diff --git a/app/src/main/java/com/duolebo/blyrobot/MainActivity.kt b/app/src/main/java/com/duolebo/blyrobot/MainActivity.kt
index e44bc1ad247aa0bc1748b61bcd4cd71674f1d04a..624147f806a1b13b857e1474c0304ede2ad4f294 100644
--- a/app/src/main/java/com/duolebo/blyrobot/MainActivity.kt
+++ b/app/src/main/java/com/duolebo/blyrobot/MainActivity.kt
@@ -65,22 +65,39 @@ class MainActivity : AppCompatActivity(), IAppBaseCallback {
         startRobotService()
 
         startBtn.setOnClickListener{
-            startRobot()
-        }
-
-        stopBtn.setOnClickListener{
-            stopRobot()
+            toggle()
         }
         startBtn.requestFocus()
 
         requestAppList()
 
         refreshBtn.setOnClickListener{
+            this.appInfoAdapter.clear()
             requestAppList()
         }
 
     }
 
+    private fun toggle() {
+        // 暂时测试用
+        if (TaskManager.instance.isRunning) {
+            stopRobot()
+            startBtn.isEnabled = false
+            startBtn.postDelayed({
+                startBtn.isEnabled = true
+                startBtn.text = "启动"
+            }, 3000)
+        }
+        else {
+            startRobot()
+            startBtn.isEnabled = false
+            startBtn.postDelayed({
+                startBtn.isEnabled = true
+                startBtn.text = "停止"
+            }, 3000)
+        }
+    }
+
     private fun requestAppList() {
         apkInfoProtocol = GetAppInfoProtocol(this, Config.instance)
         this.dataHandler = AppBaseHandler(this)
@@ -139,7 +156,7 @@ class MainActivity : AppCompatActivity(), IAppBaseCallback {
 
     override fun onProtocolSucceed(protocol: IProtocol?) {
         if (protocol is GetAppInfoProtocol) {
-            this.appInfoData =  protocol.data
+            this.appInfoData =  protocol.data as AppInfoData
             this.appInfoAdapter.setData(appInfoData.apkInfos)
             this.appInfoAdapter.notifyDataSetChanged()
 
@@ -179,6 +196,11 @@ class MainActivity : AppCompatActivity(), IAppBaseCallback {
             this.dataList.addAll(dataList)
         }
 
+        fun clear() {
+            this.dataList.clear()
+            notifyDataSetChanged()
+        }
+
         override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
             var itemView: AppConfigListItem
             if (convertView == null) {
diff --git a/app/src/main/java/com/duolebo/blyrobot/data/Task.kt b/app/src/main/java/com/duolebo/blyrobot/data/Task.kt
index c17a661c74c41f541cc1a862bf673ecded683b78..0051aabfcf884539a4a465c8a230adeef29fd670 100644
--- a/app/src/main/java/com/duolebo/blyrobot/data/Task.kt
+++ b/app/src/main/java/com/duolebo/blyrobot/data/Task.kt
@@ -97,7 +97,12 @@ class Task : IAppBaseCallback {
 //        }
         // 频道轮询处理
         try {
-            this.processChannels()
+            val success = this.processChannels()
+            // 尝试两次
+            if (!success) {
+                this.reset()
+                this.processChannels()
+            }
             // 上传图片
             this.uploadImage()
             this.status = "4"
@@ -162,7 +167,7 @@ class Task : IAppBaseCallback {
         }
     }
 
-    private fun processChannels() {
+    private fun processChannels(): Boolean {
         Log.i(TAG, "processChannels")
         step()
         for (i in 1 until this.apkInfo.channelCount) {
@@ -170,8 +175,15 @@ class Task : IAppBaseCallback {
             this.channelIndex = i
             capture(apkInfo.captureDelay)
             AdbUtil.sendMultiKey(this.apkInfo.channelKeyEvent)
+
+            if (!AppUtil.isAppBackground(context, this.apkInfo.packageName)) {
+                return false
+            }
+
             step()
         }
+
+        return true
     }
 
     private fun step() {
diff --git a/app/src/main/java/com/duolebo/blyrobot/util/AdbUtil.kt b/app/src/main/java/com/duolebo/blyrobot/util/AdbUtil.kt
index e45d0e1c4970020747a75bb68efeb944c9033562..5ba5c826b5c950b8b4b9231fdaac6de1da56bbd4 100644
--- a/app/src/main/java/com/duolebo/blyrobot/util/AdbUtil.kt
+++ b/app/src/main/java/com/duolebo/blyrobot/util/AdbUtil.kt
@@ -205,7 +205,7 @@ object AdbUtil {
         val keyEvents = ArrayList<EmulateKey>()
         val keys = keyPath.split(Constants.SLASH)
         for (stepKey in keys) {
-            var delay = "1"
+            var delay = "2"
             if (Constants.VERTICAL_BAR in stepKey) {
                 val params = stepKey.split(Constants.VERTICAL_BAR)
                 delay = params[1]
diff --git a/app/src/main/java/com/duolebo/blyrobot/util/AppUtil.kt b/app/src/main/java/com/duolebo/blyrobot/util/AppUtil.kt
index 9e6d28a8dae4a9121dac62c7e37a23857b607759..59c28d91cbfc0a52dbfa468e6afa25081a51f6d1 100644
--- a/app/src/main/java/com/duolebo/blyrobot/util/AppUtil.kt
+++ b/app/src/main/java/com/duolebo/blyrobot/util/AppUtil.kt
@@ -1,5 +1,6 @@
 package com.duolebo.blyrobot.util
 
+import android.app.ActivityManager
 import android.content.Context
 import android.text.TextUtils
 import java.net.Inet4Address
@@ -12,6 +13,9 @@ import android.content.pm.PackageManager
 import android.os.Build
 import android.os.Environment
 import java.util.regex.Pattern
+import android.app.ActivityManager.RunningAppProcessInfo
+
+
 
 
 object AppUtil {
@@ -168,4 +172,20 @@ object AppUtil {
 
         return sdcardAbsPath
     }
+
+    fun isAppBackground(context: Context, packageName: String): Boolean {
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+            return AdbUtil.isAppActive(packageName)
+        }
+
+        val activityManager = context.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
+        val appProcesses = activityManager.runningAppProcesses
+        for (appProcess in appProcesses) {
+            if (appProcess.processName == packageName) {
+                return appProcess.importance == RunningAppProcessInfo.IMPORTANCE_BACKGROUND
+            }
+        }
+        return false
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index a5fb5244d567de09eecc68fdebaafd371d5c1498..35f10793fcb29b54024fd3305e452f7eb367446b 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -27,13 +27,6 @@
             android:layout_height="wrap_content"
             android:text="启动"/>
 
-        <Button
-            android:id="@+id/stopBtn"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_marginLeft="10dp"
-            android:text="停止"/>
-
         <Button
             android:id="@+id/refreshBtn"
             android:layout_width="wrap_content"