diff --git a/app/build.gradle b/app/build.gradle
index 7cd3eb9f..e99537be 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -8,8 +8,8 @@ android {
         applicationId "com.stardust.scriptdroid"
         minSdkVersion 17
         targetSdkVersion 23
-        versionCode 256
-        versionName "3.1.0 Beta"
+        versionCode 257
+        versionName "3.1.1 Alpha"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         multiDexEnabled true
         ndk {
diff --git a/app/src/main/assets/sample/画图/函数图像.js b/app/src/main/assets/sample/画图/函数图像.js
new file mode 100644
index 00000000..32082284
--- /dev/null
+++ b/app/src/main/assets/sample/画图/函数图像.js
@@ -0,0 +1,24 @@
+"ui";
+ui.layout(
+    <frame>
+        <canvas id="graphic" w="*" h="*"/>
+    </frame>
+);
+
+var f = function(x){
+    return x * x + 3 * x - 4;
+}
+
+var paint = new Paint();
+paint.setStrokeWidth(2);
+var start = -5;
+var end = 5;
+
+ui.graphic.on("draw", function(canvas){
+    var w = canvas.getWidth();
+    for (var i = 0; i < w; i++) {
+        var x = (end - start) / w * i + start;
+        var y = f(x);
+        canvas.drawPoint(x, y, paint);
+    }
+});
\ No newline at end of file
diff --git a/app/src/main/java/com/stardust/scriptdroid/ui/edit/editor/JavaScriptHighlighter.java b/app/src/main/java/com/stardust/scriptdroid/ui/edit/editor/JavaScriptHighlighter.java
index 1d585219..d622a46a 100644
--- a/app/src/main/java/com/stardust/scriptdroid/ui/edit/editor/JavaScriptHighlighter.java
+++ b/app/src/main/java/com/stardust/scriptdroid/ui/edit/editor/JavaScriptHighlighter.java
@@ -96,14 +96,15 @@ public class JavaScriptHighlighter implements SimpleTextWatcher.AfterTextChanged
         TokenStream ts = new TokenStream(null, sourceString, 0);
         HighlightTokens highlightTokens = new HighlightTokens(sourceString);
         int token;
+        int color = mTheme.getColorForToken(Token.NAME);
         while ((token = ts.getToken()) != Token.EOF) {
             if (mRunningHighlighterId.get() != id)
                 return;
-            int color = mTheme.getColorForToken(token);
+            color = mTheme.getColorForToken(token);
             highlightTokens.addToken(ts.getTokenBeg(), ts.getTokenEnd(), color);
         }
         if (highlightTokens.getCharCount() < sourceString.length()) {
-            highlightTokens.addToken(highlightTokens.getCharCount(), sourceString.length(), mTheme.getColorForToken(Token.NAME));
+            highlightTokens.addToken(highlightTokens.getCharCount(), sourceString.length(), color);
         }
         mCodeEditText.updateHighlightTokens(highlightTokens);
     }
diff --git a/app/src/main/java/com/stardust/scriptdroid/ui/settings/AboutActivity.java b/app/src/main/java/com/stardust/scriptdroid/ui/settings/AboutActivity.java
index 691e79c8..997e7108 100644
--- a/app/src/main/java/com/stardust/scriptdroid/ui/settings/AboutActivity.java
+++ b/app/src/main/java/com/stardust/scriptdroid/ui/settings/AboutActivity.java
@@ -76,9 +76,10 @@ public class AboutActivity extends BaseActivity {
     @Click(R.id.icon)
     void lol() {
         mLolClickCount++;
-        Toast.makeText(this, R.string.text_lll, Toast.LENGTH_LONG).show();
+        //Toast.makeText(this, R.string.text_lll, Toast.LENGTH_LONG).show();
         if (mLolClickCount >= 5) {
-            crashTest();
+            //crashTest();
+            showEasterEgg();
         }
     }
 
@@ -92,11 +93,8 @@ public class AboutActivity extends BaseActivity {
         new ThemeColorMaterialDialogBuilder(this)
                 .title("Crash Test")
                 .positiveText("Crash")
-                .onPositive(new MaterialDialog.SingleButtonCallback() {
-                    @Override
-                    public void onClick(@NonNull MaterialDialog dialog, @NonNull DialogAction which) {
-                        throw new RuntimeException("Crash Test");
-                    }
+                .onPositive((dialog, which) -> {
+                    throw new RuntimeException("Crash Test");
                 }).show();
     }
 
