[android-developers] How to start an activity in a try/catch bloc

Hi,
I just want to add an alertdialog when receiving a call, however i
don't know how doing it.
I have made this:
Intent i = new Intent(this,Preferences.class);
startActivity(i);

But it ends with an error in each line!

public class IncomingCallReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
SipAudioCall incomingCall = null;
try {
Intent i = new Intent(this,Preferences.class);
startActivity(i);

SipAudioCall.Listener listener = new
SipAudioCall.Listener() {
@Override
public void onRinging(SipAudioCall call, SipProfile
caller) {

How can i solve this problem?
Thank you for your help.

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