Android Quiz Game - Countdown timer for each qstion
I think the activity doesn't exist anymore at a certain point when you try to make the dialog(probably when the CountDownTimer
is near the end?!?).
Anyway I think finishing and starting the same activity for each question isn't such a good idea, instead you could use the current activity and simply restart the timer. For example:
public class QuestionActivity extends SherlockActivity implements
OnClickListener {
private CountDownTimer mCountDown;
@Override
public void onCreate(Bundle savedInstanceState) {
// ...
mCountDown = new CountDownTimer(20000, 1000) {
@Override
public void onFinish() {
// myCounter.setText("Time up!");
timeUp(context);
}
@Override
public void onTick(long millisUntilFinished) {
myCounter.setText("Time left: "
+ String.valueOf(millisUntilFinished / 1000));
}
}.start();
// ...
and in the onClick
callback do the same to setup a new question, stop the old timer and restart the new timer:
//check if end of game
if (currentGame.isGameOver()) {
Intent i = new Intent(this, EndgameActivity.class);
startActivity(i);
finish();
} else {
if (mCountDown != null) {
mCountDown.cancel();
}
currentQ = currentGame.getNextQuestion();
setQuestions();
mCountDown = new CountDownTimer(20000, 1000) {
@Override
public void onFinish() {
// myCounter.setText("Time up!");
timeUp(context);
}
@Override
public void onTick(long millisUntilFinished) {
myCounter.setText("Time left: "
+ String.valueOf(millisUntilFinished / 1000));
}
}.start();
}
Also, in the callback for the Dialog
's Button
I would first close the Dialog
before finishing the Activity
:
((AlertDialog) dialog).dismiss();
QuestionActivity.this.finish();
Comments
-
tiptopjat almost 2 years
I have created a Quiz app for Android using the tutorial here: http://automateddeveloper.blogspot.co.uk/2011/06/getting-started-complete-android-app.html
For each question, the user will only have 20 seconds to answer it. If he/she fails to answer in 20 seconds, an
AlertDialog
will popup and the game will terminate.To do this, I have added a counter in the
OnCreate
method ofQuestionActivity class
:final TextView myCounter = (TextView) findViewById(R.id.countdown); new CountDownTimer(20000, 1000) { @Override public void onFinish() { timeUp(); } @Override public void onTick(long millisUntilFinished) { myCounter.setText("Time left: " + String.valueOf(millisUntilFinished / 1000)); } }.start(); public void timeUp() { AlertDialog.Builder builder = new AlertDialog.Builder( QuestionActivity.this); builder.setTitle("Times up!") .setMessage("Game over") .setCancelable(false) .setNeutralButton(android.R.string.ok, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { QuestionActivity.this.finish(); } }); AlertDialog alert = builder.create(); alert.show(); }
The counter works displays and functions on screen correctly. After answering a question, the activity moves to the next question and the counter resets itself to 20 seconds again.
The problem
The quiz has 15 questions, after answering 3 or 4 questions, the app crashes and I get the following error:
07-18 00:49:05.530: E/AndroidRuntime(4867): android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@41533a80 is not valid; is your activity running?
I believe this relates to the
AlertDialog
. I have looked up this error code on Stackoverflow and the popular solution is to passActivityName.this
as the context when building theAlertDialog
.Unfortunately this does not solve the problem.
I believe the counter is setting a time limit of 20 seconds for the whole activity. My requirement is 20 seconds for each question.
However, the counter resets to 20 seconds when the user press the'
Next
button and the activity moves to the next question.Should I be resetting the counter when the user presses the
Next
button? Here is theOnClickListener
code for theNext
buttonif (currentGame.isGameOver()) { Intent i = new Intent(this, EndgameActivity.class); startActivity(i); finish(); } else { Intent i = new Intent(this, QuestionActivity.class); startActivity(i); SHOULD I ADD SOMETHING HERE? finish();
Can anyone help me code a solution to my problem?
