Develop Reference

Getting an attribute from an object inside an arraymap

I'm creating a class called "partite", and this is the code
public class Partita {
String HT; //HomeTeam
String AT; //AwayTeam
String dataP; //dataPartita
int HG; //HomeGoal
int AG; //AwayGoal
String FTR; //Full time result
public Partita(){
this.HT = "";
this.AT = "";
this.dataP = "";
this.HG = 0;
this.AG = 0;
this.FTR = "";
}
public Partita(String HT, String AT, String dataP, int HG, int AG, String FTR) {
this.HT = HT;
this.AT = AT;
this.dataP = dataP;
this.HG = HG;
this.AG = AG;
this.FTR = FTR;
}
}
In the main activity I'm creating an ArrayList, putting a list of some "Partita" object, with attributes come from a json file, and then I create an ArrayMap and put the ArrayList inside, like this
for (int i = 0; i < arr.length(); i++) {
JSONObject jsonPart = arr.getJSONObject(i);
partite.add(new Partita(jsonPart.getString("HomeTeam"),
jsonPart.getString("AwayTeam"),jsonPart.getString("Date"),
jsonPart.getInt("FTHG"), jsonPart.getInt("FTAG"),
jsonPart.getString("FTR")));
partitemap.put(i, partite.get(i));
Log.i("partita", partite.get(i).HT + " " + partite.get(i).HG + ":" + partite.get(i).AG + " " + partite.get(i).AT);
}
How can I use the ArrayMap instead of ArrayList to get the attributes of an object and use it?

Use this instead (edited):
for (int i = 0; i < arr.length(); i++) {
JSONObject jsonPart = arr.getJSONObject(i);
partitemap.put(i, new Partita(jsonPart.getString("HomeTeam"),
jsonPart.getString("AwayTeam"),
jsonPart.getString("Date"),
jsonPart.getInt("FTHG"),
jsonPart.getInt("FTAG"),
jsonPart.getString("FTR")
)
);
Log.d("tag", partitemap.get(i).HT);
}

Assign Integer Value to String

I am developing an app in which i have to assign integer values to different string of words. For Example I want to assign:
John = 2
Good = 3
Person= 7
Now these John, Good and person are strings while 2,3 and 7 are int values. But I am so confused about how to implement that. I read many things about how to convert int to string and string to int but this is different case.
I am giving option to user to enter a text in editText and if for example User enters "Hello John you are a good person" then this line output will be 12 as all the three words John, Good and person are there in the input text. Can you tell me how to achieve that?
I am stuck here is my little code:
String s = "John";
int s_value= 2;
now I want to assign this 2 to John so that whenever user give input and it contains John then the value 2 is shown for John. Please Help as I am just a beginner level programmer
Here is my code (Edited)
String input = "John good person Man";
Map<String, Integer> map = new HashMap<>();
map.put("John", 2);
map.put("Good", 3);
map.put("Person", 7);
//int number = map.get("Good");
String[] words = input.split(" ");
ArrayList<String> wordsList = new ArrayList<String>();
for(String word : words)
{
wordsList.add(word);
}
for (int ii = 0; ii < wordsList.size(); ii++) {
// get the item as string
for (int j = 0; j < stopwords.length; j++) {
if (wordsList.contains(stopwords[j])) {
wordsList.remove(stopwords[j]);//remove it
}
}
}
for (String str : wordsList) {
Log.e("msg", str + " ");
}
As u see i applied code of you and then i want to split my main string so that each word of that string compares with the strings that are in the Map<>. Now i am confused what to write in the for loop ( 'stopwords' will be replaced by what thing?)

You can use a Map<String, Integer> to map words to numbers:
Map<String, Integer> map = new HashMap<>();
map.put("John", 2);
map.put("Good", 3);
map.put("Person", 7);
and then query the number given a word:
int number = map.get("John"); // will return 2
UPDATE
The following code iterates over a collection of words and adds up the values that the words match to:
List<String> words = getWords();
int total = 0;
for (String word : words) {
Integer value = map.get(word);
if (value != null) {
total += value;
}
}
return total;

I would use a Dictionary for this. You can add a string and an int (or anything else actually) value for that string.
Dictionary<string, int> d = new Dictionary<string, int>();
d.Add("John", 2);
d.Add("Good", 3);
d.Add("Person", 7);

You can use String contains to achieve this. Following is the code:
String input = "John you are a good person";
String s1 = "John";
String s2 = "good";
String s3 = "person";
int totScore =0;
if(input.contains(s1)) {
totScore=totScore+2;
}
else if (input.contains(s2)) {
totScore=totScore+3;
}
else if (input.contains(s3)) {
totScore=totScore+7;
}
System.out.print(totScore);