diff --git a/app/src/main/java/com/stardust/scriptdroid/ui/settings/PaintView.java b/app/src/main/java/com/stardust/scriptdroid/ui/settings/PaintView.java
deleted file mode 100644
index eeea6a93..00000000
--- a/app/src/main/java/com/stardust/scriptdroid/ui/settings/PaintView.java
+++ /dev/null
@@ -1,106 +0,0 @@
-package com.stardust.scriptdroid.ui.settings;
-
-import android.content.Context;
-import android.graphics.Canvas;
-import android.graphics.Color;
-import android.graphics.Paint;
-import android.graphics.Path;
-import android.os.Build;
-import android.support.annotation.Nullable;
-import android.support.annotation.RequiresApi;
-import android.util.AttributeSet;
-import android.view.MotionEvent;
-import android.view.View;
-
-import com.stardust.theme.ThemeColorManagerCompat;
-
-import java.util.ArrayList;
-import java.util.List;
-
-/**
- * Created by Stardust on 2017/5/10.
- */
-
-public class PaintView extends View {
-
-    private List<Path> mPaths = new ArrayList<>();
-    private Path mCurrentPath;
-    private Paint mPaint;
-
-    public PaintView(Context context) {
-        super(context);
-        init();
-    }
-
-    public PaintView(Context context, @Nullable AttributeSet attrs) {
-        super(context, attrs);
-        init();
-    }
-
-    public PaintView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
-        super(context, attrs, defStyleAttr);
-        init();
-    }
-
-    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
-    public PaintView(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
-        super(context, attrs, defStyleAttr, defStyleRes);
-        init();
-    }
-
-    private void init() {
-        mPaint = new Paint();
-        mPaint.setColor(ThemeColorManagerCompat.getColorPrimary());
-        mPaint.setAntiAlias(true);
-        mPaint.setStrokeWidth(5);
-        setWillNotDraw(false);
-        setClickable(true);
-        setBackgroundColor(Color.TRANSPARENT);
-    }
-
-    @Override
-    protected void onDraw(Canvas canvas) {
-        for (Path path : mPaths) {
-            canvas.drawPath(path, mPaint);
-        }
-    }
-
-    @Override
-    public boolean onTouchEvent(MotionEvent event) {
-        float x = event.getY();
-        float y = event.getY();
-        switch (event.getAction()) {
-            case MotionEvent.ACTION_DOWN:
-                onTouchDown(x, y);
-                return true;
-            case MotionEvent.ACTION_MOVE:
-                onTouchMove(x, y);
-                return true;
-            case MotionEvent.ACTION_UP:
-                onTouchUp(x, y);
-                return true;
-        }
-        return super.onTouchEvent(event);
-    }
-
-    private void onTouchDown(float x, float y) {
-        if (mCurrentPath != null) {
-            mCurrentPath.close();
-            mPaths.add(mCurrentPath);
-            invalidate();
-        }
-        mCurrentPath = new Path();
-        mCurrentPath.moveTo(x, y);
-    }
-
-    private void onTouchMove(float x, float y) {
-        mCurrentPath.moveTo(x, y);
-    }
-
-    private void onTouchUp(float x, float y) {
-        mCurrentPath.close();
-        mPaths.add(mCurrentPath);
-        mCurrentPath = null;
-        invalidate();
-    }
-}
diff --git a/app/src/main/java/com/stardust/scriptdroid/ui/settings/TestSurfaceView.java b/app/src/main/java/com/stardust/scriptdroid/ui/settings/TestSurfaceView.java
new file mode 100644
index 00000000..d926d56a
--- /dev/null
+++ b/app/src/main/java/com/stardust/scriptdroid/ui/settings/TestSurfaceView.java
@@ -0,0 +1,88 @@
+package com.stardust.scriptdroid.ui.settings;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * Created by Stardust on 2018/3/16.
+ */
+
+public class TestSurfaceView extends SurfaceView implements SurfaceHolder.Callback {
+
+    private volatile boolean mDrawing = true;
+    private static final String LOG_TAG = "TestSurfaceView";
+    private ExecutorService mDrawingThreadPool;
+
+    public TestSurfaceView(Context context) {
+        super(context);
+        init();
+    }
+
+    public TestSurfaceView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init();
+    }
+
+    public TestSurfaceView(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        init();
+    }
+
+    private void init() {
+        getHolder().addCallback(this);
+    }
+
+    @Override
+    public void surfaceCreated(SurfaceHolder holder) {
+        performDraw();
+    }
+
+    @Override
+    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
+
+    }
+
+    private void performDraw() {
+        if (mDrawingThreadPool == null)
+            mDrawingThreadPool = Executors.newCachedThreadPool();
+        mDrawingThreadPool.execute(() -> {
+            SurfaceHolder holder = getHolder();
+            while (mDrawing) {
+                Canvas canvas = holder.lockCanvas();
+                canvas.drawColor(Color.RED);
+                holder.unlockCanvasAndPost(canvas);
+            }
+            Log.d(LOG_TAG, "drawing thread: mRunning = false");
+        });
+    }
+
+    @Override
+    protected void onWindowVisibilityChanged(int visibility) {
+        if (visibility == VISIBLE) {
+            if (mDrawingThreadPool != null) {
+                mDrawing = true;
+                performDraw();
+            }
+        } else {
+            mDrawing = false;
+        }
+        super.onWindowVisibilityChanged(visibility);
+    }
+
+    @Override
+    public void surfaceDestroyed(SurfaceHolder holder) {
+        Log.d(LOG_TAG, "surfaceDestroyed: mRunning = true");
+        mDrawing = false;
+        Log.d(LOG_TAG, "surfaceDestroyed: mRunning = false");
+        mDrawingThreadPool.shutdown();
+        mDrawingThreadPool = null;
+    }
+}
diff --git a/app/src/main/res/layout/paint_layout.xml b/app/src/main/res/layout/paint_layout.xml
index de6ce787..b64b4f46 100644
--- a/app/src/main/res/layout/paint_layout.xml
+++ b/app/src/main/res/layout/paint_layout.xml
@@ -3,14 +3,7 @@
              android:layout_width="600dp"
              android:layout_height="600dp">
 
