Develop Reference

How to change Random in to Sequence Order

I am developing word scramble android app. I want to display the String of word in Sequence order but in below code it get random word from the dictionary. My question is how to change my code to get words from Dictionary in Sequence Order?
String[] dictionary=
{"One","Server","Terminate","Analyze","Finish","Start","Wonder","Slow"};
r = new Random(System.currentTimeMillis());
newGame();
// shuffle algorithm
private String shuffleWord(String word){
List<String> letters = Arrays.asList(word.split(""));
Collections.shuffle(letters);
String Shuffled="";
for (String letter : letters ){
Shuffled += letter;
}
return Shuffled;
}
private void newGame(){
// get random word from dictionary
currentWord= dictionary[r.nextInt(dictionary.length)];
// show the shuffled word
tv_word.setText(shuffleWord(currentWord));
// clear the textfield
et_guess.setText("");
// switch buttons
b_new.setEnabled(false);
b_check.setEnabled(true);
}
}

Actually you pick your word with a random position
r = new Random(System.currentTimeMillis());
using an integer random from 0 to ArrayOfWords lenght.
currentWord= dictionary[r.nextInt(dictionary.length)];
Why you dont try to make a counter instead?
int r = 0;
while (r<dictionary.length()) {
currentWord = dictionary[r];
r++;
}
Or I don't understand your answer. But there is the pseudo of what I understand.

After spliting String into ArryList<String> i cannot read the text from any cell

I am an android noobie. What I am trying to do is to make this String an ArrayList. This is done. When i Print it On (with tv.setText) , the result is what i need but in this if i have right below i cannot find the "1".
The result i want to have is to store the text between the noumbers inside another ArrayList but to go there i have to be able to read the strings from the ArrayList.
public class MainActivity extends AppCompatActivity {
String text = "1Hello12People22Paul22Jackie21Anna12Fofo2";
TextView tv;
List<String> chars = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView)findViewById(R.id.tv);
PrinThemNow();
}
public void PrinThemNow(){
chars = Arrays.asList(text.split(""));
tv.setText(toString().valueOf(chars));
for(int i=0;i<chars.size();i++){
if(toString().valueOf(chars.get(i)) == " 1"){
Toast.makeText(this,"I found One",Toast.LENGTH_LONG).show();
//This if is not working while the TV's text shows " 1"
}
}
}
}

First, just a tip, from string to char[] you can use
char[] chars = myString.toCharArray();
because it has no sense to save a char array as a string ArrayList
but now the problem. you have your string and you wanna print the text between the numbers.
It's not really clear what is your goal but lets try.
I will suppose you used the char[] because it's 10 times better and easier
case 1) you wanna print text betweens "1"s
//lets loop the chars
bool firstOneFound = false;
int firstOccurrence = -1;
int secondOccurrence = -1;
int i = 0;
for(char c : chars){
//is it equals to 1?
if(c.equals('1')){
//check if we are already after the first 1
if(firstOneFound){
//if yes, we found the final one
secondOccurrence = i;
break;
}
else{
//this is the first occurrence
firstOccurrence = i;
firstOneFound = true;
}
}
i++;
}
if(firstOccurrence != -1 && secondOccurrence != -1){
String myFinalString = myString.subString(firstOccurrence, secondOccurrence);
}
case 2) you wanna print all text except numbers (maybe with a space instead)
for(char c : chars){
//check if it's a number
if(c >= '0' && c <= '9'){
//replace the number with anything else
c = ' '; //if you wanna have it as a space
}
}
//print the final string
String myFinalString = new String(chars);
NOTE:
You can also use ArrayList of string, just replace ' with "
hope it helps

How to save number from user input?

Recently I've started to mess around with Android Studio and decided to make an app. I've made the most of my app, but I encounter a little problem. I need to memorize in a variable a number from user input, but I don't know how to that, I've tried solutions found on the internet, even here but I get an error.
Can somebody help me with some ideas or the code edited which I must put in my app ?
This is the java code for the activity:
public class calc_medie_teza extends ActionBarActivity implements View.OnClickListener {
EditText adaug_nota;
static final int READ_BLOCK_SIZE = 100;
TextView afisare;
TextView afisare2;
Button calc;
EditText note_nr;
EditText nota_teza;
int suma;
double medie;
double medieteza;
int nr_note = 0;
int notamedie;
int notateza;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_calc_medie_teza);
afisare = (TextView) findViewById(R.id.afisare);
afisare2 = (TextView) findViewById(R.id.afisare2);
calc = (Button) findViewById(R.id.calc);
calc.setOnClickListener(this);
note_nr = (EditText) findViewById(R.id.note_nr);
nota_teza = (EditText) findViewById(R.id.nota_teza);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_calc_medie_teza, menu); // creare meniu
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId(); // meniu
return id == R.id.action_settings || super.onOptionsItemSelected(item);
}
public void onClick(View v) // afisare medie
{
calcul_medie();
}
public void buton_adauga(View v)
{
if(note_nr == )
suma = suma + notamedie;
nr_note = nr_note + 1;
}
public double calcul_medie() // calculul mediei
{
medie = suma / nr_note;
medieteza = ((medie * 3)+ notateza)/4;
return medieteza;
}
Here is a photo with the activity: http://onlypro.ro/img/images/ootllv2f55hnwdgi0xlv.png
Basically the app needs to add the input number to variable when I press the "Adauga nota" [Add grade] button and then I have to insert the "teza" number and when press the "Calculeaza media" [Calculate] the app will then calculate the calcul_medie() and return a decimal number. Between "Introduceti notele aici" [Add grades here] and "Adaugata nota"[Add grade] I have a Number enter text, the same is between "Introduceti teza aici" [Add thesis bere] and "Calculeaza media" [Calculate]. I don't know how to store the number the user puts in and sum it in "notamedie" variable.
I hope you understand my problem.
For any questions you'll have I'll respond as soon as I can.
Thanks in advance !

