App crash after Sign out and Sign in again

[balaji-ramavathu]

Describe the issue
After sign out, if we sign in again, app crashes

To Reproduce or Feature details
Steps to reproduce the behavior:

1. Go to Settings
2. Click on Sign out
3. Try to Sign in again
4. Boom

Logs
E/AndroidRuntime: FATAL EXCEPTION: main
Process: org.amahi.anywhere, PID: 30957
java.lang.IllegalArgumentException: context is null
at android.accounts.AccountManager.get(AccountManager.java:449)
at org.amahi.anywhere.fragment.NavigationFragment.getAccountManager(NavigationFragment.java:132)
at org.amahi.anywhere.fragment.NavigationFragment.getAccounts(NavigationFragment.java:168)
at org.amahi.anywhere.fragment.NavigationFragment.setUpAuthenticationToken(NavigationFragment.java:176)
at org.amahi.anywhere.fragment.NavigationFragment.run(NavigationFragment.java:191)
at android.accounts.AccountManager$18.run(AccountManager.java:2176)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:101)
at android.os.Looper.loop(Looper.java:166)
at android.app.ActivityThread.main(ActivityThread.java:7529)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:245)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:921)

Expected behavior
App should not crash.

Smartphone :

• Device: huawei honor 7x
• OS: Oreo (8.0)

Additional context
Actually, there's no problem in signing in part, except that the NavigationFragment is getting a null Context due to which the exception arises and hence the crash.

@cpg I am working to fix this :-)

[Bluesachinkr]

@balaji-ramavathu Can i work in that issue as well ? if allow