LifecycleCallbacksEx.kt

import android.app.Activity
import android.app.Application
import android.content.Context
import android.os.Bundle
import android.support.v4.app.Fragment
import android.support.v4.app.FragmentManager
import android.view.View

fun Application.registerActivityLifecycleCallbacks(
        onActivityPaused: ((Activity) -> Unit?)? = null,
        onActivityResumed: ((Activity) -> Unit?)? = null,
        onActivityStarted: ((Activity) -> Unit?)? = null,
        onActivityDestroyed: ((Activity) -> Unit?)? = null,
        onActivitySaveInstanceState: ((Activity, Bundle?) -> Unit?)? = null,
        onActivityStopped: ((Activity) -> Unit?)? = null,
        onActivityCreated: ((Activity, Bundle?) -> Unit?)? = null
): Application.ActivityLifecycleCallbacks {
    val callbacks = object : Application.ActivityLifecycleCallbacks {

        override fun onActivityPaused(activity: Activity) {
            onActivityPaused?.invoke(activity)
        }

        override fun onActivityResumed(activity: Activity) {
            onActivityResumed?.invoke(activity)
        }

        override fun onActivityStarted(activity: Activity) {
            onActivityStarted?.invoke(activity)
        }

        override fun onActivityDestroyed(activity: Activity) {
            onActivityDestroyed?.invoke(activity)
        }

        override fun onActivitySaveInstanceState(activity: Activity, bundle: Bundle?) {
            onActivitySaveInstanceState?.invoke(activity, bundle)
        }

        override fun onActivityStopped(activity: Activity) {
            onActivityStopped?.invoke(activity)
        }

        override fun onActivityCreated(activity: Activity, bundle: Bundle?) {
            onActivityCreated?.invoke(activity, bundle)
        }

    }
    this.registerActivityLifecycleCallbacks(callbacks)
    return callbacks
}

fun FragmentManager.registerFragmentLifecycleCallbacks(
        recursive: Boolean = true,
        onFragmentViewCreated: ((fm: FragmentManager, f: Fragment, v: View?, savedInstanceState: Bundle?) -> Unit?)? = null,
        onFragmentStopped: ((fm: FragmentManager, f: Fragment) -> Unit?)? = null,
        onFragmentCreated: ((fm: FragmentManager, f: Fragment, savedInstanceState: Bundle?) -> Unit?)? = null,
        onFragmentResumed: ((fm: FragmentManager, f: Fragment) -> Unit?)? = null,
        onFragmentAttached: ((fm: FragmentManager, f: Fragment, context: Context) -> Unit?)? = null,
        onFragmentPreAttached: ((fm: FragmentManager, f: Fragment, context: Context) -> Unit?)? = null,
        onFragmentDestroyed: ((fm: FragmentManager, f: Fragment) -> Unit?)? = null,
        onFragmentSaveInstanceState: ((fm: FragmentManager, f: Fragment, outState: Bundle?) -> Unit?)? = null,
        onFragmentStarted: ((fm: FragmentManager, f: Fragment) -> Unit?)? = null,
        onFragmentViewDestroyed: ((fm: FragmentManager, f: Fragment) -> Unit?)? = null,
        onFragmentPreCreated: ((fm: FragmentManager, f: Fragment, savedInstanceState: Bundle?) -> Unit?)? = null,
        onFragmentActivityCreated: ((fm: FragmentManager, f: Fragment, savedInstanceState: Bundle?) -> Unit?)? = null,
        onFragmentPaused: ((fm: FragmentManager, f: Fragment) -> Unit?)? = null,
        onFragmentDetached: ((fm: FragmentManager, f: Fragment) -> Unit?)? = null
): FragmentManager.FragmentLifecycleCallbacks {
    val callbacks = object : FragmentManager.FragmentLifecycleCallbacks() {
        override fun onFragmentViewCreated(fm: FragmentManager, f: Fragment, v: View?, savedInstanceState: Bundle?) {
            onFragmentViewCreated?.invoke(fm, f, v, savedInstanceState)
        }

        override fun onFragmentStopped(fm: FragmentManager, f: Fragment) {
            onFragmentStopped?.invoke(fm, f)
        }

        override fun onFragmentCreated(fm: FragmentManager, f: Fragment, savedInstanceState: Bundle?) {
            onFragmentCreated?.invoke(fm, f, savedInstanceState)
        }

        override fun onFragmentResumed(fm: FragmentManager, f: Fragment) {
            onFragmentResumed?.invoke(fm, f)
        }

        override fun onFragmentAttached(fm: FragmentManager, f: Fragment, context: Context) {
            onFragmentAttached?.invoke(fm, f, context)
        }

        override fun onFragmentPreAttached(fm: FragmentManager, f: Fragment, context: Context) {
            onFragmentPreAttached?.invoke(fm, f, context)
        }

        override fun onFragmentDestroyed(fm: FragmentManager, f: Fragment) {
            onFragmentDestroyed?.invoke(fm, f)
        }

        override fun onFragmentSaveInstanceState(fm: FragmentManager, f: Fragment, outState: Bundle?) {
            onFragmentSaveInstanceState?.invoke(fm, f, outState)
        }

        override fun onFragmentStarted(fm: FragmentManager, f: Fragment) {
            onFragmentStarted?.invoke(fm, f)
        }

        override fun onFragmentViewDestroyed(fm: FragmentManager, f: Fragment) {
            onFragmentViewDestroyed?.invoke(fm, f)
        }

        override fun onFragmentPreCreated(fm: FragmentManager, f: Fragment, savedInstanceState: Bundle?) {
            onFragmentPreCreated?.invoke(fm, f, savedInstanceState)
        }

        override fun onFragmentActivityCreated(fm: FragmentManager, f: Fragment, savedInstanceState: Bundle?) {
            onFragmentActivityCreated?.invoke(fm, f, savedInstanceState)
        }

        override fun onFragmentPaused(fm: FragmentManager, f: Fragment) {
            onFragmentPaused?.invoke(fm, f)
        }

        override fun onFragmentDetached(fm: FragmentManager, f: Fragment) {
            onFragmentDetached?.invoke(fm, f)
        }
    }
    this.registerFragmentLifecycleCallbacks(callbacks, recursive)
    return callbacks
}