathList[[zip file "/data/app/zapbear.quantumproductions.com.zappybear-2/base.apk"],nativeLibraryDirectories=[/data/app/zapbear.quantumproductions.com.zappybear-2/lib/x86, /system/lib, /vendor/lib]]
I/art: at java.lang.Class dalvik.system.BaseDexClassLoader.findClass(java.lang.String) (BaseDexClassLoader.java:56)
I/art: at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:380)
I/art: at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String) (ClassLoader.java:312)
I/art: at boolean com.google.android.gms.internal.zznn.zzi(android.content.Context) ((null):-1)
I/art: at void com.google.android.gms.internal.zzabv.<init>(android.content.Context, com.google.android.gms.internal.zzabu) ((null):-1)
I/art: at java.lang.Object com.google.android.gms.internal.zzabx.call() ((null):-1)
I/art: at void com.google.android.gms.internal.zzago.run() ((null):-1)
I/art: at java.lang.Object java.util.concurrent.Executors$RunnableAdapter.call() (Executors.java:428)
I/art: at void java.util.concurrent.FutureTask.run() (FutureTask.java:237)
I/art: at void java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker) (ThreadPoolExecutor.java:1133)
I/art: at void java.util.concurrent.ThreadPoolExecutor$Worker.run() (ThreadPoolExecutor.java:607)
I/art: at void java.lang.Thread.run() (Thread.java:761)
I/art: [ 11-20 01:41:39.886 2681: 2681 D/ ]
HostConnection::get() New Host Connection established 0xd9e15090, tid 2681
V/WebViewChromiumFactoryProvider: Binding Chromium to main looper Looper (main, tid 1) {f36c082}
I/cr_LibraryLoader: Expected native library version number "51.0.2704.91", actual native library version number "51.0.2704.91"
I/chromium: [INFO:library_loader_hooks.cc(143)] Chromium logging enabled: level = 0, default verbosity = 0
I/cr_BrowserStartup: Initializing chromium process, singleProcess=true
E/ApkAssets: Error while loading asset assets/natives_blob_64.bin: java.io.FileNotFoundException: assets/natives_blob_64.bin
E/ApkAssets: Error while loading asset assets/snapshot_blob_64.bin: java.io.FileNotFoundException: assets/snapshot_blob_64.bin
D/libEGL: Emulator has host GPU support, qemu.gles is set to 1.
E/libEGL: load_driver(/system/lib/egl/libGLES_emulation.so): dlopen failed: library "/system/lib/egl/libGLES_emulation.so" not found
D/libEGL: loaded /system/lib/egl/libEGL_emulation.so
D/libEGL: loaded /system/lib/egl/libGLESv1_CM_emulation.so
D/libEGL: loaded /system/lib/egl/libGLESv2_emulation.so
E/eglCodecCommon: glUtilsParamSize: unknow param 0x00008d57
W/cr_media: Requires BLUETOOTH permission
I/cr_DRP: No DRP key due to exception:java.lang.ClassNotFoundException: com.android.webview.chromium.Drp
D/cr_Ime: [InputMethodManagerWrapper.java:30] Constructor
W/cr_AwContents: onDetachedFromWindow called when already detached. Ignoring
D/cr_Ime: [InputMethodManagerWrapper.java:59] isActive: false
I/cr_Ime: ImeThread is not enabled.
E/libEGL: validate_display:99 error 3008 (EGL_BAD_DISPLAY)
I/OpenGLRenderer: Initialized EGL, version 1.4
D/OpenGLRenderer: Swap behavior 1
[ 11-20 01:41:40.059 2681: 2747 D/ ]
HostConnection::get() New Host Connection established 0xf2e305a0, tid 2747
I/VideoCapabilities: Unsupported profile 4 for video/mp4v-es
[ 11-20 01:41:40.076 2681: 2779 D/ ]
HostConnection::get() New Host Connection established 0xd54ee1b0, tid 2779
W/EGL_emulation: eglSurfaceAttrib not implemented
W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xd9ee1e80, error=EGL_SUCCESS
V/assigned screenW: 1080.0
V/The jump force is: 21.637500000000003
E/chromium: [ERROR:gles2_cmd_decoder.cc(2167)] [GroupMarkerNotSet(crbug.com/242999)!:54DB7FD8]GL ERROR :GL_INVALID_OPERATION : BackFramebuffer::Create: <- error from previous GL command
W/cr_BindingManager: Cannot call determinedVisibility() - never saw a connection for the pid: 2681
D/cr_Ime: [InputMethodManagerWrapper.java:59] isActive: false
I/chromium: [INFO:CONSOLE(0)] "Document was loaded from Application Cache with manifest https://googleads.g.doubleclick.net/mads/static/mad/sdk/native/sdk-core-v40.appcache", source: https://googleads.g.doubleclick.net/mads/static/mad/sdk/native/sdk-core-v40.html (0)
I/chromium: [INFO:CONSOLE(0)] "Application Cache Checking event", source: https://googleads.g.doubleclick.net/mads/static/mad/sdk/native/sdk-core-v40.html (0)
I/chromium: [INFO:CONSOLE(0)] "Application Cache NoUpdate event", source: https://googleads.g.doubleclick.net/mads/static/mad/sdk/native/sdk-core-v40.html (0)
W/GooglePlayServicesUtil: Google Play services is missing.
