Android Open Source - Music-Theory Key Signature Quiz Preference Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.mt.keys;
//  w  ww.  j  a v  a  2s. 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.preference.PreferenceManager;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;

import com.mt.R;

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

  public static final String[] CLEF_KEYS = {
    "keyClefAlto", "keyClefBass", "keyClefTenor", "keyClefTreble" };

  public static final String[] DISPLAY_TYPE_KEYS = {
    "keyFlats", "keySharps" };

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

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

      if (Arrays.binarySearch(DISPLAY_TYPE_KEYS, chkPref.getKey()) >= 0) {
        evaluateCheckboxGroup(prefs, chkPref, DISPLAY_TYPE_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);
    }
  }

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

    super.onCreate(savedInstanceState);

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

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

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

    Preference keyTypePref = findPreference("keyType");
    keyTypePref.setOnPreferenceChangeListener(this);
    keyTypePref.setSummary(PreferenceManager.getDefaultSharedPreferences(this).getString("keyType", "Major"));
  }
}

Java Source Code List

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