diff --git a/app/src/main/java/org/ntlab/amaryllis/client/entities/Category.java b/app/src/main/java/org/ntlab/amaryllis/client/entities/Category.java
new file mode 100644
index 0000000..3e44534
--- /dev/null
+++ b/app/src/main/java/org/ntlab/amaryllis/client/entities/Category.java
@@ -0,0 +1,41 @@
+package org.ntlab.amaryllis.client.entities;
+
+
+
+public class Category {
+    private String cid;
+    private String name;
+    /**
+     * 文字列表現された色情報
+     */
+    private String color;
+    public Category(String cid,String name,String color){
+        this.cid=cid;
+        this.name=name;
+        this.color=color;
+    }
+
+    public String getcId() {
+        return cid;
+    }
+
+    public String getName() {
+        return name;
+    }
+    public String getColor(){
+        return color;
+    }
+    public void setCid(String cid) {
+        this.cid = cid;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void setColor(String color) {
+        this.color = color;
+    }
+
+
+}
diff --git a/app/src/main/java/org/ntlab/amaryllis/client/entities/Voicememo.java b/app/src/main/java/org/ntlab/amaryllis/client/entities/Voicememo.java
index b644ad5..84c46a3 100644
--- a/app/src/main/java/org/ntlab/amaryllis/client/entities/Voicememo.java
+++ b/app/src/main/java/org/ntlab/amaryllis/client/entities/Voicememo.java
@@ -4,12 +4,10 @@
 
 import org.w3c.dom.Comment;
 
-import java.io.File;
 import java.util.ArrayList;
 import java.util.Calendar;
 import java.util.Collection;
 import java.util.HashMap;
-import java.util.UUID;
 
 public class Voicememo {
     private String vid;
diff --git a/app/src/main/java/org/ntlab/amaryllis/client/resources/CategoriesRest.java b/app/src/main/java/org/ntlab/amaryllis/client/resources/CategoriesRest.java
new file mode 100644
index 0000000..5f26a14
--- /dev/null
+++ b/app/src/main/java/org/ntlab/amaryllis/client/resources/CategoriesRest.java
@@ -0,0 +1,22 @@
+package org.ntlab.amaryllis.client.resources;
+
+import org.ntlab.amaryllis.client.entities.Category;
+
+import java.util.ArrayList;
+
+import retrofit2.Call;
+import retrofit2.http.GET;
+import retrofit2.http.Path;
+
+
+public interface CategoriesRest {
+    //すべてのcidを取得
+    @GET("categories")
+    Call<ArrayList<Category>> getcategories();
+
+    //指定したカテゴリを取得
+    @GET("categories/{cid}")
+    Call<Category> category(
+        @Path("cid") String cid
+    );
+}
diff --git a/build.gradle b/build.gradle
index 92a0c3b..b58dc04 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,7 @@
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.0'
+        classpath 'com.android.tools.build:gradle:4.0.1'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files