diff --git a/app/build.gradle b/app/build.gradle
index 53c0c3c..27ef2da 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -8,7 +8,7 @@ android {
     compileSdkVersion 28
     defaultConfig {
         applicationId "luyao.ktx"
-        minSdkVersion 15
+        minSdkVersion 16
         targetSdkVersion 28
         versionCode 1
         versionName "1.0"
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index fb81bfe..98678d8 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -9,13 +9,14 @@
             android:roundIcon="@mipmap/ic_launcher_round"
             android:supportsRtl="true"
             android:theme="@style/AppTheme">
-        <activity android:name=".MainActivity">
+        <activity android:name="luyao.util.ktx.MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
 
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
+        <activity android:name="luyao.util.ktx.mvvm.MvvmActivity"/>
     </application>
 
 </manifest>
\ No newline at end of file
diff --git a/app/src/main/java/luyao/ktx/MainActivity.kt b/app/src/main/java/luyao/ktx/MainActivity.kt
deleted file mode 100644
index a0c3d30..0000000
--- a/app/src/main/java/luyao/ktx/MainActivity.kt
+++ /dev/null
@@ -1,12 +0,0 @@
-package luyao.ktx
-
-import androidx.appcompat.app.AppCompatActivity
-import android.os.Bundle
-
-class MainActivity : AppCompatActivity() {
-
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_main)
-    }
-}
diff --git a/app/src/main/java/luyao/util/ktx/MainActivity.kt b/app/src/main/java/luyao/util/ktx/MainActivity.kt
new file mode 100644
index 0000000..8d5d6be
--- /dev/null
+++ b/app/src/main/java/luyao/util/ktx/MainActivity.kt
@@ -0,0 +1,17 @@
+package luyao.util.ktx
+
+import kotlinx.android.synthetic.main.activity_main.*
+import luyao.ktx.R
+import luyao.ktx.base.BaseActivity
+import luyao.util.ktx.mvvm.MvvmActivity
+
+class MainActivity : BaseActivity() {
+
+    override fun getLayoutResId() = R.layout.activity_main
+
+    override fun initView() {}
+
+    override fun initData() {
+        btMvvm.setOnClickListener { startActivity(MvvmActivity::class.java) }
+    }
+}
diff --git a/app/src/main/java/luyao/util/ktx/mvvm/MvvmActivity.kt b/app/src/main/java/luyao/util/ktx/mvvm/MvvmActivity.kt
new file mode 100644
index 0000000..a0b5f1b
--- /dev/null
+++ b/app/src/main/java/luyao/util/ktx/mvvm/MvvmActivity.kt
@@ -0,0 +1,37 @@
+package luyao.util.ktx.mvvm
+
+import androidx.lifecycle.LifecycleOwner
+import androidx.lifecycle.Observer
+import kotlinx.android.synthetic.main.activity_mvvm_demo.*
+import luyao.ktx.R
+import luyao.ktx.base.BaseVMActivity
+import luyao.ktx.ext.toast
+
+/**
+ * Created by luyao
+ * on 2019/5/31 16:28
+ */
+class MvvmActivity : BaseVMActivity<MvvmModel>(), LifecycleOwner {
+
+    override fun providerVMClass() = MvvmModel::class.java
+
+    override fun getLayoutResId() = R.layout.activity_mvvm_demo
+
+    override fun initView() {
+        mvvm.setOnClickListener { mViewModel.getMessage() }
+    }
+
+    override fun initData() {
+
+    }
+
+    override fun startObserve() {
+        mViewModel.run {
+            mMessage.observe(this@MvvmActivity, Observer {
+                it?.run {
+                    toast(it)
+                }
+            })
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/luyao/util/ktx/mvvm/MvvmModel.kt b/app/src/main/java/luyao/util/ktx/mvvm/MvvmModel.kt
new file mode 100644
index 0000000..6145d1a
--- /dev/null
+++ b/app/src/main/java/luyao/util/ktx/mvvm/MvvmModel.kt
@@ -0,0 +1,29 @@
+package luyao.util.ktx.mvvm
+
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleOwner
+import androidx.lifecycle.MutableLiveData
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.async
+import kotlinx.coroutines.delay
+import luyao.ktx.base.BaseViewModel
+
+/**
+ * Created by luyao
+ * on 2019/5/31 16:28
+ */
+class MvvmModel : BaseViewModel() {
+
+    val mMessage: MutableLiveData<String> = MutableLiveData()
+
+    fun getMessage() {
+
+        launch {
+            val deferred = async(Dispatchers.IO) {
+                delay(2000) // network request
+                "success"
+            }
+            mMessage.value = deferred.await()
+        }
+    }
+}
\ 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 716af5a..cb3836b 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,19 +1,17 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout
+<LinearLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:tools="http://schemas.android.com/tools"
-        xmlns:app="http://schemas.android.com/apk/res-auto"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        tools:context=".MainActivity">
+        tools:context="luyao.util.ktx.MainActivity"
+        android:orientation="vertical"
+        android:gravity="center_horizontal">
 