D/cr_Ime: [InputMethodManagerWrapper.java:30] Constructor
W/cr_AwContents: onDetachedFromWindow called when already detached. Ignoring
D/cr_Ime: [InputMethodManagerWrapper.java:59] isActive: false
W/Ads: Not enough space to show ad. Needs 320x49 dp, but only has 320x0 dp.
E/chromium: [ERROR:gles2_cmd_decoder.cc(2167)] [GroupMarkerNotSet(crbug.com/242999)!:5420DED3]GL ERROR :GL_INVALID_OPERATION : BackFramebuffer::Create: <- error from previous GL command
I/cr_Ime: ImeThread is not enabled.
W/cr_BindingManager: Cannot call determinedVisibility() - never saw a connection for the pid: 2681
D/cr_Ime: [InputMethodManagerWrapper.java:59] isActive: false
W/Ads: Not enough space to show ad. Needs 320x49 dp, but only has 320x0 dp.
I/Ads: Scheduling ad refresh 60000 milliseconds from now.
D/cr_Ime: [InputMethodManagerWrapper.java:30] Constructor
W/cr_AwContents: onDetachedFromWindow called when already detached. Ignoring
D/cr_Ime: [InputMethodManagerWrapper.java:59] isActive: false
I/cr_Ime: ImeThread is not enabled.
I/Ads: Ad finished loading.
but I see no ad, just my app as usual.

How to add Firebase into android

I want added Firebase into my application. I write below codes, but when running application I can't see TOKEN in log!
My dependencies :
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.3.0'
compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha7'
compile 'com.google.firebase:firebase-messaging:10.0.1'
testCompile 'junit:junit:4.12'
}
apply plugin: 'com.google.gms.google-services'
Manifest :
<application>
...
<!--Firebase service-->
<service android:name=".CloudMSG.MyFirebaseInctanceIdService">
<intent-filter>
<action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
</intent-filter>
</service>
</application>
MyFirebaseInctanceIdService :
public class MyFirebaseInctanceIdService extends FirebaseInstanceIdService {
private static final String TAG = "MyFirebaseInctance";
#Override
public void onTokenRefresh() {
// Get updated InstanceID token.
String refreshedToken = FirebaseInstanceId.getInstance().getToken();
Log.d("MyFirebaseInctance", "Refreshed token: " + refreshedToken);
// If you want to send messages to this application instance or
// manage this apps subscriptions on the server side, send the
// Instance ID token to your app server.
//sendRegistrationToServer(refreshedToken);
}
}
Logs:
03-30 13:36:42.943 9487-9487/? I/art: Late-enabling -Xcheck:jni
03-30 13:36:43.218 9487-9487/com.example.mohammad.a1_firebase D/FirebaseApp: com.google.firebase.auth.FirebaseAuth is not linked. Skipping initialization.
03-30 13:36:43.269 9487-9487/com.example.mohammad.a1_firebase W/InstanceID/Rpc: Found 10004
03-30 13:36:43.298 9487-9487/com.example.mohammad.a1_firebase D/FirebaseApp: com.google.firebase.crash.FirebaseCrash is not linked. Skipping initialization.
