diff --git a/app/build.gradle b/app/build.gradle
index bf8037ff..0b633908 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -7,8 +7,8 @@ android {
         applicationId "com.stardust.scriptdroid"
         minSdkVersion 19
         targetSdkVersion 23
-        versionCode 10
-        versionName "0.17.02050预览版"
+        versionCode 20
+        versionName "1.17.0212"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
@@ -46,6 +46,8 @@ dependencies {
     compile 'com.furture.react:DuktapeJava:1.1.0'
     compile 'com.zzhoujay.markdown:markdown:1.0.2'
     compile 'moe.feng:AlipayZeroSdk:1.1'
+    compile 'com.jraska:console:0.4.3'
+    compile 'com.jraska:console-timber-tree:0.4.3'
 
     compile files('libs/JSTransformer.jar')
 
@@ -57,5 +59,4 @@ dependencies {
     compile(name:'920-file_explorer-release', ext:'aar')
     compile(name:'920-app-debug', ext:'aar')
 
-
 }
diff --git a/app/libs/mutable-theme-debug.aar b/app/libs/mutable-theme-debug.aar
new file mode 100644
index 00000000..1fb7af45
Binary files /dev/null and b/app/libs/mutable-theme-debug.aar differ
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 814361a2..e6b0d4cf 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -75,6 +75,7 @@
         <activity android:name=".DocumentActivity"/>
         <activity android:name=".AboutActivity"/>
         <activity android:name=".SettingsActivity"/>
+        <activity android:name=".droid.ConsoleActivity"/>
         <activity android:name=".ErrorReportActivity"/>
         <activity android:name=".droid.script.ScriptExecuteActivity"/>
 
diff --git a/app/src/main/assets/javasccript_engine_init.js b/app/src/main/assets/javasccript_engine_init.js
index efc5525d..08f46a6b 100644
--- a/app/src/main/assets/javasccript_engine_init.js
+++ b/app/src/main/assets/javasccript_engine_init.js
@@ -42,6 +42,8 @@ var longClick = function(a, b, c, d){
 var scrollUp = function(a, b, c, d){
     if(arguments.length == 0)
         return droid.scrollAllUp();
+    if(arguments.length == 1 && typeof a === 'number')
+        return droid.scrollUp(a);
     return performAction(function(target){
         return droid.scrollUp(target);
     }, arguments);
@@ -49,8 +51,10 @@ var scrollUp = function(a, b, c, d){
 
 var scrollDown = function(a, b, c, d){
      if(arguments.length == 0)
-            return droid.scrollAllDown();
-       return performAction(function(target){
+        return droid.scrollAllDown();
+     if(arguments.length == 1 && typeof a === 'number')
+        return droid.scrollDown(a);
+      return performAction(function(target){
         return droid.scrollDown(target);
     }, arguments);
 }
@@ -97,3 +101,18 @@ var notStopped = function(){
     return !isStopped();
 }
 
+var log = function(str){
+    droid.log(str);
+}
+
+var err = function(e){
+   droid.err(e);
+}
+
+var openConsole = function(){
+    droid.console();
+}
+
+var clearConsole = function(){
+    droid.clearConsole();
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/stardust/scriptdroid/BaseActivity.java b/app/src/main/java/com/stardust/scriptdroid/BaseActivity.java
index c29b14e5..392966aa 100644
--- a/app/src/main/java/com/stardust/scriptdroid/BaseActivity.java
+++ b/app/src/main/java/com/stardust/scriptdroid/BaseActivity.java
@@ -1,10 +1,14 @@
 package com.stardust.scriptdroid;
 
 import android.os.Build;
+import android.os.Bundle;
+import android.support.annotation.Nullable;
 import android.support.annotation.RequiresApi;
 import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
 import android.view.View;
 
+
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
@@ -18,9 +22,13 @@ import static android.content.pm.PackageManager.PERMISSION_GRANTED;
 
 public class BaseActivity extends AppCompatActivity {
 
-
     protected static final int PERMISSION_REQUEST_CODE = 11186;
 
+    @Override
+    protected void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+    }
+
     @SuppressWarnings("unchecked")
     public <T extends View> T $(int resId) {
         return (T) findViewById(resId);
@@ -49,4 +57,18 @@ public class BaseActivity extends AppCompatActivity {
         return list.toArray(new String[list.size()]);
     }
 
