Networking
Many Android applications transfer data between the device and a server, or between devices. Like the battery state, applications may need to retrieve information about the network connections on the device. The ConnectivityManager class provides APIs applications can call to have access to the network information. Android devices often have multiple data connections available:
- Bluetooth
- Ethernet
- Wi-Fi
- WiMAX
- Mobile (EDGE, UMTS, LTE)
Listing 7–6 shows how to retrieve information about the active connection as well as all the connections.
Listing 7–6. Network Information
private void showNetworkInfoToast() {
ConnectivityManager cm = (ConnectivityManager)
getSystemService(Context.CONNECTIVITY_SERVICE);
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