增加程序前台判断逻辑，修复启动问题

app/src/main/java/com/duolebo/blyrobot/MainActivity.kt

@@ -71,6 +71,7 @@ class MainActivity : AppCompatActivity(), IAppBaseCallback {
 
         requestAppList()
 
+        refreshBtn.isEnabled = true
         refreshBtn.setOnClickListener{
             this.appInfoAdapter.clear()
             requestAppList()
@@ -86,6 +87,7 @@ class MainActivity : AppCompatActivity(), IAppBaseCallback {
             startBtn.postDelayed({
                 startBtn.isEnabled = true
                 startBtn.text = "启动"
+                refreshBtn.isEnabled = true
             }, 3000)
         }
         else {
@@ -94,7 +96,8 @@ class MainActivity : AppCompatActivity(), IAppBaseCallback {
             startBtn.postDelayed({
                 startBtn.isEnabled = true
                 startBtn.text = "停止"
-            }, 3000)
+                refreshBtn.isEnabled = false
+            }, 2000)
         }
     }