+    public void setToolbarAsBack(String title) {
+        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
+        toolbar.setTitle(title);
+        setSupportActionBar(toolbar);
+        if (getSupportActionBar() != null) {
+            toolbar.setNavigationOnClickListener(new View.OnClickListener() {
+                @Override
+                public void onClick(View v) {
+                    finish();
+                }
+            });
+            getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+        }
+    }
 }
diff --git a/app/src/main/java/com/stardust/scriptdroid/MainActivity.java b/app/src/main/java/com/stardust/scriptdroid/MainActivity.java
index 37411b4f..c9f38170 100644
--- a/app/src/main/java/com/stardust/scriptdroid/MainActivity.java
+++ b/app/src/main/java/com/stardust/scriptdroid/MainActivity.java
@@ -94,6 +94,7 @@ public class MainActivity extends BaseActivity implements FileChooserDialog.File
         setUpToolbar();
         setUpScriptList();
         ViewBinder.bind(this);
+
     }
 
     private void setUpToolbar() {
diff --git a/app/src/main/java/com/stardust/scriptdroid/droid/ConsoleActivity.java b/app/src/main/java/com/stardust/scriptdroid/droid/ConsoleActivity.java
new file mode 100644
index 00000000..91ac6910
--- /dev/null
+++ b/app/src/main/java/com/stardust/scriptdroid/droid/ConsoleActivity.java
@@ -0,0 +1,74 @@
+package com.stardust.scriptdroid.droid;
+
+import android.content.Context;
+import android.graphics.Color;
+import android.os.Bundle;
+import android.support.annotation.Nullable;
+import android.util.AttributeSet;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.widget.TextView;
+
+import com.jraska.console.Console;
+import com.stardust.scriptdroid.BaseActivity;
+import com.stardust.scriptdroid.R;
+
+/**
+ * Created by Stardust on 2017/2/12.
+ */
+
+public class ConsoleActivity extends BaseActivity {
+
+    @Override
+    protected void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setUpUI();
+    }
+
+    private void setUpUI() {
+        setContentView(R.layout.activity_console);
+        setToolbarAsBack(getString(R.string.text_console));
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        getMenuInflater().inflate(R.menu.menu_console, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        Console.clear();
+        return super.onOptionsItemSelected(item);
+    }
+
+    public static class ConsoleView extends Console {
+
+        public ConsoleView(Context context) {
+            super(context);
+            init();
+        }
+
+        public ConsoleView(Context context, AttributeSet attrs) {
+            super(context, attrs);
+            init();
+        }
+
+        public ConsoleView(Context context, AttributeSet attrs, int defStyleAttr) {
+            super(context, attrs, defStyleAttr);
+            init();
+        }
+
+        public ConsoleView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+            super(context, attrs, defStyleAttr, defStyleRes);
+            init();
+        }
+
+        private void init() {
+            findViewById(R.id.console_scroll_view).setBackgroundColor(Color.WHITE);
+            ((TextView) findViewById(R.id.console_text)).setTextIsSelectable(true);
+        }
+
+    }
+
+}
diff --git a/app/src/main/java/com/stardust/scriptdroid/droid/Droid.java b/app/src/main/java/com/stardust/scriptdroid/droid/Droid.java
index 845ed94f..cf4c9233 100644
--- a/app/src/main/java/com/stardust/scriptdroid/droid/Droid.java
+++ b/app/src/main/java/com/stardust/scriptdroid/droid/Droid.java
@@ -1,9 +1,8 @@
 package com.stardust.scriptdroid.droid;
 
 import android.app.Activity;
-import android.content.DialogInterface;
 
-import com.afollestad.materialdialogs.MaterialDialog;
+import com.jraska.console.timber.ConsoleTree;
 import com.stardust.scriptdroid.App;
 import com.stardust.scriptdroid.R;
 import com.stardust.scriptdroid.droid.runtime.DroidRuntime;
@@ -15,12 +14,20 @@ import com.stardust.scriptdroid.file.FileUtils;
 import java.io.File;
 import java.io.FileNotFoundException;
 
+import timber.log.Timber;
+
 /**
  * Created by Stardust on 2017/1/23.
  */
 
 public class Droid {
 
+    static {
+        Timber.plant(new ConsoleTree.Builder()
+                .infoColor(0xcc000000)
+                .build());
+    }
+
     public static final String UI = "\"ui\";";
 
     public interface OnRunFinishedListener {
@@ -34,6 +41,7 @@ public class Droid {
         public void onRunFinished(Object result, Exception e) {
             if (e != null) {
                 RUNTIME.toast(App.getApp().getString(R.string.text_error) + ": " + e.getMessage());
+                Timber.e(App.getApp().getString(R.string.text_error), e);
             }
         }
     };
diff --git a/app/src/main/java/com/stardust/scriptdroid/droid/runtime/DroidRuntime.java b/app/src/main/java/com/stardust/scriptdroid/droid/runtime/DroidRuntime.java
index b117ad7f..b7c9e5d6 100644
--- a/app/src/main/java/com/stardust/scriptdroid/droid/runtime/DroidRuntime.java
+++ b/app/src/main/java/com/stardust/scriptdroid/droid/runtime/DroidRuntime.java
@@ -5,12 +5,15 @@ import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
 import android.graphics.Rect;
 import android.os.Handler;
+import android.support.annotation.Nullable;
 import android.view.accessibility.AccessibilityNodeInfo;
 import android.widget.Toast;
 
