Android Open Source - Timetable Alarm Sound Preference

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.timetable.android;
/*  w w w . j ava  2s  .  c  o m*/
import java.util.ArrayList;

import org.holoeverywhere.app.AlertDialog.Builder;
import org.holoeverywhere.preference.ListPreference;

import android.content.Context;
import android.content.DialogInterface;
import android.content.res.Resources;
import android.database.Cursor;
import android.media.MediaPlayer;
import android.net.Uri;
import android.provider.MediaStore;
import android.util.AttributeSet;

/*
 * Class, that allows user to choose alarm sound. Contains a list of all available sounds on device's SD card.
 * When user chooses sound in the list, it is played by MediaPlayer.
 * Than the preference is stored and used by AlarmDialogActivity, to play chosen sound.
 */
public class AlarmSoundPreference extends ListPreference {

  public static final String DEFAULT_ALARM_SOUND = "default_sound";
  
  public static final MediaPlayer getDefaulPlayer(Context context) {
    return MediaPlayer.create(context, R.raw.new_gitar);
  }
  
  //Activity, that has started preference.
  private Context mContext;
  
  private static final long MINIMAL_SOUND_DURATION = 1000L;
  
  private String selection = String.format(" %s != 0 and %s > %d", 
                        MediaStore.Audio.Media.IS_MUSIC, 
                        MediaStore.Audio.Media.DURATION,
                        MINIMAL_SOUND_DURATION);
  private String order = MediaStore.Audio.Media.TITLE;
  
  private String[] projection = {
          MediaStore.Audio.Media.TITLE,
          MediaStore.Audio.Media.DATA
  };
  
  private Resources mResources;
  
  private int mClickedDialogEntryIndex;
  
  MediaPlayer mPlayer = new MediaPlayer();
  
  ArrayList<String> songNames = new ArrayList<String>();
  ArrayList<String> songFiles = new ArrayList<String>();

  private void loadMedia(Uri uri) {
    Cursor cursor = mContext.getContentResolver().query(
            uri,
        projection,
            selection,
            null,
            order);
    if (cursor != null) {
      cursor.moveToFirst();
      while(cursor.moveToNext()) {
        songNames.add(cursor.getString(0));
        songFiles.add(cursor.getString(1));
      }
    }
  

  }
  public AlarmSoundPreference(Context context, AttributeSet attrs) {
    super(context, attrs);
    mContext = context;
    mResources = mContext.getResources();
    //Add default ringtone.
    songNames.add("Default");
    songFiles.add(DEFAULT_ALARM_SOUND);
    //Add media from SD card
    loadMedia(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI);
    //Add media from phone.
    loadMedia(MediaStore.Audio.Media.INTERNAL_CONTENT_URI);
  }
  
  public AlarmSoundPreference(Context context) {
    super(context);
    Logger.log("AlarmSouncPreference.onCreate(): preference is created.");
  }
  
  
  @Override
  public CharSequence[] getEntryValues() {
    return songFiles.toArray(new String[0]);
  }
  
  @Override
  public CharSequence[] getEntries() {
    return songNames.toArray(new String[0]);
  }
  
  @Override 
  protected void onPrepareDialogBuilder(Builder builder) {
    setEntries(getEntries());
    setEntryValues(getEntryValues());
    
      mClickedDialogEntryIndex = getValueIndex();
        builder.setSingleChoiceItems(getEntries(), mClickedDialogEntryIndex, 
            new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                      mClickedDialogEntryIndex = which;
                          //try to play selected sound
                      if (mPlayer.isPlaying()) {
                        mPlayer.reset();
                      }  
                      try {
                         mPlayer = new MediaPlayer();
                           String filename = songFiles.get(which);
                           if (filename == null || filename.equals(DEFAULT_ALARM_SOUND)) {
                             mPlayer.release();
                             mPlayer = getDefaulPlayer(mContext);
                           } else {
                             mPlayer.setDataSource(filename);
                           mPlayer.prepare();
                           }
                           
                           mPlayer.start();
                       } catch (Exception e) {
                         Logger.error("AlarmSoundPreference.onItemClick: " + e.toString());
                       }
                    }
           });
      builder.setPositiveButton(mResources.getString(R.string.alarm_sound_preference_dialog_button_positive), new DialogInterface.OnClickListener() {
      
      public void onClick(DialogInterface dialog, int which) {
        AlarmSoundPreference.this.onClick(dialog, DialogInterface.BUTTON_POSITIVE);
        dialog.dismiss();
      }
    
      });  
      
      builder.setNegativeButton(mResources.getString(R.string.alarm_sound_preference_dialog_button_negative), null);
  }
  
  private int getValueIndex() {
    return findIndexOfValue(getValue());
  }
  
  @Override
    protected void onDialogClosed(boolean positiveResult) {
        super.onDialogClosed(positiveResult);
        mPlayer.stop();
        if (positiveResult) {
            if (mClickedDialogEntryIndex < 0) {
              return;
            }
          String value = songFiles.get(mClickedDialogEntryIndex);
            callChangeListener(value);
            setValue(value);
        }
    }

}

Java Source Code List

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