Develop Reference

Android: String array

I have a game activity about different alphabet are randomly available user would select some of them that are making a correct word.
i made the string array of word which is answer
but i want to knew how to display this answer word alphabets and adding some randomly other alphabet as a confusion?
like taking the answer for example [World] and divid it's alphabet like that [W , L, D , O] AND make them randomly displayed and the player choose from them ?
TextView guessItTimer;
CountDownTimer timer;
Random r;
String currentWord;
private int presCounter = 0;
private int maxPresCounter = 4;
private String[] keys = {"R", "I", "B", "D", "X"};
String dictionary[] = {
"remember",
"hungry",
"crying",
"sour",
"sleep",
"awesome",
"Seven",
"color",
"began",
"appear",
"weight",
"language"
};
TextView textScreen, textQuestion, textTitle;
Animation smallbigforth;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_guess_it);
guessItTimer = findViewById(R.id.guessItTimer);
smallbigforth = AnimationUtils.loadAnimation(this, R.anim.smallbigforth);
keys = shuffleArray(keys);
for (String key : keys) {
addView(( findViewById(R.id.layoutParent)), key, findViewById(R.id.et_guess));
}
maxPresCounter = 4;
resetTimer();
}
//CountdownTimer
void resetTimer() {
timer = new CountDownTimer(30150, 1000) {
#Override
public void onTick(long l) {
guessItTimer.setText(String.valueOf(l / 1000));
}
#Override
public void onFinish() {
Toast.makeText(GuessItActivity.this, "Time is over", Toast.LENGTH_SHORT).show();
startActivity(new Intent(GuessItActivity.this, BossFinalActivity.class));
finish();
}
}.start();
}
private String[] shuffleArray(String[] ar) {
Random rnd = new Random();
for (int i = ar.length - 1; i > 0; i--) {
int index = rnd.nextInt(i + 1);
String a = ar[index];
ar[index] = ar[i];
ar[i] = a;
}
return ar;
}
private void addView(LinearLayout viewParent, final String text, final EditText editText) {
LinearLayout.LayoutParams linearLayoutParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT
);
linearLayoutParams.rightMargin = 30;
final TextView textView = new TextView(this);
textView.setLayoutParams(linearLayoutParams);
textView.setBackground(this.getResources().getDrawable(R.drawable.bgpink));
textView.setTextColor(this.getResources().getColor(R.color.colorPurple));
textView.setGravity(Gravity.CENTER);
textView.setText(text);
textView.setClickable(true);
textView.setFocusable(true);
textView.setTextSize(32);
textQuestion = findViewById(R.id.textQuestionBoss);
textScreen = findViewById(R.id.gametitle);
textTitle = findViewById(R.id.Ammo);
textView.setOnClickListener(new View.OnClickListener() {
#SuppressLint("SetTextI18n")
#Override
public void onClick(View v) {
if(presCounter < maxPresCounter) {
if (presCounter == 0)
editText.setText("");
editText.setText(editText.getText().toString() + text);
textView.startAnimation(smallbigforth);
textView.animate().alpha(0).setDuration(300);
presCounter++;
if (presCounter == maxPresCounter)
doValidate();
}
}
});
viewParent.addView(textView);
}
private void doValidate() {
presCounter = 0;
EditText editText = findViewById(R.id.et_guess);
LinearLayout linearLayout = findViewById(R.id.layoutParent);
currentWord = dictionary[r.nextInt(dictionary.length)];
if(editText.getText().toString().equals(currentWord)) {
//Toast.makeText(GuessItActivity.this, "Correct", Toast.LENGTH_SHORT).show();
Intent a = new Intent(GuessItActivity.this,BossFinalActivity.class);
startActivity(a);
editText.setText("");
} else {
Toast.makeText(GuessItActivity.this, "Wrong", Toast.LENGTH_SHORT).show();
editText.setText("");
}
keys = shuffleArray(keys);
linearLayout.removeAllViews();
for (String key : keys) {
addView(linearLayout, key, editText);
}
}
public void onBackPressed() {
timer.cancel();
this.finish();
super.onBackPressed();
}

You can achieve it like this
String a2z = "abcdefghijklmnopqrstuvwxyz";
String answer = "World";
// lets assume you need 16 char to select from
ArrayList<Character> chars = new ArrayList<Character>();
for (int i = 0; i < answer.length(); i++) {
chars.add(answer.charAt(i));
}
int dif = 16 - chars.size();
Random rand = new Random();
for (int i = 0; i < dif; i++) {
int ranIndex = rand.nextInt(a2z.length());
chars.add(a2z.charAt(ranIndex));
}
Collections.sort(chars);
System.out.println("nameArray2" + chars.toString());

Buttons text to string

I have an array of buttons which contains two elements.
I'd like to create a string from the text of the buttons.
The thing i am struggling with is the if statement. Basically, it is never firing the toast. Why?
String word2 = "ok";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button buttons[] = new Button[2];
buttons[0] = (Button) findViewById(R.id.btn);
buttons[1] = (Button) findViewById(R.id.btn2);
buttons[0].setText("o");
buttons[1].setText("k");
buttons[0].setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
String word = "";
for (int i = 0; i < 2; i++) {
word += buttons[i].getText().toString();
}
if (word == word2) {
Toast.makeText(getApplicationContext(), "Good",
Toast.LENGTH_LONG).show();
}
}
});
}

