Merge pull request #2 from faranjit/master

added changing background color with image.

Author: mayuce

.gitignore

@@ -12,3 +12,4 @@
 /captures
 .externalNativeBuild
 .cxx
+/.idea/

imagestackviewer/build.gradle

@@ -38,6 +38,7 @@ dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
     implementation 'androidx.appcompat:appcompat:1.1.0'
     implementation 'androidx.core:core-ktx:1.3.0'
+    implementation 'androidx.palette:palette:1.0.0'
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'androidx.test.ext:junit:1.1.1'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

imagestackviewer/src/main/java/com/labters/imagestackviewer/ImageViewExtensions.kt

@@ -2,16 +2,43 @@ package com.labters.imagestackviewer
 
 import android.graphics.Bitmap
 import android.graphics.BitmapFactory
+import android.graphics.drawable.Drawable
 import android.util.Base64
 import android.widget.ImageView
+import android.widget.LinearLayout
+import androidx.core.graphics.ColorUtils
 import androidx.core.graphics.drawable.toBitmap
 import androidx.databinding.BindingAdapter
+import androidx.palette.graphics.Palette
 import com.bumptech.glide.Glide
+import com.bumptech.glide.load.DataSource
+import com.bumptech.glide.load.engine.GlideException
+import com.bumptech.glide.request.RequestListener
 import com.bumptech.glide.request.RequestOptions
+import com.bumptech.glide.request.target.Target
 import com.labters.imagestackviewer.data.ResourceType
 import java.io.ByteArrayOutputStream
 
-object ImageViewExtensions
+object ImageViewExtensions {
+
+    private const val ALPHA = 180
+
+    /**
+     * Changes the background of the image when resource is ready.
+     */
+    fun onImageReady(imageView: ImageView, resource: Drawable?) {
+        val bitmap = resource?.toBitmap()
+        bitmap?.let {
+            (imageView.parent as? LinearLayout)?.let {
+                Palette.Builder(bitmap).generate { palette ->
+                    it.setBackgroundColor(
+                        ColorUtils.setAlphaComponent(palette?.getDominantColor(0) ?: 0, ALPHA)
+                    )
+                }
+            }
+        }
+    }
+}
 
 @BindingAdapter(value = ["app:src", "app:isCenterCrop"], requireAll = false)
 fun ImageView.srcGlide(data: Any?, isCenterCrop: Boolean?) {
@@ -40,6 +67,26 @@ fun ImageView.srcGlide(data: Any?, isCenterCrop: Boolean?) {
             .with(context)
             .load(resource)
             .apply(options)
+            .addListener(object : RequestListener<Drawable> {
+                override fun onResourceReady(
+                    resource: Drawable?,
+                    model: Any?,
+                    target: Target<Drawable>?,
+                    dataSource: DataSource?,
+                    isFirstResource: Boolean
+                ): Boolean {
+                    ImageViewExtensions.onImageReady(this@srcGlide, resource)
+                    return false
+                }
+
+                override fun onLoadFailed(
+                    e: GlideException?,
+                    model: Any?,
+                    target: Target<Drawable>?,
+                    isFirstResource: Boolean
+                ): Boolean = false
+
+            })
             .into(this)
     }
 }