 import com.afollestad.materialdialogs.MaterialDialog;
+import com.jraska.console.Console;
 import com.stardust.scriptdroid.App;
 import com.stardust.scriptdroid.R;
+import com.stardust.scriptdroid.droid.ConsoleActivity;
 import com.stardust.scriptdroid.droid.runtime.action.Action;
 import com.stardust.scriptdroid.droid.runtime.action.ActionFactory;
 import com.stardust.scriptdroid.droid.runtime.action.ActionPerformService;
@@ -19,6 +22,8 @@ import com.stardust.scriptdroid.droid.runtime.api.IDroidRuntime;
 
 import java.util.List;
 
+import timber.log.Timber;
+
 ;
 
 /**
@@ -30,7 +35,7 @@ public class DroidRuntime implements IDroidRuntime {
     private static final String TAG = "DroidRuntime";
     private static DroidRuntime runtime = new DroidRuntime();
 
-    private final Object mLock = new Object();
+    private final Object mActionPerformLock = new Object();
     private boolean mActionPerformResult;
     private Handler mUIHandler;
 
@@ -105,12 +110,22 @@ public class DroidRuntime implements IDroidRuntime {
         return performAction(target.createAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD));
     }
 
+    @Override
+    public boolean scrollUp(int i) {
+        return performAction(ActionFactory.createScrollAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD, i));
+    }
+
+    @Override
+    public boolean scrollDown(int i) {
+        return performAction(ActionFactory.createScrollAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD, i));
+    }
+
     public boolean scrollAllUp() {
-        return performAction(ActionFactory.createScrollAllAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD));
+        return performAction(ActionFactory.createScrollMaxAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD));
     }
 
     public boolean scrollAllDown() {
-        return performAction(ActionFactory.createScrollAllAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD));
+        return performAction(ActionFactory.createScrollMaxAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD));
     }
 
     @Override
@@ -133,6 +148,21 @@ public class DroidRuntime implements IDroidRuntime {
         return performAction(target.createAction(AccessibilityNodeInfo.ACTION_PASTE));
     }
 
+    public void log(@Nullable Object str) {
+        Timber.i("" + str);
+    }
+
+    public void err(@Nullable Object o) {
+        Timber.e("" + o);
+    }
+
+    public void console() {
+        App.getApp().startActivity(new Intent(App.getApp(), ConsoleActivity.class).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
+    }
+
+    public void clearConsole(){
+        Console.clear();
+    }
 
     private boolean performAction(Action action) {
         if (ActionPerformService.getInstance() == null) {
@@ -140,9 +170,9 @@ public class DroidRuntime implements IDroidRuntime {
             throw new ScriptStopException(App.getApp().getString(R.string.text_no_accessibility_permission));
         }
         ActionPerformService.setAction(action);
-        synchronized (mLock) {
+        synchronized (mActionPerformLock) {
             try {
-                mLock.wait();
+                mActionPerformLock.wait();
             } catch (InterruptedException e) {
                 ActionPerformService.setActions(ActionPerformService.NO_ACTION);
                 throw new ScriptStopException(App.getApp().getString(R.string.text_script_stopped), e);
@@ -161,7 +191,6 @@ public class DroidRuntime implements IDroidRuntime {
         });
     }
 
-
     @Override
     public void sleep(long millis) {
         try {
@@ -207,8 +236,8 @@ public class DroidRuntime implements IDroidRuntime {
 
     public void notifyActionPerformed(boolean succeed) {
         mActionPerformResult = succeed;
-        synchronized (mLock) {
-            mLock.notify();
+        synchronized (mActionPerformLock) {
+            mActionPerformLock.notify();
         }
     }
 
diff --git a/app/src/main/java/com/stardust/scriptdroid/droid/runtime/action/ActionFactory.java b/app/src/main/java/com/stardust/scriptdroid/droid/runtime/action/ActionFactory.java
index 611f275b..b5e3be3f 100644
--- a/app/src/main/java/com/stardust/scriptdroid/droid/runtime/action/ActionFactory.java
+++ b/app/src/main/java/com/stardust/scriptdroid/droid/runtime/action/ActionFactory.java
@@ -50,7 +50,11 @@ public class ActionFactory {
         };
     }
 
