shared view model implemented

app/build.gradle

@@ -8,12 +8,19 @@ android {
     compileSdkVersion 28
     defaultConfig {
         applicationId "ninja.shuza.sharedviewmodel"
-        minSdkVersion 16
+        minSdkVersion 19
         targetSdkVersion 28
         versionCode 1
         versionName "1.0"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+
+        javaCompileOptions {
+            annotationProcessorOptions {
+                includeCompileClasspath false
+            }
+        }
     }
+
     buildTypes {
         release {
             minifyEnabled false
@@ -25,12 +32,17 @@ android {
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
-    implementation 'com.android.support:appcompat-v7:28.0.0-rc01'
+    implementation "org.jetbrains.anko:anko:$anko_version"
+    implementation 'com.android.support:appcompat-v7:28.0.0-beta01'
     implementation 'com.android.support.constraint:constraint-layout:1.1.2'
-    implementation 'com.android.support:support-v4:28.0.0-rc01'
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'com.android.support.test:runner:1.0.2'
     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
 
-    implementation "org.jetbrains.anko:anko:$anko_version"
+    implementation 'android.arch.work:work-runtime:1.0.0-alpha06'
+    implementation 'android.arch.lifecycle:extensions:1.0.0'
+    implementation 'android.arch.lifecycle:compiler:1.0.0'
+
+    annotationProcessor 'android.arch.persistence.room:runtime:1.0.0'
+    annotationProcessor 'android.arch.persistence.room:compiler:1.0.0'
 }

app/src/main/java/ninja/shuza/sharedviewmodel/InputFragment.kt

@@ -1,5 +1,7 @@
 package ninja.shuza.sharedviewmodel
 
+import android.arch.lifecycle.ViewModelProviders
+import android.content.Context
 import android.os.Bundle
 import android.support.v4.app.Fragment
 import android.text.Editable
@@ -8,7 +10,6 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import kotlinx.android.synthetic.main.fragment_input.*
-import org.jetbrains.anko.db.INTEGER
 
 /**
  *
@@ -23,13 +24,20 @@ import org.jetbrains.anko.db.INTEGER
 
 class InputFragment : Fragment() {
 
-    var activityListener: Communicator? = null
+    private var sharedViewModel: SharedViewModel? = null
 
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
         return inflater.inflate(R.layout.fragment_input, container, false)
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        activity?.let {
+            /**
+             *  create view model in activity scope
+             */
+            sharedViewModel = ViewModelProviders.of(it).get(SharedViewModel::class.java)
+        }
+
         et_input.addTextChangedListener(object : TextWatcher {
             override fun afterTextChanged(p0: Editable?) {}
 
@@ -42,7 +50,7 @@ class InputFragment : Fragment() {
                         input = txt.toString().toInt()
                     }
 
-                    activityListener?.passData(input)
+                    sharedViewModel?.inputNumber?.postValue(input)
                 }
             }
         })

app/src/main/java/ninja/shuza/sharedviewmodel/MainActivity.kt

@@ -1,32 +1,29 @@
 package ninja.shuza.sharedviewmodel
 
+import android.arch.lifecycle.Observer
+import android.arch.lifecycle.ViewModelProviders
 import android.support.v7.app.AppCompatActivity
 import android.os.Bundle
 import kotlinx.android.synthetic.main.activity_main.*
 import kotlin.properties.Delegates
 
-class MainActivity : AppCompatActivity(), Communicator {
-
-    private var inputFrgament: InputFragment by Delegates.notNull()
-    private var outputFragment: OutputFragment by Delegates.notNull()
+class MainActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
 
-        inputFrgament = InputFragment()
-        inputFrgament.activityListener = this
-        outputFragment = OutputFragment()
-
+        supportFragmentManager.beginTransaction().add(R.id.layout_top, InputFragment()).commit()
+        supportFragmentManager.beginTransaction().add(R.id.layout_bottom, OutputFragment()).commit()
 
-        supportFragmentManager.beginTransaction().add(R.id.layout_top, inputFrgament).commit()
-        supportFragmentManager.beginTransaction().add(R.id.layout_bottom, outputFragment).commit()
-    }
-
-    override fun passData(number: Int) {
         val message = resources.getString(R.string.show_input)
-        tv_show_input.text = "$message  $number"
 
-        outputFragment.passDataToAnotherFragment(number)
+        val sharedViewModel = ViewModelProviders.of(this).get(SharedViewModel::class.java)
+
+        sharedViewModel.inputNumber.observe(this, Observer {
+            it?.let {
+                tv_show_input.text = "$message  $it"
+            }
+        })
     }
 }

app/src/main/java/ninja/shuza/sharedviewmodel/OutputFragment.kt

@@ -1,5 +1,7 @@
 package ninja.shuza.sharedviewmodel
 
+import android.arch.lifecycle.Observer
+import android.arch.lifecycle.ViewModelProviders
 import android.os.Bundle
 import android.support.v4.app.Fragment
 import android.view.LayoutInflater
@@ -24,12 +26,22 @@ class OutputFragment : Fragment() {
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        /**
+         *  create view model in activity scope
+         */
+        activity?.let {
+            val sharedViewModel = ViewModelProviders.of(it).get(SharedViewModel::class.java)
 
+            observeInput(sharedViewModel)
+        }
     }
 
-    fun passDataToAnotherFragment(input: Int) {
-        val message = resources.getString(R.string.result)
-        tv_output.text = "2 x $input  =  ${input*2}"
+    private fun observeInput(sharedViewModel: SharedViewModel) {
+        sharedViewModel.inputNumber.observe(this, Observer {
+            it?.let {
+                tv_output.text = "2 x $it  =  ${2 * it}"
+            }
+        })
     }
 
 }

app/src/main/java/ninja/shuza/sharedviewmodel/SharedViewModel.kt

@@ -0,0 +1,19 @@
+package ninja.shuza.sharedviewmodel
+
+import android.arch.lifecycle.MutableLiveData
+import android.arch.lifecycle.ViewModel
+
+/**
+ *
+ * :=  created by:  Shuza
+ * :=  create date:  09-Aug-18
+ * :=  (C) CopyRight Shuza
+ * :=  www.shuza.ninja
+ * :=  shuza.sa@gmail.com
+ * :=  Fun  :  Coffee  :  Code
+ *
+ **/
+
+class SharedViewModel:ViewModel(){
+    val inputNumber = MutableLiveData<Int>()
+}

app/src/main/res/layout/fragment_input.xml

@@ -11,7 +11,8 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:hint="@string/input_hint"
-        android:inputType="numberDecimal"
+        android:inputType="numberSigned"
+        android:maxLength="4"
         android:maxLines="1" />
 
 </LinearLayout>