-    <ImageView
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:layout_gravity="center"
-        android:padding="200dp"
-        android:src="@drawable/ic_android_eat_js"/>
-
-    <com.stardust.scriptdroid.ui.settings.PaintView
+    <com.stardust.scriptdroid.ui.settings.TestSurfaceView
         android:layout_width="match_parent"
         android:layout_height="match_parent"/>
 
diff --git a/autojs/src/main/AndroidManifest.xml b/autojs/src/main/AndroidManifest.xml
index 4089509f..3a3ba863 100644
--- a/autojs/src/main/AndroidManifest.xml
+++ b/autojs/src/main/AndroidManifest.xml
@@ -13,6 +13,7 @@
         >
         <activity
             android:name=".execution.ScriptExecuteActivity"
+            android:configChanges="keyboardHidden|orientation|screenSize"
             android:theme="@style/AppTheme"/>
 
 
diff --git a/autojs/src/main/assets/init.js b/autojs/src/main/assets/init.js
index 33e59f94..7f76ccb3 100644
--- a/autojs/src/main/assets/init.js
+++ b/autojs/src/main/assets/init.js
@@ -96,12 +96,15 @@ runtime.init();
 
     importClass(android.view.KeyEvent);
     importClass(com.stardust.autojs.core.util.Shell);
+    importClass(android.graphics.Paint);
 
     //重定向require以便支持相对路径
     (function(){
         var __require__ = require;
         global.require = function(path){
-            path = files.path(path);
+            if(!path.startsWith("http://") && !path.startsWith("https://")){
+               path = files.path(path);
+            }
             return __require__(path);
         };
     })();
diff --git a/autojs/src/main/java/com/stardust/autojs/core/eventloop/EventEmitter.java b/autojs/src/main/java/com/stardust/autojs/core/eventloop/EventEmitter.java
index 7d6262e0..35d9a385 100644
--- a/autojs/src/main/java/com/stardust/autojs/core/eventloop/EventEmitter.java
+++ b/autojs/src/main/java/com/stardust/autojs/core/eventloop/EventEmitter.java
@@ -110,6 +110,10 @@ public class EventEmitter {
         mBridges = bridges;
     }
 
+    protected void setTimer(Timer timer) {
+        mTimer = timer;
+    }
+
     public EventEmitter once(String eventName, Object listener) {
         getListeners(eventName).add(listener, true);
         return this;
diff --git a/autojs/src/main/java/com/stardust/autojs/core/graphics/ScriptCanvasView.java b/autojs/src/main/java/com/stardust/autojs/core/graphics/ScriptCanvasView.java
new file mode 100644
index 00000000..42b80112
--- /dev/null
+++ b/autojs/src/main/java/com/stardust/autojs/core/graphics/ScriptCanvasView.java
@@ -0,0 +1,148 @@
+package com.stardust.autojs.core.graphics;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.util.Log;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+
+import com.stardust.autojs.core.eventloop.EventEmitter;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * Created by Stardust on 2018/3/16.
+ */
+
+@SuppressLint("ViewConstructor")
+public class ScriptCanvasView extends SurfaceView implements SurfaceHolder.Callback {
+
+    private static final String LOG_TAG = "ScriptCanvasView";
+    private volatile boolean mDrawing = true;
+    private EventEmitter mEventEmitter;
+    private final SurfaceHolder mHolder;
+    private ExecutorService mDrawingThreadPool;
+
+
+    public ScriptCanvasView(Context context, EventEmitter eventEmitter) {
+        super(context);
+        mEventEmitter = eventEmitter;
+        mHolder = getHolder();
+        init();
+    }
+
+    private void init() {
+        mHolder.addCallback(this);
+    }
+
+    @Override
+    public void surfaceCreated(SurfaceHolder holder) {
+        performDraw();
+    }
+
+    @Override
+    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
+
+    }
+
+    private void performDraw() {
+        if (mDrawingThreadPool == null)
+            mDrawingThreadPool = Executors.newCachedThreadPool();
+        mDrawingThreadPool.execute(() -> {
+            SurfaceHolder holder = getHolder();
+            while (mDrawing) {
+                Canvas canvas = holder.lockCanvas();
+                canvas.drawColor(Color.WHITE);
+                emit("draw", canvas, this);
+                holder.unlockCanvasAndPost(canvas);
+            }
+            Log.d(LOG_TAG, "drawing thread: mRunning = false");
+        });
+    }
+
+    @Override
+    protected void onWindowVisibilityChanged(int visibility) {
+        if (visibility == VISIBLE) {
+            if (mDrawingThreadPool != null) {
+                mDrawing = true;
+                performDraw();
+            }
+        } else {
+            mDrawing = false;
+        }
+        super.onWindowVisibilityChanged(visibility);
+    }
+
+    @Override
+    public void surfaceDestroyed(SurfaceHolder holder) {
+        Log.d(LOG_TAG, "surfaceDestroyed: mRunning = true");
+        mDrawing = false;
+        Log.d(LOG_TAG, "surfaceDestroyed: mRunning = false");
+        mDrawingThreadPool.shutdown();
+        mDrawingThreadPool = null;
+    }
+
+    public EventEmitter once(String eventName, Object listener) {
+        return mEventEmitter.once(eventName, listener);
+    }
+
+    public EventEmitter on(String eventName, Object listener) {
+        return mEventEmitter.on(eventName, listener);
+    }
+
+    public EventEmitter addListener(String eventName, Object listener) {
+        return mEventEmitter.addListener(eventName, listener);
+    }
+
+    public boolean emit(String eventName, Object... args) {
+        return mEventEmitter.emit(eventName, args);
+    }
+
+    public String[] eventNames() {
+        return mEventEmitter.eventNames();
+    }
+
+    public int listenerCount(String eventName) {
+        return mEventEmitter.listenerCount(eventName);
+    }
+
+    public Object[] listeners(String eventName) {
+        return mEventEmitter.listeners(eventName);
+    }
+
+    public EventEmitter prependListener(String eventName, Object listener) {
+        return mEventEmitter.prependListener(eventName, listener);
+    }
+
+    public EventEmitter prependOnceListener(String eventName, Object listener) {
+        return mEventEmitter.prependOnceListener(eventName, listener);
+    }
+
+    public EventEmitter removeAllListeners() {
+        return mEventEmitter.removeAllListeners();
+    }
+
+    public EventEmitter removeAllListeners(String eventName) {
+        return mEventEmitter.removeAllListeners(eventName);
+    }
+
+    public EventEmitter removeListener(String eventName, Object listener) {
+        return mEventEmitter.removeListener(eventName, listener);
+    }
+
+    public EventEmitter setMaxListeners(int n) {
+        return mEventEmitter.setMaxListeners(n);
+    }
+
+    public int getMaxListeners() {
+        return mEventEmitter.getMaxListeners();
+    }
+
+    public static int defaultMaxListeners() {
+        return EventEmitter.defaultMaxListeners();
+    }
+
+}
diff --git a/autojs/src/main/java/com/stardust/autojs/core/looper/LooperHelper.java b/autojs/src/main/java/com/stardust/autojs/core/looper/LooperHelper.java
index 5bb2857a..40e329e6 100644
--- a/autojs/src/main/java/com/stardust/autojs/core/looper/LooperHelper.java
+++ b/autojs/src/main/java/com/stardust/autojs/core/looper/LooperHelper.java
@@ -24,7 +24,7 @@ public class LooperHelper {
 
