diff --git a/app/src/main/java/com/monstar_lab/sample/android/java/MainActivity.java b/app/src/main/java/com/monstar_lab/sample/android/java/MainActivity.java
index c629f5a..e17322d 100644
--- a/app/src/main/java/com/monstar_lab/sample/android/java/MainActivity.java
+++ b/app/src/main/java/com/monstar_lab/sample/android/java/MainActivity.java
@@ -9,7 +9,9 @@
 import android.view.Menu;
 import android.view.MenuItem;
 
-public class MainActivity extends AppCompatActivity {
+import android.support.v4.app.FragmentActivity;
+
+public class MainActivity extends AppCompatActivity  {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {