norohind/vanilla
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Share filter code and use SparseArray instead of HashMap

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This commit is contained in:
Christopher Eby 2010-03-08 19:18:17 -06:00
parent 3410917239
commit b767e4eca8
3 changed files with 38 additions and 36 deletions
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18
src/org/kreed/vanilla/AlbumAdapter.java
View File

@ -1,8 +1,5 @@
package org.kreed.vanilla;
import java.util.Arrays;
import java.util.HashMap;
import android.content.Context;
import android.graphics.Color;
import android.view.View;
@ -11,22 +8,9 @@ import android.widget.LinearLayout;
import android.widget.TextView;
public class AlbumAdapter extends AbstractAdapter {
private static Song[] filter(Song[] songs)
{
HashMap<Integer, Song> albums = new HashMap<Integer, Song>();
for (int i = songs.length; --i != -1; ) {
Song song = songs[i];
if (!albums.containsKey(song.albumId))
albums.put(song.albumId, song);
}
Song[] result = albums.values().toArray(new Song[0]);
Arrays.sort(result, new Song.AlbumComparator());
return result;
}
public AlbumAdapter(Context context, Song[] allSongs)
{
super(context, filter(allSongs));
super(context, Song.filter(allSongs, new Song.AlbumComparator()));
}
@Override

18
src/org/kreed/vanilla/ArtistAdapter.java
View File

@ -18,9 +18,6 @@
package org.kreed.vanilla;
import java.util.Arrays;
import java.util.HashMap;
import android.content.Context;
import android.graphics.Color;
import android.view.View;
@ -28,22 +25,9 @@ import android.view.ViewGroup;
import android.widget.TextView;
public class ArtistAdapter extends AbstractAdapter {
private static Song[] filter(Song[] songs)
{
HashMap<Integer, Song> artists = new HashMap<Integer, Song>();
for (int i = songs.length; --i != -1; ) {
Song song = songs[i];
if (!artists.containsKey(song.artistId))
artists.put(song.artistId, song);
}
Song[] result = artists.values().toArray(new Song[0]);
Arrays.sort(result, new Song.ArtistComparator());
return result;
}
public ArtistAdapter(Context context, Song[] allSongs)
{
super(context, filter(allSongs));
super(context, Song.filter(allSongs, new Song.ArtistComparator()));
}
@Override

38
src/org/kreed/vanilla/Song.java
View File

@ -18,6 +18,7 @@
package org.kreed.vanilla;
import java.util.Arrays;
import java.util.Comparator;
import android.content.ContentResolver;
@ -26,6 +27,7 @@ import android.net.Uri;
import android.os.Parcel;
import android.os.Parcelable;
import android.provider.MediaStore;
import android.util.SparseArray;
public class Song implements Parcelable {
int id;
@ -196,17 +198,49 @@ public class Song implements Parcelable {
}
}
public static class AlbumComparator implements Comparator<Song> {
public static class AlbumComparator implements IdComparator {
public int compare(Song a, Song b)
{
return a.album.compareTo(b.album);
}
public int getId(Song song)
{
return song.albumId;
}
}
public static class ArtistComparator implements Comparator<Song> {
public static class ArtistComparator implements IdComparator {
public int compare(Song a, Song b)
{
return a.artist.compareTo(b.artist);
}
public int getId(Song song)
{
return song.artistId;
}
}
public static interface IdComparator extends Comparator<Song> {
public int getId(Song song);
}
public static Song[] filter(Song[] songs, IdComparator comparator)
{
SparseArray<Song> albums = new SparseArray<Song>(songs.length);
for (int i = songs.length; --i != -1; ) {
Song song = songs[i];
int id = comparator.getId(song);
if (albums.get(id) == null)
albums.put(id, song);
}
Song[] result = new Song[albums.size()];
for (int i = result.length; --i != -1; )
result[i] = albums.valueAt(i);
Arrays.sort(result, comparator);
return result;
}
}