     public static void quitForThread(Thread thread) {
         Looper looper = sLoopers.remove(thread);
-        if (looper != null)
+        if (looper != null && looper != Looper.getMainLooper())
             looper.quit();
     }
 }
diff --git a/autojs/src/main/java/com/stardust/autojs/core/looper/TimerThread.java b/autojs/src/main/java/com/stardust/autojs/core/looper/TimerThread.java
index 7fe88314..71a75086 100644
--- a/autojs/src/main/java/com/stardust/autojs/core/looper/TimerThread.java
+++ b/autojs/src/main/java/com/stardust/autojs/core/looper/TimerThread.java
@@ -87,7 +87,7 @@ public class TimerThread extends ThreadCompat {
         return getTimer().setTimeout(callback, delay, args);
     }
 
-    private Timer getTimer() {
+    public Timer getTimer() {
         if (mTimer == null) {
             throw new IllegalStateException("thread is not alive");
         }
diff --git a/autojs/src/main/java/com/stardust/autojs/core/ui/inflater/DynamicLayoutInflater.java b/autojs/src/main/java/com/stardust/autojs/core/ui/inflater/DynamicLayoutInflater.java
index 749ca140..6e5bad88 100644
--- a/autojs/src/main/java/com/stardust/autojs/core/ui/inflater/DynamicLayoutInflater.java
+++ b/autojs/src/main/java/com/stardust/autojs/core/ui/inflater/DynamicLayoutInflater.java
@@ -49,30 +49,7 @@ import java.util.Map;
 import javax.xml.parsers.DocumentBuilder;
 import javax.xml.parsers.DocumentBuilderFactory;
 
-/**
- * Copyright Nicholas White 2015.
- * Source: https://github.com/nickwah/DynamicLayoutInflator
- * <p>
- * Licensed under the MIT License:
- * <p>
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- * <p>
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- * <p>
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
+
 public class DynamicLayoutInflater {
     private static final String LOG_TAG = "DynamicLayoutInflater";
 
diff --git a/autojs/src/main/java/com/stardust/autojs/core/ui/inflater/attrsetter/CanvasViewAttrSetter.java b/autojs/src/main/java/com/stardust/autojs/core/ui/inflater/attrsetter/CanvasViewAttrSetter.java
new file mode 100644
index 00000000..bfe27d58
--- /dev/null
+++ b/autojs/src/main/java/com/stardust/autojs/core/ui/inflater/attrsetter/CanvasViewAttrSetter.java
@@ -0,0 +1,32 @@
+package com.stardust.autojs.core.ui.inflater.attrsetter;
+
+import android.content.Context;
+import android.support.annotation.Nullable;
+
+import com.stardust.autojs.core.eventloop.EventEmitter;
+import com.stardust.autojs.core.graphics.ScriptCanvasView;
+import com.stardust.autojs.core.ui.inflater.ValueParser;
+import com.stardust.autojs.core.ui.inflater.ViewCreator;
+import com.stardust.autojs.runtime.ScriptRuntime;
+
+import java.util.Map;
+
+/**
+ * Created by Stardust on 2018/3/16.
+ */
+
+public class CanvasViewAttrSetter extends BaseViewAttrSetter<ScriptCanvasView> {
+
+    private ScriptRuntime mScriptRuntime;
+
+    public CanvasViewAttrSetter(ValueParser valueParser, ScriptRuntime runtime) {
+        super(valueParser);
+        mScriptRuntime = runtime;
+    }
+
+    @Nullable
+    @Override
+    public ViewCreator<ScriptCanvasView> getCreator() {
+        return (context, attrs) -> new ScriptCanvasView(context, new EventEmitter(mScriptRuntime.bridges));
+    }
+}
diff --git a/autojs/src/main/java/com/stardust/autojs/core/ui/xml/XmlConverter.java b/autojs/src/main/java/com/stardust/autojs/core/ui/xml/XmlConverter.java
index 4094810b..609386e2 100644
--- a/autojs/src/main/java/com/stardust/autojs/core/ui/xml/XmlConverter.java
+++ b/autojs/src/main/java/com/stardust/autojs/core/ui/xml/XmlConverter.java
@@ -12,6 +12,7 @@ import android.widget.SeekBar;
 import android.widget.Spinner;
 import android.widget.TimePicker;
 
