Android Open Source - Music-Theory Quiz Activity

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Back to project page Music-Theory.

License

The source code is released under:

GNU General Public License

Java Source Code

package com.mt;
/*from   ww w.  j av  a  2  s . com*/
import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;

import com.mt.theory.Score;

public abstract class QuizActivity extends Activity implements OnClickListener {

  private ImageView correctImage;
  private Score currentQuestion;
  private ImageView incorrectImage;
  private MediaPlayer mp;
  private CountDownTimer nextQuestionViewTimer = new CountDownTimer(1000, 500) {

    @Override
    public void onFinish() {
      displayQuestion();
    }

    @Override
    public void onTick(long millisUntilFinished) {
    }
  };

  /**
   * Implementing classs should use this method to do any necessary view
   * manipulation for displaying the question
   */
  public abstract void displayQuestion();

  public void displayResult(ImageView result) {
    FrameLayout frame = (FrameLayout) findViewById(R.id.question_frame);
    frame.removeAllViews();
    frame.addView(result);
  }

  /**
   * This method is used to determine if the resource selected by the user was
   * in fact the correct answer to the question.
   * 
   * @param clickedResourceId
   *            The resource selected by the player as their answer to the
   *            current question
   * @return True only if the provided resource id matches the resource
   *         associated with the correct answer.
   */
  public abstract boolean evaluateAnswer(int clickedResourceId);

  /**
   * Generates whatever musical notation is necessary to represent this
   * question. E.g. Note quiz randomly selects a Clef, Octave and Tone to be
   * displayed to a user on the staff.
   * 
   * @return A Score object representing the musical notation to be displayed
   *         for this question.
   */
  public abstract Score generateQuestion();

  /**
   * Returns the current question displayed to the user
   * 
   * @return
   */
  public Score getCurrentQuestion() {
    return currentQuestion;
  }

  /**
   * The media player associated with this quiz. Implementing classes should
   * reset and reuse this rather than creating multiple instances.
   * 
   * @return
   */
  public MediaPlayer getMediaPlayer() {
    return mp;
  }

  @Override
  public void onClick(View v) {
    if (evaluateAnswer(v.getId())) {
      onCorrectAnswer();
    } else {
      onIncorrectAnswer();
    }

    nextQuestionViewTimer.start();
  }

  /**
   * Called after a user has selected the correct answer, and before the next
   * question has been generated.
   */
  public void onCorrectAnswer() {
    currentQuestion = generateQuestion();
    displayResult(correctImage);
  }

  /**
   * Called after the user has selected an incorrect answer, and before the
   * question is redisplayed
   */
  public void onIncorrectAnswer() {
    displayResult(incorrectImage);
  }

  public boolean questionReady() {
    return currentQuestion != null;
  }

  public void setCurrentQuestion(Score currentQuestion) {
    this.currentQuestion = currentQuestion;
  }

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    requestWindowFeature(Window.FEATURE_NO_TITLE);

    mp = new MediaPlayer();
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
  }

  @Override
  protected void onRestoreInstanceState(Bundle savedInstanceState) {
    currentQuestion = savedInstanceState.getParcelable("score");
    super.onRestoreInstanceState(savedInstanceState);
  }

  @Override
  protected void onResume() {
    super.onResume();

    if (correctImage == null) {
      correctImage = new ImageView(getApplicationContext());
      correctImage.setScaleType(ScaleType.CENTER);
      correctImage.setImageResource(R.drawable.correct);

      incorrectImage = new ImageView(getApplicationContext());
      incorrectImage.setScaleType(ScaleType.CENTER);
      incorrectImage.setImageResource(R.drawable.incorrect);
    }

    if (!questionReady()) {
      currentQuestion = generateQuestion();
    }

    displayQuestion();
  }

  @Override
  protected void onSaveInstanceState(Bundle outState) {
    outState.putParcelable("score", currentQuestion);
    super.onSaveInstanceState(outState);
  }
}

Java Source Code List

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