Android Open Source - PlayTunes Search Songs Adapter

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License

The source code is released under:

Copyright (c) 2014, Impeccable Labs, LLC. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions ar...

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Java Source Code

package com.ideabag.playtunes.adapter.search;
/*  w w  w .j  a va2 s .  c  om*/
import com.ideabag.playtunes.adapter.SongListAdapter;
import com.ideabag.playtunes.database.MediaQuery;
import com.ideabag.playtunes.util.ISearchableAdapter;

import android.content.Context;
import android.provider.MediaStore;
import android.view.View.OnClickListener;

public class SearchSongsAdapter extends SongListAdapter implements ISearchableAdapter {
  
  private static final String SEPARATORS = ":|;|,|.|-|_|\"|'|\\s|";
  
  public static final String TAG = "SongSearchAdapter";
  
  private int mTruncateAmount;
  
  public SearchSongsAdapter( Context context, OnClickListener menuClickListener, String searchTerms, int truncated, MediaQuery.OnQueryCompletedListener listener ) {
    super(context, menuClickListener);
    
    mTruncateAmount = truncated;
    
    setOnQueryCompletedListener( listener );
    
    if ( null != searchTerms && searchTerms.length() > 0 ) {
      
      setSearchTerms( searchTerms );
        
    }
    
  }
  
  //
  // This is where the search query is generated using the SQL LIKE operator, we use a dumb algorithm to determine a 'best' match
  // If a term is anywhere in the title, artist, or album ('%term%') it gets 3 points,
  // if a term is at the beginning of the title, artist, or album ('term%') it gets 30 points
  // if a term is in the title, artist, or album and is preceded by whitespace (' +term%') it gets 9 points
  // 
  
  @Override public void setSearchTerms( String searchTerms ) {
    
    String[] terms = searchTerms.split( "\\s+" );
    
    String mRelevance = "("; 
    
    for ( int i = 0, count = terms.length; i < count; i++ ) {
      
      String term = terms[ i ];
      
      if ( i > 0 ) {
        
        mRelevance += "+";
        
      }
      
      mRelevance += "3 * (" + MediaStore.Audio.Media.TITLE + " LIKE '%" + term + "%' )";
      mRelevance += "+ 30 * (" + MediaStore.Audio.Media.TITLE + " LIKE '" + term + "%' )";
      mRelevance += "+ 9 * (" + MediaStore.Audio.Media.TITLE + " LIKE '% +" + term + "%' )";
      
      mRelevance += "+ (" + MediaStore.Audio.Media.ARTIST + " LIKE '%" + term + "%' )";
      mRelevance += "+ 10 * (" + MediaStore.Audio.Media.ARTIST + " LIKE '" + term + "%' )";
      mRelevance += "+ 3 * (" + MediaStore.Audio.Media.ARTIST + " LIKE '% +" + term + "%' )";
      
      mRelevance += "+ (" + MediaStore.Audio.Media.ALBUM + " LIKE '%" + term + "%' )";
      mRelevance += "+ 10 * (" + MediaStore.Audio.Media.ALBUM + " LIKE '" + term + "%' )";
      mRelevance += "+ 3 * (" + MediaStore.Audio.Media.ALBUM + " LIKE '% +" + term + "%' )";
      
    }
    
    mRelevance += ") WEIGHT";
    
      String[] songSearchSelection = new String[] {
          
          MediaStore.Audio.Media._ID,
          
          MediaStore.Audio.Media.TITLE,
          MediaStore.Audio.Media.ARTIST,
          MediaStore.Audio.Media.ALBUM,
          MediaStore.Audio.Media.TRACK,
          MediaStore.Audio.Media.DATA,
          MediaStore.Audio.Media.ALBUM_ID,
          MediaStore.Audio.Media.ARTIST_ID,
          mRelevance
          
        };
      
      //android.util.Log.i( TAG + "@setQuery", "Weight projection: " + mRelevance );
    
      mQuery = new MediaQuery(
        MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
        songSearchSelection,
        MediaStore.Audio.Media.IS_MUSIC + " != 0 AND WEIGHT > 0",
        null,
        "WEIGHT DESC"
        );
      
      //setMediaQuery( mQuery );
      requery();
      
  }
  
  @Override public int getCount() {
    
    int count = 0;
    
    if ( null != mCursor ) {
      
      if ( mTruncateAmount <= 0 ) {
        
        count = mCursor.getCount();
        
      } else {
        
        count = ( mCursor.getCount() > mTruncateAmount ? mTruncateAmount : mCursor.getCount() );
        
      }
      
    }
    
    return count;
    
  }
  
  public int hasMore() {
    
    return ( mCursor != null && mTruncateAmount > 0 && mCursor.getCount() > mTruncateAmount ? mCursor.getCount() - mTruncateAmount : 0 );
    
  }
  
  public void setTruncateAmount( int mAmt ) {
    
    mTruncateAmount = mAmt;
    notifyDataSetChanged();
    
  }
  
}

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