Method Number 1
First of all you have to download Wi-Fi WPS WPA TESTER from Google Play Store
This app can hack only WPS & WPA routers. It cannot Hack WPA2 Router to hack password. and it only support Latest Version of Android, Android 5.O or later then it so your android must be updated.
1. Install the Wi-Fi WPS WPA TESTER from Google Play Store and open the app.
Also Read: Best Hacking Apps for Android Phones 2016
2. Click onto the Refresh button it will show your available networks.
3. If it shows a red icon after network name then it cannot hack it and if it show green icon then it can hack the password.
4. Select the Green network.
5. Now click on connect automatic pin it will try to connect to network with its designed algorithm, and will take maximum 1 minute to show you the results.
If you do not get success with this method I mean app then there is a second app which is more powerful than this one and can also try to hack WPS protected networks.