diff --git a/app/src/main/java/com/ray650128/gstreamer_demo_app/ui/mainScreen/MainActivity.kt b/app/src/main/java/com/ray650128/gstreamer_demo_app/ui/mainScreen/MainActivity.kt
index 52c104d..dce6756 100644
--- a/app/src/main/java/com/ray650128/gstreamer_demo_app/ui/mainScreen/MainActivity.kt
+++ b/app/src/main/java/com/ray650128/gstreamer_demo_app/ui/mainScreen/MainActivity.kt
@@ -70,16 +70,19 @@ class MainActivity : AppCompatActivity() {
         }
 
         button.setOnClickListener {
+            if (splitMode == MainViewModel.PAGE_MODE_ONE) return@setOnClickListener
             viewModel.setSplitMode(MainViewModel.PAGE_MODE_ONE)
             Log.e(TAG, "+++ split style: 1")
         }
 
         button2.setOnClickListener {
+            if (splitMode == MainViewModel.PAGE_MODE_FOUR) return@setOnClickListener
             viewModel.setSplitMode(MainViewModel.PAGE_MODE_FOUR)
             Log.e(TAG, "+++ split style: 4")
         }
 
         button3.setOnClickListener {
+            if (splitMode == MainViewModel.PAGE_MODE_NINE) return@setOnClickListener
             viewModel.setSplitMode(MainViewModel.PAGE_MODE_NINE)
             Log.e(TAG, "+++ split style: 9")
         }