+import com.stardust.autojs.core.graphics.ScriptCanvasView;
 import com.stardust.autojs.core.ui.widget.JsButton;
 import com.stardust.autojs.core.ui.widget.JsEditText;
 import com.stardust.autojs.core.ui.widget.JsFrameLayout;
@@ -64,6 +65,7 @@ public class XmlConverter {
                     .map("checkbox", CheckBox.class.getName())
                     .map("scroll", ScrollView.class.getName())
                     .map("toolbar", Toolbar.class.getName())
+                    .map("canvas", ScriptCanvasView.class.getName())
             );
 
     private static final AttributeHandler ATTRIBUTE_HANDLER = new AttributeHandler.AttrNameRouter()
diff --git a/autojs/src/main/java/com/stardust/autojs/engine/RhinoJavaScriptEngine.java b/autojs/src/main/java/com/stardust/autojs/engine/RhinoJavaScriptEngine.java
index d7bea965..c8033020 100644
--- a/autojs/src/main/java/com/stardust/autojs/engine/RhinoJavaScriptEngine.java
+++ b/autojs/src/main/java/com/stardust/autojs/engine/RhinoJavaScriptEngine.java
@@ -44,7 +44,6 @@ public class RhinoJavaScriptEngine extends JavaScriptEngine {
     private Scriptable mScriptable;
     private Thread mThread;
     private android.content.Context mAndroidContext;
-    private Thread.UncaughtExceptionHandler mUncaughtExceptionHandler;
 
     public RhinoJavaScriptEngine(android.content.Context context) {
         mAndroidContext = context;
@@ -157,14 +156,6 @@ public class RhinoJavaScriptEngine extends JavaScriptEngine {
         context.setWrapFactory(new WrapFactory());
     }
 
-    public void setUncaughtExceptionHandler(Thread.UncaughtExceptionHandler uiThreadExceptionHandler) {
-        mUncaughtExceptionHandler = uiThreadExceptionHandler;
-    }
-
-    public Thread.UncaughtExceptionHandler getUncaughtExceptionHandler() {
-        return mUncaughtExceptionHandler;
-    }
-
     private class WrapFactory extends org.mozilla.javascript.WrapFactory {
 
         @Override
@@ -208,7 +199,7 @@ public class RhinoJavaScriptEngine extends JavaScriptEngine {
                 try {
                     return super.doTopCall(callable, cx, scope, thisObj, args);
                 } catch (Exception e) {
-                    mUncaughtExceptionHandler.uncaughtException(Thread.currentThread(), e);
+                    getRuntime().exit(e);
                     return null;
                 }
             }
diff --git a/autojs/src/main/java/com/stardust/autojs/engine/ScriptEngine.java b/autojs/src/main/java/com/stardust/autojs/engine/ScriptEngine.java
index f40688d7..010a304e 100644
--- a/autojs/src/main/java/com/stardust/autojs/engine/ScriptEngine.java
+++ b/autojs/src/main/java/com/stardust/autojs/engine/ScriptEngine.java
@@ -40,6 +40,13 @@ public interface ScriptEngine<S extends ScriptSource> {
 
     Object getTag(String key);
 
+    String cwd();
+
+    void uncaughtException(Exception throwable);
+
+    Exception getUncaughtException();
+
+
     /**
      * @hide
      */
@@ -60,11 +67,12 @@ public interface ScriptEngine<S extends ScriptSource> {
         private Map<String, Object> mTags = new ConcurrentHashMap<>();
         private OnDestroyListener mOnDestroyListener;
         private boolean mDestroyed = false;
+        private Exception mUncaughtException;
 