-    public static Action createScrollAllAction(int action) {
-        return new ScrollAllAction(action);
+    public static Action createScrollMaxAction(int action) {
+        return new ScrollMaxAction(action);
+    }
+
+    public static Action createScrollAction(int action, int i){
+        return new ScrollAction(action, i);
     }
 }
diff --git a/app/src/main/java/com/stardust/scriptdroid/droid/runtime/action/ActionPerformService.java b/app/src/main/java/com/stardust/scriptdroid/droid/runtime/action/ActionPerformService.java
index da88bfb0..af75677c 100644
--- a/app/src/main/java/com/stardust/scriptdroid/droid/runtime/action/ActionPerformService.java
+++ b/app/src/main/java/com/stardust/scriptdroid/droid/runtime/action/ActionPerformService.java
@@ -24,7 +24,7 @@ import java.util.List;
 public class ActionPerformService extends AccessibilityService {
 
     private static final String TAG = "ActionPerformService";
-    private static ActionPerformService instance;
+    private static volatile ActionPerformService instance;
 
     @SuppressWarnings("unchecked")
     public static final List<Action> NO_ACTION = Collections.EMPTY_LIST;
@@ -98,17 +98,22 @@ public class ActionPerformService extends AccessibilityService {
 
     @Override
     public void onServiceConnected() {
+        // FIXME: 2017/2/12 有时在无障碍中开启服务后这里不会调用服务也不会运行，安卓的BUG???
         Log.v(TAG, "onServiceConnected");
+    }
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        Log.v(TAG, "onCreate");
         instance = this;
     }
 
     public static void disable() {
-        if (instance != null) {
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
-                instance.disableSelf();
-            } else {
-                AccessibilityServiceUtils.goToAccessibilitySetting(App.getApp());
-            }
+        if (instance != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            instance.disableSelf();
+        } else {
+            AccessibilityServiceUtils.goToAccessibilitySetting(App.getApp());
         }
     }
 
