NewPostActivity: Introduce AtUserSuggestTextView for suggestions

Signed-off-by: Peter Cai <xqsx43cxy@126.com>
NewPostActivity: use Gravity.RIGHT instead of Gravity.END

Signed-off-by: Peter Cai <xqsx43cxy@126.com>
WeiboAdapter: clean up

Signed-off-by: Peter Cai <xqsx43cxy@126.com>
CircularProgressView: calculate font size from dp

Signed-off-by: Peter Cai <xqsx43cxy@126.com>