Develop Reference

How to solve this scenario on Android Studio?

Click on red button 2 times and green button 3 times after this click on yellow button 5 times. If this done successfully you go on next screen for next quiz.

Assuming your buttons already connected to corresponding functions in Android Manifest
private int redClicks = 0;
private int greenClicks = 0;
private int yellowClicks = 0;
public void redClickCount(View view) {
if (redClicks < 2){
redClicks++;
}
greenClicks = 0;
yellowClicks = 0;
}
public void greenClickCount(View view) {
if (redClicks == 2 && greenClicks < 3){
greenClicks++;
} else { //start all over again
redClicks = 0;
greenClicks = 0;
yellowClicks = 0;
}
}
public void yellowClickCount(View view) {
if (redClicks == 2 && greenClicks == 3 && yellowClicks <5){
yellowClicks++;
} else {
if (redClicks == 2 && greenClicks == 3 && yellowClicks = 5){
// go to next round
} else {
//start all over again
redClicks = 0;
greenClicks = 0;
yellowClicks = 0;
}
}
}

LUHN credit-card validation fails on a valid card number

In my application i want to check whether the user have entered valid card number for that i have used LUHN algorithm.I have created it as method and called in the mainactivity. But even if i give valid card number it shows invalid.While entering card number i have given spaces in between i didn't know because of that its not validating properly. Please help me in finding the mistake.
CreditcardValidation.java
public class CreditcardValidation {
String creditcard_validation,msg;
//String mobilepattern;
public static boolean isValid(long number) {
int total = sumOfDoubleEvenPlace(number) + sumOfOddPlace(number);
if ((total % 10 == 0) && (prefixMatched(number, 1) == true) && (getSize(number)>=16 ) && (getSize(number)<=19 )) {
return true;
} else {
return false;
}
}
public static int getDigit(int number) {
if (number <= 9) {
return number;
} else {
int firstDigit = number % 10;
int secondDigit = (int) (number / 10);
return firstDigit + secondDigit;
}
}
public static int sumOfOddPlace(long number) {
int result = 0;
while (number > 0) {
result += (int) (number % 10);
number = number / 100;
}
return result;
}
public static int sumOfDoubleEvenPlace(long number) {
int result = 0;
long temp = 0;
while (number > 0) {
temp = number % 100;
result += getDigit((int) (temp / 10) * 2);
number = number / 100;
}
return result;
}
public static boolean prefixMatched(long number, int d) {
if ((getPrefix(number, d) == 5)
|| (getPrefix(number, d) == 4)
|| (getPrefix(number, d) == 3)) {
if (getPrefix(number, d) == 4) {
System.out.println("\nVisa Card ");
} else if (getPrefix(number, d) == 5) {
System.out.println("\nMaster Card ");
} else if (getPrefix(number, d) == 3) {
System.out.println("\nAmerican Express Card ");
}
return true;
} else {
return false;
}
}
public static int getSize(long d) {
int count = 0;
while (d > 0) {
d = d / 10;
count++;
}
return count;
}
public static long getPrefix(long number, int k) {
if (getSize(number) < k) {
return number;
} else {
int size = (int) getSize(number);
for (int i = 0; i < (size - k); i++) {
number = number / 10;
}
return number;
}
}
public String creditcardvalidation(String creditcard)
{
Scanner sc = new Scanner(System.in);
this.creditcard_validation= creditcard;
long input = 0;
input = sc.nextLong();
//long input = sc.nextLong();
if (isValid(input) == true) {
Log.d("Please fill all the column","valid");
msg="Valid card number";
}
else{
Log.d("Please fill all the column","invalid");
msg="Please enter the valid card number";
}
return msg;
}
}
MainActivity.java
addcard.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View v) {
if(v.getId()==R.id.btn_add)
{
creditcard= card_number.getText().toString();
cv = new CreditcardValidation();
String mob = cv.creditcardvalidation(creditcard);
Toast.makeText(getActivity(), mob, 1000).show();``