Well, I think your probably asked how to get the input of the String from the UI and translate them into Integer/BigDecimal. If so, here is some solution:
first, you get get the string from the UI:
String input = note_nr.getText().toString().trim();
change the string input to integer/BigDecimal:
int number1 = Integer.parseInt(input);
BigDecimal number2 = new BigDecimal(input);
Correct me if misunderstood your questions. Thanks.

I did not understand the problem at all. Please clearly define the problem and use english if you can. As fas the I understood there will be a Edittext to which the user will input the value. Gets its value in the activity and then use it.
EditText edittext;
editext = (EditText) findViewById(R.id.editext);
String value = edit text.getText().toString(); // the value that the user inputted in String data format
// Here for addition you will need the value in int or decimal for that
int valueInt = Integer.parse(value); // this will be the value in int type
double valueInt = = Double.parseDouble(value); // this will be the value (user inputted) in double data type ( which you will need if you want to use decimal numbers).

When you press a button just retrieve the appropriate value from the edittext in the following way
edittext = (EditText)layout.findViewById(R.id.txtDescription);
String string = edittext.getText().toString();

to retrieve the text do this
String string = note_nr.getText().toString();
// Converting String to int
int myValue =Integer.parseInt(string);

I tried that one more time, but the IDE says that the variable I used for "string" is never used, but I've used it.
number1= (EditText) findViewById(R.id.number1);
String number_1 = number1.getText().toString();
number2= (EditText) findViewById(R.id.number2);
String number_2= number2.getText().toString();

R3muSGFX, can you post the whole codes?
String number_1 = number1.getText().toString(); this line codes just mean that you initialized a String variable "number_1".
and you will used it when app perform a math function, like you wrote in the beginning:
public double calcul_medie()
{
medie = suma / nr_note;
medieteza = ((medie * 3)+ notateza)/4;
return medieteza;
}
but if you did not use "number_1" at all, IDE will imply you the warning message
:the variable I used for "string" is never used

Check if number exists, if it does - get another

I am using a database to show random message at the push of a button.
Every time the button is pushed, a random number is generated and displays a message that corresponds to that number.
Of course, the same message can appear twice as the same number can be generated twice.
So I am creating a string, and I am concatenating each number when the button is pushed.
If the new random number is in the String, then I want to get another number. If that number is in that String, I want to get another number etc etc (Regression?).
I also want to have a global count that I can change, so if the String reaches a size of 9 numbers, it will be reset to "".
String randomList; //global
final int MAX_STRING_LENGTH = 9;
Integer randomNumber = getRandomMessage(messages.size());
if(randomList.length() > 0)
{
if(!randoms.contains(randomNumber.toString()))
{
messageText.setText(messages.get(randomNumber));
}
}

Create a boolean Array of 9 elements
boolean[] check = new boolean[9];
Everytime you use a number, set check[number] to true
void useNumber(int number){
check[number] = true;
}
To check if you already used this number
boolean checkNumber(int number){
return check[number];
}
To reset check
void resetCheck(){
for(int i = 0; i < check.length; i++) check[i] = false;
}
Edit:
Get a string for a given number, resetCheck if necessary;
String getString(int number){
if(usedString == check.length){
resetCheck();
usedString = 0;
}
if(checkNumber(number)){
return getString(getRandomNumber());
}else{
usedString++;
return strings[number];
}
}

I think you can better use a boolean array. You can store the boolean array with the SharedPreferences class. A boolean array is more flexible and you can retrieve the values in constant time. You can also easily make it larger when you have more random messages.

Do a simple trick Hope this works for you
buttonRandom.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
Collections.shuffle(messages);
messageText.setText(messages.get(0));
}
});

Android - Check content of a String

I have a string (length 3-8) assigned to a variable (text). I want to check whether the 2nd and 3rd characters are NOT numeric (a letter or symbol or space..or anything other than numbers).

Elementary way to do this could be:
if(((text.charAt(1)-'0')>=0)&&(text.charAt(1)-'0')<10))||((text.charAt(2)-'0')>=0)&&(text.charAt(2)-'0')<10)))
{
//do nothing, since this means 2nd and/or 3rd characters in the string are numeric
}
else
{
// Your condition is met
}
You could also use REGEX's , if your checking is still more complicated.

Here is Another way to achieve this:
boolean isNumeric = true;
String test = "testing";
char second = test.charAt(1);
char third = test.charAt(2);
try {
Integer.parseInt(String.valueOf(second));
Integer.parseInt(String.valueOf(third));
} catch(NumberFormatException e) {
isNumeric = false;
}
System.out.println("Contains Number in 2nd and 3rd or both position: " + isNumeric);

You might make use of the String.IndexOf(String) method, like:
String digits = "0123456789";
String s2 = text.substring(2,3);
String s3 = text.substring(3,4);
boolean valid = (digits.indexOf(s2) > -1) && (digits.indexOf(s3) > -1);