Arduino Android Communication Bluetooth Code

const int led = 12;
char data = 0;            
void setup()
{
    Serial.begin(9600);   
    pinMode(led, OUTPUT);  
}
void loop()
{
   if(Serial.available() > 0)      
   {
      data = Serial.read();        
      if(data == '1')              
         digitalWrite(led, HIGH);  
      else if(data == '0')         
         digitalWrite(led, LOW);    
   }
}