diff --git a/app/src/main/java/com/stardust/scriptdroid/droid/runtime/action/ScrollAction.java b/app/src/main/java/com/stardust/scriptdroid/droid/runtime/action/ScrollAction.java
new file mode 100644
index 00000000..e66915fb
--- /dev/null
+++ b/app/src/main/java/com/stardust/scriptdroid/droid/runtime/action/ScrollAction.java
@@ -0,0 +1,57 @@
+package com.stardust.scriptdroid.droid.runtime.action;
+
+import android.view.accessibility.AccessibilityNodeInfo;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Created by Stardust on 2017/2/12.
+ */
+public class ScrollAction extends Action {
+
+    private int mIndex, mAction;
+
+    public ScrollAction(int action, int i) {
+        mAction = action;
+        mIndex = i;
+    }
+
+    @Override
+    public boolean perform(AccessibilityNodeInfo root) {
+        List<AccessibilityNodeInfo> scrollableNodes = findScrollableNodes(root);
+        boolean result = mIndex < scrollableNodes.size() && scrollableNodes.get(mIndex).performAction(mAction);
+        recycle(scrollableNodes, root);
+        return result;
+    }
+
+    private void recycle(List<AccessibilityNodeInfo> list, AccessibilityNodeInfo root) {
+        for (AccessibilityNodeInfo nodeInfo : list) {
+            if (nodeInfo != root)
+                nodeInfo.recycle();
+        }
+    }
+
+    private List<AccessibilityNodeInfo> findScrollableNodes(AccessibilityNodeInfo root) {
+        List<AccessibilityNodeInfo> list = new ArrayList<>();
+        findScrollableNodes(root, list);
+        return list;
+    }
+
+    private static boolean findScrollableNodes(AccessibilityNodeInfo node, List<AccessibilityNodeInfo> list) {
+        if (node == null) {
+            return false;
+        }
+        if (node.isScrollable()) {
+            list.add(node);
+        }
+        for (int i = 0; i < node.getChildCount(); i++) {
+            AccessibilityNodeInfo child = node.getChild(i);
+            if (child == null)
+                continue;
+            if (!findScrollableNodes(child, list))
+                child.recycle();
+        }
+        return node.isScrollable();
+    }
+}
diff --git a/app/src/main/java/com/stardust/scriptdroid/droid/runtime/action/ScrollAllAction.java b/app/src/main/java/com/stardust/scriptdroid/droid/runtime/action/ScrollAllAction.java
deleted file mode 100644
index dbbfb956..00000000
--- a/app/src/main/java/com/stardust/scriptdroid/droid/runtime/action/ScrollAllAction.java
+++ /dev/null
@@ -1,38 +0,0 @@
-package com.stardust.scriptdroid.droid.runtime.action;
-
-import android.view.accessibility.AccessibilityNodeInfo;
-
-/**
- * Created by Stardust on 2017/1/27.
- */
-
-public class ScrollAllAction extends Action {
-
-    private int mScrollAction;
-
-    public ScrollAllAction(int scrollAction) {
-        mScrollAction = scrollAction;
-    }
-
-    @Override
-    public boolean perform(AccessibilityNodeInfo rootNodeInfo) {
-        AccessibilityNodeInfo scrollableNodeInfo = findScrollableNodeInfo(rootNodeInfo);
-        return scrollableNodeInfo != null && scrollableNodeInfo.performAction(mScrollAction);
-    }
-
-    private AccessibilityNodeInfo findScrollableNodeInfo(AccessibilityNodeInfo nodeInfo) {
-        if (nodeInfo == null)
-            return null;
-        if (nodeInfo.isScrollable()) {
-            return nodeInfo;
-        }
-        for (int i = 0; i < nodeInfo.getChildCount(); i++) {
-            AccessibilityNodeInfo node = findScrollableNodeInfo(nodeInfo.getChild(i));
-            if (node != null) {
-                return node;
-            }
-        }
-        return null;
-    }
-
-}
diff --git a/app/src/main/java/com/stardust/scriptdroid/droid/runtime/action/ScrollMaxAction.java b/app/src/main/java/com/stardust/scriptdroid/droid/runtime/action/ScrollMaxAction.java
new file mode 100644
index 00000000..4057c48e
--- /dev/null
+++ b/app/src/main/java/com/stardust/scriptdroid/droid/runtime/action/ScrollMaxAction.java
@@ -0,0 +1,70 @@
+package com.stardust.scriptdroid.droid.runtime.action;
+
+import android.graphics.Rect;
+import android.util.Log;
+import android.view.accessibility.AccessibilityNodeInfo;
+
+/**
+ * Created by Stardust on 2017/1/27.
+ */
+
+public class ScrollMaxAction extends Action {
+
+    private static final String TAG = ScrollMaxAction.class.getSimpleName();
+    private int mScrollAction;
+    private AccessibilityNodeInfo mMaxScrollableNode;
+    private AccessibilityNodeInfo mRootNode;
+
+    public ScrollMaxAction(int scrollAction) {
+        mScrollAction = scrollAction;
+    }
+
+    @Override
+    public boolean perform(AccessibilityNodeInfo rootNodeInfo) {
+        reset();
+        mRootNode = rootNodeInfo;
+        findMaxScrollableNodeInfo(rootNodeInfo);
+        boolean result = mMaxScrollableNode != null && mMaxScrollableNode.performAction(mScrollAction);
+        reset();
+        return result;
+    }
+
+    private void reset() {
+        if (mMaxScrollableNode != null && mMaxScrollableNode != mRootNode) {
+            mMaxScrollableNode.recycle();
+        }
+        mMaxScrollableNode = mRootNode = null;
+    }
+
+    private void findMaxScrollableNodeInfo(AccessibilityNodeInfo nodeInfo) {
+        if (nodeInfo == null)
+            return;
+        if (nodeInfo.isScrollable()) {
+            if (mMaxScrollableNode == null) {
+                mMaxScrollableNode = nodeInfo;
+            } else if (getAreaInScreen(mMaxScrollableNode) < getAreaInScreen(nodeInfo)) {
+                if (mMaxScrollableNode != mRootNode)
+                    mMaxScrollableNode.recycle();
+                mMaxScrollableNode = nodeInfo;
+            }
+        }
+        for (int i = 0; i < nodeInfo.getChildCount(); i++) {
+            AccessibilityNodeInfo child = nodeInfo.getChild(i);
+            if (child != null) {
+                findMaxScrollableNodeInfo(child);
+                if (mMaxScrollableNode != child) {
+                    child.recycle();
+                }
+            }
+        }
+    }
+
+    private long getAreaInScreen(AccessibilityNodeInfo nodeInfo) {
+        Rect rect = new Rect();
+        nodeInfo.getBoundsInScreen(rect);
+        long area = ((long) rect.width()) * rect.height();
+        Log.v(TAG, "area=" + area);
+        return area;
+    }
+
+}
diff --git a/app/src/main/java/com/stardust/scriptdroid/droid/runtime/api/IDroidRuntime.java b/app/src/main/java/com/stardust/scriptdroid/droid/runtime/api/IDroidRuntime.java
index 0def225f..4f932863 100644
--- a/app/src/main/java/com/stardust/scriptdroid/droid/runtime/api/IDroidRuntime.java
+++ b/app/src/main/java/com/stardust/scriptdroid/droid/runtime/api/IDroidRuntime.java
@@ -30,6 +30,10 @@ public interface IDroidRuntime {
 
     boolean scrollDown(ActionTarget target);
 
