How to type on LCD using Bluetooth

1#include <LiquidCrystal_I2C.h>  //For defining the lcd
2#include <Wire.h>               //Same here too
3LiquidCrystal_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.
4char data = '5'; //Variable for storing received data  
5int xpos=0;//Columm  of the LCD
6int ypos=0;//Row of the LCD
7
8void setup() {
9  // put your  setup code here, to run once:
10    Serial.begin(9600); //Sets the baud for serial  data transmission 
11    lcd.begin(16,2);//Setting up the lCD
12    lcd.clear();//Clearing  the waste                            
13
14}
15
16void loop() {
17  // put  your main code here, to run repeatedly:
18  if(Serial.available() > 0)  // Perform  only when you receive data:  
19   {  
20      data = Serial.read();         
21if(data=='-'){//That  means if we insert backspace key - in the android app
22  xpos--; //Delete it -  come back one character
23if (xpos<0 && ypos==1) //if already reached to beginning  of line2
24 {
25  ypos=0; //come to line 1
26  xpos=15; //last column
27 }
28  
29  Serial.print("Backspace received: xpos=");//Testing if the backspace key  works
30  Serial.println(xpos);
31  lcd.setCursor(xpos,ypos);
32  lcd.blink();//Knowing  where are we inserting backspace key
33  lcd.print(" ");
34  lcd.setCursor(xpos,ypos);
35  
36  
37  
38}
39else{ //else print the data
40  lcd.setCursor(xpos,ypos);  //set the chracter location
41   lcd.print(data); //print character on LCD
42   Serial.println(xpos); // for debug
43   lcd.noBlink(); //remove any blinking  if set due to backspace
44xpos++; // increase the column position
45}
46if(xpos>15){//if  the first line is full,
47  xpos=0; //Goto first column of
48  ypos++;//the next  line.
49}
50if(xpos<0)
51{xpos=0;
52  
53}
54
55}
56
57}//Have fun!!!!
58