fix#1074 : App crashes while switching between SIFragment (or HistoryFragment) and SendFragment

[Me-Abhishek-patel]

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Issue Fix

Fixes #1074

Description

Checking if SIFragment is in foreground ( visible ) before doing further processes fixes the crash.

• [x] Apply the AndroidStyle.xml style template to your code in Android Studio.

• [x] Run the unit tests with ./gradlew check to make sure you didn't break anything

• [x] If you have multiple commits please combine them into one commit by squashing them.

[Me-Abhishek-patel]

@shiv07tiwari @devansh-299 @robustTechie Please review this PR.

[Prashant830]

@Me-Abhishek-patel I think, In your branch have a code conflict . Are u still able to resolved it??