diff --git a/app/build.gradle b/app/build.gradle
index 55db92e7..9c21e662 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -9,8 +9,8 @@ android {
         applicationId "com.stardust.scriptdroid"
         minSdkVersion 17
         targetSdkVersion 23
-        versionCode 159
-        versionName "2.0.16 Beta"
+        versionCode 160
+        versionName "2.0.16 Alpha3"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         multiDexEnabled true
         ndk {
diff --git a/app/src/main/assets/help/catalogue.json b/app/src/main/assets/help/catalogue.json
index ab01a3bd..b4d48365 100644
--- a/app/src/main/assets/help/catalogue.json
+++ b/app/src/main/assets/help/catalogue.json
@@ -69,6 +69,11 @@
       "type": "markdown",
       "path":"documentation"
     },
+    {
+      "title": "需要Root权限的触摸与多点触摸",
+      "type": "markdown",
+      "path":"documentation"
+    },
     {
       "title": "UI(用户界面)",
       "type": "markdown",
diff --git a/app/src/main/assets/help/documentation/脚本引擎.md b/app/src/main/assets/help/documentation/脚本引擎.md
index f0acfdcb..9e5872d6 100644
--- a/app/src/main/assets/help/documentation/脚本引擎.md
+++ b/app/src/main/assets/help/documentation/脚本引擎.md
@@ -41,6 +41,8 @@ engines模块包含了一些与脚本引擎有关的函数，包括运行其他
 
 停止所有正在运行的脚本并显示停止的脚本数量。包括当前脚本自身。
 
+### engines.myEngine()
+
 # ScriptExecution
 
 执行脚本时返回的对象，可以通过他获取执行的引擎、
diff --git a/app/src/main/assets/help/documentation/需要Root权限的自动操作函数.md b/app/src/main/assets/help/documentation/需要Root权限的自动操作函数.md
index d9ca0e29..15fb4bfe 100644
--- a/app/src/main/assets/help/documentation/需要Root权限的自动操作函数.md
+++ b/app/src/main/assets/help/documentation/需要Root权限的自动操作函数.md
@@ -1,9 +1,13 @@
+
+注意：本章节的函数在后续版本很可能有改动！请勿过分依赖本章节函数的副作用。推荐使用RootAutomator（见《需要Root权限的触摸与多点触摸》）代替本章的触摸函数。
+
 以下函数均需要root权限，可以实现任意位置的点击、滑动、长按、模拟物理按键等。
 
 这些函数通常首字母大写以表示其特殊的权限。  
 这些函数均不返回任何值。  
 并且，这些函数的执行是异步的、非实时的，在不同机型上所用的时间不同。脚本不会等待动作执行完成才继续执行。因此最好在每个函数之后加上适当的sleep来达到期望的效果。
 
+
 例如:
 ```
 Tap(100, 100);
diff --git a/app/src/main/assets/help/documentation/需要Root权限的触摸与多点触摸.md b/app/src/main/assets/help/documentation/需要Root权限的触摸与多点触摸.md
index 212e03de..2898bed5 100644
--- a/app/src/main/assets/help/documentation/需要Root权限的触摸与多点触摸.md
+++ b/app/src/main/assets/help/documentation/需要Root权限的触摸与多点触摸.md
@@ -10,7 +10,7 @@ var ra = RootAutomator(context);
 ### RootAutomator.tap(x, y\[, id\])
 * x \<Number\> 横坐标
 * y \<Number\> 纵坐标
-* id \<Number\> 多点触摸id。默认值为1，可以通过setDefaultId指定。
+* id \<Number\> 多点触摸id，可选，默认为1，可以通过setDefaultId指定。
 
 点击位置(x, y)。其中id是一个整数值，用于区分多点触摸，不同的id表示不同的"手指"，例如：
 ```
@@ -29,7 +29,7 @@ ra.exit();
 * x2 \<Number\> 滑动终点横坐标
 * y2 \<Number\> 滑动终点纵坐标
 * duration \<Number\> 滑动时长，单位毫秒，默认值为300
-* id \<Number\> 多点触摸id
+* id \<Number\> 多点触摸id，可选，默认为1
 
