diff --git a/Android/app/src/main/java/pub/doric/demo/DemoActivity.java b/Android/app/src/main/java/pub/doric/demo/DemoActivity.java
index 4c773d7c..31d88f4b 100644
--- a/Android/app/src/main/java/pub/doric/demo/DemoActivity.java
+++ b/Android/app/src/main/java/pub/doric/demo/DemoActivity.java
@@ -22,6 +22,7 @@ import android.widget.FrameLayout;
 
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.fragment.app.Fragment;
 
 import org.greenrobot.eventbus.EventBus;
 import org.greenrobot.eventbus.Subscribe;
@@ -41,7 +42,6 @@ import pub.doric.utils.DoricUtils;
  */
 public class DemoActivity extends AppCompatActivity {
     private DoricContext doricContext;
-    private DevPanel devPanel = new DevPanel();
     private SensorManagerHelper sensorHelper;
 
     @Override
@@ -59,10 +59,11 @@ public class DemoActivity extends AppCompatActivity {
         sensorHelper.setOnShakeListener(new SensorManagerHelper.OnShakeListener() {
             @Override
             public void onShake() {
-                if (devPanel.isAdded()) {
+                Fragment devPanel = getSupportFragmentManager().findFragmentByTag("DevPanel");
+                if (devPanel != null && devPanel.isAdded()) {
                     return;
                 }
-                devPanel.show(getSupportFragmentManager(), "DevPanel");
+                new DevPanel().show(getSupportFragmentManager(), "DevPanel");
             }
         });
     }
@@ -107,7 +108,7 @@ public class DemoActivity extends AppCompatActivity {
     @Override
     public boolean onKeyDown(int keyCode, KeyEvent event) {
         if (KeyEvent.KEYCODE_MENU == event.getKeyCode()) {
-            devPanel.show(getSupportFragmentManager(), "DevPanel");
+            new DevPanel().show(getSupportFragmentManager(), "DevPanel");
         }
         return super.onKeyDown(keyCode, event);
     }
diff --git a/Android/app/src/main/java/pub/doric/demo/MainActivity.java b/Android/app/src/main/java/pub/doric/demo/MainActivity.java
index 6ba6f31e..59a6ce2d 100644
--- a/Android/app/src/main/java/pub/doric/demo/MainActivity.java
+++ b/Android/app/src/main/java/pub/doric/demo/MainActivity.java
@@ -32,11 +32,9 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 
-import pub.doric.dev.DevPanel;
 import pub.doric.utils.DoricUtils;
 
 public class MainActivity extends AppCompatActivity {
-    private DevPanel devPanel = new DevPanel();
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -91,10 +89,6 @@ public class MainActivity extends AppCompatActivity {
             tv.setOnClickListener(new View.OnClickListener() {
                 @Override
                 public void onClick(View v) {
-                    if (position == 0) {
-                        devPanel.show(getSupportFragmentManager(), "DevPanel");
-                        return;
-                    }
                     Intent intent = new Intent(tv.getContext(), DemoActivity.class);
                     intent.putExtra("source", data[position]);
                     tv.getContext().startActivity(intent);
diff --git a/Android/doric/src/main/java/pub/doric/engine/DoricJSEngine.java b/Android/doric/src/main/java/pub/doric/engine/DoricJSEngine.java
index 2bf520bf..64a3dbad 100644
--- a/Android/doric/src/main/java/pub/doric/engine/DoricJSEngine.java
+++ b/Android/doric/src/main/java/pub/doric/engine/DoricJSEngine.java
@@ -40,6 +40,8 @@ import pub.doric.utils.DoricUtils;
  * @CreateDate: 2019-07-18
  */
 public class DoricJSEngine implements Handler.Callback, DoricTimerExtension.TimerCallback {
+
+    private HandlerThread handlerThread;
     private final Handler mJSHandler;
     private final DoricBridgeExtension mDoricBridgeExtension = new DoricBridgeExtension();
     private IDoricJSE mDoricJSE;
@@ -47,7 +49,7 @@ public class DoricJSEngine implements Handler.Callback, DoricTimerExtension.Time
     private final DoricRegistry mDoricRegistry = new DoricRegistry();
 
     public DoricJSEngine(final boolean isNative, final IStatusCallback statusCallback) {
-        HandlerThread handlerThread = new HandlerThread(this.getClass().getSimpleName());
+        handlerThread = new HandlerThread(this.getClass().getSimpleName());
         handlerThread.start();
         Looper looper = handlerThread.getLooper();
         mJSHandler = new Handler(looper, this);
@@ -171,6 +173,8 @@ public class DoricJSEngine implements Handler.Callback, DoricTimerExtension.Time
     public void teardown() {
         mDoricJSE.teardown();
         mTimerExtension.teardown();
+        handlerThread.quit();
+        mJSHandler.removeCallbacksAndMessages(null);
     }
 
     private void loadBuiltinJS(String assetName) {