diff --git a/app/src/main/java/com/lizongying/mytv0/MainActivity.kt b/app/src/main/java/com/lizongying/mytv0/MainActivity.kt
index 175eecc..1dd9f5e 100644
--- a/app/src/main/java/com/lizongying/mytv0/MainActivity.kt
+++ b/app/src/main/java/com/lizongying/mytv0/MainActivity.kt
@@ -31,8 +31,6 @@ class MainActivity : FragmentActivity() {
 
     private var doubleBackToExitPressedOnce = false
 
-    private var position = 0
-
     private lateinit var gestureDetector: GestureDetector
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -136,7 +134,7 @@ class MainActivity : FragmentActivity() {
     }
 
     fun prev() {
-        position = TVList.position.value?.dec() ?: 0
+        var position = TVList.position.value?.dec() ?: 0
         if (position == -1) {
             position = TVList.size() - 1
         }
@@ -144,7 +142,7 @@ class MainActivity : FragmentActivity() {
     }
 
     fun next() {
-        position = TVList.position.value?.inc() ?: 0
+        var position = TVList.position.value?.inc() ?: 0
         if (position == TVList.size()) {
             position = 0
         }
@@ -431,6 +429,13 @@ class MainActivity : FragmentActivity() {
         return super.onKeyDown(keyCode, event)
     }
 
+    override fun onStop() {
+        super.onStop()
+        SP.positionGroup = TVList.groupModel.position.value!!
+        SP.position = TVList.position.value!!
+        Log.i(TAG, "position ${TVList.position.value!!} saved")
+    }
+
     companion object {
         private const val TAG = "MainActivity"
     }
diff --git a/app/src/main/java/com/lizongying/mytv0/SP.kt b/app/src/main/java/com/lizongying/mytv0/SP.kt
index 372b80a..694cd5d 100644
--- a/app/src/main/java/com/lizongying/mytv0/SP.kt
+++ b/app/src/main/java/com/lizongying/mytv0/SP.kt
@@ -17,7 +17,7 @@ object SP {
     // Position in list of the selected channel item
     private const val KEY_POSITION = "position"
 
-    private const val KEY_POSITION_CATEGORY = "position_group"
+    private const val KEY_POSITION_GROUP = "position_group"
 
     private const val KEY_POSITION_SUB = "position_sub"
 
@@ -49,9 +49,9 @@ object SP {
         get() = sp.getInt(KEY_POSITION, 0)
         set(value) = sp.edit().putInt(KEY_POSITION, value).apply()
 
-    var positionCategory: Int
-        get() = sp.getInt(KEY_POSITION_CATEGORY, 0)
-        set(value) = sp.edit().putInt(KEY_POSITION_CATEGORY, value).apply()
+    var positionGroup: Int
+        get() = sp.getInt(KEY_POSITION_GROUP, 0)
+        set(value) = sp.edit().putInt(KEY_POSITION_GROUP, value).apply()
 
     var positionSub: Int
         get() = sp.getInt(KEY_POSITION_SUB, 0)
diff --git a/app/src/main/java/com/lizongying/mytv0/models/TVGroupModel.kt b/app/src/main/java/com/lizongying/mytv0/models/TVGroupModel.kt
index 1010c16..9f86d2e 100644
--- a/app/src/main/java/com/lizongying/mytv0/models/TVGroupModel.kt
+++ b/app/src/main/java/com/lizongying/mytv0/models/TVGroupModel.kt
@@ -35,7 +35,7 @@ class TVGroupModel : ViewModel() {
     }
 
     init {
-        _position.value = SP.positionCategory
+        _position.value = SP.positionGroup
     }
 
     fun size(): Int {