03-30 13:36:43.364 9487-9487/com.example.mohammad.a1_firebase I/FA: App measurement is starting up, version: 10084
03-30 13:36:43.364 9487-9487/com.example.mohammad.a1_firebase I/FA: To enable debug logging run: adb shell setprop log.tag.FA VERBOSE
03-30 13:36:43.364 9487-9487/com.example.mohammad.a1_firebase D/FA: Debug-level message logging enabled
03-30 13:36:43.364 9487-9487/com.example.mohammad.a1_firebase D/FA: AppMeasurement singleton hash: 720240273
03-30 13:36:43.404 9487-9487/com.example.mohammad.a1_firebase V/FA: Collection enabled
03-30 13:36:43.404 9487-9487/com.example.mohammad.a1_firebase V/FA: App package, google app id: com.example.mohammad.a1_firebase, 1:685652680518:android:0280a3bc1c6da8cb
03-30 13:36:43.405 9487-9487/com.example.mohammad.a1_firebase I/FA: To enable faster debug mode event logging run:
adb shell setprop debug.firebase.analytics.app com.example.mohammad.a1_firebase
03-30 13:36:43.463 9487-9487/com.example.mohammad.a1_firebase V/FA: Registered activity lifecycle callback
03-30 13:36:43.465 9487-9487/com.example.mohammad.a1_firebase I/FirebaseInitProvider: FirebaseApp initialization successful
03-30 13:36:43.467 9487-9487/com.example.mohammad.a1_firebase I/InstantRun: Starting Instant Run Server for com.example.mohammad.a1_firebase
03-30 13:36:43.471 9487-9587/com.example.mohammad.a1_firebase V/FA: Using measurement service
03-30 13:36:43.489 9487-9587/com.example.mohammad.a1_firebase V/FA: Connecting to remote service
03-30 13:36:43.528 9487-9587/com.example.mohammad.a1_firebase W/GooglePlayServicesUtil: Google Play services out of date. Requires 10084000 but found 6599430
03-30 13:36:43.612 9487-9487/com.example.mohammad.a1_firebase D/ContextHelper: convertTheme. context->name=com.example.mohammad.a1_firebase themeResourceId=2131230883
03-30 13:36:43.656 9487-9487/com.example.mohammad.a1_firebase W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
03-30 13:36:43.690 9487-9487/com.example.mohammad.a1_firebase V/FA: onActivityCreated
03-30 13:36:43.696 9487-9487/com.example.mohammad.a1_firebase I/PhoneWindow: [generateLayout] setColorNavigationBar => color=0x ff000001
03-30 13:36:43.718 9487-9487/com.example.mohammad.a1_firebase D/PhoneWindowEx: [PWEx][generateLayout] setNavigationBarColor2 : colors=0xfff5f5f5
03-30 13:36:43.718 9487-9487/com.example.mohammad.a1_firebase I/PhoneWindow: [setNavigationBarColor2] color=0x fff5f5f5
03-30 13:36:43.859 9487-9587/com.example.mohammad.a1_firebase V/FA: Using measurement service
03-30 13:36:43.859 9487-9587/com.example.mohammad.a1_firebase V/FA: Connection attempt already in progress
03-30 13:36:43.864 9487-9587/com.example.mohammad.a1_firebase V/FA: Activity resumed, time: 1436094125
03-30 13:36:43.879 9487-9612/com.example.mohammad.a1_firebase D/OpenGLRenderer: Render dirty regions requested: true
03-30 13:36:43.881 9487-9612/com.example.mohammad.a1_firebase I/Adreno-EGL: <qeglDrvAPI_eglInitialize:410>: EGL 1.4 QUALCOMM build: AU_LINUX_ANDROID_LA.BF.1.1.1_RB1.05.00.02.042.013_msm8974_LA.BF.1.1.1_RB1__release_AU ()
OpenGL ES Shader Compiler Version: E031.25.03.00
Build Date: 01/21/15 Wed
Local Branch: mybranch7061829
Remote Branch: quic/LA.BF.1.1.1_rb1.7
Local Patches: NONE
Reconstruct Branch: AU_LINUX_ANDROID_LA.BF.1.1.1_RB1.05.00.02.042.013 + NOTHING
03-30 13:36:43.882 9487-9612/com.example.mohammad.a1_firebase I/OpenGLRenderer: Initialized EGL, version 1.4
03-30 13:36:43.910 9487-9612/com.example.mohammad.a1_firebase D/OpenGLRenderer: Enabling debug mode 0
03-30 13:36:43.916 9487-9487/com.example.mohammad.a1_firebase D/Atlas: Validating map...