 模拟一次从(x1, y1)到(x2, y2)的时间为duration毫秒的滑动。
 
@@ -37,28 +37,36 @@ ra.exit();
 * x \<Number\> 横坐标
 * y \<Number\> 纵坐标
 * duration \<Number\> 按下时长
-* id \<Number\> 多点触摸id
+* id \<Number\> 多点触摸id，可选，默认为1
 
 模拟按下位置(x, y)，时长为duration毫秒。
 
+### RootAutomator.longPress(x, y[\, id\])
+* x \<Number\> 横坐标
+* y \<Number\> 纵坐标
+* duration \<Number\> 按下时长
+* id \<Number\> 多点触摸id，可选，默认为1
+
+模拟长按位置(x, y)。
+
 以上为简单模拟触摸操作的函数。如果要模拟一些复杂的手势，需要更底层的函数。
 
 ### RootAutomator.touchDown(x, y[\, id\])
 * x \<Number\> 横坐标
 * y \<Number\> 纵坐标
-* id \<Number\> 多点触摸id
+* id \<Number\> 多点触摸id，可选，默认为1
 
 模拟手指按下位置(x, y)。
 
 ### RootAutomator.touchMove(x, y[\, id\])
 * x \<Number\> 横坐标
 * y \<Number\> 纵坐标
-* id \<Number\> 多点触摸id
+* id \<Number\> 多点触摸id，可选，默认为1
 
 模拟移动手指到位置(x, y)。
 
-### RootAutomator.touchUp([\id\])
-* id \<Number\> 多点触摸id
+### RootAutomator.touchUp(\[id\])
+* id \<Number\> 多点触摸id，可选，默认为1
 
 模拟手指弹起。
 
diff --git a/app/src/main/assets/sample/需要Root权限的自动操作/删除全部空间留言.js b/app/src/main/assets/sample/需要Root权限的自动操作/删除全部空间留言.js
index fcd82996..4f36bedd 100644
--- a/app/src/main/assets/sample/需要Root权限的自动操作/删除全部空间留言.js
+++ b/app/src/main/assets/sample/需要Root权限的自动操作/删除全部空间留言.js
@@ -1,27 +1,28 @@
-"auto";
+var ra = new RootAutomator();
+ra.setScreenMetrics(1080, 1920);
 
-setScreenMetrics(1080, 1920);
 launchApp("QQ");
 
 sleep(1500);
 
 //点击动态图标
-Tap(891, 1851);
+ra.tap(891, 1851);
 //点击好友动态
-Tap(192, 453);
+ra.tap(192, 453);
 //点击头像
-Tap(155, 638);
+ra.tap(155, 638);
 //点击留言
-Tap(747, 775);
+ra.tap(747, 775);
 
 while(true){
     if(currentPackage() == 'com.tencent.mobileqq'){
         //点击箭头图标
-        Tap(1029, 433);
+        ra.tap(1029, 433);
         //点击删除
-        Tap(530, 820);
+        ra.tap(530, 820);
         //点击确定
-        Tap(331, 1122);
+        ra.tap(331, 1122);
     }
     sleep(200);
 }
+
diff --git a/autojs/src/main/assets/binary/root_automator b/autojs/src/main/assets/binary/root_automator
index 2fcfbcc5..4e296d14 100644
Binary files a/autojs/src/main/assets/binary/root_automator and b/autojs/src/main/assets/binary/root_automator differ
diff --git a/autojs/src/main/assets/modules/__RootAutomator__.js b/autojs/src/main/assets/modules/__RootAutomator__.js
index 31669b09..3bc1acf8 100644
--- a/autojs/src/main/assets/modules/__RootAutomator__.js
+++ b/autojs/src/main/assets/modules/__RootAutomator__.js
@@ -2,7 +2,7 @@ module.exports = function(__runtime__, scope){
     function RootAutomator(){
          this.__ra__ = Object.create(new com.stardust.autojs.runtime.api.RootAutomator(scope.context));
         var methods = ["sendEvent", "touch", "setScreenMetrics", "touchX", "touchY", "sendSync",  "sendMtSync", "tap",
-            "swipe","touchDown", "touchUp", "touchMove", "getDefaultId", "setDefaultId", "exit"];
+            "swipe", "press", "longPress", "touchDown", "touchUp", "touchMove", "getDefaultId", "setDefaultId", "exit"];
         for(var i = 0; i < methods.length; i++){
             var method = methods[i];
             this[method] = this.__ra__[method].bind(this.__ra__);
diff --git a/autojs/src/main/assets/modules/__engines__.js b/autojs/src/main/assets/modules/__engines__.js
index cd1d532e..b491308f 100644
--- a/autojs/src/main/assets/modules/__engines__.js
+++ b/autojs/src/main/assets/modules/__engines__.js
@@ -5,18 +5,19 @@ module.exports = function(__runtime__, scope){
     var engines = {};
 
