Question Description

Hello

I have a defficiclty to understand this android code. In fact, I need to build an apk for it, so can you help me on this.

# define an xml file that fits with code in order to make the app work appropriately.

# a functional all for this code..

============================ the code==========

import android.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

private int cartCount=0;
private int totalPrice=0;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

public void AddBaby(View view) {
TextView editText = (TextView) findViewById(R.id.tvBDPrice);
int price = Integer.parseInt(editText.getText().toString());
totalPrice = totalPrice + price;

TextView tvCartCount = (TextView) findViewById(R.id.tvTotal);
cartCount = cartCount + 1;
tvCartCount.setText(String.valueOf(cartCount));
}

public void AddJunior(View view){
TextView editText = (TextView) findViewById(R.id.tvJDPrice);
int price = Integer.parseInt(editText.getText().toString());
totalPrice = totalPrice+price;

TextView tvCartCount= (TextView) findViewById(R.id.tvTotal);
cartCount=cartCount+1;
tvCartCount.setText(String.valueOf(cartCount));
}

public void AddAdult(View view)
{
TextView editText = (TextView) findViewById(R.id.tvADPrice);
int price = Integer.parseInt(editText.getText().toString());
totalPrice = totalPrice+price;

TextView tvCartCount= (TextView) findViewById(R.id.tvTotal);
cartCount=cartCount+1;
tvCartCount.setText(String.valueOf(cartCount));
}
public void CheckOut(View view)
{
if (cartCount==0)
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Please add atleast one item to the cart before checkout")
.setTitle ("Empty cart");
AlertDialog alert= builder.create();
alert.show();
}
else
{
EditText editText= (EditText) findViewById(R.id.etShipping);
String shippingInfo= editText.getText().toString();

AlertDialog.Builder builder= new AlertDialog.Builder(this);
builder.setMessage("You have purched" + cartCount + "Item.\nTotal price:"+ totalPrice + ".\nShipping Instruction:"+ shippingInfo+ ".")
.setTitle("Checkout Sucess");

AlertDialog alert=builder.create();
alert.show();
}
}
public int getCartCount(){
return cartCount;
}
public void setCartCount(int cartCount)
{
this.cartCount=cartCount;
}

public int getTotalPrice() {
return totalPrice;
}

public void setTotalPrice(int totalPrice) {
this.totalPrice = totalPrice;
}
}

=========================== the end of the code=========