03-30 13:36:43.927 9487-9487/com.example.mohammad.a1_firebase W/FA: Service connection failed: ConnectionResult{statusCode=SERVICE_VERSION_UPDATE_REQUIRED, resolution=null, message=null}
03-30 13:36:43.936 9487-9592/com.example.mohammad.a1_firebase D/FirebaseInstanceId: background sync failed: SERVICE_NOT_AVAILABLE, retry in 30s
03-30 13:36:44.008 9487-9502/com.example.mohammad.a1_firebase W/art: Suspending all threads took: 5.068ms
03-30 13:36:44.047 9487-9487/com.example.mohammad.a1_firebase W/art: Before Android 4.1, method int android.support.v7.widget.ListViewCompat.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView
03-30 13:36:44.183 9487-9487/com.example.mohammad.a1_firebase I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy#755dbad time:128236912
03-30 13:37:14.017 9487-10051/com.example.mohammad.a1_firebase D/FirebaseInstanceId: background sync failed: SERVICE_NOT_AVAILABLE, retry in 60s
How can I fix this issue and show Firebase token in logs?

Firebase onTokenRefresh() will only be called if your token changes. Before that you should invoke
FirebaseInstanceId.getInstance().getToken()
in your initial activity (like MainActivity) maybe.

why you not tried integrated android studio with firebase directly using Tools menu-->firebase
add this line Gradle :-Module(app)
compile 'com.google.firebase:firebase-crash:10.2.0'
compile 'com.google.firebase:firebase-auth:10.2.0'

Try to uninstall the application and re-install , you will see the
Refreshed token in the logcat.
Also check in firebase console that Anonymous sign-in status is
Enabled or not in Authentication menu -> Sign in method

'Unfortunately, app has stopped' is shown twice on the device and 'Application terminated' in android studio with no error being shown

I am developing an app using Android Studio.
The problem is that app gets crashed twice within few minutes of running it and besides Application terminated. and normal logs no error is shown in the logcat.
Here's complete logcat:
02/12 22:31:34: Launching app
Cold swapped changes.
$ adb shell am start -n "com.abc.xxx/com.abc.xxx.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Connected to process 13399 on device micromax-micromax_aq4502-2864004C04884I2
I/art: Late-enabling -Xcheck:jni
W/System: ClassLoader referenced unknown path: /data/app/com.abc.xxx-2/lib/arm
I/InstantRun: Instant Run Runtime started. Android package is com.abc.xxx, real application class is null.
W/System: ClassLoader referenced unknown path: /data/app/com.abc.xxx-2/lib/arm
W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found.
W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found.
I/art: Background sticky concurrent mark sweep GC freed 11281(1218KB) AllocSpace objects, 22(696KB) LOS objects, 15% free, 5MB/6MB, paused 13.077ms total 70.659ms
I/DynamiteModule: Considering local module com.google.android.gms.flags:2 and remote module com.google.android.gms.flags:0
I/DynamiteModule: Selected local version of com.google.android.gms.flags
W/DynamiteModule: Local module descriptor class for com.google.android.gms.crash not found.
I/DynamiteModule: Considering local module com.google.android.gms.crash:0 and remote module com.google.android.gms.crash:4
I/DynamiteModule: Selected remote version of com.google.android.gms.crash, version >= 4
W/System: ClassLoader referenced unknown path: /data/user/0/com.google.android.gms/app_chimera/m/00000012/n/armeabi-v7a
W/System: ClassLoader referenced unknown path: /data/user/0/com.google.android.gms/app_chimera/m/00000012/n/armeabi
I/FirebaseCrashApiImpl: FirebaseCrashApiImpl created by ClassLoader p[DexPathList[[zip file "/data/data/com.google.android.gms/app_chimera/m/00000012/DynamiteModulesC_GmsCore_prodmnc_hdpi_release.apk"],nativeLibraryDirectories=[/data/user/0/com.google.android.gms/app_chimera/m/00000012/n/armeabi-v7a, /data/user/0/com.google.android.gms/app_chimera/m/00000012/n/armeabi, /vendor/lib, /system/lib]]]
I/DynamiteModule: Considering local module com.google.android.gms.flags:2 and remote module com.google.android.gms.flags:0
I/DynamiteModule: Selected local version of com.google.android.gms.flags
W/DynamiteModule: Local module descriptor class for com.google.android.gms.crash not found.