     engines.execScript = function(name, script, config){
-        config = fillConfig(config);
-        return rtEngines.execScript(name, script, config);
+        return rtEngines.execScript(name, script, fillConfig(config));
     }
 
     engines.execScriptFile = function(path, config){
-        config = fillConfig(config);
-        return rtEngines.execScriptFile(path, config);
+        return rtEngines.execScriptFile(path, fillConfig(config));
     }
 
     engines.execAutoFile = function(path, config){
-        config = fillConfig(config);
-        return rtEngines.execAutoFile(path, config);
+        return rtEngines.execAutoFile(path, fillConfig(config));
+    }
+
+    engines.myEngine = function(){
+        return scope.__engine__;
     }
 
     engines.stopAll = rtEngines.stopAll.bind(rtEngines);
diff --git a/autojs/src/main/assets/modules/__general__.js b/autojs/src/main/assets/modules/__general__.js
index 94768a3f..996b6dca 100644
--- a/autojs/src/main/assets/modules/__general__.js
+++ b/autojs/src/main/assets/modules/__general__.js
@@ -45,17 +45,17 @@ module.exports = function(__runtime__, scope){
         return __runtime__.info.getLatestActivity();
     }
 
-    scope.waitForActivity = function(activity, delay){
-        delay = delay || 200;
+    scope.waitForActivity = function(activity, period){
+        period = period || 200;
         while(scope.currentActivity() != activity){
-            sleep(delay);
+            sleep(period);
         }
     }
 
-    scope.waitForPackage = function(packageName, delay){
-        delay = delay || 200;
+    scope.waitForPackage = function(packageName, period){
+        period = period || 200;
         while(scope.currentPackage() != packageName){
-            sleep(delay);
+            sleep(period);
         }
     }
 
diff --git a/autojs/src/main/java/com/stardust/autojs/core/accessibility/SimpleActionAutomator.java b/autojs/src/main/java/com/stardust/autojs/core/accessibility/SimpleActionAutomator.java
index c9c4eaca..f0ef7e52 100644
--- a/autojs/src/main/java/com/stardust/autojs/core/accessibility/SimpleActionAutomator.java
+++ b/autojs/src/main/java/com/stardust/autojs/core/accessibility/SimpleActionAutomator.java
@@ -245,6 +245,7 @@ public class SimpleActionAutomator {
         mAccessibilityBridge.ensureServiceEnabled();
     }
 
+
     @SuppressWarnings("unchecked")
     private boolean performAction(SimpleAction simpleAction) {
         ensureAccessibilityServiceEnabled();
diff --git a/autojs/src/main/java/com/stardust/autojs/engine/JavaScriptEngine.java b/autojs/src/main/java/com/stardust/autojs/engine/JavaScriptEngine.java
index 894c01f0..7b1f68a7 100644
--- a/autojs/src/main/java/com/stardust/autojs/engine/JavaScriptEngine.java
+++ b/autojs/src/main/java/com/stardust/autojs/engine/JavaScriptEngine.java
@@ -28,6 +28,9 @@ public abstract class JavaScriptEngine extends ScriptEngine.AbstractScriptEngine
     }
 
     public void setRuntime(ScriptRuntime runtime) {
+        if (mRuntime != null) {
+            throw new IllegalStateException("a runtime has been set");
+        }
         mRuntime = runtime;
         put("__runtime__", runtime);
     }
diff --git a/autojs/src/main/java/com/stardust/autojs/engine/RootAutomatorEngine.java b/autojs/src/main/java/com/stardust/autojs/engine/RootAutomatorEngine.java
index 8b5daaf2..41d78e61 100644
--- a/autojs/src/main/java/com/stardust/autojs/engine/RootAutomatorEngine.java
+++ b/autojs/src/main/java/com/stardust/autojs/engine/RootAutomatorEngine.java
@@ -7,7 +7,10 @@ import android.util.Log;
 import com.stardust.autojs.runtime.api.AbstractShell;
 import com.stardust.autojs.runtime.api.ProcessShell;
 import com.stardust.autojs.core.inputevent.InputDevices;
+import com.stardust.autojs.runtime.api.Shell;
+import com.stardust.autojs.runtime.exception.ScriptInterruptedException;
 import com.stardust.autojs.script.AutoFileSource;
+import com.stardust.concurrent.VolatileBox;
 import com.stardust.pio.PFile;
 
 import java.io.File;
@@ -34,7 +37,6 @@ public class RootAutomatorEngine extends ScriptEngine.AbstractScriptEngine<AutoF
     public RootAutomatorEngine(Context context, String deviceNameOrPath) {
         mContext = context;
         mDeviceNameOrPath = getDeviceNameOrPath(context, deviceNameOrPath);
-
     }
 
 
@@ -42,14 +44,14 @@ public class RootAutomatorEngine extends ScriptEngine.AbstractScriptEngine<AutoF
         this(context, InputDevices.getTouchDeviceName());
     }
 
-    public AbstractShell.Result execute(String autoFile) {
+    public void execute(String autoFile) {
         mExecutablePath = getExecutablePath(mContext);
-        AbstractShell.Result r = ProcessShell.execCommand(new String[]{
+        Log.d(LOG_TAG, "exec: " + autoFile);
+        AbstractShell.Result result = ProcessShell.execCommand(new String[]{
                 "chmod 777 " + mExecutablePath,
                 mExecutablePath + " \"" + autoFile + "\" -d " + mDeviceNameOrPath
         }, true);
-        Log.d(LOG_TAG, "exec: " + autoFile + " result:" + r);
-        return r;
+        Log.d(LOG_TAG, "result = " + result);
     }
 
 
@@ -90,17 +92,24 @@ public class RootAutomatorEngine extends ScriptEngine.AbstractScriptEngine<AutoF
 
     @Override
     public Object execute(AutoFileSource source) {
-        return execute(source.getFile().getAbsolutePath());
+        execute(source.getFile().getAbsolutePath());
+        return null;
     }
 
     @Override
     public void forceStop() {
-        ProcessShell.exec("killall " + mExecutablePath, true);
         mThread.interrupt();
+        ProcessShell.exec("killall " + mExecutablePath, true);
     }
 
