How to know change in network connection in android

How to know whether there is any netwo开发者_如何转开发rk connection switch or network connection lost in my application.

you can use the ConnectivityManager in Android:

ConnectivityManager cm = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo net = cm.getActiveNetworkInfo();
if(net != null && net.isConnected()) {
    // we have connection
}

Edit: Checking for internet connection requires some permissions as well:

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

You can refer my post over here for network switch and checking connection: (Note: I have posted answer below question in that post)

How to handle WiFi to Mobile network switch programatically?

You have to add some permissions in AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />