diff --git a/app/build.gradle b/app/build.gradle
index f96f9718..3fae4f85 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -9,8 +9,8 @@ android {
         applicationId "com.stardust.scriptdroid"
         minSdkVersion 19
         targetSdkVersion 23
-        versionCode 125
-        versionName "2.0.9 Beta"
+        versionCode 126
+        versionName "2.0.10 Beta"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         multiDexEnabled true
         ndk {
diff --git a/app/src/main/assets/sample/选择器/QQ互赞脚本.js b/app/src/main/assets/sample/QQ与微信/QQ名片点赞脚本.js
similarity index 82%
rename from app/src/main/assets/sample/选择器/QQ互赞脚本.js
rename to app/src/main/assets/sample/QQ与微信/QQ名片点赞脚本.js
index ced0b269..94694c59 100644
--- a/app/src/main/assets/sample/选择器/QQ互赞脚本.js
+++ b/app/src/main/assets/sample/QQ与微信/QQ名片点赞脚本.js
@@ -14,7 +14,9 @@ function 显示更多(){
    } 
 }
 
-toast("请打开点赞自己的人的界面");
+toast("请打开自己的资料页，点击点赞图标");
+sleep(100);
+
 while(notStopped()){
   for(let i = 0; i < 10; i++){
     赞();
diff --git a/app/src/main/assets/sample/QQ与微信/QQ循环发送图片.js b/app/src/main/assets/sample/QQ与微信/QQ循环发送图片.js
new file mode 100644
index 00000000..f109259f
--- /dev/null
+++ b/app/src/main/assets/sample/QQ与微信/QQ循环发送图片.js
@@ -0,0 +1,17 @@
+"auto";
+
+launchApp("QQ");
+toast("请打开一个聊天窗口，将会循环发送第一张图片100次");
+
+while(!id("ivTitleBtnRightImage").exists());
+
+var listParent = className("AbsListView").findOne().parent();
+var icons = listParent.child(listParent.childCount() - 2);
+icons.child(1).click();
+sleep(200);
+
+for(i = 0; i < 100;i++){
+ className("CheckBox").untilFindOne().click();
+ sleep(200);
+ id("send_btn").click();
+}
\ No newline at end of file
diff --git a/app/src/main/assets/sample/选择器/QQ空间点赞(不完美).js b/app/src/main/assets/sample/QQ与微信/QQ空间点赞(没卵用).js
similarity index 100%
rename from app/src/main/assets/sample/选择器/QQ空间点赞(不完美).js
rename to app/src/main/assets/sample/QQ与微信/QQ空间点赞(没卵用).js
diff --git a/app/src/main/assets/sample/自动操作/QQ自动抢红包.js b/app/src/main/assets/sample/QQ与微信/QQ自动抢红包(没卵用).js
similarity index 100%
rename from app/src/main/assets/sample/自动操作/QQ自动抢红包.js
rename to app/src/main/assets/sample/QQ与微信/QQ自动抢红包(没卵用).js
diff --git a/app/src/main/assets/sample/QQ与微信/取关全部公众号.js b/app/src/main/assets/sample/QQ与微信/取关全部公众号.js
new file mode 100644
index 00000000..dfd9220f
--- /dev/null
+++ b/app/src/main/assets/sample/QQ与微信/取关全部公众号.js
@@ -0,0 +1,27 @@
+"auto";
+
+if (confirm("将会取关所有公众号，是否继续")) {
+    unfollowAll();
+}
+
+function unfollowAll() {
+    launchApp("微信");
+    sleep(1000);
+    while (!click("通讯录"));
+    while (!click("公众号"));
+    sleep(500);
+    while (true) {
+        className("ListView").findOne().children().each(function(item) {
+            if (item.longClickable()) {
+                unfollow(item);
+                sleep(400);
+            }
+        });
+    }
+}
+
+function unfollow(item) {
+    item.longClick();
+    while (!click("取消关注"));
+    while (!click("不再关注"));
+}
diff --git a/app/src/main/assets/sample/QQ与微信/好友列表名片点赞(不完美).js b/app/src/main/assets/sample/QQ与微信/好友列表名片点赞(不完美).js
new file mode 100644
index 00000000..8fc980d1
--- /dev/null
+++ b/app/src/main/assets/sample/QQ与微信/好友列表名片点赞(不完美).js
@@ -0,0 +1,54 @@
+"auto";
+
+//漏赞过多请稍微调大延迟
+var 延迟 = 200;
+
+launchApp("QQ");
+//点击联系人图标
+className("TabWidget").findOne().child(1).click();
+toast("请展开要点赞的分组");
+var fail = 0;
+
+while(true){
+
+  var list = id("elv_buddies").className("AbsListView").findOne();
+  var count = list.childCount();
+  print("count" + list.childCount());
+  
+  for(let i = 0; i < count; i++){
+    try{
+      let child = list.child(i);
+      print(i);
+      if(isFriend(child)){
+        //点进好友名片
+        child.click();
+        fav(10);
+        backToList();
+        sleep(延迟);
+      }
+    }catch(e){
+      fail++;
+      toast("可能漏赞:" + fail);
+    }
+  }
+  list.scrollForward();
+}
+
+//点赞
+function fav(times){
+  var i = 0;
+  var btn = descEndsWith("点击可赞").findOne();
+  while(i < times){
+    i += btn.click()? 1 : 0;
+  }
+}
+
+//判断是否是好友的视图
+function isFriend(child){
+  return child && child.className().endsWith("LinearLayout") && child.childCount() == 2 && child.child(0).className().endsWith("FrameLayout");
+}
+
+//返回好友列表
+function backToList(){
+  id("ivTitleBtnLeft").click();
+}
\ No newline at end of file
diff --git a/app/src/main/assets/sample/自动操作/屏蔽QQ通知.js b/app/src/main/assets/sample/QQ与微信/屏蔽QQ通知.js
similarity index 100%
rename from app/src/main/assets/sample/自动操作/屏蔽QQ通知.js
rename to app/src/main/assets/sample/QQ与微信/屏蔽QQ通知.js
diff --git a/app/src/main/assets/sample/QQ与微信/循环发送消息.js b/app/src/main/assets/sample/QQ与微信/循环发送消息.js
new file mode 100644
index 00000000..703dc4ad
--- /dev/null
+++ b/app/src/main/assets/sample/QQ与微信/循环发送消息.js
@@ -0,0 +1,10 @@
+"auto";
+
+toast("请打开一个聊天窗口");
+sleep(500);
+
+while(true){
+    input("我喜欢你");
+    click("发送");
+    sleep(200);
+}
\ No newline at end of file
diff --git a/app/src/main/assets/sample/选择器/微信一键已读.js b/app/src/main/assets/sample/QQ与微信/微信一键已读.js
similarity index 81%
rename from app/src/main/assets/sample/选择器/微信一键已读.js
rename to app/src/main/assets/sample/QQ与微信/微信一键已读.js
index 6a7df4e7..95af5d7c 100644
--- a/app/src/main/assets/sample/选择器/微信一键已读.js
+++ b/app/src/main/assets/sample/QQ与微信/微信一键已读.js
@@ -3,6 +3,6 @@
 while(true){
     if(id("i4").untilFindOne().parent().parent().click()){
       sleep(700);
-      id("gf").click();
+      back();
     }
 }
\ No newline at end of file
diff --git a/app/src/main/assets/sample/自动操作/微信扫一扫.js b/app/src/main/assets/sample/QQ与微信/微信扫一扫.js
similarity index 100%
rename from app/src/main/assets/sample/自动操作/微信扫一扫.js
rename to app/src/main/assets/sample/QQ与微信/微信扫一扫.js
diff --git a/app/src/main/assets/sample/QQ与微信/批量删除微信好友.js b/app/src/main/assets/sample/QQ与微信/批量删除微信好友.js
new file mode 100644
index 00000000..64886d74
--- /dev/null
+++ b/app/src/main/assets/sample/QQ与微信/批量删除微信好友.js
@@ -0,0 +1,18 @@
+"auto";
+
+launchApp("微信");
+while(!click("通讯录"));
+
+toast("在好友列表中点谁删谁。被删除的好友将在日志中记录。");
+while(true){
+  if(desc("更多").exists()){
+      var weChatId = textContains("微信号").find();
+      if(weChatId && weChatId.size()){
+         console.log(weChatId.get(0).text());