     @Override
     public void init() {
         mThread = Thread.currentThread();
     }
+
+    @Override
+    public synchronized void destroy() {
+        super.destroy();
+        Log.d(LOG_TAG, "Shell exit");
+    }
 }
diff --git a/autojs/src/main/java/com/stardust/autojs/runtime/api/ProcessShell.java b/autojs/src/main/java/com/stardust/autojs/runtime/api/ProcessShell.java
index f156986f..6ceb6d93 100644
--- a/autojs/src/main/java/com/stardust/autojs/runtime/api/ProcessShell.java
+++ b/autojs/src/main/java/com/stardust/autojs/runtime/api/ProcessShell.java
@@ -68,6 +68,7 @@ public class ProcessShell extends AbstractShell {
     @Override
     public void exit() {
         if (mProcess != null) {
+            Log.d(TAG, "exit: pid = " + ProcessUtils.getProcessPid(mProcess));
             mProcess.destroy();
             mProcess = null;
         }
@@ -195,11 +196,14 @@ public class ProcessShell extends AbstractShell {
             }
             os.writeBytes(COMMAND_EXIT);
             os.flush();
+            Log.d(TAG, "pid = " + ProcessUtils.getProcessPid(process));
             commandResult.code = process.waitFor();
             commandResult.result = readAll(process.getInputStream());
             commandResult.error = readAll(process.getErrorStream());
             Log.d(TAG, commandResult.toString());
         } catch (Exception e) {
+            commandResult.code = -1;
+            commandResult.error = e.getMessage();
             e.printStackTrace();
         } finally {
             try {
diff --git a/autojs/src/main/java/com/stardust/autojs/runtime/api/RootAutomator.java b/autojs/src/main/java/com/stardust/autojs/runtime/api/RootAutomator.java
index 8a9ab261..aa164194 100644
--- a/autojs/src/main/java/com/stardust/autojs/runtime/api/RootAutomator.java
+++ b/autojs/src/main/java/com/stardust/autojs/runtime/api/RootAutomator.java
@@ -3,22 +3,26 @@ package com.stardust.autojs.runtime.api;
 import android.content.Context;
 import android.os.SystemClock;
 import android.support.annotation.Nullable;
-import android.util.Log;
-import android.view.InputDevice;
+import android.view.ViewConfiguration;
 
 import com.stardust.autojs.core.inputevent.InputDevices;
 import com.stardust.autojs.engine.RootAutomatorEngine;
-import com.stardust.autojs.runtime.ScriptRuntime;
 import com.stardust.autojs.runtime.exception.ScriptInterruptedException;
-import com.stardust.pio.UncheckedIOException;
 import com.stardust.util.ScreenMetrics;
 
-import java.io.DataOutputStream;
-import java.io.File;
-import java.io.FileOutputStream;
 import java.io.IOException;
 
-import static com.stardust.autojs.core.inputevent.InputEventCodes.*;
+import static com.stardust.autojs.core.inputevent.InputEventCodes.ABS_MT_POSITION_X;
+import static com.stardust.autojs.core.inputevent.InputEventCodes.ABS_MT_POSITION_Y;
+import static com.stardust.autojs.core.inputevent.InputEventCodes.ABS_MT_TOUCH_MAJOR;
+import static com.stardust.autojs.core.inputevent.InputEventCodes.ABS_MT_TRACKING_ID;
+import static com.stardust.autojs.core.inputevent.InputEventCodes.BTN_TOOL_FINGER;
+import static com.stardust.autojs.core.inputevent.InputEventCodes.BTN_TOUCH;
+import static com.stardust.autojs.core.inputevent.InputEventCodes.EV_ABS;
+import static com.stardust.autojs.core.inputevent.InputEventCodes.EV_KEY;
+import static com.stardust.autojs.core.inputevent.InputEventCodes.EV_SYN;
+import static com.stardust.autojs.core.inputevent.InputEventCodes.SYN_MT_REPORT;
+import static com.stardust.autojs.core.inputevent.InputEventCodes.SYN_REPORT;
 
 /**
  * Created by Stardust on 2017/7/16.
@@ -124,6 +128,24 @@ public class RootAutomator {
         swipe(x1, y1, x2, y2, 300, mDefaultId);
     }
 
+    public void press(int x, int y, int duration, int id) throws IOException {
+        touchDown(x, y, id);
+        sleep(duration);
+        touchUp(id);
+    }
+
+    public void press(int x, int y, int duration) throws IOException {
+        press(x, y, duration, getDefaultId());
+    }
+
+    public void longPress(int x, int y, int id) throws IOException {
+        press(x, y, ViewConfiguration.getLongPressTimeout() + 200, id);
+    }
+
+    public void longPress(int x, int y) throws IOException {
+        press(x, y, ViewConfiguration.getLongPressTimeout() + 200, getDefaultId());
+    }
+
     public void touchDown(int x, int y, int id) throws IOException {
         sendEvent(EV_ABS, ABS_MT_TRACKING_ID, id);
         sendEvent(EV_KEY, BTN_TOUCH, 0x00000001);
@@ -168,10 +190,11 @@ public class RootAutomator {
         mDefaultId = defaultId;
     }
 
