bitmap from image link

To retrieve a bitmap from an image link using Kotlin, you can follow these steps:

  1. Create a function to download the image from the provided link. You can use the URL class to create a URL object with the image link, and then use the openStream() method to get the input stream of the image. Next, create a BufferedInputStream object to read the input stream, and a ByteArrayOutputStream object to write the image data.

  2. Read the image data from the input stream using a buffer. You can create a byte array with a fixed size, and then use a while loop to read the data from the input stream into the buffer. Inside the loop, write the buffer data to the ByteArrayOutputStream object.

  3. Convert the byte array to a Bitmap object. Once you have the byte array with the image data, you can use the BitmapFactory class to decode the byte array and create a Bitmap object. Use the decodeByteArray() method, passing in the byte array, the starting offset, and the length of the data.

Here's an example implementation in Kotlin:

import android.graphics.Bitmap
import android.graphics.BitmapFactory
import java.io.BufferedInputStream
import java.io.ByteArrayOutputStream
import java.net.URL

fun fetchBitmapFromImageLink(imageLink: String): Bitmap {
    val url = URL(imageLink)
    val connection = url.openConnection()
    connection.doInput = true
    connection.connect()

    val inputStream = connection.getInputStream()
    val bufferedInputStream = BufferedInputStream(inputStream)
    val outputStream = ByteArrayOutputStream()

    val buffer = ByteArray(1024)
    var bytesRead: Int
    while (bufferedInputStream.read(buffer).also { bytesRead = it } != -1) {
        outputStream.write(buffer, 0, bytesRead)
    }

    val bitmapData = outputStream.toByteArray()
    return BitmapFactory.decodeByteArray(bitmapData, 0, bitmapData.size)
}

This function retrieves a bitmap from the provided image link by downloading the image, converting it to a byte array, and then decoding the byte array to create a Bitmap object.