diff --git a/app/src/main/java/com/google/android/accessibility/selecttospeak/SelectToSpeakService.java b/app/src/main/java/com/google/android/accessibility/selecttospeak/SelectToSpeakService.java
index 940555c..54acbdf 100644
--- a/app/src/main/java/com/google/android/accessibility/selecttospeak/SelectToSpeakService.java
+++ b/app/src/main/java/com/google/android/accessibility/selecttospeak/SelectToSpeakService.java
@@ -35,6 +35,7 @@ import io.reactivex.rxjava3.annotations.NonNull;
 import io.reactivex.rxjava3.core.Observable;
 import io.reactivex.rxjava3.core.ObservableEmitter;
 import io.reactivex.rxjava3.core.ObservableOnSubscribe;
+import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.functions.Consumer;
 
 /**
@@ -69,14 +70,16 @@ public class SelectToSpeakService extends AccessibilityService {
 
     private static final int WAIT_TIME = 1500;
 
-
     private WechatContact mContact;
+    private String mName = "";//微信昵称
+
     private int mCallType = TYPE_VOICE;
 
     private Step mCurrentStep = Step.WAITING;
-    private String mName = "";//微信昵称
     private boolean mAutoAccept = false;
 
+    private Disposable mDisposable;
+
     public interface AccessibilityEventCallback {
         void onAccessibilityEventCallback(AccessibilityEvent accessibilityEvent);
     }
@@ -94,7 +97,7 @@ public class SelectToSpeakService extends AccessibilityService {
     }
 
     private void dealingAccessibilityEvent() {
-        Observable.create(new ObservableOnSubscribe<AccessibilityEvent>() {
+        mDisposable = Observable.create(new ObservableOnSubscribe<AccessibilityEvent>() {
             @Override
             public void subscribe(@NonNull ObservableEmitter<AccessibilityEvent> emitter) throws Throwable {
                 mAccessibilityEventCallback = emitter::onNext;
@@ -107,6 +110,7 @@ public class SelectToSpeakService extends AccessibilityService {
                         _onAccessibilityEvent(accessibilityEvent);
                     }
                 });
+        Log.e(TAG, "dealingAccessibilityEvent: mDisposable hash = " + mDisposable.hashCode());
     }
 
     @Override
@@ -135,6 +139,10 @@ public class SelectToSpeakService extends AccessibilityService {
         if (mSettingBroadcastReceiver != null) {
             unregisterReceiver(mSettingBroadcastReceiver);
         }
+        if (mDisposable != null && !mDisposable.isDisposed()) {
+            mDisposable.dispose();
+            mDisposable = null;
+        }
     }
 
     @Override