 
         @Override
         public synchronized void setTag(String key, Object value) {
-            if(value == null)
+            if (value == null)
                 return;
             mTags.put(key, value);
         }
@@ -97,5 +105,16 @@ public interface ScriptEngine<S extends ScriptSource> {
                 throw new SecurityException("setOnDestroyListener can be called only once");
             mOnDestroyListener = onDestroyListener;
         }
+
+        @Override
+        public void uncaughtException(Exception throwable) {
+            mUncaughtException = throwable;
+            forceStop();
+        }
+
+        @Override
+        public Exception getUncaughtException() {
+            return mUncaughtException;
+        }
     }
 }
diff --git a/autojs/src/main/java/com/stardust/autojs/engine/ScriptEngineProxy.java b/autojs/src/main/java/com/stardust/autojs/engine/ScriptEngineProxy.java
new file mode 100644
index 00000000..a295662b
--- /dev/null
+++ b/autojs/src/main/java/com/stardust/autojs/engine/ScriptEngineProxy.java
@@ -0,0 +1,76 @@
+package com.stardust.autojs.engine;
+
+import com.stardust.autojs.script.ScriptSource;
+
+/**
+ * Created by Stardust on 2018/3/17.
+ */
+
+public class ScriptEngineProxy<S extends ScriptSource> implements ScriptEngine<S> {
+
+    private final ScriptEngine<S> mScriptEngine;
+
+    public ScriptEngineProxy(ScriptEngine<S> scriptEngine) {
+        mScriptEngine = scriptEngine;
+    }
+
+    @Override
+    public void put(String name, Object value) {
+        mScriptEngine.put(name, value);
+    }
+
+    @Override
+    public Object execute(S scriptSource) {
+        return mScriptEngine.execute(scriptSource);
+    }
+
+    @Override
+    public void forceStop() {
+        mScriptEngine.forceStop();
+    }
+
+    @Override
+    public void destroy() {
+        mScriptEngine.destroy();
+    }
+
+    @Override
+    public boolean isDestroyed() {
+        return mScriptEngine.isDestroyed();
+    }
+
+    @Override
+    public void setTag(String key, Object value) {
+        mScriptEngine.setTag(key, value);
+    }
+
+    @Override
+    public Object getTag(String key) {
+        return mScriptEngine.getTag(key);
+    }
+
+    @Override
+    public String cwd() {
+        return mScriptEngine.cwd();
+    }
+
+    @Override
+    public void uncaughtException(Exception throwable) {
+        mScriptEngine.uncaughtException(throwable);
+    }
+
+    @Override
+    public Exception getUncaughtException() {
+        return mScriptEngine.getUncaughtException();
+    }
+
+    @Override
+    public void setOnDestroyListener(OnDestroyListener listener) {
+        mScriptEngine.setOnDestroyListener(listener);
+    }
+
+    @Override
+    public void init() {
+        mScriptEngine.init();
+    }
+}
diff --git a/autojs/src/main/java/com/stardust/autojs/execution/LoopedBasedJavaScriptExecution.java b/autojs/src/main/java/com/stardust/autojs/execution/LoopedBasedJavaScriptExecution.java
index 4e643022..dc8f4894 100644
--- a/autojs/src/main/java/com/stardust/autojs/execution/LoopedBasedJavaScriptExecution.java
+++ b/autojs/src/main/java/com/stardust/autojs/execution/LoopedBasedJavaScriptExecution.java
@@ -23,10 +23,6 @@ public class LoopedBasedJavaScriptExecution extends RunnableScriptExecution {
         long delay = getConfig().delay;
         sleep(delay);
         final LoopBasedJavaScriptEngine javaScriptEngine = (LoopBasedJavaScriptEngine) engine;
-        javaScriptEngine.setUncaughtExceptionHandler((t, e) -> {
-            javaScriptEngine.forceStop();
-            getListener().onException(this, (Exception) e);
-        });
         final long interval = getConfig().interval;
         javaScriptEngine.getRuntime().loopers.setMainLooperQuitHandler(new Loopers.LooperQuitHandler() {
             long times = getConfig().loopTimes == 0 ? Integer.MAX_VALUE : getConfig().loopTimes;
diff --git a/autojs/src/main/java/com/stardust/autojs/execution/ScriptExecuteActivity.java b/autojs/src/main/java/com/stardust/autojs/execution/ScriptExecuteActivity.java
index 9e8e43e7..ca5187e2 100644
--- a/autojs/src/main/java/com/stardust/autojs/execution/ScriptExecuteActivity.java
+++ b/autojs/src/main/java/com/stardust/autojs/execution/ScriptExecuteActivity.java
@@ -1,5 +1,6 @@
 package com.stardust.autojs.execution;
 
+import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
@@ -9,6 +10,7 @@ import com.stardust.autojs.engine.LoopBasedJavaScriptEngine;
 import com.stardust.autojs.engine.RhinoJavaScriptEngine;
 import com.stardust.autojs.engine.ScriptEngine;
 import com.stardust.autojs.engine.ScriptEngineManager;
+import com.stardust.autojs.engine.ScriptEngineProxy;
 import com.stardust.autojs.script.ScriptSource;
 import com.stardust.util.IntentExtras;
 
@@ -16,7 +18,7 @@ import com.stardust.util.IntentExtras;
  * Created by Stardust on 2017/2/5.
  */
 
-public class ScriptExecuteActivity extends AppCompatActivity implements Thread.UncaughtExceptionHandler {
+public class ScriptExecuteActivity extends AppCompatActivity {
 
 
     private static final String EXTRA_EXECUTION = ScriptExecuteActivity.class.getName() + ".execution";
@@ -24,7 +26,8 @@ public class ScriptExecuteActivity extends AppCompatActivity implements Thread.U
     private ScriptEngine mScriptEngine;
     private ScriptExecutionListener mExecutionListener;
     private ScriptSource mScriptSource;
-    private ScriptExecution mScriptExecution;
+    private ActivityScriptExecution mScriptExecution;
+    private IntentExtras mIntentExtras;
 
     public static ActivityScriptExecution execute(Context context, ScriptEngineManager manager, ScriptExecutionTask task) {
         ActivityScriptExecution execution = new ActivityScriptExecution(manager, task);
@@ -37,22 +40,34 @@ public class ScriptExecuteActivity extends AppCompatActivity implements Thread.U
         return execution;
     }
 
