//manitor tamas

public class PhoneCallListener extends PhoneStateListener {
	        	 
	        	private boolean onCall = false;
	        	 
	    		@Override
	    		public void onCallStateChanged(int state, String incomingNumber) {
	     
	    			
	    			
	    			
	    			
	    			switch (state) {
	    			case TelephonyManager.CALL_STATE_RINGING:
	    				// phone ringing...
	    				Toast.makeText(Page3Activity.this, incomingNumber + " tamas shoma", 
	    						Toast.LENGTH_LONG).show();
	    				break;
	    			
	    			case TelephonyManager.CALL_STATE_OFFHOOK:
	    				// one call exists that is dialing, active, or on hold
	    				
	    				//because user answers the incoming call
	    				
	    				onCall = true;
	    				Toast.makeText(Page3Activity.this, "dr hal tamas", 
	    						Toast.LENGTH_LONG).show();
	    				
						}
	    				break;

	    			case TelephonyManager.CALL_STATE_IDLE:
	    				// in initialization of the class and at the end of phone call 
	    				
						}
	    				// detect flag from CALL_STATE_OFFHOOK
	    				if (onCall == true) {
	    					Toast.makeText(Page3Activity.this, "back be barname", 
	    							Toast.LENGTH_LONG).show();
	     
	    					// restart our application
	    					Intent restart = getBaseContext().getPackageManager().
	    						getLaunchIntentForPackage(getBaseContext().getPackageName());
	    					restart.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
	    					startActivity(restart);
	     
	    					onCall = false;
	    				}
	    				break;
	    			default:
	    				break;
	        	                }
	        	 
	        	            
	    		}
	        }