Convenient context extensions for kotlin

ContextExtensions.kt

tailrec fun Context.getActivity(): Activity? = when (this) {
    is Activity -> this
    else -> (this as? ContextWrapper)?.baseContext?.getActivity()
}

/**
 * Starts the Activity [A], in a more concise way, while still allowing to configure the [Intent] in
 * the optional [configIntent] lambda.
 */
inline fun <reified A : Activity> Context.start(configIntent: Intent.() -> Unit = {}) {
    startActivity(Intent(this, A::class.java).apply(configIntent))
}

/**
 * @Description
 * Checks if device is online or not
 */
fun Context.isOnline(): Boolean {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        val connectivityManager =
            this.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        val network = connectivityManager.activeNetwork
        return if (network != null) {
            val networkCapabilities = connectivityManager.getNetworkCapabilities(network)!!
            networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)
                    || networkCapabilities.hasTransport(
                NetworkCapabilities.TRANSPORT_WIFI
            )
        } else false
    } else {
        /* Initial Value */
        var isConnected: Boolean? = false
        val connectivityManager =
            this.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        @Suppress("DEPRECATION") val activeNetwork = connectivityManager.activeNetworkInfo
        @Suppress("DEPRECATION")
        if (activeNetwork != null && activeNetwork.isConnected) {
            isConnected = true
        }
        return isConnected ?: false
    }
}

/** show "toast" message */
fun Context.toastLong(message: CharSequence) = Toast.makeText(this, message, Toast.LENGTH_LONG).show()
fun Context.toast(@StringRes stringRes: Int) = Toast.makeText(this, stringRes, Toast.LENGTH_SHORT).show()

    /**
    * converts drawable vector resource to bitmap;
    * returns nullable Bitmap (very important) 
    */
    private fun Context.vectorToBitmap(vector: Int): Bitmap? {
        val res = resources
        return BitmapFactory.decodeResource(res, vector)
    }
    
    /** converts url to SpannableString  */
    fun Context.convertPictureToSpannableString(imgRes: String): SpannableString {
    val spannableString = SpannableString(" ")
        val url = URL(imgRes)
        Thread {
            val image: Bitmap = BitmapFactory.decodeStream(url.openConnection().getInputStream())
            val imageSpan = ImageSpan(this, image)
            spannableString.setSpan(imageSpan, " ".length - 1, " ".length, 0)
        }.start()
    return spannableString
}