diff --git a/app/build.gradle b/app/build.gradle
index c5f62dc3..b44a52c3 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -9,8 +9,8 @@ android {
         applicationId "com.stardust.scriptdroid"
         minSdkVersion 17
         targetSdkVersion 23
-        versionCode 214
-        versionName "3.0.0 Alpha15"
+        versionCode 215
+        versionName "3.0.0 Alpha16"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         multiDexEnabled true
         ndk {
diff --git a/autojs/src/main/java/com/stardust/autojs/runtime/ScriptRuntime.java b/autojs/src/main/java/com/stardust/autojs/runtime/ScriptRuntime.java
index 2172b923..e6385aef 100644
--- a/autojs/src/main/java/com/stardust/autojs/runtime/ScriptRuntime.java
+++ b/autojs/src/main/java/com/stardust/autojs/runtime/ScriptRuntime.java
@@ -27,6 +27,7 @@ import com.stardust.autojs.runtime.exception.ScriptInterruptedException;
 import com.stardust.autojs.core.accessibility.SimpleActionAutomator;
 import com.stardust.concurrent.VolatileBox;
 import com.stardust.autojs.runtime.api.UI;
+import com.stardust.concurrent.VolatileDispose;
 import com.stardust.pio.UncheckedIOException;
 import com.stardust.util.ClipboardUtil;
 import com.stardust.autojs.core.util.ProcessShell;
@@ -237,7 +238,7 @@ public class ScriptRuntime {
         if (Looper.myLooper() == Looper.getMainLooper()) {
             return ClipboardUtil.getClipOrEmpty(mUiHandler.getContext()).toString();
         }
-        final VolatileBox<String> clip = new VolatileBox<>("");
+        final VolatileDispose<String> clip = new VolatileDispose<>();
         mUiHandler.post(new Runnable() {
             @Override
             public void run() {
diff --git a/automator/src/main/java/com/stardust/automator/GlobalActionAutomator.java b/automator/src/main/java/com/stardust/automator/GlobalActionAutomator.java
index 7a96a76b..c25a7cde 100644
--- a/automator/src/main/java/com/stardust/automator/GlobalActionAutomator.java
+++ b/automator/src/main/java/com/stardust/automator/GlobalActionAutomator.java
@@ -11,6 +11,7 @@ import android.support.annotation.RequiresApi;
 import android.view.ViewConfiguration;
 
 import com.stardust.concurrent.VolatileBox;
+import com.stardust.concurrent.VolatileDispose;
 import com.stardust.util.ScreenMetrics;
 
 /**
@@ -110,7 +111,7 @@ public class GlobalActionAutomator {
 
     @RequiresApi(api = Build.VERSION_CODES.N)
     private boolean gesturesWithHandler(GestureDescription description) {
-        final VolatileBox<Boolean> result = new VolatileBox<>(false);
+        final VolatileDispose<Boolean> result = new VolatileDispose<>();
         mService.dispatchGesture(description, new AccessibilityService.GestureResultCallback() {
             @Override
             public void onCompleted(GestureDescription gestureDescription) {
diff --git a/common/src/main/java/com/stardust/concurrent/VolatileDispose.java b/common/src/main/java/com/stardust/concurrent/VolatileDispose.java
new file mode 100644
index 00000000..4c3ffa21
--- /dev/null
+++ b/common/src/main/java/com/stardust/concurrent/VolatileDispose.java
@@ -0,0 +1,52 @@
+package com.stardust.concurrent;
+
+/**
+ * Created by Stardust on 2017/10/28.
+ */
+
+public class VolatileDispose<T> {
+
+    private volatile T mValue;
+
+    public T blockedGet() {
+        synchronized (this) {
+            if (mValue != null) {
+                return mValue;
+            }
+            try {
+                this.wait();
+            } catch (InterruptedException e) {
+                throw new RuntimeException(e);
+            }
+        }
+        return mValue;
+    }
+
+    public T blockedGetOrThrow(Class<? extends RuntimeException> exception) {
+        synchronized (this) {
+            if (mValue != null) {
+                return mValue;
+            }
+            try {
+                this.wait();
+            } catch (InterruptedException e) {
+                try {
+                    throw exception.newInstance();
+                } catch (InstantiationException e1) {
+                    throw new RuntimeException(e1);
+                } catch (IllegalAccessException e1) {
+                    throw new RuntimeException(e1);
+                }
+            }
+        }
+        return mValue;
+    }
+
+    public void setAndNotify(T value) {
+        synchronized (this) {
+            mValue = value;
+            notify();
+        }
+    }
+
+}