-    <TextView
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:text="Hello World!"
-            app:layout_constraintBottom_toBottomOf="parent"
-            app:layout_constraintLeft_toLeftOf="parent"
-            app:layout_constraintRight_toRightOf="parent"
-            app:layout_constraintTop_toTopOf="parent"/>
+    <Button
+            android:id="@+id/btMvvm"
+            android:layout_width="100dp"
+            android:layout_height="50dp"
+            android:text="MVVM"/>
 
-</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
+</LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_mvvm_demo.xml b/app/src/main/res/layout/activity_mvvm_demo.xml
new file mode 100644
index 0000000..57b7b19
--- /dev/null
+++ b/app/src/main/res/layout/activity_mvvm_demo.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                android:orientation="vertical"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent">
+
+
+    <Button
+            android:id="@+id/mvvm"
+            android:layout_width="100dp"
+            android:layout_height="80dp"
+            android:layout_centerInParent="true"
+            android:text="Click"/>
+
+</RelativeLayout>
\ No newline at end of file
diff --git a/library/build.gradle b/library/build.gradle
index 076c98e..ea5a065 100644
--- a/library/build.gradle
+++ b/library/build.gradle
@@ -1,4 +1,6 @@
 apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android-extensions'
+apply plugin: 'kotlin-android'
 
