Kotlin Extensions for simpler, easier and funw way of launching of Activities

ActivitiesLaunchingWay.kt

/**
 * Kotlin Extensions for simpler, easier and funw way
 * of launching of Activities
 */

inline fun <reified T : Any> Activity.launchActivity (
        requestCode: Int = -1,
        options: Bundle? = null,
        noinline init: Intent.() -> Unit = {}) 
{
    val intent = newIntent<T>(this)
    intent.init()
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) 
    {
        startActivityForResult(intent, requestCode, options)
    } else {
        startActivityForResult(intent, requestCode)
    }
}

inline fun <reified T : Any> Context.launchActivity (
        options: Bundle? = null,
        noinline init: Intent.() -> Unit = {}) 
{
    val intent = newIntent<T>(this)
    intent.init()
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) 
    {
        startActivity(intent, options)
    } else {
        startActivity(intent)
    }
}

inline fun <reified T : Any> newIntent(context: Context): Intent =
        Intent(context, T::class.java)

Example.kt

// Simple Activities
launchActivity<UserDetailActivity>()

// Add Intent extras
launchActivity<UserDetailActivity> {
    putExtra(INTENT_USER_ID, user.id)
}

// Add custom flags
launchActivity<UserDetailActivity> {
    putExtra(INTENT_USER_ID, user.id)
    addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
}

// Add Shared Transistions
val options = ActivityOptionsCompat.makeSceneTransitionAnimation(this, avatar, "avatar")
launchActivity<UserDetailActivity>(options = options) {
    putExtra(INTENT_USER_ID, user.id)
}

// Add requestCode for startActivityForResult() call
launchActivity<UserDetailActivity>(requestCode = 1234) {
    putExtra(INTENT_USER_ID, user.id)
}