+    // FIXME: 2018/3/16 如果Activity被回收则得不到改进
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        IntentExtras extras = IntentExtras.fromIntent(getIntent());
-        if (extras.get(EXTRA_EXECUTION) == null) {
+        mIntentExtras = readIntentExtras(savedInstanceState);
+        if (mIntentExtras == null || mIntentExtras.get(EXTRA_EXECUTION) == null) {
             finish();
             return;
         }
-        mScriptExecution = extras.get(EXTRA_EXECUTION);
+        mScriptExecution = mIntentExtras.get(EXTRA_EXECUTION);
         mScriptSource = mScriptExecution.getSource();
-        mScriptEngine = mScriptExecution.getEngine();
+        mScriptEngine = mScriptExecution.createEngine(this);
         mExecutionListener = mScriptExecution.getListener();
-        ((RhinoJavaScriptEngine) mScriptEngine).setUncaughtExceptionHandler((t, e) -> onException((Exception) e));
         runScript();
     }
 
+    private IntentExtras readIntentExtras(Bundle savedInstanceState) {
+        IntentExtras extras = IntentExtras.fromIntent(getIntent());
+        if (extras == null && savedInstanceState != null) {
+            int id = savedInstanceState.getInt(IntentExtras.EXTRA_ID, -1);
+            if (id == -1) {
+                return null;
+            }
+            extras = IntentExtras.fromId(id);
+        }
+        return extras;
+    }
+
     private void runScript() {
         try {
             prepare();
@@ -93,7 +108,12 @@ public class ScriptExecuteActivity extends AppCompatActivity implements Thread.U
 
     @Override
     public void finish() {
-        mExecutionListener.onSuccess(mScriptExecution, mResult);
+        Exception exception = mScriptEngine.getUncaughtException();
+        if (exception != null) {
+            onException(exception);
+        } else {
+            mExecutionListener.onSuccess(mScriptExecution, mResult);
+        }
         super.finish();
     }
 
@@ -106,8 +126,12 @@ public class ScriptExecuteActivity extends AppCompatActivity implements Thread.U
     }
 
     @Override
-    public void uncaughtException(Thread t, Throwable e) {
-        onException((Exception) e);
+    protected void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        if (mIntentExtras == null)
+            return;
+        IntentExtras extras = IntentExtras.newExtras().putAll(mIntentExtras);
+        outState.putInt(IntentExtras.EXTRA_ID, extras.getId());
     }
 
     private static class ActivityScriptExecution extends ScriptExecution.AbstractScriptExecution {
@@ -120,12 +144,23 @@ public class ScriptExecuteActivity extends AppCompatActivity implements Thread.U
             mScriptEngineManager = manager;
         }
 
+        @SuppressWarnings("unchecked")
+        public ScriptEngine createEngine(Activity activity) {
+            if (mScriptEngine != null) {
+                mScriptEngine.forceStop();
+            }
+            mScriptEngine = new ScriptEngineProxy(mScriptEngineManager.createEngineOfSourceOrThrow(getSource())) {
+                @Override
+                public void forceStop() {
+                    super.forceStop();
+                    activity.finish();
+                }
+            };
+            return mScriptEngine;
+        }
 
         @Override
         public ScriptEngine getEngine() {
-            if (mScriptEngine == null) {
-                mScriptEngine = mScriptEngineManager.createEngineOfSourceOrThrow(getSource());
-            }
             return mScriptEngine;
         }
 
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 f70a3ed3..9dadf40f 100644
--- a/autojs/src/main/java/com/stardust/autojs/runtime/ScriptRuntime.java
+++ b/autojs/src/main/java/com/stardust/autojs/runtime/ScriptRuntime.java
@@ -9,6 +9,7 @@ import com.stardust.autojs.ScriptEngineService;
 import com.stardust.autojs.annotation.ScriptVariable;
 import com.stardust.autojs.core.accessibility.AccessibilityBridge;
 import com.stardust.autojs.core.image.Colors;
+import com.stardust.autojs.engine.JavaScriptEngine;
 import com.stardust.autojs.engine.RhinoJavaScriptEngine;
 import com.stardust.autojs.engine.ScriptEngine;
 import com.stardust.autojs.rhino.AndroidClassLoader;
@@ -321,22 +322,10 @@ public class ScriptRuntime {
         }
     }
 
-    public void exit(Object obj) throws Throwable {
-        mThread.interrupt();
-        if (!(obj instanceof Throwable)) {
-            console.error(obj);
-            return;
-        }
-        Throwable e = (Exception) obj;
+    public void exit(Exception e) {
+        engines.myEngine().uncaughtException(e);
         if (Looper.myLooper() != Looper.getMainLooper()) {
-            throw e;
-        } else {
-            Thread.UncaughtExceptionHandler handler = ((RhinoJavaScriptEngine) engines.myEngine()).getUncaughtExceptionHandler();
-            if (handler != null) {
-                handler.uncaughtException(Thread.currentThread(), e);
-            } else {
-                console.error(e);
-            }
+            throw new ScriptException(e);
         }
     }
 
diff --git a/autojs/src/main/java/com/stardust/autojs/runtime/api/Files.java b/autojs/src/main/java/com/stardust/autojs/runtime/api/Files.java
index 0f71e23e..0cf659d5 100644
--- a/autojs/src/main/java/com/stardust/autojs/runtime/api/Files.java
+++ b/autojs/src/main/java/com/stardust/autojs/runtime/api/Files.java
@@ -39,7 +39,7 @@ public class Files {
     }
 
