diff --git a/app/src/main/res/layout/activity_voice_test.xml b/app/src/main/res/layout/activity_voice_test.xml
index 8f4b76a..0597e88 100644
--- a/app/src/main/res/layout/activity_voice_test.xml
+++ b/app/src/main/res/layout/activity_voice_test.xml
@@ -43,6 +43,7 @@
                 android:id="@+id/button4"
                 android:layout_width="68dp"
                 android:layout_height="51dp"
+                android:alpha="0"
                 android:text="再生" />
 
         </FrameLayout>