Android Open Source - Music-Theory Note 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.notes;
/*  w w w.ja  v  a 2s . com*/
import java.io.FileInputStream;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import android.content.SharedPreferences;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.widget.Button;
import android.widget.FrameLayout;

import com.mt.QuizActivity;
import com.mt.R;
import com.mt.audio.MidiTrack;
import com.mt.staff.ScoreView;
import com.mt.theory.Clef;
import com.mt.theory.Note;
import com.mt.theory.NoteGroup;
import com.mt.theory.Score;
import com.mt.theory.Tone;
import com.mt.utils.NoteUtil;
import com.mt.utils.QuizUtil;

public class NoteQuizActivity extends QuizActivity {

  private static final String PREFERENCE_KEY_PREFIX = "note";

  private SharedPreferences prefs;
  private Map<Tone, Integer> noteButtonMap;
  private boolean soundEnabled;
  private int soundDuration;
  private int soundInstrument;

  @Override
  public void displayQuestion() {
    ScoreView staff = new ScoreView(this, getCurrentQuestion());
    FrameLayout frame = (FrameLayout) findViewById(R.id.question_frame);
    frame.removeAllViews();
    frame.addView(staff);
  }

  @Override
  public boolean evaluateAnswer(int clickedResourceId) {
    Note note = getCurrentQuestion().getNoteGroups().get(0).getNotes().get(0);
    return noteButtonMap.get(note.getTone()).intValue() == clickedResourceId;
  }

  @Override
  public Score generateQuestion() {
    Clef clef = QuizUtil.getRandomClefFromPreferences(prefs, PREFERENCE_KEY_PREFIX);

    Note note = QuizUtil.getRandomNoteFromPreferenceRange(clef, prefs, PREFERENCE_KEY_PREFIX);

    NoteGroup group = new NoteGroup(note);
    return new Score(clef, Collections.singletonList(group), null, null);
  }

  @Override
  public void onCorrectAnswer() {
    if (soundEnabled) {
      generateNotesound();
      playNotesound();
    }
    super.onCorrectAnswer();
  }

  private void generateNotesound() {
    try {
      MidiTrack midi = new MidiTrack();
      midi.setBPM(80);
      midi.progChange(soundInstrument);
      Note note = getCurrentQuestion().getNoteGroups().get(0).getNotes().get(0);
      int position = NoteUtil.getMidiPositionValue(note.getOctave(), note.getTone());
      midi.addNote(soundDuration, position, 127);
      midi.writeToFile("note.mid", getCacheDir());
    } catch (Exception e) {

    }
  }

  private void playNotesound() {
    try {
      MediaPlayer mp = getMediaPlayer();
      if (mp.isPlaying() || mp.isLooping()) {
        mp.stop();
      }
      mp.reset();
      FileInputStream fis = new FileInputStream(getCacheDir() + "/note.mid");
      mp.setDataSource(fis.getFD());
      mp.prepare();
      mp.start();
      fis.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  private void setupListeners() {
    noteButtonMap = new HashMap<Tone, Integer>();

    Button button = (Button) findViewById(R.id.answer_a);
    noteButtonMap.put(Tone.A, R.id.answer_a);
    button.setOnClickListener(this);

    button = (Button) findViewById(R.id.answer_b);
    noteButtonMap.put(Tone.B, R.id.answer_b);
    button.setOnClickListener(this);

    button = (Button) findViewById(R.id.answer_c);
    noteButtonMap.put(Tone.C, R.id.answer_c);
    button.setOnClickListener(this);

    button = (Button) findViewById(R.id.answer_d);
    noteButtonMap.put(Tone.D, R.id.answer_d);
    button.setOnClickListener(this);

    button = (Button) findViewById(R.id.answer_e);
    noteButtonMap.put(Tone.E, R.id.answer_e);
    button.setOnClickListener(this);

    button = (Button) findViewById(R.id.answer_f);
    noteButtonMap.put(Tone.F, R.id.answer_f);
    button.setOnClickListener(this);

    button = (Button) findViewById(R.id.answer_g);
    noteButtonMap.put(Tone.G, R.id.answer_g);
    button.setOnClickListener(this);
  }

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

    setContentView(R.layout.note_identification);

    prefs = PreferenceManager.getDefaultSharedPreferences(this);
    soundEnabled = prefs.getBoolean("noteSoundEnabled", true);
    soundDuration = Integer.parseInt(prefs.getString("noteSoundDuration", "0"));
    soundInstrument = Integer.parseInt(prefs.getString("noteSoundInstrument", "8"));

    setupListeners();
  }

}

Java Source Code List

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