+    boolean scrollUp(int i);
+
+    boolean scrollDown(int i);
+
     boolean focus(ActionTarget target);
 
     boolean select(ActionTarget target);
diff --git a/app/src/main/java/com/stardust/scriptdroid/droid/script/ScriptExecuteActivity.java b/app/src/main/java/com/stardust/scriptdroid/droid/script/ScriptExecuteActivity.java
index 0a1227b2..47346969 100644
--- a/app/src/main/java/com/stardust/scriptdroid/droid/script/ScriptExecuteActivity.java
+++ b/app/src/main/java/com/stardust/scriptdroid/droid/script/ScriptExecuteActivity.java
@@ -26,7 +26,7 @@ public class ScriptExecuteActivity extends Activity {
         ScriptExecuteActivity.script = script;
         ScriptExecuteActivity.onRunFinishedListener = listener;
         ScriptExecuteActivity.runningConfig = config;
-        App.getApp().startActivity(new Intent(App.getApp(), ScriptExecuteActivity.class));
+        App.getApp().startActivity(new Intent(App.getApp(), ScriptExecuteActivity.class).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
     }
 
     @Override
diff --git a/app/src/main/java/com/stardust/scriptdroid/ui/EditSideMenuFragment.java b/app/src/main/java/com/stardust/scriptdroid/ui/EditSideMenuFragment.java
index f31a0b09..34d3437e 100644
--- a/app/src/main/java/com/stardust/scriptdroid/ui/EditSideMenuFragment.java
+++ b/app/src/main/java/com/stardust/scriptdroid/ui/EditSideMenuFragment.java
@@ -12,6 +12,7 @@ import android.view.ViewGroup;
 import com.stardust.scriptdroid.App;
 import com.stardust.scriptdroid.DocumentActivity;
 import com.stardust.scriptdroid.R;
+import com.stardust.scriptdroid.droid.ConsoleActivity;
 import com.stardust.scriptdroid.droid.assist.BoundsAssistant;
 import com.stardust.view.ViewBinder;
 import com.stardust.view.ViewBinding;
@@ -86,6 +87,11 @@ public class EditSideMenuFragment extends com.stardust.app.Fragment {
         startActivity(new Intent(getContext(), DocumentActivity.class));
     }
 
+    @ViewBinding.Click(R.id.console)
+    private void startConsoleActivity() {
+        startActivity(new Intent(getContext(), ConsoleActivity.class));
+    }
+
     @ViewBinding.Check(R.id.sw_assist_service)
     private void setAssistServiceEnable(boolean enable) {
         BoundsAssistant.setAssistModeEnable(enable);
diff --git a/app/src/main/java/com/stardust/scriptdroid/ui/SlideMenuFragment.java b/app/src/main/java/com/stardust/scriptdroid/ui/SlideMenuFragment.java
index aeffd475..ef1622cf 100644
--- a/app/src/main/java/com/stardust/scriptdroid/ui/SlideMenuFragment.java
+++ b/app/src/main/java/com/stardust/scriptdroid/ui/SlideMenuFragment.java
@@ -14,6 +14,7 @@ import com.stardust.app.Fragment;
 import com.stardust.scriptdroid.App;
 import com.stardust.scriptdroid.DocumentActivity;
 import com.stardust.scriptdroid.R;
+import com.stardust.scriptdroid.droid.ConsoleActivity;
 import com.stardust.scriptdroid.droid.Droid;
 import com.stardust.scriptdroid.droid.assist.BoundsAssistant;
 import com.stardust.scriptdroid.droid.runtime.action.ActionPerformService;
@@ -72,6 +73,12 @@ public class SlideMenuFragment extends Fragment {
         App.getStateObserver().register(KEY_ASSIST_MODE_NOTIFICATION, mAssistServiceNotificationSwitch);
     }
 
+
+    @ViewBinding.Click(R.id.console)
+    private void startConsoleActivity() {
+        startActivity(new Intent(getContext(), ConsoleActivity.class));
+    }
+
     @ViewBinding.Click(R.id.syntax_and_api)
     private void startSyntaxHelpActivity() {
         startActivity(new Intent(getContext(), DocumentActivity.class));
diff --git a/app/src/main/java/com/stardust/util/CrashHandler.java b/app/src/main/java/com/stardust/util/CrashHandler.java
index 8982ca2f..b6b36d1f 100644
--- a/app/src/main/java/com/stardust/util/CrashHandler.java
+++ b/app/src/main/java/com/stardust/util/CrashHandler.java
@@ -17,6 +17,8 @@ import java.lang.Thread.UncaughtExceptionHandler;
 
 public class CrashHandler implements UncaughtExceptionHandler {
     private static final String TAG = "CrashHandler";
+    private static int crashCount = 0;
+    private static long firstCrashMillis = 0;
     private final Class<?> mErrorReportClass;
 
