#2 feat: Lifecycle logger

app/build.gradle

@@ -47,4 +47,6 @@ dependencies {
     testImplementation 'junit:junit:4.+'
     androidTestImplementation 'androidx.test.ext:junit:1.1.2'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+
+    implementation 'android.arch.lifecycle:extensions:1.1.1'
 }

app/src/main/java/com/siba/baseclass/BaseActivity.kt

@@ -1,16 +1,33 @@
 package com.siba.baseclass
 
 import android.os.Bundle
+import android.util.Log
 import androidx.annotation.LayoutRes
 import androidx.appcompat.app.AppCompatActivity
 import androidx.databinding.DataBindingUtil
 import androidx.databinding.ViewDataBinding
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleObserver
+import androidx.lifecycle.OnLifecycleEvent
 
 abstract class BaseActivity<T : ViewDataBinding>(@LayoutRes private val layoutResId: Int) : AppCompatActivity() {
     protected lateinit var binding: T
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         binding = DataBindingUtil.setContentView(this, layoutResId)
+        LifeCycleEventLogger().registerLogger(lifecycle)
+    }
+
+    private inner class LifeCycleEventLogger : LifecycleObserver {
+        fun registerLogger(lifecycle: Lifecycle) {
+            lifecycle.addObserver(this)
+        }
+
+        @OnLifecycleEvent(Lifecycle.Event.ON_ANY)
+        fun log() {
+            Log.d("LifeCycleEvent", "${lifecycle.currentState}")
+        }
+
     }
 }

app/src/main/java/com/siba/baseclass/MainActivity.kt

@@ -1,11 +1,11 @@
 package com.siba.baseclass
 
-import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import com.siba.baseclass.databinding.ActivityMainBinding
 
-class MainActivity : AppCompatActivity() {
+class MainActivity : BaseActivity<ActivityMainBinding>(R.layout.activity_main) {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_main)
+        binding.tvHello.text = "Hello"
     }
 }

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

@@ -1,18 +1,21 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<layout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    tools:context=".MainActivity">
+    xmlns:tools="http://schemas.android.com/tools">
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        tools:context=".MainActivity">
 
-    <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" />
+        <TextView
+            android:id="@+id/tv_hello"
+            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" />
 
-</androidx.constraintlayout.widget.ConstraintLayout>
+    </androidx.constraintlayout.widget.ConstraintLayout>
+</layout>