I/FA: App measurement is starting up, version: 10084
I/FA: To enable debug logging run: adb shell setprop log.tag.FA VERBOSE
D/FA: Debug-level message logging enabled
D/FA: AppMeasurement singleton hash: 198168520
V/FA: Collection enabled
V/FA: App package, google app id: com.abc.xxx, 1:987905869088:android:e7f50263e7b8aa58
I/FA: To enable faster debug mode event logging run:
adb shell setprop debug.firebase.analytics.app com.getsportalapp.sportal
V/FA: Registered activity lifecycle callback
I/FirebaseCrash: FirebaseCrash reporting initialized com.google.android.gms.internal.zzbks#e551d72
I/FirebaseInitProvider: FirebaseApp initialization successful
V/FA: Using measurement service
V/FA: Connecting to remote service
W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
W/com.facebook.appevents.AppEventsLogger: activateApp events are being logged automatically. There's no need to call activateApp explicitly, this is safe to remove.
I/GAC: Building GoogleApiClient
I/CrashlyticsCore: Initializing Crashlytics 2.3.15.167
V/FA: Connection attempt already in progress
V/FA: Activity resumed, time: 824779068
D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: false
D/signedIn: onAuthStateChanged:signed_in:ShXMXdc5kHUQZWG3lGudJtt2
I/DynamiteModule: Considering local module com.google.android.gms.firebase_database:4 and remote module com.google.android.gms.firebase_database:5
I/DynamiteModule: Selected remote version of com.google.android.gms.firebase_database, version >= 5
I/OpenGLRenderer: Initialized EGL, version 1.4
I/MaliEGL: [Mali]window_type=1, is_framebuffer=0, errnum = 0
I/MaliEGL: [Mali]surface->num_buffers=4, surface->num_frames=3, win_min_undequeued=1
I/MaliEGL: [Mali]max_allowed_dequeued_buffers=3
E/RecyclerView: No adapter attached; skipping layout
D/FA: Connected to remote service
V/FA: Processing queued up service tasks: 2
E/RecyclerView: No adapter attached; skipping layout
D/getInvitation: getInvitation: no deep link found.
D/called: again
D/cLat: 2.8418744
D/cLng: 8.7791019
I/MaliEGL: [Mali]window_type=1, is_framebuffer=0, errnum = 0
I/MaliEGL: [Mali]surface->num_buffers=4, surface->num_frames=3, win_min_undequeued=1
I/MaliEGL: [Mali]max_allowed_dequeued_buffers=3
W/PersistentConnection: pc_0 - Using an unspecified index. Consider adding '".indexOn": "g"' at geofire to your security and Firebase Database rules for better performance
W/PersistentConnection: pc_0 - Using an unspecified index. Consider adding '".indexOn": "g"' at geofire to your security and Firebase Database rules for better performance
W/PersistentConnection: pc_0 - Using an unspecified index. Consider adding '".indexOn": "g"' at geofire to your security and Firebase Database rules for better performance
W/PersistentConnection: pc_0 - Using an unspecified index. Consider adding '".indexOn": "g"' at geofire to your security and Firebase Database rules for better performance
W/Settings: Setting airplane_mode_on has moved from android.provider.Settings.System to android.provider.Settings.Global, returning read-only value.
W/System: ClassLoader referenced unknown path: /data/user/0/com.google.android.gms/app_chimera/m/00000010/n/armeabi
D/DynamitePackage: Instantiated singleton DynamitePackage.
D/DynamitePackage: Instantiating com.google.android.gms.ads.ChimeraAdManagerCreatorImpl
I/DynamiteModule: Considering local module com.google.android.gms.piccard.dynamite:0 and remote module com.google.android.gms.piccard.dynamite:12
I/DynamiteModule: Selected remote version of com.google.android.gms.piccard.dynamite, version >= 12
W/System: ClassLoader referenced unknown path: /data/user/0/com.google.android.gms/app_chimera/m/00000010/n/armeabi
W/VideoCapabilities: Unrecognized profile/level 32768/2 for video/mp4v-es
I/VideoCapabilities: Unsupported profile 8 for video/mp4v-es
I/VideoCapabilities: Unsupported profile 8 for video/mp4v-es
I/VideoCapabilities: Unsupported profile 8 for video/mp4v-es
I/VideoCapabilities: Unsupported profile 8 for video/mp4v-es
I/VideoCapabilities: Unsupported profile 8 for video/mp4v-es
I/VideoCapabilities: Unsupported profile 8 for video/mp4v-es
I/VideoCapabilities: Unsupported profile 4 for video/mp4v-es
I/Ads: Starting ad request.
