diff --git a/app/src/main/java/keijumt/devandroid/fragment/AsyncFragment.kt b/app/src/main/java/keijumt/devandroid/fragment/AsyncFragment.kt
index 18e24f0..871b2fc 100644
--- a/app/src/main/java/keijumt/devandroid/fragment/AsyncFragment.kt
+++ b/app/src/main/java/keijumt/devandroid/fragment/AsyncFragment.kt
@@ -1,5 +1,6 @@
 package keijumt.devandroid.fragment
 
+import android.arch.lifecycle.Observer
 import android.arch.lifecycle.ViewModelProviders
 import android.databinding.DataBindingUtil
 import android.os.Bundle
@@ -7,6 +8,7 @@
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import android.widget.Toast
 import keijumt.devandroid.R
 import keijumt.devandroid.databinding.FragmentAsyncBinding
 import keijumt.devandroid.viewmodel.AsyncViewModel
@@ -23,8 +25,14 @@
         binding = DataBindingUtil.inflate(inflater, R.layout.fragment_async, null, false)
         asyncViewModel = ViewModelProviders.of(nonNullActivity, viewModelFactory).get(AsyncViewModel::class.java)
         binding.asyncViewModel = asyncViewModel
+        subscribe()
         return binding.root
     }
 
+    fun subscribe() {
+        asyncViewModel.toastMessage.observe(this, Observer {
+            Toast.makeText(activity, it, Toast.LENGTH_SHORT).show()
+        })
+    }
 
 }
diff --git a/app/src/main/java/keijumt/devandroid/viewmodel/AsyncViewModel.kt b/app/src/main/java/keijumt/devandroid/viewmodel/AsyncViewModel.kt
index 5f45283..ed8112f 100644
--- a/app/src/main/java/keijumt/devandroid/viewmodel/AsyncViewModel.kt
+++ b/app/src/main/java/keijumt/devandroid/viewmodel/AsyncViewModel.kt
@@ -7,6 +7,7 @@
 import io.reactivex.rxkotlin.subscribeBy
 import io.reactivex.schedulers.Schedulers
 import keijumt.devandroid.common.Task
+import keijumt.devandroid.databinding.SingleLiveEvent
 import kotlinx.coroutines.experimental.android.UI
 import kotlinx.coroutines.experimental.async
 import kotlinx.coroutines.experimental.launch
@@ -14,10 +15,12 @@
 
 class AsyncViewModel @Inject constructor() : BaseViewModel() {
 
+    val toastMessage = SingleLiveEvent<String>()
+
     fun async() {
         val calc = Task(object : Task.Callback<Int> {
             override fun execute(value: Int) {
-                println("callback is ${value}")
+                toastMessage.value = "asynctask value is ${value}"
             }
         })
         calc.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR)
@@ -26,7 +29,7 @@
     fun coroutine() {
         launch(UI) {
             val result = calc(3).await() * calc(5).await()
-            println(result)
+            toastMessage.value = "coroutine processing value is ${result}"
         }
     }
 
@@ -40,7 +43,7 @@
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribeBy(
                         onSuccess = {
-                            println(it)
+                            toastMessage.value = "rxjava processing value is ${it}"
                         }
                 )
         addDisposable(disposable)