diff --git a/app/src/leanback/java/com/fongmi/android/tv/ui/activity/VodActivity.java b/app/src/leanback/java/com/fongmi/android/tv/ui/activity/VodActivity.java
index 80a899ad2..bcda2a45e 100644
--- a/app/src/leanback/java/com/fongmi/android/tv/ui/activity/VodActivity.java
+++ b/app/src/leanback/java/com/fongmi/android/tv/ui/activity/VodActivity.java
@@ -2,7 +2,6 @@ package com.fongmi.android.tv.ui.activity;
 
 import android.app.Activity;
 import android.content.Intent;
-import android.util.Log;
 import android.view.KeyEvent;
 import android.view.View;
 import android.view.ViewGroup;
@@ -128,12 +127,7 @@ public class VodActivity extends BaseActivity implements TypePresenter.OnClickLi
 
     private void onChildSelected(@Nullable RecyclerView.ViewHolder child) {
         if (mOldView != null) mOldView.setActivated(false);
-        if (child == null) {
-            Log.e("DDD", "DDD");
-            return;
-
-        }
-        Log.e("DDD", "1");
+        if (child == null) return;
         mOldView = child.itemView;
         mOldView.setActivated(true);
         App.post(mRunnable, 100);
diff --git a/app/src/main/java/com/fongmi/android/tv/bean/Device.java b/app/src/main/java/com/fongmi/android/tv/bean/Device.java
index c25d27dd1..09ac98d76 100644
--- a/app/src/main/java/com/fongmi/android/tv/bean/Device.java
+++ b/app/src/main/java/com/fongmi/android/tv/bean/Device.java
@@ -20,6 +20,7 @@ import com.google.gson.annotations.SerializedName;
 
 import java.util.Comparator;
 import java.util.List;
+import java.util.Objects;
 
 @Entity(indices = @Index(value = {"uuid", "name"}, unique = true))
 public class Device implements Diffable<Device> {
@@ -163,6 +164,11 @@ public class Device implements Diffable<Device> {
         AppDatabase.get().getDeviceDao().delete();
     }
 
+    @Override
+    public int hashCode() {
+        return Objects.hash(getUuid(), getName());
+    }
+
     @Override
     public boolean equals(@Nullable Object obj) {
         if (this == obj) return true;
diff --git a/app/src/main/java/com/fongmi/android/tv/ui/adapter/BaseDiffAdapter.java b/app/src/main/java/com/fongmi/android/tv/ui/adapter/BaseDiffAdapter.java
index dfb2d125c..2b2dd4208 100644
--- a/app/src/main/java/com/fongmi/android/tv/ui/adapter/BaseDiffAdapter.java
+++ b/app/src/main/java/com/fongmi/android/tv/ui/adapter/BaseDiffAdapter.java
@@ -10,6 +10,7 @@ import com.fongmi.android.tv.ui.adapter.diff.BaseItemCallback;
 import com.fongmi.android.tv.ui.adapter.diff.Diffable;
 
 import java.util.ArrayList;
+import java.util.Comparator;
 import java.util.List;
 
 public abstract class BaseDiffAdapter<T extends Diffable<T>, VH extends RecyclerView.ViewHolder> extends RecyclerView.Adapter<VH> {
@@ -44,8 +45,9 @@ public abstract class BaseDiffAdapter<T extends Diffable<T>, VH extends Recycler
         setItems(current);
     }
 
-    public void sort(java.util.Comparator<T> comparator) {
+    public void sort(Comparator<T> comparator) {
         List<T> current = new ArrayList<>(getItems());
+        if (current.isEmpty()) return;
         current.sort(comparator);
         setItems(current);
     }
diff --git a/app/src/mobile/java/com/fongmi/android/tv/ui/adapter/DeviceAdapter.java b/app/src/mobile/java/com/fongmi/android/tv/ui/adapter/DeviceAdapter.java
index d99225743..dad8f4d9f 100644
--- a/app/src/mobile/java/com/fongmi/android/tv/ui/adapter/DeviceAdapter.java
+++ b/app/src/mobile/java/com/fongmi/android/tv/ui/adapter/DeviceAdapter.java
@@ -28,6 +28,12 @@ public class DeviceAdapter extends BaseDiffAdapter<Device, DeviceAdapter.ViewHol
         boolean onLongClick(Device item);
     }
 
+    @Override
+    public void addItem(Device item) {
+        super.addItem(item);
+        sort(new Device.Sorter());
+    }
+
     @Override
     public void addItems(List<Device> items) {
         super.addItems(items);
diff --git a/app/src/mobile/java/com/fongmi/android/tv/ui/dialog/CastDialog.java b/app/src/mobile/java/com/fongmi/android/tv/ui/dialog/CastDialog.java
index 3d29b56bd..f3b5560e4 100644
--- a/app/src/mobile/java/com/fongmi/android/tv/ui/dialog/CastDialog.java
+++ b/app/src/mobile/java/com/fongmi/android/tv/ui/dialog/CastDialog.java
@@ -42,7 +42,7 @@ import org.greenrobot.eventbus.Subscribe;
 import org.greenrobot.eventbus.ThreadMode;
 
 import java.io.IOException;
-import java.util.List;
+import java.util.ArrayList;
 
 import kotlin.Unit;
 import okhttp3.Call;
@@ -122,11 +122,12 @@ public class CastDialog extends BaseDialog implements DeviceAdapter.OnClickListe
     }
 
     private void setRecyclerView() {
-        binding.recycler.setHasFixedSize(true);
+        binding.recycler.setHasFixedSize(false);
         binding.recycler.setAdapter(adapter = new DeviceAdapter(this));
     }
 
     private void getDevice() {
+        adapter.setItems(new ArrayList<>());
         if (fm) adapter.addItems(Device.getAll());
         adapter.addItems(DLNADevice.get().getAll());
     }
@@ -157,8 +158,8 @@ public class CastDialog extends BaseDialog implements DeviceAdapter.OnClickListe
     }
 