     public String cwd() {
-        return ((ScriptEngine.AbstractScriptEngine) mRuntime.engines.myEngine()).cwd();
+        return mRuntime.engines.myEngine().cwd();
     }
 
     public PFileInterface open(String path, String mode, String encoding, int bufferSize) {
diff --git a/autojs/src/main/java/com/stardust/autojs/runtime/api/UI.java b/autojs/src/main/java/com/stardust/autojs/runtime/api/UI.java
index eb937e78..06dfaaff 100644
--- a/autojs/src/main/java/com/stardust/autojs/runtime/api/UI.java
+++ b/autojs/src/main/java/com/stardust/autojs/runtime/api/UI.java
@@ -3,10 +3,12 @@ package com.stardust.autojs.runtime.api;
 import android.content.Context;
 import android.graphics.drawable.Drawable;
 
+import com.stardust.autojs.core.graphics.ScriptCanvasView;
 import com.stardust.autojs.core.ui.ConvertLayoutInflater;
 import com.stardust.autojs.core.ui.JsLayoutInflater;
 import com.stardust.autojs.core.ui.inflater.DynamicLayoutInflater;
 import com.stardust.autojs.core.ui.inflater.ValueParser;
+import com.stardust.autojs.core.ui.inflater.attrsetter.CanvasViewAttrSetter;
 import com.stardust.autojs.core.ui.inflater.attrsetter.JsImageViewAttrSetter;
 import com.stardust.autojs.core.ui.widget.JsImageView;
 import com.stardust.autojs.rhino.ProxyObject;
@@ -38,6 +40,8 @@ public class UI extends ProxyObject {
         DynamicLayoutInflater inflater = new DynamicLayoutInflater(mValueParser);
         inflater.registerViewAttrSetter(JsImageView.class.getName(),
                 new JsImageViewAttrSetter(mValueParser));
+        inflater.registerViewAttrSetter(ScriptCanvasView.class.getName(),
+                new CanvasViewAttrSetter(mValueParser, runtime));
         mJsLayoutInflater = new ConvertLayoutInflater(inflater);
         mProperties.put("layoutInflater", mJsLayoutInflater);
     }
diff --git a/common/src/main/java/com/stardust/util/DeveloperUtils.java b/common/src/main/java/com/stardust/util/DeveloperUtils.java
index 2b62cf85..e9267caa 100644
--- a/common/src/main/java/com/stardust/util/DeveloperUtils.java
+++ b/common/src/main/java/com/stardust/util/DeveloperUtils.java
@@ -167,10 +167,10 @@ public class DeveloperUtils {
                     a.finish();
                     return;
                 }
-                long[] crc = readCrc(a.getString(crcRes));
-                if (!checkDexFile(a, crc)) {
-                  a.finish();
-                }
+                //long[] crc = readCrc(a.getString(crcRes));
+                //if (!checkDexFile(a, crc)) {
+                //a.finish();
+                //}
 
             }
         });
diff --git a/common/src/main/java/com/stardust/util/IntentExtras.java b/common/src/main/java/com/stardust/util/IntentExtras.java
index 7f987804..5c680857 100644
--- a/common/src/main/java/com/stardust/util/IntentExtras.java
+++ b/common/src/main/java/com/stardust/util/IntentExtras.java
@@ -14,8 +14,9 @@ import java.util.concurrent.atomic.AtomicInteger;
 
 public class IntentExtras implements Serializable {
 
+    public static final String EXTRA_ID = "com.stardust.util.IntentExtras.id";
+
     private static AtomicInteger mMaxId = new AtomicInteger(-1);
-    private static final String EXTRA_ID = "com.stardust.util.IntentExtras.id";
     private static SparseArray<Map<String, Object>> extraStore = new SparseArray<>();
 
 
@@ -26,9 +27,18 @@ public class IntentExtras implements Serializable {
     public static IntentExtras fromIntent(Intent intent) {
         int id = intent.getIntExtra(EXTRA_ID, -1);
         if (id < 0) {
-            throw new IllegalArgumentException();
+            return null;
         }
-        return new IntentExtras(id);
+        return fromId(id);
+    }
+
+    public static IntentExtras fromId(int id) {
+        Map<String, Object> map = extraStore.get(id);
+        if (map == null) {
+            return null;
+        }
+        extraStore.remove(id);
+        return new IntentExtras(id, map);
     }
 
     private Map<String, Object> mMap;
@@ -41,15 +51,14 @@ public class IntentExtras implements Serializable {
     }
 
 
-    private IntentExtras(int id) {
+    private IntentExtras(int id, Map<String, Object> map) {
         mId = id;
-        mMap = extraStore.get(id);
-        if (mMap == null) {
-            mMap = new HashMap<>();
-        }
-        extraStore.remove(id);
+        mMap = map;
     }
 
+    public int getId() {
+        return mId;
+    }
 
     @SuppressWarnings("unchecked")
     public <T> T get(String key) {
@@ -61,8 +70,15 @@ public class IntentExtras implements Serializable {
         return this;
     }
 
+    public IntentExtras putAll(IntentExtras extras) {
+        mMap.putAll(extras.mMap);
+        return this;
+    }
+
     public Intent putInIntent(Intent intent) {
         intent.putExtra(EXTRA_ID, mId);
         return intent;
     }
+
+
 }