nullpointer exception on connectivitymanager

public boolean isOnline() {
    ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    return cm.getActiveNetworkInfo().isConnectedOrConnecting();}

I'm getting a开发者_JAVA百科 nullpointer on return cm.getActiveNetworkInfo.

I tried this.getSystemService but also didn't work. Maybe its because my activity extends a super activity i've created and I'm grabbing the context incorrectly...? tried getBaseContext() too

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With two methods chained together on the return line, are you sure it's the ConnectivityManager coming back null? It's perfectly valid for ConnectivityManager.getActiveNetworkInfo() to return null instead of a valid NetworkInfo object when there is no active network. If this comes back null, then it is the call to NetworkInfo.isConnectedOrConnecting() that is throwing the exception.

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Guess #1:

Do you have these in your manifest?

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