You can use class like.
class Word{
String wordName;
int value;
public Word(String wordName, int value){
this.wordName = wordName;
this.value = value;
}
// getter
public String getWordName(){
return this.wordName;
}
public int getValue(){
return this.value;
}
// setter
public void setWordName(String wordName){
this.wordName = wordName;
}
public void zetValue(int value){
this.value = value;
}
}
You can create an object of the word
Word person = new Word("Person",3);

receive a string message from user input in android and parse to an int so can be stored in an array and compared with another array of integers

I am having a problem with the above task in my android application. I am accepting user input from the EditText widget in the form of String. I accepting numbers from the user so I have to parse them to integers so they can be compared with another array of integers. I have the line:
String message = editText.getText().toString()
then to try and parse the String to an int I have the code line:
int userNumbers = Integer.parseInt(message).
However when I attempt to compare the array userArray with the array numbers I am getting the error that "Incompatible operand types String and Integer.
Can anyone see where my problem is or how I can solve it? Here's my code:
Thanks in advance.
public class MainActivity extends Activity {
public final static String EXTRA_MESSAGE = ".com.example.lotterychecker.MESSAGE";
static boolean bonus = false;
static boolean jackpot = false;
static int lottCount = 0;
Button check;
Integer [] numbers;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//link to the intended web site and get the lottery numbers while the app is opening
try {
Document doc = Jsoup.connect("http://www.national-lottery.co.uk/player/p/drawHistory.do").userAgent("Mozilla").get();
Elements elements = doc.getElementsByClass("drawhistory");
Element table = elements.first();
Element tbody = table.getElementsByTag("tbody").first();
Element firstLottoRow = tbody.getElementsByClass("lottorow").first();
Element dateElement = firstLottoRow.child(0);
System.out.println(dateElement.text());
Element gameElement = firstLottoRow.child(1);
System.out.println(gameElement.text());
Element noElement = firstLottoRow.child(2);
System.out.println(noElement.text());
String [] split = noElement.text().split(" - ");
// set up an array to store numbers from the latest draw on the lottery web page
Integer [] numbers = new Integer [split.length];
int i = 0;
for (String strNo : split) {
numbers [i] = Integer.valueOf(strNo);
i++;
}
for (Integer no : numbers) {
System.out.println(no);
}
Element bonusElement = firstLottoRow.child(3);
Integer bonusBall = Integer.valueOf(bonusElement.text());
System.out.println("Bonus ball: " + bonusBall);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
//called when the user clicks the send button
public void checkNumbers(View view) {
final int SIZE =6;
String [] userArray = new String[SIZE];
//create an intent to display the numbers
Intent intent = new Intent(this, DisplayNumbersActivity.class);
EditText editText = (EditText) findViewById(R.id.enter_numbers);
String message = editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message );
startActivity(intent);
//parse string message to an int for user numbers
try{
int userNumbers = Integer.parseInt(message); //is this right?
}//try
catch (NumberFormatException e)
{
System.out.println("Not a number" + e.getMessage());
}
Toast.makeText(MainActivity.this, "Here are your numbers", Toast.LENGTH_LONG).show();
for (int count =0; count < SIZE; count ++)
{
if (check.isPressed())
{
userArray[count] = editText.getText().toString();
}
}//for
//compare the two arrays of integers
for (int loop = 0; loop < userArray.length; loop++)
{
for (int loopOther = 0; loopOther < numbers.length; loopOther++)
{
if (userArray[loop] == numbers[loopOther]) //how do I parse this?
{
lottCount++;
}else if (userArray[loop] == bonus)
{
bonus = true;
}
}//for
}//for main

You have this
Integer [] numbers; // numbers is an integer array
You have string array
String [] userArray = new String[SIZE]; // userArray is a string array
You compare like below
if (userArray[loop] == numbers[loopOther])
So you get the error Incompatible operand types String and Integer.
try
if (Integer.parseInt(userArray[loop]) == numbers[loopOther])
Enclosing the above with try catch block
String message = editText.getText().toString();
try{
int userNumbers = Integer.parseInt(message);
//is this right? yes
}
catch (NumberFormatException e)
{
e.printStacktrace();
}

Change String to Int here:
for (int loop = 0; loop < userArray.length; loop++)
{
for (int loopOther = 0; loopOther < numbers.length; loopOther++)
{
if (Integer.valueOf(userArray[loop]) == numbers[loopOther]) //how do I parse this?
{
lottCount++;
}else if (Integer.valueOf(userArray[loop]) == bonus)
{
bonus = true;
}
}//for
}//for main

