如何在Kotlin中调整图像文件的大小

Question

My app takes photos and saves them inside the cellphone, however when my list loads many photos it becomes very slow, that is why I need to lower the resolution to the photos. How can I do that?

This is how I create the picture

fun createImage():File{
        val timeStamp = SimpleDateFormat("yyyyMMdd_HHmmss").format(Date())
        val imageName = "JPEG_"+timeStamp+"_"
        var storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES)
        var image = File.createTempFile(imageName,".jpg",storageDir)

        currentPath=image.absolutePath
        return image
    }

This is how I load the picture

  var beerPhoto: ImageView?=null
  ....
  viewHolder.beerPhoto?.setImageURI(Uri.parse(userDto.beerPhoto))

Answer 1

You can use glide to resize your image and scaling purposes it's pretty much easier

GlideApp  
    .with(context)
    .load(userDto.beerPhoto)
    .override(600, 200)  // it don't maintain aspect ratio 
    .into(beerPhoto);

To maintain aspect ratio you can use explicitly scale images

GlideApp  
    .with(context)
    .load(userDto.beerPhoto)
    .override(600, 200)
    .centerCrop() // or use fitcenter
    .into(beerPhoto);

Answer 2

Please use Glide for load images from server and resize it . It's very easy and useful for you I think .

Please check below link for more detail for resize image

https://guides.codepath.com/android/Displaying-Images-with-the-Glide-Library

repositories {

mavenCentral()

google()

}

dependencies

{ implementation 'com.github.bumptech.glide:glide:4.9.0'

annotationProcessor 'com.github.bumptech.glide:compiler:4.9.0' }