diff --git a/app/src/main/java/org/ntlab/irisclient/viewmodels/DrawingStateViewModel.java b/app/src/main/java/org/ntlab/irisclient/viewmodels/DrawingStateViewModel.java
index 1c15164..be74306 100644
--- a/app/src/main/java/org/ntlab/irisclient/viewmodels/DrawingStateViewModel.java
+++ b/app/src/main/java/org/ntlab/irisclient/viewmodels/DrawingStateViewModel.java
@@ -1,5 +1,8 @@
 package org.ntlab.irisclient.viewmodels;
 
+import android.os.Debug;
+
+
 import  org.ntlab.irisclient.models.DrawingState;
 import org.ntlab.irisclient.resources.DrawingRest;
 import org.ntlab.irisclient.resources.RoomsRest;
@@ -9,6 +12,7 @@
 import androidx.lifecycle.ViewModel;
 
 import java.util.List;
+import java.util.Timer;
 
 import retrofit2.Retrofit;
 import retrofit2.Call;
@@ -38,6 +42,7 @@
         return this.stateMutableLiveData;
     }
 
+
     public void updateState(String rid) {
 
         final RoomsRest roomsRest = retrofit.create(RoomsRest.class);
diff --git a/app/src/main/java/org/ntlab/irisclient/viewmodels/TimerViewModel.java b/app/src/main/java/org/ntlab/irisclient/viewmodels/TimerViewModel.java
new file mode 100644
index 0000000..9254669
--- /dev/null
+++ b/app/src/main/java/org/ntlab/irisclient/viewmodels/TimerViewModel.java
@@ -0,0 +1,48 @@
+package org.ntlab.irisclient.viewmodels;
+
+
+import android.util.Log;
+        import android.view.MotionEvent;
+
+        import androidx.lifecycle.LiveData;
+        import androidx.lifecycle.MutableLiveData;
+        import androidx.lifecycle.ViewModel;
+
+        import java.util.ArrayList;
+        import java.util.Collection;
+        import java.util.HashMap;
+        import java.util.Random;
+        import java.util.concurrent.ScheduledThreadPoolExecutor;
+        import java.util.concurrent.TimeUnit;
+
+
+//-----------------------------------------------------------------
+//
+abstract class TimerViewModel extends ViewModel implements Runnable {
+
+    private ScheduledThreadPoolExecutor thread = null;
+
+
+    //-----------------------------------------------------------------
+    // 一定間隔でサーバー上の筆跡を取得する（GET）
+    @Override
+    public void run() {
+        update();
+    }
+
+    public abstract void update();
+
+    //-----------------------------------------------------------------
+    //何ミリ秒ごとにrun()を実行するかを決める
+    public void start(int interval) {
+        thread = new ScheduledThreadPoolExecutor(1);
+        thread.scheduleWithFixedDelay(this, interval, 1000L, TimeUnit.MILLISECONDS);
+    }
+
+    //-----------------------------------------------------------------
+    //
+    public void stop() {
+        thread.shutdown();
+    }
+    //-----------------------------------------------------------------
+}
\ No newline at end of file