diff --git a/app/src/main/java/org/ntlab/amaryllis/client/MainActivity.java b/app/src/main/java/org/ntlab/amaryllis/client/MainActivity.java
index 3319aba..dbb8327 100644
--- a/app/src/main/java/org/ntlab/amaryllis/client/MainActivity.java
+++ b/app/src/main/java/org/ntlab/amaryllis/client/MainActivity.java
@@ -46,18 +46,28 @@
 import org.ntlab.amaryllis.client.fragment.MapsFragment;
 import org.ntlab.amaryllis.client.resources.AccountsRest;
 import org.ntlab.amaryllis.client.resources.CategoriesRest;
+import org.ntlab.amaryllis.client.resources.VoicememosRest;
 import org.ntlab.amaryllis.client.voiceservice.TestVoiceService;
 import org.ntlab.amaryllis.client.voiceservice.VoiceMemo;
 
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 
+import okhttp3.OkHttpClient;
+import okhttp3.ResponseBody;
 import retrofit2.Call;
 import retrofit2.Callback;
 import retrofit2.Response;
 import retrofit2.Retrofit;
 import retrofit2.converter.jackson.JacksonConverterFactory;
+import retrofit2.http.GET;
+import retrofit2.http.Url;
 
 
 public class MainActivity extends AppCompatActivity implements LocationListener {
@@ -176,7 +186,7 @@
         manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
 
 
-
+        install("12adfee2-35ad-4c98-85a7-046206420ec2.3gp");
 
     }
 
@@ -285,6 +295,84 @@
         return categories;
     }
 
+    public interface IVoice {
+        // option 2: using a dynamic URL
+        @GET
+        Call<ResponseBody> downloadVoiceFile(@Url String fileUrl);
+    }
+    void install(String u){
+        Retrofit retrofit = new Retrofit.Builder()
+                .baseUrl("http://nitta-lab-www.is.konan-u.ac.jp/data/")
+                .addConverterFactory(JacksonConverterFactory.create())
+                .build();
+        IVoice ivoice = retrofit.create(IVoice.class);
+        Call<ResponseBody> call = ivoice.downloadVoiceFile(u);
+        call.enqueue(new Callback<ResponseBody>() {
+            @Override
+            public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
+                if (response.isSuccessful()){
+                    boolean writtenToDisk = writeResponseBodyToDisk(response.body());
+
+
+                }
+            }
+
+            @Override
+            public void onFailure(Call<ResponseBody> call, Throwable t) {
+
+            }
+        });
+    }
+    private boolean writeResponseBodyToDisk(ResponseBody body) {
+        try {
+            // todo change the file location/name according to your needs
+            File futureStudioIconFile = new File( this.getExternalFilesDir(null).getAbsolutePath() + "/sample.3gp");
+
+            InputStream inputStream = null;
+            OutputStream outputStream = null;
+
+            try {
+                byte[] fileReader = new byte[409600];
+
+                long fileSize = body.contentLength();
+                long fileSizeDownloaded = 0;
+
+                inputStream = body.byteStream();
+                outputStream = new FileOutputStream(futureStudioIconFile);
+
+                while (true) {
+                    int read = inputStream.read(fileReader);
+
+                    if (read == -1) {
+                        break;
+                    }
+
+                    outputStream.write(fileReader, 0, read);
+
+                    fileSizeDownloaded += read;
+
+                    Log.d("File Download: " , fileSizeDownloaded + " of " + fileSize);
+                }
+
+                outputStream.flush();
+
+                return true;
+            } catch (IOException e) {
+                return false;
+            } finally {
+                if (inputStream != null) {
+                    inputStream.close();
+                }
+
+                if (outputStream != null) {
+                    outputStream.close();
+                }
+            }
+        } catch (IOException e) {
+            return false;
+        }
+    }
+
 //
 //    @Override
 //    public boolean onCreateOptionsMenu(Menu menu) {