toast message android

I am trying to pop up a toast message as long as the phone rings and destroy the toast them the call is rejected or answered.

In the OnReceive method I have something like this:

Bundle bundle=intent.getExtras();
 final String state=bundle.getString(TelephonyManager.EXTRA_STATE);
 
 if (state.equalsIgnoreCase(TelephonyManager.EXTRA_STATE_RINGING))
 {
   Toast toast= new Toast(context);
   toast.show();
 
   new CountDownTimer(3500,1000)
 {
 
 @Override
 public void onFinish()
 {
   if (state.equalsIgnoreCase(TelephonyManager.EXTRA_STATE_IDLE)||
      (state.equalsIgnoreCase(TelephonyManager.EXTRA_STATE_OFFHOOK))
   {
     toast.cancel();
   }
   else
   {
     toast.setDuration(Toast.LENGTH_LONG);
     toast.show();
     start();
   }
 }
 

The problem is that even after the call is hanged up the toast message keeps poping up. It's like the state is never in the HANG_UP or IDLE Mode.

What did I do wrong?

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