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 efed992..298d17c 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
@@ -71,7 +71,7 @@ class SplitViewFragment : Fragment() {
     }
 
     override fun onPause() {
-        //stopAll()
+        stopAll()
         super.onPause()
         Log.d("${TAG}_$mPageNum", "onPause()")
     }
@@ -201,15 +201,15 @@ class SplitViewFragment : Fragment() {
         }
     }.start()
 
-    fun stopAll() /*= MainScope().launch(Dispatchers.Main)*/ {
-        if (videoViews.isEmpty()) return
+    fun stopAll() = MainScope().launch(Dispatchers.Main) {
+        if (videoViews.isEmpty()) return@launch
         for (index in data.indices) {
             videoViews[index].stopRetryCount()
             if (!videoViews[index].isPlaying || videoViews[index].isLoading) continue
             videoViews[index].stop()
             //delay(300)
         }
-    }//.start()
+    }.start()
 
     fun destroyAll() /*= MainScope().launch(Dispatchers.Main)*/ {
         if (videoViews.isEmpty()) return
diff --git a/gstreamer_player/src/com/hisharp/gstreamer_player/GstLibrary.java b/gstreamer_player/src/com/hisharp/gstreamer_player/GstLibrary.java
index ecc6637..781e4cf 100644
--- a/gstreamer_player/src/com/hisharp/gstreamer_player/GstLibrary.java
+++ b/gstreamer_player/src/com/hisharp/gstreamer_player/GstLibrary.java
@@ -25,6 +25,8 @@ public class GstLibrary implements Closeable, SurfaceHolder.Callback {
 
     private String tag = "";
 
+    private Boolean isInit = false;
+
     public GstLibrary(Context context) {
         this.mAppContext = context.getApplicationContext();
 
@@ -53,10 +55,12 @@ public class GstLibrary implements Closeable, SurfaceHolder.Callback {
     //private final String defaultMediaUri = "rtsp://admin:admin@192.168.0.77:554/media/video2";
 
     public void play() {
+        if (!isInit) return;
         nativePlay();
     }
 
     public void stop() {
+        if (!isInit) return;
         nativePause();
     }
 
@@ -70,6 +74,7 @@ public class GstLibrary implements Closeable, SurfaceHolder.Callback {
     }
 
     public void releaseSurface() {
+        isInit = false;
         nativeSurfaceFinalize();
     }
 
@@ -113,6 +118,8 @@ public class GstLibrary implements Closeable, SurfaceHolder.Callback {
         if (rtspUrl != null) {
             nativeSetUri(rtspUrl);
         }
+
+        isInit = true;
     }
 
     // Called from native code when the size of the media changes or is first detected.
@@ -134,6 +141,7 @@ public class GstLibrary implements Closeable, SurfaceHolder.Callback {
 
     @Override
     public void close() throws IOException {
+        isInit = false;
         try {
             nativeFinalize();
         } catch (Exception e) {
@@ -144,7 +152,8 @@ public class GstLibrary implements Closeable, SurfaceHolder.Callback {
     @Override
     public void surfaceCreated(SurfaceHolder holder) {
         Log.d(TAG + "+" + tag, "Surface created: " + holder.getSurface());
-        Log.i (TAG + "+" + tag, "GStreamer surfaceCreated:");
+        Log.i (TAG + "+" + tag, "GStreamer surfaceCreated");
+        isInit = true;
         nativeSurfaceInit(holder.getSurface());
     }
 
@@ -158,5 +167,6 @@ public class GstLibrary implements Closeable, SurfaceHolder.Callback {
     public void surfaceDestroyed(SurfaceHolder holder) {
         Log.d(TAG + "+" + tag, "Surface destroyed");
         releaseSurface();
+        isInit = false;
     }
 }