Remove listeners in favor of lambdas

app/src/main/java/com/commit451/lifeline/sample/App.kt

@@ -4,8 +4,6 @@ import android.app.Application
 import android.widget.Toast
 
 import com.commit451.lifeline.Lifeline
-import com.commit451.lifeline.OnBackgroundedListener
-import com.commit451.lifeline.OnForegroundedListener
 
 /**
  * Here is where you would initialize [com.commit451.lifeline.Lifeline]
@@ -15,13 +13,13 @@ class App : Application() {
     override fun onCreate() {
         super.onCreate()
         Lifeline.init(this)
-        Lifeline.register(OnBackgroundedListener {
+        Lifeline.registerOnBackgroundedListener {
             Toast.makeText(this@App, "On backgrounded", Toast.LENGTH_SHORT)
                     .show()
-        })
-        Lifeline.register(OnForegroundedListener {
+        }
+        Lifeline.registerOnForegroundedListener {
             Toast.makeText(this@App, "On foregrounded", Toast.LENGTH_SHORT)
                     .show()
-        })
+        }
     }
 }

lifeline/src/main/java/com/commit451/lifeline/Lifeline.kt

@@ -93,40 +93,40 @@ object Lifeline {
      */
     fun init(application: Application) {
         lifecycleHandler = TrackedLifecycleCallbacks()
-        application.registerComponentCallbacks(BackgroundComponentCallbacks2(InternalBackgroundListener {
+        application.registerComponentCallbacks(BackgroundComponentCallbacks2({
             for (listener in onBackgroundedListeners) {
-                listener.onBackgrounded()
+                listener.invoke()
             }
         }))
         application.registerActivityLifecycleCallbacks(lifecycleHandler)
     }
 
-    fun register(listener: OnBackgroundedListener) {
+    fun registerOnBackgroundedListener(listener: OnBackgroundedListener) {
         onBackgroundedListeners.add(listener)
     }
 
-    fun unregister(listener: OnBackgroundedListener) {
+    fun unregisterOnBackgroundedListener(listener: OnBackgroundedListener) {
         onBackgroundedListeners.remove(listener)
     }
 
-    fun register(listener: OnForegroundedListener) {
+    fun registerOnForegroundedListener(listener: OnForegroundedListener) {
         onForegroundedListeners.add(listener)
     }
 
-    fun unregister(listener: OnForegroundedListener) {
+    fun unregisterOnForegroundedListener(listener: OnForegroundedListener) {
         onForegroundedListeners.remove(listener)
     }
 
     private fun lifecycleHandler(): TrackedLifecycleCallbacks {
         return lifecycleHandler ?: throw IllegalStateException("You need to call init() before accessing Lifeline")
     }
 
-    private class BackgroundComponentCallbacks2(private val listener: InternalBackgroundListener) : ComponentCallbacks2 {
+    private class BackgroundComponentCallbacks2(private val onBackgrounded: () -> Unit) : ComponentCallbacks2 {
 
         override fun onTrimMemory(level: Int) {
             if (level == ComponentCallbacks2.TRIM_MEMORY_UI_HIDDEN) {
                 // We're in the Background
-                listener.onBackgrounded()
+                onBackgrounded.invoke()
             }
         }
 
@@ -166,7 +166,7 @@ object Lifeline {
                 timeSpentOutsideApp = System.currentTimeMillis() - timeStartedPause
                 timeStartedPause = 0
                 for (listener in onForegroundedListeners) {
-                    listener.onForegrounded()
+                    listener.invoke()
                 }
             }
             currentVisibleActivityRef = WeakReference(activity)
@@ -191,3 +191,6 @@ object Lifeline {
         }
     }
 }
+
+typealias OnBackgroundedListener = () -> Unit
+typealias OnForegroundedListener = () -> Unit