Change this:
if (word == word2) {
with this:
if(word.equals(word2)) {
You can't compare String with ==

Write Better Questions (basically questions)
Compare string with .equals() not ==.
Just use if(word.equals(word2) {
Why? The first one is content comparision, but the second one i just
a reference comparision so:
String a = new String("x");
String b = new String("x");
if(a==b){
System.out.println("It wont work");
}else if(a.equals(b)){
System.out.println("It will");
}
Dont ever use new String(), it was just for proof
I must write it.
Change line
for (int i = 0; i < 2; i++) {
into
for (int i = 0; i < buttons.length; i++) {
So your application will be easier to change

Dynamically checking CheckBoxes in Android

I have 3 row in table, where every row has 3 checkbox. I want to check appropriate CheckBox according to its id.
I have to check following ids CheckBox.
tempArray =[1-2-3,3-2,null];
i am already splitting these data and putting in string array(setopts).more see my code.
Null for no check any CheckBox with this row.
I am doing this code in my project.
Vector<CheckBox> chkBoxList = new Vector<CheckBox>();
Vector<TextView> txtViewList = new Vector<TextView>();
// mat_elemItemSetChk.get(0).size() OF VALUE IS 3
for (int n = 0; n < mat_elemItemSetChk.get(0).size(); n++) {
LinearLayout llayout = new LinearLayout(getContext());
ll.setOrientation(android.widget.LinearLayout.VERTICAL);
cb = new CheckBox(getContext());
tv = new TextView(getContext());
for (int r = 0; r < tempArray.size() ; r++) {
isContains=tempArray.get(r).contains(individualValueSeparator);
if(isContains){
setOpts = tempArray.get(r).split("\\-");
for (int k = 0; k < setOpts.length; k++)
{
ItemValue iv = (ItemValue) mat_elemItemSetChk.get(0).get(n);
if (((int) iv.getId()) == Integer.parseInt(setOpts[k]))
{
mat_elemItemSetChk.get(n).get(Integer.parseInt(setOpts[k])-1);
cb.setChecked(true);
}
}
}else{
if(tempArray.get(r).toString().equalsIgnoreCase("null")||tempArray.get(r).toString()!=null){
String temp;
String px[]= null;
temp = tempArray.get(r).toString();
ItemValue iv = (ItemValue) mat_elemItemSetChk.get(0).get(n);
if (((int) IV.getId()) == Integer.parseInt(temp))
{
mat_elemItemSetChk.get(0).get(Integer.parseInt(temp) - 1);
cb.setChecked(true);
}
}else{
cb.setChecked(false);
}
}
}
tv.setText(mat_elemItemSetChk.get(0).get(n) .toString());
llayout.addView(cb);
llayout.addView(tv);
chkBoxList.add(cb);
txtViewList.add(tv);
ll.addView(llayout);
// this.addView(tableLayout);
}
Thank you in advance.

make an array selchkboxlist and store the selected checkbox id in it and check condition like selchkboxlist.isEmpty() if true then then show error msg other wise go ahed...
selchkboxlist=new ArrayList<String>();
cbs = new CheckBox[8];
// generate dynamic item check box code
for(int k = 0; k<8; k++)
{
cbs[k] = new CheckBox(getApplicationContext());
#SuppressWarnings("deprecation")
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
rl.addView(cbs[k], params);
int j =k+1;
cbs[k].setText("ITEM" + j);
cbs[k].setTextColor(Color.parseColor("#000000"));
cbs[k].setId(k+1);
cbs[k].setPadding(70, 20, 10, 10);
// check box on click listener for add in to produduct array with quntity
cbs[k].setOnClickListener( new View.OnClickListener()
{
public void onClick(View v)
{
String chk = null;
if (((CheckBox) v).isChecked()) {
chk = Integer.toString(v.getId());
selchkboxlist.add(chk);
} else {
selchkboxlist.remove(chk);
}
}
});
}
// button on click listener code
b.setOnClickListener(new OnClickListener() {
#SuppressLint("SdCardPath")
public void onClick(View v) {
if (! selchkboxlist.isEmpty()) {
shoe erroe msg here
}else{
go ahed
}
}
});

