Implemented clearBadge for Android

[Alex-Sessler]

Description

I added the init parameter "clearBadge" which is treated the same as the others and stored to SharedPreferences. If it's set, the app sets the badge number to 0 on init. Also, when a notification is receviced, the badge number is immediately cleared in order to leave the config of the badge through notification parameter untouched. Now when a notification is recevied, the badge is cleared before the notification content is processed, therefore any badge numbers set in the notification will be respected. I tried to implement this as close to the iOS implementation as possible.

Related Issue

#999

Motivation and Context

Even though I was not setting the Badge Number, it was some times (on specific devices) appearing out of nowhere after init. I wanted to have a way to make sure that the Badge Number is not shown by accident.

How Has This Been Tested?

I manually added a badge number through the "setApplicationBadgeNumber" function. Then I restarted the app causing the init function to trigger. The badge number was immediately cleared. I also set the BadgeNumber after init and sent a notification that had no badge number arguments. The badge number was also cleared immediately.

I only did manual tests on Android devices.

There shouldn't be any unexpected side effects on other code.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[macdonst]

Thanks @Alex-Sessler

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