I/WebViewFactory: Loading com.google.android.webview version 53.0.2785.124 (code 278512400)
D/diffAnother: -6283000
I/art: Rejecting re-init on previously-failed class java.lang.Class<com.android.webview.chromium.ServiceWorkerControllerAdapter>
I/art: Rejecting re-init on previously-failed class java.lang.Class<com.android.webview.chromium.ServiceWorkerControllerAdapter>
I/art: Rejecting re-init on previously-failed class java.lang.Class<com.android.webview.chromium.TokenBindingManagerAdapter>
I/art: Rejecting re-init on previously-failed class java.lang.Class<com.android.webview.chromium.TokenBindingManagerAdapter>
I/cr_LibraryLoader: Time to load native libraries: 6 ms (timestamps 5738-5744)
I/cr_LibraryLoader: Expected native library version number "53.0.2785.124", actual native library version number "53.0.2785.124"
V/WebViewChromiumFactoryProvider: Binding Chromium to main looper Looper (main, tid 1) {611ead6}
I/cr_LibraryLoader: Expected native library version number "53.0.2785.124", actual native library version number "53.0.2785.124"
I/chromium: [INFO:library_loader_hooks.cc(151)] Chromium logging enabled: level = 0, default verbosity = 0
I/cr_BrowserStartup: Initializing chromium process, singleProcess=true
W/cr_media: Requires BLUETOOTH permission
W/cr_AwContents: onDetachedFromWindow called when already detached. Ignoring
I/cr_Ime: ImeThread is not enabled.
E/libEGL: validate_display:255 error 3008 (EGL_BAD_DISPLAY)
W/cr_BindingManager: Cannot call determinedVisibility() - never saw a connection for the pid: 13399
I/DynamiteModule: Considering local module com.google.android.gms.tagmanager:8 and remote module com.google.android.gms.tagmanager:9
I/DynamiteModule: Selected remote version of com.google.android.gms.tagmanager, version >= 9
W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found.
W/GoogleTagManager: No container asset found in /assets/containers. Checking top level /assets directory for container assets.
W/GoogleTagManager: Tag Manager's event handler WILL NOT be installed (no container loaded)
I/GoogleTagManager: Tag Manager initilization took 213ms
V/FA: Using measurement service
V/FA: Connecting to remote service
D/FA: Connected to remote service
V/FA: Processing queued up service tasks: 1
I/Ads: Scheduling ad refresh 45000 milliseconds from now.
W/cr_AwContents: onDetachedFromWindow called when already detached. Ignoring
I/cr_Ime: ImeThread is not enabled.
I/Ads: Ad finished loading.
W/cr_BindingManager: Cannot call determinedVisibility() - never saw a connection for the pid: 13399
I/chromium: [INFO:CONSOLE(0)] "Document was loaded from Application Cache with manifest https://googleads.g.doubleclick.net/mads/static/mad/sdk/native/sdk-core-v40-loader.appcache", source: https://googleads.g.doubleclick.net/mads/static/mad/sdk/native/sdk-core-v40-loader.html (0)
I/chromium: [INFO:CONSOLE(0)] "Application Cache Checking event", source: https://googleads.g.doubleclick.net/mads/static/mad/sdk/native/sdk-core-v40-loader.html (0)
I/chromium: [INFO:CONSOLE(0)] "Application Cache NoUpdate event", source: https://googleads.g.doubleclick.net/mads/static/mad/sdk/native/sdk-core-v40-loader.html (0)
D/diffAnother: 1129000
D/DynamitePackage: Instantiating com.google.android.gms.ads.ChimeraAdManagerCreatorImpl
I/Ads: Starting ad request.
D/diffAnother: -6300000
W/cr_AwContents: onDetachedFromWindow called when already detached. Ignoring
I/cr_Ime: ImeThread is not enabled.
W/cr_BindingManager: Cannot call determinedVisibility() - never saw a connection for the pid: 13399
I/Ads: Scheduling ad refresh 45000 milliseconds from now.
I/Ads: Ad finished loading.
V/FA: Using measurement service
V/FA: Connecting to remote service
D/FA: Logging event (FE): _e, Bundle[{_o=auto, _et=29568, _sc=MainActivity, _si=-6311178554893906199}]
V/FA: Using measurement service
V/FA: Connection attempt already in progress
V/FA: Activity paused, time: 824808635
D/FA: Connected to remote service
V/FA: Processing queued up service tasks: 2
W/com.facebook.appevents.AppEventsLogger: activateApp events are being logged automatically. There's no need to call activateApp explicitly, this is safe to remove.