+      }
+      while(!desc("更多").click());
+      while(!click("删除"));
+      while(!click("删除"));
+      sleep(200);
+  }
+}
\ No newline at end of file
diff --git a/app/src/main/assets/sample/QQ与微信/批量删除朋友圈.js b/app/src/main/assets/sample/QQ与微信/批量删除朋友圈.js
new file mode 100644
index 00000000..0668b5f6
--- /dev/null
+++ b/app/src/main/assets/sample/QQ与微信/批量删除朋友圈.js
@@ -0,0 +1,29 @@
+"auto";
+
+launchApp("微信");
+sleep(500);
+while(!click("发现"));
+while(!click("朋友圈"));
+descContains("我的头像").click();
+toast("请点击要删除的朋友圈");
+
+while(true){
+    deletePost();
+    sleep(200);
+}
+
+
+function deletePost(){
+    var isPhoto = desc("更多").exists();
+    if(isPhoto){
+        desc("更多").click();
+    }
+    if(click("删除")){
+        while(!click("确定"));
+        sleep(200);
+        if(isPhoto){
+            while(!back());
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/app/src/main/assets/sample/QQ与微信/批量取关公众号.js b/app/src/main/assets/sample/QQ与微信/批量取关公众号.js
new file mode 100644
index 00000000..409b147c
--- /dev/null
+++ b/app/src/main/assets/sample/QQ与微信/批量取关公众号.js
@@ -0,0 +1,25 @@
+"auto";
+launchApp("微信");
+enterOfficialAccounts();
+sleep(200);
+toast("请点击要取关的公众号");
+while(true){
+    //点击右上角小人图标
+    desc("聊天信息").findOne().click();
+    //获取微信号并记录
+    var weChatId = textContains("微信号").findOne();
+    console.log("取关: " + weChatId.text());
+    //点击右上角三个小点儿
+    desc("更多").findOne().click();
+    while(!click("不再关注"));
+    sleep(200);
+    while(!click("不再关注"));
+    sleep(200);
+    enterOfficialAccounts();
+}
+
+//进入公众号界面
+function enterOfficialAccounts(){
+    while(!click("通讯录"));
+    while(!click("公众号"));
+}
\ No newline at end of file
diff --git a/app/src/main/assets/sample/自动操作/支付宝扫一扫.js b/app/src/main/assets/sample/QQ与微信/支付宝扫一扫.js
similarity index 100%
rename from app/src/main/assets/sample/自动操作/支付宝扫一扫.js
rename to app/src/main/assets/sample/QQ与微信/支付宝扫一扫.js
diff --git a/app/src/main/assets/sample/QQ与微信/朋友圈点赞.js b/app/src/main/assets/sample/QQ与微信/朋友圈点赞.js
new file mode 100644
index 00000000..def86b62
--- /dev/null
+++ b/app/src/main/assets/sample/QQ与微信/朋友圈点赞.js
@@ -0,0 +1,23 @@
+"auto";
+
+//下滑
+function scroll(){
+  className("ListView").scrollForward();
+}
+
+//尝试点赞
+function tryFav(btn){
+  btn.click();
+  sleep(300);
+  if(!click("赞")){
+    btn.click();
+  }
+}
+
+while(true){
+    var c = className("ImageView").desc("评论").untilFind();
+    c.each(function(btn){
+        tryFav(btn);
+    });
+    scroll();
+}
\ No newline at end of file
diff --git a/app/src/main/assets/sample/选择器/清空酷安动态.js b/app/src/main/assets/sample/其他应用/清空酷安动态.js
similarity index 100%
rename from app/src/main/assets/sample/选择器/清空酷安动态.js
rename to app/src/main/assets/sample/其他应用/清空酷安动态.js
diff --git a/app/src/main/assets/sample/其他应用/网易云音乐批量点赞.js b/app/src/main/assets/sample/其他应用/网易云音乐批量点赞.js
new file mode 100644
index 00000000..2b6209d3
--- /dev/null
+++ b/app/src/main/assets/sample/其他应用/网易云音乐批量点赞.js
@@ -0,0 +1,34 @@
+"auto";
+
+launchApp("网易云音乐");
+toast("打开一个歌曲的评论页面");
+
+//循环直至当前为评论页面
+waitActivity("com.netease.cloudmusic.activity.ResourceCommentActivity");
+
+
+while(true){
+    var list = className("ListView").findOne();
+    list.find(className("RelativeLayout")).each(function(item){
+        if(item && item.childCount() >= 3){
+            //点赞按钮
+            var fav = item.child(2);
+            if(fav){
+                //获取点赞次数
+                var favCount = parseInt(fav.text());
+                fav.click();
+                sleep(100);
+                fav.refresh();
+                //如果点了以后点赞数减少了，那么说明赞被取消了，再点一次
+                if(parseInt(fav.text()) < favCount){
+                    fav.click();
+                }
+                sleep(100);
+            }
+
+        }
+    });
+    //下滑
+    list.scrollForward();
+}
+
diff --git a/app/src/main/assets/sample/其他应用/网易云音乐签到.js b/app/src/main/assets/sample/其他应用/网易云音乐签到.js
new file mode 100644
index 00000000..f08d9875
--- /dev/null
+++ b/app/src/main/assets/sample/其他应用/网易云音乐签到.js
@@ -0,0 +1,6 @@
+"auto";
+
+launchApp("网易云音乐");
+sleep(500);
+classNameEndsWith("DrawerLayout").findOne().child(0).child(1).child(0).child(0).click();
+text("签到").className("TextView").click();
\ No newline at end of file
diff --git a/app/src/main/assets/sample/其他应用/贴吧一键签到.js b/app/src/main/assets/sample/其他应用/贴吧一键签到.js
new file mode 100644
index 00000000..5921958a
--- /dev/null
+++ b/app/src/main/assets/sample/其他应用/贴吧一键签到.js
@@ -0,0 +1,40 @@
+"auto";
+
+launchApp("百度贴吧");
+sleep(1000);
+while(!click("进吧"));
+toast("开始签到");
+var signed = {};
+
+while(true){
+    var list = id("fragment_pager").findOne().findOne(id("listview"));
+    list.children().each(function(child){
+        if(child && child.className().endsWith("RelativeLayout")){
+            if(child.childCount() > 1){
+                sign(child);
+            }
+        }
+    });
+    list.scrollForward();
+}
+
+function sign(child){
+    var li = child.child(1);
+    if(li && li.childCount() > 0){
+        var name = li.child(0).text();
+        if(signed[name]){
+            return;
+        }
+        child.click();
+        sleep(400);
+        for(var i = 0; i < 3; i ++){
+          if(click("签到")){
+            break;
+          }
+          sleep(200);
+        }
+        sleep(400);
+        while(!back());
+        signed[name] = true;
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/assets/sample/应用/强制停止应用.js b/app/src/main/assets/sample/应用/强制停止应用.js
new file mode 100644
index 00000000..22c9cfef
--- /dev/null
+++ b/app/src/main/assets/sample/应用/强制停止应用.js
@@ -0,0 +1,5 @@
+"auto";
+
+var appName = rawInput("请输入应用名称");
+openAppSetting(getPackageName(appName));
+while(!click("强制停止"));
\ No newline at end of file
diff --git a/app/src/main/assets/sample/界面/QQ强制聊天.js b/app/src/main/assets/sample/界面/QQ打开聊天窗口.js
similarity index 74%
rename from app/src/main/assets/sample/界面/QQ强制聊天.js
rename to app/src/main/assets/sample/界面/QQ打开聊天窗口.js
index e2e8b20a..3fb77bd6 100644
--- a/app/src/main/assets/sample/界面/QQ强制聊天.js
+++ b/app/src/main/assets/sample/界面/QQ打开聊天窗口.js
@@ -16,7 +16,9 @@ container.addView(btnOk);
 activity.setContentView(container);
 