java.lang.NumberFormatException: unable to parse '' as integer

i want to set the calculation result in TextView named total[] from the value of EditText named point[] .but i am able to parse the value and put it in the TextView . it give me an error in logcat
06-27 02:27:01.467: E/AndroidRuntime(275): Caused by: java.lang.NumberFormatException: unable to parse '' as integer
this is an error in logcat. i want to add integer values to the textview continuously from the edittext on the same layout
public class player_name extends Activity {
LinearLayout player_name;
TableLayout ply_name;
Bundle b,b1;
List<TextView> allEds = new ArrayList<TextView>();
List<Button> allplus = new ArrayList<Button>();
List<Button> allminus = new ArrayList<Button>();
List<EditText> alledit = new ArrayList<EditText>();
List<TextView> alltotal = new ArrayList<TextView>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.player_name);
b1 = getIntent().getExtras();
String[] result = b1.getStringArray("playerName");
player_name = (LinearLayout) findViewById(R.id.player_name);
ply_name = new TableLayout(this);
player_name.addView(ply_name);
TableLayout.LayoutParams tableRowParams=new TableLayout.LayoutParams
(TableLayout.LayoutParams.MATCH_PARENT,TableLayout.LayoutParams.MATCH_PARENT,1.0f);
TextView[] ed1 = new TextView[result.length+1];
Button[] plus = new Button[result.length+1];
Button[] minus = new Button[result.length+1];
EditText[] point = new EditText[result.length+1];
TextView[] total = new TextView[result.length+1];
TableRow[] TR= new TableRow[result.length+1];
int[] totalscore = null;
String[] temp = null;
Button btnResult = new Button(player_name.this);
btnResult.setText(" click here to get RESULT");
for(int i=0;i<=(result.length-1);i++) {
ed1[i] = new TextView(player_name.this);
plus[i] = new Button(player_name.this);
minus[i] = new Button(player_name.this);
point[i] = new EditText(player_name.this);
total[i] = new TextView(player_name.this);
TR[i] = new TableRow(player_name.this);
allEds.add(ed1[i]);
alltotal.add(total[i]);
alledit.add(point[i]);
allplus.add(plus[i]);
allminus.add(minus[i]);
TR[i].addView(ed1[i]);
TR[i].addView(point[i]);
TR[i].addView(plus[i]);
TR[i].addView(minus[i]);
TR[i].addView(total[i]);
ply_name.addView(TR[i]);
TR[i].setLayoutParams(tableRowParams);
totalscore[i] =Integer.parseInt(point[i].getText().toString());
temp[i] = "" + totalscore[i];
ed1[i].setId(i);
ed1[i].setHeight(50);
ed1[i].setWidth(70);
ed1[i].setText(result[i]);
ed1[i].setTextColor(Color.CYAN);
total[i].setId(i);
total[i].setHeight(50);
total[i].setWidth(70);
total[i].setText(""+0);
total[i].setTextColor(Color.CYAN);
point[i].setId(i);
point[i].setHeight(50);
point[i].setWidth(120);
point[i].setHint(result[i]+"\'s");
point[i].setInputType(InputType.TYPE_CLASS_NUMBER);
point[i].setTextColor(Color.BLACK);
plus[i].setId(i);
plus[i].setHeight(50);
plus[i].setWidth(50);
plus[i].setText("+");
plus[i].setTextColor(Color.BLACK);
minus[i].setId(i);
minus[i].setHeight(50);
minus[i].setWidth(50);
minus[i].setText("-");
minus[i].setTextColor(Color.BLACK);
plus[i].setOnClickListener(new OnClickListener() {
public void onClick(View v) {
}
});
minus[i].setOnClickListener(new OnClickListener() {
public void onClick(View v) {
}
});
}
LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
player_name.addView(btnResult, lp);
btnResult.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent intent1 = new Intent(player_name.this,result.class);
startActivity(intent1);
}
});
}
}

You need to check whether the string you are parsing is an integer. Try this code:
if (IsInteger(point[i].getText().toString()))
totalscore[i] =Integer.parseInt(point[i].getText().toString());
and add this function:
public static boolean IsInteger(String s)
{
if (s == null || s.length() == 0) return false;
for(int i = 0; i < s.length(); i++)
{
if (Character.digit(s.charAt(i), 10) < 0)
return false;
}
return true;
}
I hope this helps

How to jumble a word from EditText and apply the jumbled word into a TextView

I need to know how to jumble a word entered into EditText.
The jumbled word will show in another TextView in the same interface.
I have tried to do this but I get a force close error. This is what I have tried within the button:
wordE = (EditText)findViewById(R.id.entry);
jumble = (TextView) findViewById(R.id.jumble);
Button link5Btn = (Button)findViewById( R.id.selected );
link5Btn.setOnClickListener( new View.OnClickListener()
{
public void onClick(View v)
{
jumbleMe(al);
}
Which calls the method:
private void jumbleMe( String word ){
al = wordE.getText().toString();
ArrayList<Character> al = new ArrayList<Character>();
for (int i = 0; i < wordE.length(); i++) {
al.add(word.charAt(i));
}
Collections.shuffle(al);
jumble.setText( al.toString() );
}
I would appreciate any help on this. Thanks

You made some mistakes.
Try changing the code to:
link5Btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
jumbleMe(wordE.getText().toString());
}
});
and
private void jumbleMe(String word) {
ArrayList<Character> al = new ArrayList<Character>();
for (int i = 0; i < wordE.length(); i++) {
al.add(word.charAt(i));
}
Collections.shuffle(al);
String result = "";
for (Character character : al) {
result += character;
}
jumble.setText(result);
}