Google Android - how to figure out if 3g and 2g is turned on

问题

I'm developing a simple application for the Google Android to turn on and off the wifi or 3g or 2g.

I see http://developer.android.com/reference/android/net/wifi/WifiManager.html#isWifiEnabled() that you can see if the wifi is enabled or disabled and also us http://developer.android.com/reference/android/net/wifi/WifiManager.html#setWifiEnabled(boolean) to turn on and off the wifi.

I'm wondering if it's possible to do the same for 3G and for 2G/GPRS? I know it's possible because you can turn off 3G and left 2G on.

回答1:

2G/3G

To determine your network type use:

TelephonyManager.getNetworkType();

here's some example code:

bool is3G = (manager.getNetworkType() == TelephonyManager.NETWORK_TYPE_UMTS);

Docs for the class can be found at: TelephonyManager

On/Off

To check if your telephone radio is on or off use:

ServiceState.getState();

To set it use:

ServiceState.setState(STATE_POWER_OFF);

It's unclear whether the setState method exists on all devices and functions in all states. There is no documentation for this method. Documentation for the class can be found at: ServiceState

This issue might also be relevant: http://code.google.com/p/android/issues/detail?id=1065

回答2:

You can also use ConnectivityManager. Something like that:

ConnectivityManager connectivityManager =(ConnectivityManager)mContext.getSystemService(Context.CONNECTIVITY_SERVICE); 
NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();

来源：https://stackoverflow.com/questions/763972/google-android-how-to-figure-out-if-3g-and-2g-is-turned-on