Android Open Source - dv-quiz Quiz Activity

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From Project

Back to project page dv-quiz.

License

The source code is released under:

Apache License

Java Source Code

package com.dvorakdev.dvquiz;
/*from www. j  a  va  2s.  c  om*/
import java.util.ArrayList;
import java.util.List;

import com.dvorakdev.dvquiz.context.dvQuizContext;
import com.dvorakdev.dvquiz.model.Answer;
import com.dvorakdev.dvquiz.model.Question;
import com.dvorakdev.dvquiz.model.Quiz;
import com.dvorakdev.lib.dvObjectRadioButton;

import android.annotation.TargetApi;
import android.app.Activity;
import android.os.Bundle;
import android.util.SparseArray;
import android.util.TypedValue;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.RadioGroup;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import android.os.Build;

public class QuizActivity extends Activity {
  
  private Quiz selectedQuiz;
  private SparseArray<Answer> selectedAnswers = new SparseArray<Answer>();
  
  private Spinner questionSpinner;
  
  private TextView quizQuestionTextView;
  private RadioGroup quizQuestionAnswerRadioGroup;  
  private Button previousButton;
  private Button nextButton;
  
  private Question currentQuestion;
  private Integer currentQuestionPosition = 0;
  
  private Boolean isQuizStarted = false;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_quiz);
    // Show the Up button in the action bar.
    setupActionBar();    
    
    if (!this.isQuizStarted)
    {
      this.isQuizStarted = true;
      
      this.selectedQuiz = (Quiz) dvQuizContext.getInstance().getValue("selectedQuiz");
      
      for (Question aQuestion : this.selectedQuiz.getShuffledQuestions())
      {
        this.selectedAnswers.put(aQuestion.hashCode(), null);
      }      
      
      this.quizQuestionTextView = (TextView) this.findViewById(R.id.quizQuestionTextView);
      this.questionSpinner = (Spinner) this.findViewById(R.id.quizQuestionSpinner);
      this.quizQuestionAnswerRadioGroup = (RadioGroup) this.findViewById(R.id.quizQuestionAnswerRadioGroup);
      this.previousButton = (Button) this.findViewById(R.id.quizActionPreviousQuestion);
      this.nextButton = (Button) this.findViewById(R.id.quizActionNextQuestion);
      
      List<String> questionList = new ArrayList<String>();
      
      for (int i = 1; i <= this.selectedQuiz.getQuestions().size(); i++)
      {
        questionList.add(String.format("Question %d", i));
      }      
          
          ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
          R.layout.question_spinner_item, questionList);
          
          adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
          
          this.questionSpinner.setAdapter(adapter);
          
          this.questionSpinner.setOnItemSelectedListener(new OnItemSelectedListener()
          {

        @Override
        public void onItemSelected(AdapterView<?> arg0, View arg1,
            int arg2, long arg3) {          
          QuizActivity.this.currentQuestionPosition = arg2;
          QuizActivity.this.loadQuestion();
        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {          
        }
          });
    }
  }
  
  private void loadQuestion()
  {
    this.currentQuestion = this.selectedQuiz.getQuestions().get(this.currentQuestionPosition);
    
    this.quizQuestionTextView.setText(String.format(this.currentQuestion.getQuestion(), "ISO-8859-15"));    
    
    this.quizQuestionAnswerRadioGroup.removeAllViews();    
    
    for (Answer anAnswer : this.currentQuestion.getShuffledAnswers())
    {
      final dvObjectRadioButton<Answer> anAnswerRadioButton = new dvObjectRadioButton<Answer>(this);
      
      anAnswerRadioButton.setObject(anAnswer);
      anAnswerRadioButton.setId(anAnswer.hashCode());
      anAnswerRadioButton.setTextSize(TypedValue.COMPLEX_UNIT_PX, this.getResources().getDimensionPixelSize(R.dimen.question_answer));      
      
      if (!(this.selectedAnswers.get(this.currentQuestion.hashCode()) == null) && anAnswer.equals(this.selectedAnswers.get(this.currentQuestion.hashCode())))
      {
        this.quizQuestionAnswerRadioGroup.check(anAnswerRadioButton.getId());
        
        anAnswerRadioButton.setChecked(true);
      }
      
      anAnswerRadioButton.setOnClickListener(new OnClickListener()
      {

        @Override
        public void onClick(View arg0) {
          QuizActivity.this.selectedAnswers.put(QuizActivity.this.currentQuestion.hashCode(), anAnswerRadioButton.getObject());
        }
        
      });
      
      this.quizQuestionAnswerRadioGroup.addView(anAnswerRadioButton);
    }
    
    if (this.currentQuestion.isFirst())
    {
      this.previousButton.setEnabled(false);
    }
    
    if (this.currentQuestion.isLast())
    {
      this.nextButton.setEnabled(false);
    }
    
    if (this.currentQuestion.hasPrevious())
    {
      this.previousButton.setEnabled(true);
    }
    
    if (this.currentQuestion.hasNext())
    {
      this.nextButton.setEnabled(true);
    }
    
    this.questionSpinner.setSelection(this.currentQuestionPosition);
  }

  /**
   * Set up the {@link android.app.ActionBar}, if the API is available.
   */
  @TargetApi(Build.VERSION_CODES.HONEYCOMB)
  private void setupActionBar() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
      getActionBar().setDisplayHomeAsUpEnabled(true);
    }
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.quiz, menu);
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_submit_answers) {
      
      dvQuizContext.getInstance().setValue("selectedAnswers", this.selectedAnswers);
      
      return true;
    }
    return super.onOptionsItemSelected(item);
  }
  
  public void previousQuestion(View view)
  {
    if (this.currentQuestion.hasPrevious())
    {
      this.currentQuestionPosition--;
    }
    
    this.loadQuestion();
  }
  
  public void nextQuestion(View view)
  {
    if (this.currentQuestion.hasNext())
    {
      this.currentQuestionPosition++;
    }
    
    this.loadQuestion();
    
  }
  
  public void checkAnswer(View view)
  {
    // TODO i18n
    if (this.selectedAnswers.get(this.currentQuestion.hashCode()) == null)
    {
      Toast.makeText(this, "You must select an Answer first", Toast.LENGTH_SHORT).show();
      
      return;
    }

    if (this.selectedAnswers.get(this.currentQuestion.hashCode()).isCorrect())
    {
      Toast.makeText(this, "Correct!", Toast.LENGTH_SHORT).show();
    }
    else
    {
      Toast.makeText(this, "Wrong answer!", Toast.LENGTH_SHORT).show();
    }
  }

}

Java Source Code List

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