Load image from url in notification Android

Question

In my android application, i want to set Notification icons dynamically which will be loaded from URL. For that, i have used setLargeIcon property of Notificati

Answer 1

Top answer in Kotlin and with Coroutines. This method applies the bitmap to the builder instead of a direct assignment, and of course if bitmap available. It's nice because if the url is wrong it will be caught in the try/catch.

fun applyImageUrl(
    builder: NotificationCompat.Builder, 
    imageUrl: String
) = runBlocking {
    val url = URL(imageUrl)

    withContext(Dispatchers.IO) {
        try {
            val input = url.openStream()
            BitmapFactory.decodeStream(input)
        } catch (e: IOException) {
            null
        }
    }?.let { bitmap ->
        builder.setLargeIcon(bitmap)
    }
}

with Kotlin & RxJava

fun applyImageUrl(
    builder: NotificationCompat.Builder,
    imageUrl: String
) {
    val url = URL(imageUrl)

    Single.create { emitter ->
        try {
            val input = url.openStream()
            val bitmap = BitmapFactory.decodeStream(input)
            emitter.onSuccess(bitmap)
        } catch (e: Exception) {
            emitter.onError(e)
        }
    }.subscribeOn(Schedulers.io())
        .observeOn(AndroidSchedulers.mainThread())
        .subscribe(
            {
                builder.setLargeIcon(it)
            }, {
                Timber.e("error generating bitmap for notification")
            }
        )
}