Revert "import ContentResolver for network activity"

This reverts commit 82b03e673d8fee0f0208b2c71cb70a884b7192c6.
Revert "fix typo... missing }"

This reverts commit f8d038feff7c90465dda78e15826c88d181c5ebc.
Revert "add statusbar Network Activity"

This reverts commit 894aefc07457d273b1b53665a28ae79125b3dd56.
add and fix network activity indicators