 android {
     compileSdkVersion 28
@@ -30,4 +32,15 @@ dependencies {
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'androidx.test:runner:1.1.1'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
+    api "androidx.core:core-ktx:1.2.0-alpha01"
+    api "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    api 'com.afollestad.material-dialogs:core:3.0.0-beta2'
+    api "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.1.1"
+    api "androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0-alpha01"
+    api 'androidx.lifecycle:lifecycle-extensions:2.2.0-alpha01'
+
+}
+
+repositories {
+    mavenCentral()
 }
diff --git a/library/src/main/AndroidManifest.xml b/library/src/main/AndroidManifest.xml
index adcf326..ef98331 100644
--- a/library/src/main/AndroidManifest.xml
+++ b/library/src/main/AndroidManifest.xml
@@ -1,2 +1,2 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-          package="luyao.util.ktx"/>
+          package="luyao.ktx"/>
diff --git a/library/src/main/java/luyao/ktx/base/BaseActivity.kt b/library/src/main/java/luyao/ktx/base/BaseActivity.kt
new file mode 100644
index 0000000..88b28db
--- /dev/null
+++ b/library/src/main/java/luyao/ktx/base/BaseActivity.kt
@@ -0,0 +1,34 @@
+package luyao.ktx.base
+
+import android.content.Intent
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+
+/**
+ * Created by luyao
+ * on 2019/5/31 15:44
+ */
+abstract class BaseActivity : AppCompatActivity() {
+
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(getLayoutResId())
+        initView()
+//        setSupportActionBar(mToolbar)
+        initData()
+    }
+
+    abstract fun getLayoutResId(): Int
+    abstract fun initView()
+    abstract fun initData()
+
+    protected fun startActivity(z: Class<*>) {
+        startActivity(Intent(this, z))
+    }
+
+    protected fun startActivity(z: Class<*>, name: String, value: Boolean) {
+        val intent = Intent(this, z).putExtra(name, value)
+        startActivity(intent)
+    }
+}
\ No newline at end of file
diff --git a/library/src/main/java/luyao/ktx/base/BaseVMActivity.kt b/library/src/main/java/luyao/ktx/base/BaseVMActivity.kt
new file mode 100644
index 0000000..6a7bb7a
--- /dev/null
+++ b/library/src/main/java/luyao/ktx/base/BaseVMActivity.kt
@@ -0,0 +1,39 @@
+package luyao.ktx.base
+
+import android.os.Bundle
+import androidx.lifecycle.LifecycleObserver
+import androidx.lifecycle.ViewModelProviders
+
+/**
+ * Created by luyao
+ * on 2019/5/31 16:16
+ */
+abstract class BaseVMActivity<VM : BaseViewModel> : BaseActivity(),LifecycleObserver {
+
+    lateinit var mViewModel: VM
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        initVM()
+        super.onCreate(savedInstanceState)
+        startObserve()
+    }
+
+    private fun initVM() {
+        providerVMClass()?.let {
+            mViewModel = ViewModelProviders.of(this).get(it)
+            mViewModel.let(lifecycle::addObserver)
+        }
+    }
+
+    open fun providerVMClass(): Class<VM>? = null
+
+
+    open fun startObserve() {}
+
+    override fun onDestroy() {
+        mViewModel.let {
+            lifecycle.removeObserver(it)
+        }
+        super.onDestroy()
+    }
+}
\ No newline at end of file
diff --git a/library/src/main/java/luyao/ktx/base/BaseViewModel.kt b/library/src/main/java/luyao/ktx/base/BaseViewModel.kt
new file mode 100644
index 0000000..1e0d3c3
--- /dev/null
+++ b/library/src/main/java/luyao/ktx/base/BaseViewModel.kt
@@ -0,0 +1,76 @@
+package luyao.ktx.base
+
+import androidx.lifecycle.LifecycleObserver
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.*
+
+/**
+ * Created by luyao
+ * on 2019/5/31 16:06
+ */
+open class BaseViewModel : ViewModel(), LifecycleObserver {
+
+    private val mException: MutableLiveData<Exception> = MutableLiveData()
+
+
+    private fun launchOnUI(block: suspend CoroutineScope.() -> Unit) {
+
+        viewModelScope.launch { block() }
+
+    }
+
+    suspend fun <T> launchIO(block: suspend CoroutineScope.() -> T) {
+        withContext(Dispatchers.IO) {
+            block
+        }
+    }
+
+    fun launch(tryBlock: suspend CoroutineScope.() -> Unit) {
+        launchOnUI {
+            tryCatch(tryBlock, {}, {}, true)
+        }
+    }
+
+
+    fun launchOnUITryCatch(tryBlock: suspend CoroutineScope.() -> Unit,
+                           catchBlock: suspend CoroutineScope.(Throwable) -> Unit,
+                           finallyBlock: suspend CoroutineScope.() -> Unit,
+                           handleCancellationExceptionManually: Boolean
+    ) {
+        launchOnUI {
+            tryCatch(tryBlock, catchBlock, finallyBlock, handleCancellationExceptionManually)
+        }
+    }
+
+    fun launchOnUITryCatch(tryBlock: suspend CoroutineScope.() -> Unit,
+                           handleCancellationExceptionManually: Boolean = false
+    ) {
+        launchOnUI {
+            tryCatch(tryBlock, {}, {}, handleCancellationExceptionManually)
+        }
+    }
+
+
+    private suspend fun tryCatch(
+        tryBlock: suspend CoroutineScope.() -> Unit,
+        catchBlock: suspend CoroutineScope.(Throwable) -> Unit,
+        finallyBlock: suspend CoroutineScope.() -> Unit,
+        handleCancellationExceptionManually: Boolean = false) {
+        coroutineScope {
+            try {
+                tryBlock()
+            } catch (e: Exception) {
+                if (e !is CancellationException || handleCancellationExceptionManually) {
+                    mException.value = e
+                    catchBlock(e)
+                } else {
+                    throw e
+                }
+            } finally {
+                finallyBlock()
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/library/src/main/java/luyao/ktx/ext/ContextExt.kt b/library/src/main/java/luyao/ktx/ext/ContextExt.kt
new file mode 100644
index 0000000..3f545a7
--- /dev/null
+++ b/library/src/main/java/luyao/ktx/ext/ContextExt.kt
@@ -0,0 +1,27 @@
+package luyao.ktx.ext
+
+import android.content.Context
+import android.widget.Toast
+import androidx.annotation.StringRes
+
+/**
+ * Created by luyao
+ * on 2019/5/31 16:42
+ */
+
+var showToast: Toast? = null
+
+fun Context.toast(content: String, duration: Int = Toast.LENGTH_SHORT) {
+    showToast?.apply {
+        setText(content)
+        show()
+    } ?: run {
+        Toast.makeText(this.applicationContext, content, Toast.LENGTH_SHORT).apply {
+            showToast = this
+        }.show()
+    }
+}
+
+fun Context.toast(@StringRes id: Int, duration: Int = Toast.LENGTH_SHORT) {
+    toast(getString(id), duration)
+}