Remove import cleanup
diff --git a/samples/drumthumper/src/main/java/com/google/oboe/samples/drumthumper/DrumThumperActivity.kt b/samples/drumthumper/src/main/java/com/google/oboe/samples/drumthumper/DrumThumperActivity.kt
index d973097..d9766fc 100644
--- a/samples/drumthumper/src/main/java/com/google/oboe/samples/drumthumper/DrumThumperActivity.kt
+++ b/samples/drumthumper/src/main/java/com/google/oboe/samples/drumthumper/DrumThumperActivity.kt
@@ -26,10 +26,17 @@
 import android.widget.LinearLayout
 import android.widget.SeekBar
 import android.widget.Toast
+
 import androidx.appcompat.app.AppCompatActivity
+
+import java.util.*
+
+import java.time.LocalDateTime;
+
 import java.time.LocalDateTime
 import java.util.Timer
 import kotlin.concurrent.schedule
+import kotlin.math.roundToInt
 
 
 class DrumThumperActivity : AppCompatActivity(),