     public CrashHandler(Class<?> errorReportClass) {
@@ -26,16 +28,40 @@ public class CrashHandler implements UncaughtExceptionHandler {
     public void uncaughtException(Thread thread, Throwable ex) {
         try {
             Log.e(TAG, "Uncaught Exception", ex);
-            String t = App.getApp().getString(R.string.sorry_for_crash) + ex.toString();
-            Intent intent = new Intent(App.getApp(), this.mErrorReportClass);
-            intent.putExtra("message", t);
-            intent.putExtra("error", throwableToString(ex));
-            App.getApp().startActivity(intent);
+            if (crashTooManyTimes())
+                return;
+            String msg = App.getApp().getString(R.string.sorry_for_crash) + ex.toString();
+            startErrorReportActivity(msg, throwableToString(ex));
             System.exit(0);
-        } catch (Throwable var6) {
-            var6.printStackTrace();
+        } catch (Throwable throwable) {
+            throwable.printStackTrace();
         }
+    }
 
+    private void startErrorReportActivity(String msg, String detail) {
+        Intent intent = new Intent(App.getApp(), this.mErrorReportClass);
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP);
+        intent.putExtra("message", msg);
+        intent.putExtra("error", detail);
+        App.getApp().startActivity(intent);
+    }
+
+    private boolean crashTooManyTimes() {
+        if (crashIntervalTooLong()) {
+            resetCrashCount();
+            return false;
+        }
+        crashCount++;
+        return crashCount >= 5;
+    }
+
+    private void resetCrashCount() {
+        firstCrashMillis = System.currentTimeMillis();
+        crashCount = 0;
+    }
+
+    private boolean crashIntervalTooLong() {
+        return System.currentTimeMillis() - firstCrashMillis > 3000;
     }
 
     public static String throwableToString(Throwable throwable) {
diff --git a/app/src/main/res/drawable/ic_console_green.png b/app/src/main/res/drawable/ic_console_green.png
new file mode 100644
index 00000000..0a147a07
Binary files /dev/null and b/app/src/main/res/drawable/ic_console_green.png differ
diff --git a/app/src/main/res/drawable/ic_robot_green.png b/app/src/main/res/drawable/ic_robot_green.png
index a448ebcd..69fe5222 100644
Binary files a/app/src/main/res/drawable/ic_robot_green.png and b/app/src/main/res/drawable/ic_robot_green.png differ
diff --git a/app/src/main/res/drawable/ic_robot_head_green.png b/app/src/main/res/drawable/ic_robot_head_green.png
index 56c82ee4..b0eae7e9 100644
Binary files a/app/src/main/res/drawable/ic_robot_head_green.png and b/app/src/main/res/drawable/ic_robot_head_green.png differ
diff --git a/app/src/main/res/layout/activity_console.xml b/app/src/main/res/layout/activity_console.xml
new file mode 100644
index 00000000..63f49626
--- /dev/null
+++ b/app/src/main/res/layout/activity_console.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              xmlns:app="http://schemas.android.com/apk/res-auto"
+              android:layout_width="match_parent"
+              android:layout_height="match_parent"
+              android:orientation="vertical">
+
+
+    <android.support.design.widget.AppBarLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:theme="@style/AppTheme.AppBarOverlay">
+
+        <android.support.v7.widget.Toolbar
+            android:id="@+id/toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="?attr/actionBarSize"
+            android:background="?attr/colorPrimary"
+            app:popupTheme="@style/AppTheme.PopupOverlay"/>
+
+    </android.support.design.widget.AppBarLayout>
+
+    <view
+        android:id="@+id/console"
+        class="com.stardust.scriptdroid.droid.ConsoleActivity$ConsoleView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"/>
+
+</LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_edit_side_menu.xml b/app/src/main/res/layout/fragment_edit_side_menu.xml
index 785c0600..cdf80b5d 100644
--- a/app/src/main/res/layout/fragment_edit_side_menu.xml
+++ b/app/src/main/res/layout/fragment_edit_side_menu.xml
@@ -5,6 +5,28 @@
               android:orientation="vertical"
               android:textSize="16sp">
 
+    <LinearLayout
+        android:id="@+id/console"
+        android:layout_width="match_parent"
+        android:layout_height="52dp"
+        android:background="?selectableItemBackground"
+        android:gravity="center_vertical"
+        android:orientation="horizontal">
+
+        <ImageView
+            android:layout_width="20dp"
+            android:layout_height="20dp"
+            android:layout_margin="16dp"
+            android:src="@drawable/ic_console_green"/>
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="match_parent"
+            android:gravity="center"
+            android:text="@string/text_console"
+            android:textColor="@android:color/primary_text_light"/>
+    </LinearLayout>
+
     <LinearLayout
         android:id="@+id/syntax_and_api"
         android:layout_width="match_parent"
@@ -27,6 +49,7 @@
             android:textColor="@android:color/primary_text_light"/>
     </LinearLayout>
 
