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 b61b248..ece75e1 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
@@ -12,6 +12,7 @@ import com.ray650128.gstreamer_demo_app.R
 import com.ray650128.gstreamer_demo_app.databinding.ActivityMainBinding
 import com.ray650128.gstreamer_demo_app.model.Device
 import kotlinx.coroutines.MainScope
+import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 
 class MainActivity : AppCompatActivity() {
@@ -20,9 +21,12 @@ class MainActivity : AppCompatActivity() {
 
     private val viewModel: MainViewModel by viewModels()
 
+    private val splitViewModel: SplitViewModel by viewModels()
+
     private val mContext: Context by lazy { this }
 
     private var splitMode = 1
+    private var oldSplitMode = 1
 
     private lateinit var splitVideoViewAdapter: VideoViewAdapter
 
@@ -52,8 +56,9 @@ class MainActivity : AppCompatActivity() {
             registerOnPageChangeCallback(object: ViewPager2.OnPageChangeCallback() {
                 override fun onPageSelected(position: Int) {
                     super.onPageSelected(position)
-                    splitVideoViewAdapter.stop(currentPage)
+                    /*splitVideoViewAdapter.stop(currentPage)*/
                     currentPage = position
+                    splitViewModel.activePage.postValue(position)
                     Log.d("Split", "currentPage: $currentPage")
                     /*for (i in 0 until splitVideoViewAdapter.itemCount) {
                         if (i == currentPage) continue
@@ -95,6 +100,11 @@ class MainActivity : AppCompatActivity() {
 
     private fun reloadVideoViews(list: List<List<Device>>?) = MainScope().launch {
         binding.viewPager.setCurrentItem(0, false)
+        for (i in 0 until splitVideoViewAdapter.itemCount) {
+            splitVideoViewAdapter.stop(i)
+        }
+        delay(oldSplitMode * 300L)
+        oldSplitMode = splitMode
         splitVideoViewAdapter.clear()
         // 如果群組內沒有裝置，則顯示底圖
         if (list.isNullOrEmpty()) {
@@ -109,6 +119,8 @@ class MainActivity : AppCompatActivity() {
                 )
                 splitVideoViewAdapter.add(i, splitFragment)
             }
+            currentPage = 0
+            binding.viewPager.currentItem = 0
         }
     }
 
diff --git a/app/src/main/java/com/ray650128/gstreamer_demo_app/ui/mainScreen/SplitViewFragment.kt b/app/src/main/java/com/ray650128/gstreamer_demo_app/ui/mainScreen/SplitViewFragment.kt
index 4444bff..f83756e 100644
--- a/app/src/main/java/com/ray650128/gstreamer_demo_app/ui/mainScreen/SplitViewFragment.kt
+++ b/app/src/main/java/com/ray650128/gstreamer_demo_app/ui/mainScreen/SplitViewFragment.kt
@@ -7,6 +7,7 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import androidx.fragment.app.Fragment
+import androidx.fragment.app.activityViewModels
 import androidx.gridlayout.widget.GridLayout
 import com.ray650128.gstreamer_demo_app.databinding.FragmentSplitViewBinding
 import com.ray650128.gstreamer_demo_app.dp
@@ -20,6 +21,8 @@ import kotlin.math.sqrt
 
 class SplitViewFragment : Fragment() {
 
+    val viewModel: SplitViewModel by activityViewModels()
+
     private var mPageNum: Int = 0
     private var splitMode = MainViewModel.PAGE_MODE_ONE
     private var streamType = VideoView.SUB_STREAM
@@ -52,6 +55,15 @@ class SplitViewFragment : Fragment() {
         super.onViewCreated(view, savedInstanceState)
 
         initView()
+
+        viewModel.activePage.observe(viewLifecycleOwner) {
+            if (it == null) return@observe
+            if (it == this.mPageNum) {
+                playAll()
+            } else {
+                stopAll()
+            }
+        }
     }
 
     override fun onPause() {
@@ -62,9 +74,11 @@ class SplitViewFragment : Fragment() {
 
     override fun onResume() {
         super.onResume()
-        MainScope().launch {
-            delay(1000)
-            playAll()
+        if (viewModel.activePage.value == mPageNum) {
+            MainScope().launch {
+                delay(splitMode * 300L)
+                playAll()
+            }
         }
         Log.d("${TAG}_$mPageNum", "onResume()")
     }
@@ -140,8 +154,9 @@ class SplitViewFragment : Fragment() {
                                 }
                                 return@setOnClickListener
                             }
-                            stopAll()
                             MainScope().launch {
+                                stopAll()
+                                delay(splitMode * 300L)
                                 val item = data[position]
                                 val bundle = Bundle().apply {
                                     //putInt(MonitoringActivity.BUNDLE_DEVICE_ID, item.id)
@@ -175,9 +190,10 @@ class SplitViewFragment : Fragment() {
             videoViews[index].play()
             delay(300)
         }
-    }
+    }.start()
 
     fun stopAll() = MainScope().launch(Dispatchers.Main) {
+        if (videoViews.isEmpty()) return@launch
         for (index in data.indices) {
             videoViews[index].stopRetryCount()
             videoViews[index].stop()
diff --git a/app/src/main/java/com/ray650128/gstreamer_demo_app/ui/mainScreen/SplitViewModel.kt b/app/src/main/java/com/ray650128/gstreamer_demo_app/ui/mainScreen/SplitViewModel.kt
new file mode 100644
index 0000000..be3183e
--- /dev/null
+++ b/app/src/main/java/com/ray650128/gstreamer_demo_app/ui/mainScreen/SplitViewModel.kt
@@ -0,0 +1,10 @@
+package com.ray650128.gstreamer_demo_app.ui.mainScreen
+
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+
+class SplitViewModel : ViewModel() {
+    val activePage: MutableLiveData<Int> by lazy {
+        MutableLiveData()
+    }
+}
\ No newline at end of file