     @Override
-    public void onFind(List<Device> devices) {
-        if (!devices.isEmpty()) adapter.addItems(devices);
+    public void onFind(Device device) {
+        adapter.addItem(device);
     }
 
     @Override
diff --git a/app/src/mobile/java/com/fongmi/android/tv/ui/dialog/SyncDialog.java b/app/src/mobile/java/com/fongmi/android/tv/ui/dialog/SyncDialog.java
index 7cfa5dd3f..d4d2a2ac9 100644
--- a/app/src/mobile/java/com/fongmi/android/tv/ui/dialog/SyncDialog.java
+++ b/app/src/mobile/java/com/fongmi/android/tv/ui/dialog/SyncDialog.java
@@ -36,7 +36,6 @@ import org.greenrobot.eventbus.Subscribe;
 import org.greenrobot.eventbus.ThreadMode;
 
 import java.io.IOException;
-import java.util.List;
 import java.util.Locale;
 
 import okhttp3.Call;
@@ -111,12 +110,12 @@ public class SyncDialog extends BaseDialog implements DeviceAdapter.OnClickListe
     }
 
     private void setRecyclerView() {
-        binding.recycler.setHasFixedSize(true);
+        binding.recycler.setHasFixedSize(false);
         binding.recycler.setAdapter(adapter = new DeviceAdapter(this));
     }
 
     private void getDevice() {
-        adapter.addItems(Device.getAll());
+        adapter.setItems(Device.getAll());
         if (adapter.getItemCount() == 0) App.post(this::onRefresh, 1000);
     }
 
@@ -152,8 +151,8 @@ public class SyncDialog extends BaseDialog implements DeviceAdapter.OnClickListe
     }
 
     @Override
-    public void onFind(List<Device> devices) {
-        if (!devices.isEmpty()) adapter.addItems(devices);
+    public void onFind(Device device) {
+        adapter.addItem(device);
     }
 
     @Override
diff --git a/app/src/mobile/java/com/fongmi/android/tv/utils/ScanTask.java b/app/src/mobile/java/com/fongmi/android/tv/utils/ScanTask.java
index 7f35dc83c..155ad6195 100644
--- a/app/src/mobile/java/com/fongmi/android/tv/utils/ScanTask.java
+++ b/app/src/mobile/java/com/fongmi/android/tv/utils/ScanTask.java
@@ -6,11 +6,9 @@ import com.fongmi.android.tv.server.Server;
 import com.github.catvod.net.OkHttp;
 
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
-import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 
@@ -19,14 +17,12 @@ import okhttp3.Response;
 
 public class ScanTask {
 
-    private final List<Device> devices;
     private final OkHttpClient client;
 
     private ExecutorService executor;
     private Listener listener;
 
     public ScanTask(Listener listener) {
-        this.devices = Collections.synchronizedList(new ArrayList<>());
         this.client = OkHttp.client(1000);
         this.listener = listener;
     }
@@ -49,7 +45,7 @@ public class ScanTask {
     private void init() {
         if (executor != null) executor.shutdownNow();
         executor = Executors.newFixedThreadPool(20);
-        devices.clear();
+        OkHttp.cancel(client, "scan");
     }
 
     private void run(List<String> items) {
@@ -58,17 +54,11 @@ public class ScanTask {
             getDevice(items);
         } catch (Exception e) {
             e.printStackTrace();
-        } finally {
-            App.post(() -> {
-                if (listener != null) listener.onFind(devices);
-            });
         }
     }
 
-    private void getDevice(List<String> urls) throws Exception {
-        CountDownLatch cd = new CountDownLatch(urls.size() - 1);
-        for (String url : urls) executor.execute(() -> findDevice(cd, url));
-        cd.await();
+    private void getDevice(List<String> urls) {
+        for (String url : urls) executor.execute(() -> findDevice(url));
     }
 
     private List<String> getUrl(List<String> ips) {
@@ -79,19 +69,19 @@ public class ScanTask {
         return new ArrayList<>(urls);
     }
 
-    private void findDevice(CountDownLatch cd, String url) {
+    private void findDevice(String url) {
         if (url.contains(Server.get().getAddress())) return;
         try (Response res = OkHttp.newCall(client, url.concat("/device"), "scan").execute()) {
             Device device = Device.objectFrom(res.body().string());
-            if (device != null) devices.add(device.save());
+            if (device != null) App.post(() -> {
+                if (listener != null) listener.onFind(device.save());
+            });
         } catch (Exception ignored) {
-        } finally {
-            cd.countDown();
         }
     }
 
     public interface Listener {
 
-        void onFind(List<Device> devices);
+        void onFind(Device device);
     }
 }