Android Open Source - Music-Theory Note Quiz Preference 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;
/*from   ww w . jav  a 2  s  .  co  m*/
import java.util.Arrays;

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.CheckBoxPreference;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceChangeListener;
import android.preference.Preference.OnPreferenceClickListener;
import android.preference.PreferenceActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;

import com.mt.R;

public class NoteQuizPreferenceActivity extends PreferenceActivity implements OnClickListener,
    OnPreferenceClickListener, OnPreferenceChangeListener {

  public static final String[] CLEF_KEYS = {
    "noteClefAlto", "noteClefBass", "noteClefTenor", "noteClefTreble" };

  @Override
  public void onClick(View v) {
    Intent intent = new Intent(v.getContext(), NoteQuizActivity.class);
    startActivity(intent);
  }

  @Override
  public boolean onPreferenceChange(Preference preference, Object newValue) {
    preference.setSummary(getLedgerSummary((String) newValue));

    return true;
  }

  @Override
  public boolean onPreferenceClick(Preference preference) {
    SharedPreferences prefs = preference.getSharedPreferences();

    if (preference instanceof CheckBoxPreference) {
      CheckBoxPreference chkPref = (CheckBoxPreference) preference;
      if (Arrays.binarySearch(CLEF_KEYS, chkPref.getKey()) >= 0) {
        evaluateCheckboxGroup(prefs, chkPref, CLEF_KEYS);
      }
    }

    return true;
  }

  private void evaluateCheckboxGroup(SharedPreferences prefs, CheckBoxPreference pref, String[] keys) {
    boolean atLeastOneActive = false;
    for (String key : keys) {
      if (prefs.getBoolean(key, true)) {
        atLeastOneActive = true;
        break;
      }
    }

    if (!atLeastOneActive) {
      pref.setChecked(true);
    }
  }

  private String getLedgerSummary(String value) {
    if (value.equals("0")) {
      return "No Ledger Lines";
    } else if (value.equals("1")) {
      return "1 Ledger Line";
    } else {
      return value + " Ledger Lines";
    }
  }

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    requestWindowFeature(Window.FEATURE_NO_TITLE);

    super.onCreate(savedInstanceState);

    addPreferencesFromResource(R.xml.note_identification_preferences);
    setContentView(R.layout.preferences);

    for (String key : CLEF_KEYS) {
      findPreference(key).setOnPreferenceClickListener(this);
    }

    Button playButton = (Button) findViewById(R.id.btn_play);
    playButton.setOnClickListener(this);

    Preference pref = findPreference("noteUpperLedgers");
    pref.setOnPreferenceChangeListener(this);
    pref.setSummary(getLedgerSummary(pref.getSharedPreferences().getString("noteUpperLedgers", "2")));

    pref = findPreference("noteLowerLedgers");
    pref.setOnPreferenceChangeListener(this);
    pref.setSummary(getLedgerSummary(pref.getSharedPreferences().getString("noteLowerLedgers", "2")));
  }

}

Java Source Code List

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