Firebase crash reports are de-perfused without line numbers

Question

Currently crash reports are displayed as

Exception java.lang.NullPointerException:
com.temp.app.Helper.convertToString (Helper.java: (no line number here) )
com.temp.app..fragment.FragmentEnterName $ 6.run (FragmentEnterName.java: (no line number here) )
android.os.Handler.handleCallback (Handler.java:733)
android.os.Handler.dispatchMessage (Handler.java:95)
android.os.Looper.loop (Looper.java:146)
android.app.ActivityThread .main (ActivityThread.java<6969)
java.lang.reflect.Method.invokeNative (Method.java)
java.lang.reflect.Method.invoke (Method.java►15)
com.android.internal.os.ZygoteInit $ MethodAndArgsCaller .run (ZygoteInit.java:1291)
com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1107)
dalvik.system.NativeStart.main (NativeStart.java)

but it should be like

Java.lang.NullPointerException exception: com.temp.app.Helper.convertToString ( Helper.java:25 )
com.temp.app..fragment.FragmentEnterName $ 6.run ( FragmentEnterName.java:15 )
android.os.Handler.handleCallback (Handler.java:733)
android.os.Handler.dispatchMessage (Handler.java:95)
android.os.Looper.loop (Looper.java:146)
android.app.ActivityThread.main (ActivityThread.java UP692 )
java .lang.reflect.Method.invokeNative (Method.java)
java.lang.reflect.Method.invoke (Method.java
=15 ) com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.java:1291)
com .android.internal.os.ZygoteInit.main (ZygoteInit.java:1107)
dalvik.system.NativeStart.main (NativeStart.java)

default proguard-android.txt, sdk\tools\proguard\proguard-android.txt

# This is a configuration file for ProGuard.
# http://proguard.sourceforge.net/index.html#manual/usage.html
#
# Starting with version 2.2 of the Android plugin for Gradle, these files are no longer used. Newer
# versions are distributed with the plugin and unpacked at build time. Files in this directory are
# no longer maintained.

-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-verbose

# Optimization is turned off by default. Dex does not like code run
# through the ProGuard optimize and preverify steps (and performs some
# of these optimizations on its own).
-dontoptimize
-dontpreverify
# Note that if you want to enable optimization, you cannot just
# include optimization flags in your own project configuration file;
# instead you will need to point to the
# "proguard-android-optimize.txt" file instead of this one from your
# project.properties file.

-keepattributes *Annotation*
-keep public class com.google.vending.licensing.ILicensingService
-keep public class com.android.vending.licensing.ILicensingService

# For native methods, see http://proguard.sourceforge.net/manual/examples.html#native
-keepclasseswithmembernames class * {
    native <methods>;
}

# keep setters in Views so that animations can still work.
# see http://proguard.sourceforge.net/manual/examples.html#beans
-keepclassmembers public class * extends android.view.View {
   void set*(***);
   *** get*();
}

# We want to keep methods in Activity that could be used in the XML attribute onClick
-keepclassmembers class * extends android.app.Activity {
   public void *(android.view.View);
}

# For enumeration classes, see http://proguard.sourceforge.net/manual/examples.html#enumerations
-keepclassmembers enum * {
    public static **[] values();
    public static ** valueOf(java.lang.String);
}

-keepclassmembers class * implements android.os.Parcelable {
  public static final android.os.Parcelable$Creator CREATOR;
}

-keepclassmembers class **.R$* {
    public static <fields>;
}

# The support library contains references to newer platform versions.
# Don't warn about those in case this app is linking against an older
# platform version.  We know about them, and they are safe.
-dontwarn android.support.**

# Understand the @Keep support annotation.
-keep class android.support.annotation.Keep

-keep @android.support.annotation.Keep class * {*;}

-keepclasseswithmembers class * {
    @android.support.annotation.Keep <methods>;
}

-keepclasseswithmembers class * {
    @android.support.annotation.Keep <fields>;
}

-keepclasseswithmembers class * {
    @android.support.annotation.Keep <init>(...);
}

Answer 1

proguard firebase:

-renamesourcefileattribute SourceFile
-keepattributes SourceFile,LineNumberTable