How to type on LCD using Bluetooth

#include <LiquidCrystal_I2C.h>  //For defining the lcd
#include <Wire.h>               //Same here too
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);//This is the  address of the LCD.If you have another address,change it.
char data = '5'; //Variable for storing received data  
int xpos=0;//Columm of the LCD
int ypos=0;//Row of the LCD

void setup() {
  // put your setup code here, to run once:
    Serial.begin(9600); //Sets the baud for serial data transmission 
    lcd.begin(16,2);//Setting up the lCD
    lcd.clear();//Clearing the waste                            

}

void loop() {
  // put your main code here, to run repeatedly:
  if(Serial.available() > 0)  // Perform only when you receive data:  
   {  
      data = Serial.read();         
if(data=='-'){//That means if we insert backspace key - in the android app
  xpos--; //Delete it - come back one character
if (xpos<0 && ypos==1) //if already reached to beginning of line2
 {
  ypos=0; //come to line 1
  xpos=15; //last column
 }
  
  Serial.print("Backspace received: xpos=");//Testing if the backspace key works
  Serial.println(xpos);
  lcd.setCursor(xpos,ypos);
  lcd.blink();//Knowing where are we inserting backspace key
  lcd.print(" ");
  lcd.setCursor(xpos,ypos);
 
  
  
}
else{ //else print the data
  lcd.setCursor(xpos,ypos); //set the chracter location
   lcd.print(data); //print character on LCD
   Serial.println(xpos); // for debug
   lcd.noBlink(); //remove any blinking if set due to backspace
xpos++; // increase the column position
}
if(xpos>15){//if the first line is full,
  xpos=0; //Goto first column of
  ypos++;//the next line.
}
if(xpos<0)
{xpos=0;
  
}

}

}//Have fun!!!!