 btnOk.setOnClickListener(function(view){
-    activity.startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("mqqwpa://im/chat?chat_type=wpa&uin=" + qq.getText()))
-        .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
+    app.startActivity({
+        action: "android.intent.action.VIEW",
+        data: "mqqwpa://im/chat?chat_type=wpa&uin=" + qq.getText()
+    });
     activity.finish();
 });
\ No newline at end of file
diff --git a/app/src/main/assets/sample/自动操作/打开自动运行的服务.js b/app/src/main/assets/sample/自动操作/打开自动运行的服务.js
deleted file mode 100644
index ed10722e..00000000
--- a/app/src/main/assets/sample/自动操作/打开自动运行的服务.js
+++ /dev/null
@@ -1,24 +0,0 @@
-"auto";
-
-function 打开正在运行的服务(){
-    launch("com.android.settings");
-    var i = 0;
-    while(!click("开发者选项")){
-        i++;
-        if(i == 10){
-            toast("开发者选项未开启");
-            return;
-        }
-        scrollDown();
-    }
-    while(!click("正在运行的服务"));
-}
-
-
-importClass(android.os.Build);
-
-if(Build.VERSION.SDK_INT < 23){
-    toast("本代码只适用于Android6.0以上");
-}else{
-    打开正在运行的服务();
-}
\ No newline at end of file
diff --git a/app/src/main/assets/sample/选择器/QQ图片轰炸.js b/app/src/main/assets/sample/选择器/QQ图片轰炸.js
deleted file mode 100644
index 8fa33bf5..00000000
--- a/app/src/main/assets/sample/选择器/QQ图片轰炸.js
+++ /dev/null
@@ -1,8 +0,0 @@
-"auto";
-
-launchApp("QQ");
-toast("打开一个聊天窗口，并点击下面的图片按钮");
-for(i = 0; i < 100;i++){
- className("CheckBox").untilFindOne().click();
- id("send_btn").click();
-}
\ No newline at end of file
diff --git a/app/src/main/assets/sample/选择器/批量取关公众号.js b/app/src/main/assets/sample/选择器/批量取关公众号.js
deleted file mode 100644
index 03691dc7..00000000
--- a/app/src/main/assets/sample/选择器/批量取关公众号.js
+++ /dev/null
@@ -1,15 +0,0 @@
-"auto";
-
-function 取消关注(){
-  id("af9").longClickable().longClick();
-  click("取消关注");
-  click("不再关注");
-}
-
-toast("请在10秒内打开订阅号界面");
-toast("10秒后如果没有反应请稍微滑动一下页面");
-sleep(10 * 1000);
-
-while(true){
-  取消关注();
-}
diff --git a/app/src/main/assets/sample/选择器/朋友圈点赞.js b/app/src/main/assets/sample/选择器/朋友圈点赞.js
deleted file mode 100644
index be431142..00000000
--- a/app/src/main/assets/sample/选择器/朋友圈点赞.js
+++ /dev/null
@@ -1,18 +0,0 @@
-function 下滑(){
-  className("ListView").scrollForward();
-}
-
-function 尝试点赞(btn){
-  btn.click();
-  sleep(300);
-  if(!click("赞"))
-    btn.click();
-}
-
-while(true){
-var c = className("ImageView").desc("评论").untilFind();
-c.each(function(btn){
-  尝试点赞(btn);
-});
-下滑();
-}
\ No newline at end of file
diff --git a/app/src/main/assets/sample/选择器/网易云音乐签到.js b/app/src/main/assets/sample/选择器/网易云音乐签到.js
deleted file mode 100644
index 337079c2..00000000
--- a/app/src/main/assets/sample/选择器/网易云音乐签到.js
+++ /dev/null
@@ -1,5 +0,0 @@
-"auto";
-
-launchApp("网易云音乐");
-id("kp").click();
-text("签到").className("TextView").click();
\ No newline at end of file
diff --git a/autojs/src/main/assets/modules/__general__.js b/autojs/src/main/assets/modules/__general__.js
index 20cde5a9..cd1a13af 100644
--- a/autojs/src/main/assets/modules/__general__.js
+++ b/autojs/src/main/assets/modules/__general__.js
@@ -35,4 +35,11 @@ module.exports = function(__runtime__, scope){
     scope.currentActivity = function(){
         return __runtime__.info.getLatestActivity();
     }
+
+    scope.waitActivity = function(activity, delay){
+        delay = delay || 200;
+        while(scope.currentActivity() != activity){
+            sleep(delay);
+        }
+    }
 }
\ No newline at end of file
diff --git a/autojs/src/main/java/com/stardust/autojs/runtime/api/UiSelector.java b/autojs/src/main/java/com/stardust/autojs/runtime/api/UiSelector.java
index 1eec0e08..5287963d 100644
--- a/autojs/src/main/java/com/stardust/autojs/runtime/api/UiSelector.java
+++ b/autojs/src/main/java/com/stardust/autojs/runtime/api/UiSelector.java
@@ -87,12 +87,13 @@ public class UiSelector extends UiGlobalSelector {
         mAllocator = allocator;
     }
 
