Android : Not work Every time PhoneStateListener Android

I have Developing Application of Full Caller Id. In that dynamic screen call at the time of Incoming call / After Missed Call. Now this is work one time. When i received call. Than after it is not work or Not call any dynamic screen at the time Incoming call/ Missed call.

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I have very confuse about my problem.

Context c;
boolean cut, flag = true;
PhoneStateListener listener;
SharedPreferences prefs;
static boolean ring = false;
static boolean callReceived = false;

public MyPhoneStateListener(Context c) {
    // TODO Auto-generated constructor stub
    this.c = c;
}

@Override
public void onCallStateChanged(int state, String incomingNumber) {
    super.onCallStateChanged(state, incomingNumber);

    Log.d("main", "incoming call receiver.");
    PowerManager pm = (PowerManager) c
            .getSystemService(Context.POWER_SERVICE);
    boolean isScreenOn = pm.isScreenOn();

    switch (state) {
    case TelephonyManager.CALL_STATE_IDLE:
        Log.v("idle state", "CALL_STATE_IDLE");
        // CALL_STATE_IDLE;


        if (ring == true && callReceived == false && CheckMissCall.isReject==false) {

            Log.v("missed call", "Missed call from : " + incomingNumber);
            if(CheckMissCall.isShown)
            {
                c.stopService(new Intent(c, Unlock_hud.class));

            }

            flag = true;
            if (prefs.getBoolean("main_state", true))
            {
                Intent inter = new Intent(c, MissCall.class);
                inter.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                inter.putExtra("CellNumber", incomingNumber);
                c.startActivity(inter);
            }

        }       

        if(ring == true && callReceived == true && CheckMissCall.isReject == true)
        {
            Intent inter = new Intent(c, callLog.class);
            inter.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);          
            c.startActivity(inter); 
        }       
        break;


    case TelephonyManager.CALL_STATE_OFFHOOK:
        // CALL_STATE_OFFHOOK;
        callReceived = true;
        Log.v("call received", "CALL_STATE_OFFHOOK  " + incomingNumber);
        break;


    case TelephonyManager.CALL_STATE_RINGING:
        ring = true;
        // CALL_STATE_RINGING
        Log.v("call ringing", "CALL_STATE_RINGING  " + incomingNumber);
        Log.d("flags", "flags: " + flag);
        if (flag) {

            //cut = true;
            //flag = false;
            CheckMissCall call = new CheckMissCall(c);
            call.setName(incomingNumber);
            call.setNumber4Sms(incomingNumber);
            call.setContactPhoto();

            Log.d("main", "state ringing");
            prefs = PreferenceManager.getDefaultSharedPreferences(c);

            if (!prefs.getBoolean("main_state", false)) {

                return;
            }
        /*  if (!isScreenOn && CheckMissCall.isRunning) {

                return;
            }*/
            if (CheckMissCall.isRunning) {

                return;
            }
            else {
                Log.d("main", "EEEEEEEEEEEEEEEE:  Unlock hud");
                Intent in = new Intent(c, Unlock_hud.class);
                in.setFlags(Intent.FLAG_ACTIVITY_PREVIOUS_IS_TOP);
                c.startService(in);

                // c.stopService(new Intent(c, Unlock_hud.class));
            }
        }
        break;



    }



}