Parse Like this :
for (int loop = 0; loop < userArray.length; loop++)
{
for (int loopOther = 0; loopOther < numbers.length; loopOther++)
{
if (Integer.parseInt(userArray[loop]) == numbers[loopOther])
{
lottCount++;
}else if (userArray[loop] == bonus)
{
bonus = true;
}
}
}

Weird Android program error

This code is giving an error saying "error receiving broadcast intent in activity"
I cant find any eroors though...........any ideas ?
i've added the loop condition as seven as i only want the first seven scan results
class WifiReceiver extends BroadcastReceiver {
public void onReceive(Context con, Intent intent) {
sb = new StringBuilder();
wifiList = mainWifi.getScanResults();
for(int i = 0; i < wifiList.size(); i++)
{
sb.append((wifiList.get(i)).SSID.toString());
sb.append(' ');
sb.append('!');
sb.append("\n\n");
}
String net = sb.toString();
if(wifiList.size() > 0)
{
char excl = '!';
int excl1 = excl;
String[] aray = null;
for(int j = 0; j<7; j++)
{
int index = net.indexOf(excl1);
String a = net.substring(0, index);
aray[j] = a;
String temp = net.substring(index+1);
net = temp;
}
String one = aray[0];
String two = aray[1];
String three = aray[2];
String four = aray[3];
String five = aray[4];
String six = aray[5];
String seven = aray[7];
tv1.setText(one);
}
else
{
tv1.setText("No Networks Detected");
}
}
}
PS : I've only added into one TextView as this is a test module

The "aray" array is not being intialized correctly. You need to initialize "aray" before accessing it:
String[] aray = new String[7];
You are also going outside the dimensions of the array. this:
String seven = aray[7];
should be:
String seven = aray[6];
An even better solution would be to use an ArrayList.
ArrayList al = new ArrayList();
al.add(yourString);

Multi-dimensional array to JSON java / android gson

In my web service I'm making a query to a database, and I would like to return 2 columns of the database and put these columns in a 2d array.
Also I would like to convert the array to JSON and send it to the client. The client using gson parses the message from the server in a 2d array. Is it possible?
I have tried a lot but no luck till now. Thank you in advance.
The last version i've tried is this:
private static String[][] db_load_mes (String u){
ArrayList<String> array1 = new ArrayList<String>();
ArrayList<String> array2 = new ArrayList<String>();
JSONObject messages = new JSONObject();
Connection c = null;
try{
// Load the driver
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
c = DriverManager.getConnection("jdbc:odbc:dsn1","mymsg","mymsg");
Statement s = c.createStatement();
// SQL code:
ResultSet r;
r = s.executeQuery("select * from accounts ");
int i = 0, j = 0;
int k = 0;
String x,y;
while(r.next()) {
x = r.getString("username");
array1.add(x);
y = r.getString("password");
array2.add(y);
k = k + 1;
}
int count = array1.size();
String[][] row = new String[count][2];
Iterator<String> iter = array1.iterator();
while (iter.hasNext()) {
row[i][0]=iter.next();
i++;
}
Iterator<String> iter2 = array2.iterator();
while (iter2.hasNext()) {
row[j][1]=iter2.next();
j++;
}
for(int z=0;z<count;z++)
System.out.println(row[z][0] + "\t" + row[z][1] + "\n");
if (k == 0)
System.err.println("no accounts!");
c.close();
s.close();
}
catch(SQLException se)
{
System.err.println(se);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
return ...;
}
With the above code I can create the 2d array but how can I send this array to the client.

Here is how I made it using Gson from google...
Download gson from here
include it in your project.
package javaapplication1;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
public class JavaApplication1 {
public static void main(String[] args) {
int rows = 3;
String records[][] = new String[][]{{"bob", "123-pass"},
{"erika", "abc123"},
{"richard", "123123123"}
};
Gson gson = new Gson();
String recordsSerialized = gson.toJson(records);
System.out.println(recordsSerialized);
/* prints this
[["bob","123-pass"],["erika","abc123"],["richard","123123123"]]
*/
// if you want a better output import com.google.gson.GsonBuilder;
Gson gsonPretty = new GsonBuilder().setPrettyPrinting().create();
String recordsSerializedPretty = gsonPretty.toJson(records);
System.out.println(recordsSerializedPretty);
/* PRINTS IN different lines.. I can't paste it here */
// for retrieval
String retrievedArray[][] = gsonPretty.fromJson(recordsSerializedPretty, String[][].class);
for (int i = 0; i < retrievedArray.length; i++) {
for (int j = 0; j < retrievedArray[0].length; j++) {
System.out.print(retrievedArray[i][j]+" ");
}
System.out.println("");
}
// PRINTS THIS
/*
bob 123-pass
erika abc123
richard 123123123
*/
}
}