Android Open Source - SimpleAndroidTest Test Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Copyright 2012 Alberto Salmern Moreno
 * // w  ww  . j  a v a  2 s  .c o m
 * This file is part of SimpleAndroidTest - https://github.com/berti/SimpleAndroidTest
 * 
 * SimpleAndroidTest is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * SimpleAndroidTest is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with SimpleAndroidTest.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.primoberti.simpleandroidtest;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import java.util.Random;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;

/**
 * Activity for performing a test. The questions file is parsed to load all the
 * available questions. Each question is shown with the corresponding options.
 * After selecting an option, the next question is shown. If there are no more
 * questions, the results activity is launched.
 * 
 * @author berti
 */
public class TestActivity extends Activity {

  /* Private fields ************************** */

  private List<Question> questions;

  private Question question;

  private int currentQuestion = -1;

  private int totalQuestions;

  private int score = 0;

  private int correctAnswers = 0;

  private Random random = new Random();

  /* Public static fields ******************** */

  public final static String EXTRA_TOTAL_QUESTIONS = "EXTRA_NUM_QUESTIONS";
  public final static String EXTRA_CORRECT_ANSWERS = "EXTRA_CORRECT_ANSWERS";
  public final static String EXTRA_SCORE = "EXTRA_SCORE";

  /* Private static fields ******************* */

  // TODO use preferences or other sort of configuration
  private final static boolean SELECT_RANDOM = true;
  private final static int MAX_QUESTIONS = 2;

  /* Activity methods ************************ */

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.test);

    try {
      InputStream inputStream = getAssets().open("questions.txt");
      questions = parseQuestions(inputStream);

      if (MAX_QUESTIONS > 0) {
        totalQuestions = Math.min(questions.size(), MAX_QUESTIONS);
      }
      else {
        totalQuestions = questions.size();
      }

      ProgressBar progressBar = (ProgressBar) findViewById(R.id.testProgressBar);
      progressBar.setMax(totalQuestions);
    }
    catch (IOException e) {
      Log.e("EnglishTest", e.getMessage(), e);
    }

    nextQuestion();
  }

  /* Private methods ************************* */

  private List<Question> parseQuestions(InputStream inputStream)
      throws IOException {
    List<Question> questions = new LinkedList<Question>();
    BufferedReader reader = new BufferedReader(new InputStreamReader(
        inputStream));

    String line = reader.readLine();
    while (line != null) {
      Question question = Question.parseQuestion(line);
      if (question != null) {
        questions.add(question);
      }
      line = reader.readLine();
    }

    return questions;
  }

  private void nextQuestion() {
    currentQuestion++;
    if (currentQuestion < totalQuestions) {
      if (SELECT_RANDOM) {
        question = questions.remove(random.nextInt(questions.size()));
      }
      else {
        question = questions.get(currentQuestion);
      }
      showQuestion(question);

      TextView progressLabel = (TextView) findViewById(R.id.testProgressLabel);
      progressLabel.setText(String.format(
          getResources().getString(R.string.test_progress),
          currentQuestion + 1, totalQuestions));

      ProgressBar progressBar = (ProgressBar) findViewById(R.id.testProgressBar);
      progressBar.setProgress(currentQuestion + 1);
    }
    else {
      showResults();
    }
  }

  private void showResults() {
    Intent intent = new Intent(this, ResultsActivity.class);
    intent.putExtra(EXTRA_TOTAL_QUESTIONS, totalQuestions);
    intent.putExtra(EXTRA_CORRECT_ANSWERS, correctAnswers);
    intent.putExtra(EXTRA_SCORE, score);
    startActivity(intent);

    finish();
  }

  private void showQuestion(Question question) {
    TextView phrase = (TextView) findViewById(R.id.phrase);
    phrase.setText(question.getPhrase());

    OnClickListener listener = new OptionButtonOnClickListener();
    String[] options = randomizeOptions(question.getOptions());

    setButton(R.id.buttonOptionA, options[0], listener);
    setButton(R.id.buttonOptionB, options[1], listener);
    setButton(R.id.buttonOptionC, options[2], listener);
    setButton(R.id.buttonOptionD, options[3], listener);
  }

  private void setButton(int id, String text, OnClickListener listener) {
    Button button = (Button) findViewById(id);
    button.setText(text);
    button.setOnClickListener(listener);
  }

  private String[] randomizeOptions(String[] options) {
    List<String> remaining = new LinkedList<String>(Arrays.asList(options));
    List<String> randomized = new LinkedList<String>();
    Random random = new Random();

    while (remaining.size() > 1) {
      int pos = random.nextInt(remaining.size());
      randomized.add(remaining.remove(pos));
    }
    randomized.add(remaining.get(0));

    return randomized.toArray(new String[options.length]);
  }

  /* Private inner classes ******************* */

  private class OptionButtonOnClickListener implements OnClickListener {

    @Override
    public void onClick(View v) {
      if (question.isCorrect(((Button) v).getText())) {
        score++;
        correctAnswers++;
      }
      nextQuestion();
    }

  }

}

Java Source Code List

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