+    @NonNull
     @ScriptInterface
     public UiObjectCollection find() {
         ensureAccessibilityServiceEnabled();
         if (AutomatorConfig.isUnintendedGuardEnabled() && isRunningPackageSelf()) {
             Log.d(TAG, "isSelfPackage return null");
-            return null;
+            return UiObjectCollection.EMPTY;
         }
         AccessibilityService service = mAccessibilityBridge.getService();
         if (service != null) {
@@ -101,7 +102,7 @@ public class UiSelector extends UiGlobalSelector {
                 return findOf(UiObject.createRoot(root, mAllocator));
             }
         }
-        return null;
+        return UiObjectCollection.EMPTY;
     }
 
     private void ensureAccessibilityServiceEnabled() {
@@ -123,7 +124,7 @@ public class UiSelector extends UiGlobalSelector {
                 throw new ScriptInterruptedException();
             }
             uiObjectCollection = find();
-        } while (uiObjectCollection == null || uiObjectCollection.size() == 0);
+        } while (uiObjectCollection.empty());
         return uiObjectCollection;
     }
 
@@ -132,6 +133,12 @@ public class UiSelector extends UiGlobalSelector {
         return untilFindOne();
     }
 
+    @ScriptInterface
+    public boolean exists() {
+        UiObjectCollection collection = find();
+        return collection.nonEmpty();
+    }
+
     @NonNull
     public UiObject untilFindOne() {
         UiObjectCollection collection = untilFind();
@@ -159,10 +166,6 @@ public class UiSelector extends UiGlobalSelector {
         return untilFind().performAction(action, arguments);
     }
 
-    public boolean exists() {
-        UiObjectCollection collection = find();
-        return collection != null && collection.size() > 0;
-    }
 
     @ScriptInterface
     public boolean click() {
diff --git a/automator/src/main/java/com/stardust/automator/UiObject.java b/automator/src/main/java/com/stardust/automator/UiObject.java
index 5233e0ed..cf2f74f4 100644
--- a/automator/src/main/java/com/stardust/automator/UiObject.java
+++ b/automator/src/main/java/com/stardust/automator/UiObject.java
@@ -9,6 +9,7 @@ import android.support.annotation.Nullable;
 import android.support.v4.util.Pools;
 import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat;
 import android.util.Log;
+import android.view.View;
 import android.view.accessibility.AccessibilityNodeInfo;
 
 import com.stardust.view.accessibility.AccessibilityNodeInfoAllocator;
@@ -308,10 +309,65 @@ public class UiObject extends AccessibilityNodeInfoCompat {
         return mAllocator.getParent(this);
     }
 
+
+    public boolean checkable() {
+        return isCheckable();
+    }
+
+
+    public boolean checked() {
+        return isChecked();
+    }
+
+
+    public boolean focusable() {
+        return isFocusable();
+    }
+
+
+    public boolean focused() {
+        return isFocused();
+    }
+
+
     public boolean visibleToUser() {
         return isVisibleToUser();
     }
 
+
+    public boolean accessibilityFocused() {
+        return isAccessibilityFocused();
+    }
+
+
+    public boolean selected() {
+        return isSelected();
+    }
+
+    public boolean clickable() {
+        return isClickable();
+    }
+
+
+    public boolean longClickable() {
+        return isLongClickable();
+    }
+
+
+    public boolean enabled() {
+        return isEnabled();
+    }
+
+
+    public boolean password() {
+        return isPassword();
+    }
+
+
+    public boolean scrollable() {
+        return isScrollable();
+    }
+
     @Override
     public List<AccessibilityNodeInfoCompat> findAccessibilityNodeInfosByText(String text) {
         if (mAllocator == null)
@@ -356,5 +412,4 @@ public class UiObject extends AccessibilityNodeInfoCompat {
         }
     }
 
-
 }
diff --git a/automator/src/main/java/com/stardust/automator/UiObjectCollection.java b/automator/src/main/java/com/stardust/automator/UiObjectCollection.java
index 4596ab69..e1fe6594 100644
--- a/automator/src/main/java/com/stardust/automator/UiObjectCollection.java
+++ b/automator/src/main/java/com/stardust/automator/UiObjectCollection.java
@@ -9,6 +9,7 @@ import android.view.accessibility.AccessibilityNodeInfo;
 import com.stardust.util.Consumer;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 
 import static android.support.v4.view.accessibility.AccessibilityNodeInfoCompat.*;
@@ -27,6 +28,8 @@ import static android.support.v4.view.accessibility.AccessibilityNodeInfoCompat.
 
 public class UiObjectCollection {
 
+    public static final UiObjectCollection EMPTY = UiObjectCollection.of(Collections.<UiObject>emptyList());
+
     public static UiObjectCollection ofCompat(List<AccessibilityNodeInfoCompat> list) {
         return new UiObjectCollection(UiObject.compatListToUiObjectList(list));
     }
@@ -217,4 +220,12 @@ public class UiObjectCollection {
         }
         return null;
     }
+
+    public boolean empty() {
+        return size() == 0;
+    }
+
+    public boolean nonEmpty() {
+        return size() != 0;
+    }
 }