If your Android Wi-Fi client still cannot connect, get a valid IP address or ping any other system connected to the same subnet, it's time to look for wireless-specific problems.The AP/router and client must use compatible 802.11 standards.
Start by verifying that a wireless access point (AP) or router is nearby and actively offering Wi-Fi service.
Always start here, using another Wi-Fi client to determine which is the likely culprit, the network or the client.
If multiple clients are unable to connect, follow instructions in our wireless network troubleshooting tip to debug probably AP or router or upstream network problems.
Otherwise, proceed to step 2 to debug the affected Android client. Before going any further, make sure that your Android device's Wi-Fi radio is not in Airplane Mode and that Wi-Fi is on and ready to connect.
Tap Settings If Wi-Fi is off, tap the slider to turn Wi-Fi on.
When Wi-Fi is on, a signal indicator appears at the top right corner of your home screen.Properly connected Wi-Fi takes precedence over mobile broadband, but it can be helpful to disable your device's mobile network connection while debugging Wi-Fi.Note that whenever you're trying to connect an Android Wi-Fi client to any network name, status is displayed on the Wi-Fi Settings panel, in the row labeled Wi-Fi.When status is Connected, tap Advanced to view the client's assigned IP address.Once your Android Wi-Fi client has a valid IP address, use Ping to verify network connectivity.Most Android devices do not include a user-accessible ping app, but you can still verify network connectivity as follows.