Supporting RTL languages on Android, Bidi (Bidirectional) text

Recently I've found myself spending a lot of time trying to make sure things look nice on both LTR as well as RTL locales, so that folks with UIs in Arabic, Hebrew, Persian, or Urdu can also have an A+ experience on Android. I ran into an annoying problem where international phone numbers, such as +9708675309 would show up in the app as 9708675309+. The issue was that in RTL languages, numbers should be LTR, so the phone number portion was displayed correctly, but unfortunately the + was displayed on the right side of the phone number. After a good amount of Googling, the fix is actually really simple. Just place the Left-to-Right Isolate Unicode mark on the left of the text you want to be LTR, and then place the Pop Directional Isolate Unicode mark on the right of the text, so that it doesn't make the entire rest of the text LTR. It looked sort of like this in Kotlin: "\u2066+9708675309\u2069" and it worked like a charm!

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