Here is all the code in
QuestionActivity.class
public class QuestionActivity extends SherlockActivity implements OnClickListener { private Question currentQ; private GamePlay currentGame; private Context context; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.question); getSupportActionBar().hide(); /** * Configure current game and get question */ currentGame = ((ChuckApplication) getApplication()).getCurrentGame(); currentQ = currentGame.getNextQuestion(); Button nextBtn = (Button) findViewById(R.id.nextBtn); nextBtn.setOnClickListener(this); Button quitBtn = (Button) findViewById(R.id.quitBtn); quitBtn.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { finish(); } }); //Update the question and answer options.. setQuestions(); final TextView myCounter = (TextView) findViewById(R.id.countdown); new CountDownTimer(20000, 1000) { @Override public void onFinish() { // myCounter.setText("Time up!"); timeUp(context); } @Override public void onTick(long millisUntilFinished) { myCounter.setText("Time left: " + String.valueOf(millisUntilFinished / 1000)); } }.start(); } public void timeUp(Context context) { AlertDialog.Builder builder = new AlertDialog.Builder( QuestionActivity.this); builder.setTitle("Times up!") .setMessage("Game over") .setCancelable(false) .setNeutralButton(android.R.string.ok, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { QuestionActivity.this.finish(); } }); AlertDialog alert = builder.create(); alert.show(); } /** * Method to set the text for the question and answers from the current * games current question */ private void setQuestions() { // set the question text from current question String question = Utility.capitalise(currentQ.getQuestion()) + "?"; TextView qText = (TextView) findViewById(R.id.question); qText.setText(question); // set the available options List<String> answers = currentQ.getQuestionOptions(); TextView option1 = (TextView) findViewById(R.id.answer1); option1.setText(Utility.capitalise(answers.get(0))); TextView option2 = (TextView) findViewById(R.id.answer2); option2.setText(Utility.capitalise(answers.get(1))); TextView option3 = (TextView) findViewById(R.id.answer3); option3.setText(Utility.capitalise(answers.get(2))); TextView option4 = (TextView) findViewById(R.id.answer4); option4.setText(Utility.capitalise(answers.get(3))); } public void onClick(View arg0) { //validate a checkbox has been selected if (!checkAnswer()) return; //check if end of game if (currentGame.isGameOver()) { Intent i = new Intent(this, EndgameActivity.class); startActivity(i); finish(); } else { Intent i = new Intent(this, QuestionActivity.class); startActivity(i); finish(); } } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { switch (keyCode) { case KeyEvent.KEYCODE_BACK: return true; } return super.onKeyDown(keyCode, event); } /** * Check if a checkbox has been selected, and if it has then check if its * correct and update gamescore */ private boolean checkAnswer() { String answer = getSelectedAnswer(); if (answer == null) { // Log.d("Questions", "No Checkbox selection made - returning"); return false; } else { // Log.d("Questions", // "Valid Checkbox selection made - check if correct"); if (currentQ.getAnswer().equalsIgnoreCase(answer)) { // Log.d("Questions", "Correct Answer!"); currentGame.incrementRightAnswers(); } else { // Log.d("Questions", "Incorrect Answer!"); currentGame.incrementWrongAnswers(); } return true; } } private String getSelectedAnswer() { RadioButton c1 = (RadioButton) findViewById(R.id.answer1); RadioButton c2 = (RadioButton) findViewById(R.id.answer2); RadioButton c3 = (RadioButton) findViewById(R.id.answer3); RadioButton c4 = (RadioButton) findViewById(R.id.answer4); if (c1.isChecked()) { return c1.getText().toString(); } if (c2.isChecked()) { return c2.getText().toString(); } if (c3.isChecked()) { return c3.getText().toString(); } if (c4.isChecked()) { return c4.getText().toString(); } return null; }
-
tiptopjat almost 12 yearsThanks dude. I will give this a try when I get home tonight.
-
tiptopjat almost 12 yearsI've added all your code and the counter problem has been fixed. However, when the quiz is over and I start EndgameActivity.class, after 20 seconds I get a WindowManager$BadTokenException error. It looks like the timer is still running and trying to display the AlertDialog. I am using finish() after starting the EndgameActivity activity. Any ideas what I am doing wrong?
-
user almost 12 years@tiptopjat Add the same code to stop the timer for the case when the game is over:
if (currentGame.isGameOver()) { if (mCountDown != null) { mCountDown.cancel(); } ...
and see if it solves the issue. -
tiptopjat almost 12 yearsProblem solved! Thanks. I have only have one issue now. In my original solution, the radio buttons for each question would all be unchecked when moving to a new question. After implementing your solution, the radio button selected from the previous question is still selected in the next question...
-
tiptopjat almost 12 yearsFixed it by adding
radioGroup.clearCheck()
at the start ofsetQuestions()
method.