refer code below
EditText cardNumber=(EditText)findViewById(R.id.cardNumber);
String CreditCardType = "Unknown";
/// Remove all spaces and dashes from the passed string
String CardNo ="9292304336";///////cardNumber.getText().toString();
CardNo = CardNo.replace(" ", "");//removing empty space
CardNo = CardNo.replace("-", "");//removing '-'
twoDigit=Integer.parseInt(CardNo.substring(0, 2));
System.out.println("----------twoDigit--"+twoDigit);
fourDigit=Integer.parseInt(CardNo.substring(0, 4));
System.out.println("----------fourDigit--"+fourDigit);
oneDigit=Integer.parseInt(Character.toString(CardNo.charAt(0)));
System.out.println("----------oneDigit--"+oneDigit);
boolean cardValidation=false;
// 'Check that the minimum length of the string isn't <14 characters and -is- numeric
if(CardNo.length()>=14)
{
cardValidation=cardValidationMethod(CardNo);
}
boolean cardValidationMethod(String CardNo)
{
//'Check the first two digits first,for AmericanExpress
if(CardNo.length()==15 && (twoDigit==34 || twoDigit==37))
return true;
else
//'Check the first two digits first,for MasterCard
if(CardNo.length()==16 && twoDigit>=51 && twoDigit<=55)
return true;
else
//'None of the above - so check the 'first four digits collectively
if(CardNo.length()==16 && fourDigit==6011)//for DiscoverCard
return true;
else
if(CardNo.length()==16 || CardNo.length()==13 && oneDigit==4)//for VISA
return true;
else
return false;
}
also u can refer this demo project

Scanner.nextLong() will stop reading as spaces (or other non-digit characters) are encountered.
For instance, if the input is 1234 567 .. then nextLong() will only read 1234.
However, while spaces in the credit-card will [likely] cause it to fail LUHN validation with the above code, I make no guarantee that removing the spaces would make it pass - I'd use a more robust (and well-tested) implementation from the start. There is no need to rewrite such code.

Get Resource Id from ImageView

I am trying to develop a little game.
I have a ViewFlipper which has 50 pictures (random frequence of 4 pictures) in ImageViews. Then I have 4 Buttons with the same 4 pictures which can appear in the ViewFlipper.
The task is to click the right button when the right picture appears.
(When Picture 1 appears Button 1 has to be pressed and so on)
My Problem is I don't know how to get the displayed ImageView id.
flipper.getCurrentView().getId()
gives me "-1" as Id. But I want to have the Id of "R.drawable.pic1"
My code so far:
my Loader-Method:
protected void loadPicturesIntoFlipper() {
Random generator = new Random();
pictures = new ArrayList();
for(int i = 0; i < 50;i++){
int number = generator.nextInt(4) + 1;
if(number == 1){
pic = R.drawable.pic1;
}
if(number == 2){
pic = R.drawable.pic2;
}
if(number == 3){
pic = R.drawable.pic3;
}
if(number == 4){
pic = R.drawable.pic4;
}
pictures.add(pic);
}
for(int i=0;i<pictures.size();i++)
{
setFlipperImage((Integer) pictures.get(i));
}
}
My Insert-Method:
private void setFlipperImage(int res) {
image = new ImageView(getApplicationContext());
image.setBackgroundResource(res);
flipper.addView(image);
}
My Check-Method :
protected void check(int number, int id) {
int code = 0;;
if(number == 1){
code = R.drawable.button_tip_finder;
}
if(number == 2){
code = R.drawable.button_about_us;
}
if(number == 3){
code = R.drawable.button_power_calculator;
}
if(number == 4){
code = R.drawable.button_powerpedia;
}
if(code == id){
test.setText(""+id);
}
else{
test.setText(""+id);
}
}
I call it like:
button1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
check(1,flipper.getCurrentView().getId());
flipper.showNext();
}
});

