How to detect when phone is answered or rejected

Question

I managed to prepare an activity when the phone is ringing. Now I need to know how to cancel this activity, when I answer the phone or I reject the call.Do I call EXTRA_STATE_IDLE or EXTRA_STATE_OFFHOOK ?

Any ideas?

Manifest

    <receiver android:name=".IncomingBroadcastReceiver">
        <intent-filter>
            <action android:name="android.intent.action.PHONE_STATE" />
        </intent-filter>
    </receiver>

IncomingBroadcastReceiver java Class

public class IncomingBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        String state = intent.getStringExtra(TelephonyManager.EXTRA_STATE);
        // If an incoming call arrives
        if (state.equals(TelephonyManager.EXTRA_STATE_RINGING)) { //Did my work }

Answer 1

The above answer is completely wrong in case of outgoing calls. In Android there is no way by which one detect whether the call was actually answered (in case of outgoing calls). The moment you dial a number, the off_hook state is fired. This is one of the drawbacks of Android programming.