+
     <RelativeLayout
         android:id="@+id/assist_service"
         android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_slide_menu.xml b/app/src/main/res/layout/fragment_slide_menu.xml
index cffa759f..fbfa2e34 100644
--- a/app/src/main/res/layout/fragment_slide_menu.xml
+++ b/app/src/main/res/layout/fragment_slide_menu.xml
@@ -5,6 +5,28 @@
               android:layout_height="match_parent"
               android:orientation="vertical">
 
+    <LinearLayout
+        android:id="@+id/console"
+        android:layout_width="match_parent"
+        android:layout_height="52dp"
+        android:background="?selectableItemBackground"
+        android:gravity="center_vertical"
+        android:orientation="horizontal">
+
+        <ImageView
+            android:layout_width="20dp"
+            android:layout_height="20dp"
+            android:layout_margin="16dp"
+            android:src="@drawable/ic_console_green"/>
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="match_parent"
+            android:gravity="center"
+            android:text="@string/text_console"
+            android:textColor="@android:color/primary_text_light"/>
+    </LinearLayout>
+
     <LinearLayout
         android:id="@+id/syntax_and_api"
         android:layout_width="match_parent"
diff --git a/app/src/main/res/menu/menu_console.xml b/app/src/main/res/menu/menu_console.xml
new file mode 100644
index 00000000..d8bece22
--- /dev/null
+++ b/app/src/main/res/menu/menu_console.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+      xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <item
+        android:orderInCategory="100"
+        android:title="@string/text_clear"
+        app:showAsAction="never"/>
+</menu>
\ No newline at end of file
diff --git a/app/src/main/res/raw/document.md b/app/src/main/res/raw/document.md
index b14b0981..b69a5c1b 100644
--- a/app/src/main/res/raw/document.md
+++ b/app/src/main/res/raw/document.md
@@ -12,7 +12,7 @@
 > 以下的longClick、select、scrollUp、scrollDown的参数均与click类似，不再赘述。
 * `longClick` 长按
 * `select` 选择
-* `scrollUp` 上滑。不加参数时会寻找"最大"的可滑动的控件上滑，例如微信消息列表等。
+* `scrollUp` 上滑。不加参数时会寻找"最大"的可滑动的控件上滑，例如微信消息列表等; 参数为一个整数i时会找到第i个可滑动控件滑动。
 * `scrollDown` 下滑。不加参数时与scrollUp类似。
 * `input(text)` 把所有输入框的文本都置为text。例如input("测试")。
 * `input(i, text)` 把第i个输入框的文本设为text。i从0开始。
@@ -28,7 +28,23 @@
 * `context` ApplicationContext，参见安卓[android.content.Context](https://developer.android.com/reference/android/content/Context.html)
 > 这里的context由于是ApplicationContext，是不可见的，不能用于dialog和其他UI相关。如果要显示弹窗或者视图，请启动UI模式（代码的第一行为`"ui";`既可）并使用activity代替。
 * `activity` UI模式下会启动一个Activity来运行脚本，并在UI线程下运行。可通过该变量来获取该activity。
-###五、在脚本中调用Java
+###五、控制台
+* `openConsole()` 打开控制台。
+* `clearConsole()` 清空控制台。
+* `log(text)` 在控制台中输出日志，以例如`log("Hello world");`。
+* `err(text)` 在控制台中输出错误信息，以红色字体显示，例如：
+
+```
+try{
+    //do something
+}catch(e){
+    err("错误);
+    err(e);
+    openConsole();
+}
+```
+
+###六、在脚本中调用Java
 使用importClass来引入要使用的库，例如:
 ```javascript
 importClass("android.view.View.OnClickListener")
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index fe61ab44..30c82671 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,6 +1,6 @@
 <resources>
     <string name="app_name">免Root脚本机器人</string>
-    <string name="version">Version 0.17.0205</string>
+    <string name="version">Version 1.17.0212</string>
     <string name="action_settings">设置</string>
     <string name="action_disable_service">关闭服务</string>
     <string name="text_accessibility_service_description">使脚本自动操作(点击、长按、滑动等)所需，若关闭则只能执行不涉及自动操作的脚本。</string>
@@ -93,4 +93,6 @@
     <string name="text_re_import_samples">重新导入示例脚本文件</string>
     <string name="text_re_import_succeed">导入成功，重新打开应用生效</string>
     <string name="text_fail">失败</string>
+    <string name="text_clear">清空</string>
+    <string name="text_console">控制台</string>
 </resources>
diff --git a/app0.17.0205.apk b/app1.17.0212.apk
similarity index 65%
rename from app0.17.0205.apk
rename to app1.17.0212.apk
index aa2198d8..0b6c1489 100644
Binary files a/app0.17.0205.apk and b/app1.17.0212.apk differ