Added color change animation on cab creation

app/src/main/java/code/name/monkey/retromusic/adapter/SongFileAdapter.kt

@@ -40,7 +40,7 @@ import kotlin.math.log10
 import kotlin.math.pow
 
 class SongFileAdapter(
-    private val activity: AppCompatActivity,
+    override val activity: AppCompatActivity,
     private var dataSet: List<File>,
     private val itemLayoutRes: Int,
     private val iCallbacks: ICallbacks?,

app/src/main/java/code/name/monkey/retromusic/adapter/album/AlbumAdapter.kt

@@ -39,7 +39,7 @@ import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import me.zhanghai.android.fastscroll.PopupTextProvider
 
 open class AlbumAdapter(
-    val activity: FragmentActivity,
+    override val activity: FragmentActivity,
     var dataSet: List<Album>,
     var itemLayoutRes: Int,
     iCabHolder: ICabHolder?,

app/src/main/java/code/name/monkey/retromusic/adapter/artist/ArtistAdapter.kt

@@ -42,7 +42,7 @@ import me.zhanghai.android.fastscroll.PopupTextProvider
 import java.util.*
 
 class ArtistAdapter(
-    val activity: FragmentActivity,
+    override val activity: FragmentActivity,
     var dataSet: List<Artist>,
     var itemLayoutRes: Int,
     val ICabHolder: ICabHolder?,

app/src/main/java/code/name/monkey/retromusic/adapter/base/AbsMultiSelectAdapter.kt

@@ -1,28 +1,44 @@
 package code.name.monkey.retromusic.adapter.base
 
-import android.content.Context
+import android.graphics.Color
 import android.view.Menu
 import android.view.MenuItem
 import androidx.annotation.MenuRes
+import androidx.fragment.app.FragmentActivity
 import androidx.recyclerview.widget.RecyclerView
 import code.name.monkey.retromusic.R
+import code.name.monkey.retromusic.extensions.surfaceColor
 import code.name.monkey.retromusic.interfaces.ICabHolder
+import code.name.monkey.retromusic.util.ColorAnimUtil
+import code.name.monkey.retromusic.util.RetroColorUtil
 import com.afollestad.materialcab.MaterialCab
 import java.util.*
 
 abstract class AbsMultiSelectAdapter<V : RecyclerView.ViewHolder?, I>(
-    context: Context, private val ICabHolder: ICabHolder?, @MenuRes menuRes: Int
+    open val activity: FragmentActivity, private val ICabHolder: ICabHolder?, @MenuRes menuRes: Int
 ) : RecyclerView.Adapter<V>(), MaterialCab.Callback {
-    private val context: Context
     private var cab: MaterialCab? = null
     private val checked: MutableList<I>
     private var menuRes: Int
     override fun onCabCreated(materialCab: MaterialCab, menu: Menu): Boolean {
+        // Animate the color change
+        ColorAnimUtil.createColorAnimator(
+            activity.surfaceColor(),
+            RetroColorUtil.shiftBackgroundColor(activity.surfaceColor())
+        ).apply {
+            addUpdateListener {
+                // Change color of status bar too
+                activity.window.statusBarColor = animatedValue as Int
+                materialCab.setBackgroundColor(animatedValue as Int)
+            }
+            start()
+        }
         return true
     }
 
     override fun onCabFinished(materialCab: MaterialCab): Boolean {
         clearChecked()
+        activity.window.statusBarColor = Color.TRANSPARENT
         return true
     }
 
@@ -31,7 +47,7 @@ abstract class AbsMultiSelectAdapter<V : RecyclerView.ViewHolder?, I>(
             checkAll()
         } else {
             onMultipleItemAction(menuItem, ArrayList(checked))
-            cab!!.finish()
+            cab?.finish()
             clearChecked()
         }
         return true
@@ -94,13 +110,13 @@ abstract class AbsMultiSelectAdapter<V : RecyclerView.ViewHolder?, I>(
             val size = checked.size
             when {
                 size <= 0 -> {
-                    cab!!.finish()
+                    cab?.finish()
                 }
                 size == 1 -> {
-                    cab!!.setTitle(getName(checked[0]))
+                    cab?.setTitle(getName(checked[0]))
                 }
                 else -> {
-                    cab!!.setTitle(context.getString(R.string.x_selected, size))
+                    cab?.setTitle(activity.getString(R.string.x_selected, size))
                 }
             }
         }
@@ -109,6 +125,5 @@ abstract class AbsMultiSelectAdapter<V : RecyclerView.ViewHolder?, I>(
     init {
         checked = ArrayList()
         this.menuRes = menuRes
-        this.context = context
     }
 }

app/src/main/java/code/name/monkey/retromusic/adapter/playlist/PlaylistAdapter.kt

@@ -41,7 +41,7 @@ import code.name.monkey.retromusic.model.Song
 import code.name.monkey.retromusic.util.MusicUtil
 
 class PlaylistAdapter(
-    private val activity: FragmentActivity,
+    override val activity: FragmentActivity,
     private var dataSet: List<PlaylistWithSongs>,
     private var itemLayoutRes: Int,
     ICabHolder: ICabHolder?,

app/src/main/java/code/name/monkey/retromusic/adapter/song/SongAdapter.kt

@@ -50,7 +50,7 @@ import me.zhanghai.android.fastscroll.PopupTextProvider
  */
 
 open class SongAdapter(
-    protected val activity: FragmentActivity,
+    override val activity: FragmentActivity,
     var dataSet: MutableList<Song>,
     protected var itemLayoutRes: Int,
     ICabHolder: ICabHolder?,

app/src/main/java/code/name/monkey/retromusic/util/ColorAnimUtil.kt

@@ -0,0 +1,19 @@
+package code.name.monkey.retromusic.util
+
+import android.animation.ArgbEvaluator
+import android.animation.ValueAnimator
+
+class ColorAnimUtil {
+    companion object {
+        fun createColorAnimator(
+            fromColor: Int,
+            toColor: Int,
+            mDuration: Long = 300
+        ): ValueAnimator {
+            return ValueAnimator.ofInt(fromColor, toColor).apply {
+                setEvaluator(ArgbEvaluator())
+                duration = mDuration
+            }
+        }
+    }
+}

app/src/main/java/code/name/monkey/retromusic/util/RetroColorUtil.java

@@ -205,6 +205,17 @@ public class RetroColorUtil {
     return color;
   }
 
+  @ColorInt
+  public static int shiftBackgroundColor(@ColorInt int backgroundColor) {
+    int color = backgroundColor;
+    if (ColorUtil.INSTANCE.isColorLight(color)) {
+      color = ColorUtil.INSTANCE.shiftColor(color, 0.5F);
+    } else {
+      color = ColorUtil.INSTANCE.shiftColor(color, 1.5F);
+    }
+    return color;
+  }
+
   private static class SwatchComparator implements Comparator<Palette.Swatch> {
 
     private static SwatchComparator sInstance;