Extra Notes



https://stackoverflow.com/questions/30731121/how-can-i-return-an-arraylist-from-my-asynctask


class chargeCars extends AsyncTask<Void, Integer, ArrayList<Car>> {

    private final OnCarsListener mListener;
    ArrayList<Car> cars = new ArrayList<Car>();

    public chargeCars(OnCarsListener listener) {
         mListener = listener;
    } 

    protected void onPreExecute(){
    }

    protected ArrayList<Car> doInBackground(Void... params) {

        cars.add(new Car(1,"Car1");
        cars.add(new Car(2,"Car2");
        cars.add(new Car(3,"Car3");

        Log.d("Size: ", "" + cars.size()); //It gives me the size equals to 3 -->Correct 
        return cars;

    }

    protected void onProgressUpdate(){
    }

    protected void onPostExecute(ArrayList<Car> cars){
         if (mListener != null) {
              mListener.onCarsCompleted(cars);
         } 
    }


}




String Manipulation

Java String substring

String s1="javatpoint";  
System.out.println(s1.substring(2,4));//returns va  
System.out.println(s1.substring(2));//returns vatpoint  





Java String indexOf() method example

https://www.javatpoint.com/java-string-indexof

public class SubstringExample{
public static void main(String args[]){
String s1="ID=1001131141 Body Tem";



 int index=  s1.indexOf("Body",0);
System.out.println( index+"");
System.out.println(s1.substring(3,index));//returns va

}}



---------------------------------
//To capture the ID 19787 from the string "19787 : chicken 10 5"


public class SubstringExample{
public static void main(String args[]){
String s1="19787 : chicken 10 5";

int index=s1.indexOf(":",0);
System.out.println( index+"");
System.out.println(s1.substring(0,index));// returns the ID 19787

}}

https://compiler.javatpoint.com/opr/test.jsp?filename=SubstringExample
-------------------------------------

Java String charAt()

String name="javatpoint";  
char ch=name.charAt(4);//returns the char value at the 4th index  
System.out.println(ch);  

https://www.javatpoint.com/java-string-charat

For Dafid

//Partial codes
//calculate GPA

double cGPA =0.0;
int totalCU=0;

select * from subjectlist

{

while cursor.next ()
{

int cu = Integer.parseInt ( ....getString("SubjCU"));
String sGrade = ( ....getString("SubjGrade"));
int gradePt =0;


if (sGrade.equals("A") )
{
     gradePt = 4;
} 

totalCU+= cu ;
cGPA  += cu*gradePt

}


double gpa = cGPA  /totalCU;



}

For Nuralif

 //After click Pay button
//insert the ID and the Date and time  into Sqlite DB

//Test it on your AVD
//If it works

Add one page in your report
Show the screenshot of the AVD and DDMS db to show that it works.

and the coding for Pay

#1 Pass the ID from  QR code Page to Pay Page
see putExtra                                    and getExtra


#2 Pay Page
i)  getExtra for the prodID

example prodID = .............................

ii) get current date and time



 public class SubstringExample{

 public static void main(String[] args) {


    String pattern = "MM/dd/yyyy";
    java.text.SimpleDateFormat format = new java.text.SimpleDateFormat(pattern);
    try {
      java.util.Date date = format.parse("12/31/2006");
     // System.out.println(date);
    } catch (java.text.ParseException e) {
      e.printStackTrace();
    }
    // formatting
    String todayDate = format.format(new java.util.Date());

System.out.println(todayDate );
  }
}

//Compile by: javac SubstringExample.java
//Run by: java SubstringExample

02/14/2018

https://compiler.javatpoint.com/opr/test.jsp?filename=SubstringExample


iii) create table if not exists ......

shoppingCart (id, dateTime)


iv)insert into sqlite DB

insert into shoppingCart (id, dateTime) values ('"+ prodID   + "','"+todayDate +"'")


#3 if works screenhsot the output of the AVD and DDMS db to show that it works
and put in your report.




//Luqman

public class SubstringExample{
public static void main(String args[]){
String s1="ID=10686888686 Car: Toyota 2000cc";



int index=  s1.indexOf("Car",0);
System.out.println( index+"");
System.out.println(s1.substring(3,index));//returns va

}}

https://compiler.javatpoint.com/opr/test.jsp?filename=SubstringExample



//Khaidhir & Neo ZX
Lab13+ New activity (Search)
a) Search for places
b) display the name, lat/long, distance from current location in metres
//for Jody
// Random Number
public class SubstringExample{
public static void main(String args[]){

 double num = Math.floor((Math.random() * 100) + 1);
int num2 = (int) num;

System.out.println(num2); 

}}
at