Develop Reference

Setting max_Retrieve and sort_list parameter in getListEntryObjects

I am a newbie in AR System Java API.
I was going trough the code the below code.
String formName = "some_formname";
String qualificationString = "$1$ = \"" + entryId + "\"";
int firstRetrieve = 0;
int max_Retrieve = 0;
List sort_list = null;
boolean UseLocale = false;
OutputInteger nmatches = null;
ARServerUser=context
Myentries = context.getListEntryObjects(formName, qualification, firstRetrieve, max_Retrieve , sort_list, fieldIds, UseLocale, nmatches);
This returns 0 entires. I suspect if its due to the max_Retrieve and sort_list. I dont know the total or maximum entries present. Please provide any inputs on why this is returning 0 entries, and how can I get the required entries from this statement.

Instead of passing a 0, pass Constants.AR_NO_MAX_LIST_RETRIEVE

Use csv data as string java

This maybe simple but java isn’t really my thing but I'm working with a java API.
I need to parse a csv file and use the values as strings.
CSV file:
Mac,device,level ,key number,key function ,name,number,prim
01:1A:E8:84:9D:27,0,0,1,31,line,441865945218,TRUE
01:1A:E8:84:9D:27,0,0,2,51,dss,441865985452,FALSE
each row need to be read seprately so something like.
Read first row of csv
Assign values to strings (e.g. mac = 01:1A:E8:84:9D:27 device = 0 and so on)
Run "code" using these strings
Read second row of csv
So on till end of csv.
Thanks
I have tried csvreader but I'm not able to use the strings outside of the while function and it does not read line by line.
CsvReader phones = new CsvReader("dls.csv");
phones.readHeaders();
while (phones.readRecord()){
String deviceID = phones.get("Mac");
String device = phones.get("device");
String level = phones.get("level");
String keynumber = phones.get("key number");
String keyfunction = phones.get("key Function");
String label = phones.get("name");
String e164 = phones.get("number");
String prim = phones.get("prim");
}

As you are new to Java, whatever you are doing, looks like it reads the file line by line. But as you are defining the Strings in while loop, you won't be able to access it outside.
If you want to read all lines and store in Strings, you should probably take array for all of them and define them outside the while loop, add values in the loop and then you'll be able to use it.
Or just create a Phone class:
public class Phone{
String deviceId;
String device;
......etc...
//setters and getters
}
And take an array of it outside while. Something like this:
CsvReader phones = new CsvReader("dls.csv");
phones.readHeaders();
List<Phone> phonesArr=new ArrayList<Phone>();
while (phones.readRecord())
{
Phone phone=new Phone();
phone.setDeviceId(phones.get("Mac"));
phone.setDevice(phones.get("device"));
.....
phones.add(phone);
}
// array phones will be accessible here
Hope that helps!

You have to declare the Strings outside of the loop. Otherwise the String variables would be loop scoped.
CsvReader phones = new CsvReader("dls.csv");
phones.readHeaders();
String deviceID;
String device;
String level;
String keynumber;
String keyfunction;
String label;
String e164;
String prim;
while (phones.readRecord()){
deviceID = phones.get("Mac");
device = phones.get("device");
level = phones.get("level");
keynumber = phones.get("key number");
keyfunction = phones.get("key Function");
label = phones.get("name");
e164 = phones.get("number");
prim = phones.get("prim");
}
See:
Scopes tutorial
Javadoc: Variables

In the end I just called the funtion from the while loop.
while (phones.readRecord()) {
deviceID = phones.get("Mac");
Device = phones.get("device");
Level = phones.get("level");
Keynumber = phones.get("key number");
Keyfunction = phones.get("key function");
Label = phones.get("name");
E164 = phones.get("number");
Prim = phones.get("prim");
tools connect = new tools();
connect.connect();
connect.setkeys(deviceID,Device,Level,Label,Keynumber,Keyfunction,E164,Prim);
//System.out.println(Prim);
}
phones.close();

Adding HashSet/Array to HashMap error

I am a beginner at Java, and I'm having trouble understanding why I'm getting an error. I have a .csv file containing cities, provinces, and respective populations of Canada. I have been trying to read the file and then put the PROVINCE and POPULATION values into a HashMap (cana) via a key/value pair. I've created a HashSet (canada) to split up the .csv, and I would like to keep that as-is if possible.
My question is about the cana.add(provSet, pop1). I am getting an "cannot find symbol - method add(java.util.Set) error around the "put", and I can't figure out why. Can someone please help me understand what I've done wrong? Since I am a beginner, additional explanation would be greatly appreciated!
String filename = "canada.csv";
try
{
BufferedReader br = new BufferedReader(new FileReader("canada.csv"));
String line = null;
HashSet<String> canada = new HashSet<String>();
HashMap<Set<String>, Set<Integer>> cana = new HashMap<Set<String>, Set<Integer>>();
while((line=br.readLine())!=null) {
String city = line.split(",")[0];
canada.add(city);
String province = line.split(",")[1];
canada.add(province);
Set<String> provSet = new HashSet<String>(Arrays.asList(province));
String population = line.split(",")[2];
canada.add(population);
int p = new Integer(population);
Set<Integer> pop1 = new HashSet<Integer>(Arrays.asList(p));
cana.add(provSet, pop1); //ERROR
//Trying to find the most populated province
String maxProvince = "";
int maxProvPop = 0;
for(String province : cana.keySet()) {
int provPop = cana.get(province);
System.out.println(population);
if( provPop > maxProvPop )
{
maxProvPop = provPop;
maxProvince = province;
}
System.out.println("The most populated province is " + maxProvince + " with a population of " + maxProvPop);
}

I think you're mixing up the methods for HashSet and HashMap. You use the add method for HashSet, and put method for HashMap.
HashSet Documentation
HashMap Documentation

Adding variable to String URL

I modified my code like follows according to what i understood from a stack overflow question i found
private static final String url = "http://****/get_items.php?keyword=%1$s";
String searchKey = getIntent().getStringExtra("2");
Final_url = String.format(url, searchKey);
when i print the Final_url like this
Toast.makeText(getApplicationContext(),"url = "+ Final_url, Toast.LENGTH_SHORT).show();
the printed value is always
url = http://*****/get_items.php?keyword=null
Is There Something I'm Missing ?

try with:
"http://****/get_items.php?keyword=%s";

Randomizing in Java

I have 4 Strings to represent people and 4 Strings to represent names.
I'm trying to randomize them so that every time I start my application, my four people will have different names, but no one can have the same name during runtime.
Example:
String person_one;
String person_two;
String person_three;
String person_four;
String name_one = "Bob";
String name_two = "Jane";
String name_three = "Tim";
String name_four = "Sara";
Hope this makes some sense.

You can use Collections.shuffle():
List<String> names = new ArrayList<String>();
names.add("Bob");
names.add("Jane");
names.add("Tim");
names.add("Sara");
Collections.shuffle(names);
person_one = names.get(0);
person_two = names.get(1);
person_three = names.get(2);
person_four = names.get(3);

You can use Collections.shuffle().