Case 1: People: No person can access your text messages to 3rd party vwithout any kind of physical access...Hacking may be an option but meagre possibility in case of text messages.As no use of data in sms.
Case 2: Applications: Some applications have direct access to text messages,but they are all trusted sources permitted by google play store...And i don't see any reason to doubt google though
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If you're on Android, Google Hangouts is the default for messaging with other Android (and Google) users. ... If you want a simple way to communicate with people between different devices, third-party messaging client make things easy. That's where apps like WhatsApp or Snapchat comes in
End-to-end encryption means that messages are encrypted on the sender's device and only the recipient can decrypt them..Other user favorite chat apps including Facebook Messenger, Snapchat, Kik, Skype, and Yahoo Messenger only offer in-transit encryption, which means they could be accessed by a third party.