Do it like this:
private void setFlipperImage(int res) {
image = new ImageView(getContext());
image.setBackgroundResource(res);
image.setTag(res); //<------
flipper.addView(image);
}
and then:
button1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
check(1,(Integer)flipper.getCurrentView().getTag());//<----
flipper.showNext();
}
});
BTW use else in all of your code please, E.g:
if(number == 1){
pic = R.drawable.pic1;
} else if(number == 2){
pic = R.drawable.pic2;
} else if(number == 3){
pic = R.drawable.pic3;
}

may this one helps you,
int icon = getResources().getIdentifier([YOUR IMAGE NAME], "drawable",
getPackageName());

Radio button is not displaying right value

In my coding m having three buttons. i am getting the selected button is id and used it for comparison. But it first automatically displays the default selected button's id before clicking the button.
rdgp.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group, int checkedId) {
counter++;
if (counter > 5 || counter >= anarray.size()) {
Toast.makeText(testActivity.this, "" + score, 2000).show();
Intent intent = new Intent(testActivity.this, Badge.class);
intent.putExtra("Score", score);
startActivity(intent);
return;
}
rb1.setText(anarray.get(counter));
rb2.setText(an1array.get(counter));
rb3.setText(an2array.get(counter));
rb4.setText(an3array.get(counter));
rb5.setText(an4array.get(counter));
int ans = 0;
if (checkedId == R.id.radio0) {
ans = 1;
} else if (checkedId == R.id.radio1) {
ans = 2;
} else if (checkedId == R.id.radio2) {
ans = 3;
} else if (checkedId == R.id.radio3) {
ans = 4;
}
Toast.makeText(testActivity.this, "" + ans, 2000).show();
if (ans == anarray.get(counter))
;
{
score = score + 1;
}
}
});

to get the id of checked radiobutton use group.getCheckedRadioButtonId().Returns the identifier of the selected radio button in this group. Upon empty selection, the returned value is -1.

Add the following line, in your XML for all radio buttons.
android:checked="false"

If you are getting default value from radio buttons then check in our layout file weather you used android:checked = "true".If this is the state then change it to false.

How to I finish the "continue;" That i putted after the if statement?

I made a statement and if it is true it continues, I want to stop this "continue" and make another statement for example touchdown and touchup.
here is my code
private void updateRunning(float deltaTime) {
List<TouchEvent> touchEvents = game.getInput().getTouchEvents();
int len = touchEvents.size();
for (int i = 0; i < len; i++) {
TouchEvent event = touchEvents.get(i);
if (event.type != TouchEvent.TOUCH_UP)
continue;
world.doodle.DOODLE_Y = 3;
touchPoint.set(event.x, event.y);
guiCam.touchToWorld(touchPoint);
if (OverlapTester.pointInRectangle(pauseBounds, touchPoint)) {
Assets.clicks();
state = GAME_PAUSED;
return;
}
}
world.update(deltaTime, game.getInput().getAccelX());
if (world.score != lastScore) {
lastScore = world.score;
scoreString = "" + lastScore;
}
if (world.state == World.WORLD_STATE_NEXT_LEVEL) {
state = GAME_LEVEL_END;
}
if (world.state == World.WORLD_STATE_GAME_OVER) {
state = GAME_OVER;
if (lastScore >= Settings.highscores[4])
scoreString = "new highscore: " + lastScore;
else
scoreString = "score: " + lastScore;
Settings.addScore(lastScore);
Settings.save(game.getFileIO());
}
}

Little confused by what you are asking, but perhaps an else if?
if (event.type == TouchEvent.TOUCH_UP) {
/* do something for TOUCH_UP event */
} else if (event.type == TouchEvent.TOUCH_DOWN) {
/* do something for TOUCH_DOWN event */
} else {
/* do something else */
}
You can't stop a continue after you execute it.

Try adding break; where you want it to stop.