-    private void sleep(long duration) {
+    private void sleep(long duration) throws IOException {
         try {
             Thread.sleep(duration);
         } catch (InterruptedException e) {
+            exit();
             throw new ScriptInterruptedException();
         }
     }
diff --git a/autojs/src/main/java/com/stardust/autojs/runtime/api/Shell.java b/autojs/src/main/java/com/stardust/autojs/runtime/api/Shell.java
index e7a76632..22581fb4 100644
--- a/autojs/src/main/java/com/stardust/autojs/runtime/api/Shell.java
+++ b/autojs/src/main/java/com/stardust/autojs/runtime/api/Shell.java
@@ -69,6 +69,7 @@ public class Shell extends AbstractShell {
     private volatile RuntimeException mInitException;
     private volatile boolean mInitialized = false;
     private volatile boolean mWaitingExit = false;
+    private final boolean mShouldReadOutput;
     private Callback mCallback;
 
     public Shell(Context context) {
@@ -76,7 +77,12 @@ public class Shell extends AbstractShell {
     }
 
     public Shell(Context context, boolean root) {
+        this(context, root, true);
+    }
+
+    public Shell(Context context, boolean root, boolean shouldReadOutput) {
         super(context, root);
+        mShouldReadOutput = shouldReadOutput;
     }
 
     public Shell() {
@@ -96,7 +102,7 @@ public class Shell extends AbstractShell {
                 TermSettings settings = new TermSettings(mContext.getResources(), PreferenceManager.getDefaultSharedPreferences(mContext));
                 try {
                     mTermSession = new MyShellTermSession(settings, initialCommand);
-                    mTermSession.initializeEmulator(40, 40);
+                    mTermSession.initializeEmulator(1024, 40);
                 } catch (IOException e) {
                     mInitException = new UncheckedIOException(e);
                 }
@@ -181,6 +187,9 @@ public class Shell extends AbstractShell {
         }
     }
 
+    public TermSession getTermSession() {
+        return mTermSession;
+    }
 
     private class MyShellTermSession extends ShellTermSession {
 
@@ -193,7 +202,9 @@ public class Shell extends AbstractShell {
             PipedInputStream pipedInputStream = new PipedInputStream(8192);
             mBufferedReader = new BufferedReader(new InputStreamReader(pipedInputStream));
             mOutputStream = new PipedOutputStream(pipedInputStream);
-            startReadingThread();
+            if (mShouldReadOutput) {
+                startReadingThread();
+            }
         }
 
         private void startReadingThread() {
@@ -215,7 +226,7 @@ public class Shell extends AbstractShell {
         }
 
         private void onNewLine(String line) {
-            Log.d(TAG, line);
+            //Log.d(TAG, line);
             if (!mInitialized) {
                 if (isRoot() && line.endsWith(" $ su")) {
                     notifyInitialized();
@@ -277,6 +288,8 @@ public class Shell extends AbstractShell {
         @Override
         public void finish() {
             super.finish();
+            if (!mShouldReadOutput)
+                return;
             mReadingThread.interrupt();
             try {
                 mBufferedReader.close();
diff --git a/autojs/src/main/java/com/stardust/autojs/util/ProcessUtils.java b/autojs/src/main/java/com/stardust/autojs/util/ProcessUtils.java
index 130ac783..4deee6a2 100644
--- a/autojs/src/main/java/com/stardust/autojs/util/ProcessUtils.java
+++ b/autojs/src/main/java/com/stardust/autojs/util/ProcessUtils.java
@@ -24,7 +24,7 @@ public class ProcessUtils {
 
     }
 
-    private static int getProcessPid(Process process) {
+    public static int getProcessPid(Process process) {
         try {
             Field pid = process.getClass().getDeclaredField("pid");
             pid.setAccessible(true);