I/MaliEGL: [Mali]window_type=1, is_framebuffer=0, errnum = 0
I/MaliEGL: [Mali]surface->num_buffers=4, surface->num_frames=3, win_min_undequeued=1
I/MaliEGL: [Mali]max_allowed_dequeued_buffers=3
D/call1: called
D/call2: called
D/call1: called
D/call2: called
D/error1: ERROR1
D/error1: ERROR1
I/MaliEGL: [Mali]window_type=1, is_framebuffer=0, errnum = 0
I/MaliEGL: [Mali]surface->num_buffers=4, surface->num_frames=3, win_min_undequeued=1
I/MaliEGL: [Mali]max_allowed_dequeued_buffers=3
V/RenderScript: 0xb8457a88 Launching thread(s), CPUs 4
I/MaliEGL: [Mali]window_type=1, is_framebuffer=0, errnum = 0
I/MaliEGL: [Mali]surface->num_buffers=4, surface->num_frames=3, win_min_undequeued=1
I/MaliEGL: [Mali]max_allowed_dequeued_buffers=3
V/FA: Inactivity, disconnecting from the service
I/MaliEGL: [Mali]window_type=1, is_framebuffer=0, errnum = 0
I/MaliEGL: [Mali]surface->num_buffers=4, surface->num_frames=3, win_min_undequeued=1
I/MaliEGL: [Mali]max_allowed_dequeued_buffers=3
I/MaliEGL: [Mali]window_type=1, is_framebuffer=0, errnum = 0
I/MaliEGL: [Mali]surface->num_buffers=4, surface->num_frames=3, win_min_undequeued=1
I/MaliEGL: [Mali]max_allowed_dequeued_buffers=3
I/Ads: Ad is not visible. Not refreshing ad.
I/Ads: Scheduling ad refresh 60000 milliseconds from now.
I/Ads: Ad is not visible. Not refreshing ad.
I/Ads: Scheduling ad refresh 60000 milliseconds from now.
Application terminated.
I tried integrating crashlytics but even it doesn't show any error when the app crashes in this manner.
The question is how will I be able to fix the error if I don't even know what the error is?
Please help me with this.

I think the issue is related to your ad view.
In last line it is showing that ad is not visible.

How do you prevent android apps from crashing when you have many activities?

I'm new to android and am making an app which features many activities and a user prefs get edited during almost every one, and it seems that it randomly starts crashing 6 or 7 activities in, and opening up a different activity from a couple of pages ago, but only sometimes. I do everything exactly the same each time and I don't know what causes it to crash. Usually it will crash back to a different intent and let me continue from there. Here is the logcat after a crash:
10-31 13:01:52.122 2542-2542/? I/art: Not late-enabling -Xcheck:jni (already on)
10-31 13:01:52.253 2542-2542/? I/art: Rejecting re-init on previously-failed class java.lang.Class<android.support.v4.hardware.fingerprint.FingerprintManagerCompatApi23$1>
10-31 13:01:52.253 2542-2542/? I/art: Rejecting re-init on previously-failed class java.lang.Class<android.support.v4.hardware.fingerprint.FingerprintManagerCompatApi23$1>
10-31 13:01:52.360 2542-2542/? W/art: Before Android 4.1, method int android.support.v7.internal.widget.ListViewCompat.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView
10-31 13:01:52.516 2542-2558/? D/OpenGLRenderer: Render dirty regions requested: true
10-31 13:01:52.517 2542-2542/? D/: HostConnection::get() New Host Connection established 0xa66e01b0, tid 2542
10-31 13:01:52.522 2542-2542/? D/Atlas: Validating map...
10-31 13:01:52.569 2542-2558/? D/: HostConnection::get() New Host Connection established 0xa66e0260, tid 2558
10-31 13:01:52.578 2542-2558/? I/OpenGLRenderer: Initialized EGL, version 1.4
10-31 13:01:52.592 2542-2558/? D/OpenGLRenderer: Enabling debug mode 0
10-31 13:01:52.602 2542-2558/? W/EGL_emulation: eglSurfaceAttrib not implemented
10-31 13:01:52.602 2542-2558/? W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xa66b4b20, error=EGL_SUCCESS