diff --git a/app/src/main/java/org/ntlab/amaryllis/client/voiceservice/PlayListManager.java b/app/src/main/java/org/ntlab/amaryllis/client/voiceservice/PlayListManager.java
index b7fdd22..32bc7c9 100644
--- a/app/src/main/java/org/ntlab/amaryllis/client/voiceservice/PlayListManager.java
+++ b/app/src/main/java/org/ntlab/amaryllis/client/voiceservice/PlayListManager.java
@@ -1,18 +1,38 @@
 package org.ntlab.amaryllis.client.voiceservice;
 
-import android.location.Location;
-
 import java.util.ArrayList;
 
 public class PlayListManager {
-
-    public void addVoiceMemos(ArrayList<VoiceMemo> voicememo, Location location){
+    int index = 0;
+    ArrayList<VoiceMemo> playlist = new ArrayList<>();
+    ArrayList<VoiceMemo> unplayedlist = new ArrayList<>();
+    //範囲内にある全てのvoicememoのリストを作成
+    public void addVoiceMemos(ArrayList<VoiceMemo> voicememos){
+        for(int i = 0;i < voicememos.size(); i++) {
+            boolean exist = false;
+            for(int j = 0;j < playlist.size(); j++){
+                if(voicememos.get(i).getVid().equals(playlist.get(j).getVid()))
+                  exist = true;
+            }
+            if(exist = false)
+              playlist.add(voicememos.get(i));
+        }
     }
 
-    public void getPlayList(){
+    //範囲内にある全てのvoicememoのリスト
+    public ArrayList<VoiceMemo> getPlayList(){
+        return playlist;
     }
-
-    public void getUnplayed(){
+    //まだ聞いていないvoicememoのリスト
+    public ArrayList<VoiceMemo> getUnplayedList(){
+        //毎回リストを返すのか？
+        unplayedlist.clear();
+        for(int i = index; i < playlist.size(); i++){
+            unplayedlist.add(playlist.get(i));
+        }
+        return unplayedlist;
     }
-
+    public void next(){
+        index++;
+    }
 }