Is Android hacking only limited to payload installation? (For Ethical/Educational Purposes only)

I am a beginner to ethical hacking and was recently reading about Android exploits. All I can see are payload methods (installing an app). Is this the only way to break through the system? Or are there other tried and tested ways to exploit Android mobile devices?

submitted by /u/kristianism
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from hacking: security in practice https://ift.tt/2J9GKjH