Use extracted color for scrim in overview mode.

Change-Id: Ia24dbf69a64cb0b84da9985a5dd78ca699e7bed1

src/com/android/launcher3/dragndrop/DragLayer.java

@@ -27,6 +27,7 @@ import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Rect;
 import android.graphics.Region;
+import android.support.v4.graphics.ColorUtils;
 import android.util.AttributeSet;
 import android.view.KeyEvent;
 import android.view.LayoutInflater;
@@ -54,6 +55,7 @@ import com.android.launcher3.ShortcutAndWidgetContainer;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.allapps.AllAppsTransitionController;
 import com.android.launcher3.config.FeatureFlags;
+import com.android.launcher3.dynamicui.WallpaperColorInfo;
 import com.android.launcher3.folder.Folder;
 import com.android.launcher3.folder.FolderIcon;
 import com.android.launcher3.keyboard.ViewGroupFocusHelper;
@@ -73,9 +75,6 @@ public class DragLayer extends InsettableFrameLayout {
     public static final int ANIMATION_END_DISAPPEAR = 0;
     public static final int ANIMATION_END_REMAIN_VISIBLE = 2;
 
-    // Scrim color without any alpha component.
-    private static final int SCRIM_COLOR = Color.BLACK & 0x00FFFFFF;
-
     private final int[] mTmpXY = new int[2];
 
     @Thunk DragController mDragController;
@@ -108,6 +107,7 @@ public class DragLayer extends InsettableFrameLayout {
     // Related to adjacent page hints
     private final Rect mScrollChildPosition = new Rect();
     private final ViewGroupFocusHelper mFocusIndicatorHelper;
+    private final WallpaperColorInfo mWallpaperColorInfo;
 
     // Related to pinch-to-go-to-overview gesture.
     private PinchToOverviewListener mPinchListener = null;
@@ -131,6 +131,7 @@ public class DragLayer extends InsettableFrameLayout {
 
         mIsRtl = Utilities.isRtl(getResources());
         mFocusIndicatorHelper = new ViewGroupFocusHelper(this);
+        mWallpaperColorInfo = WallpaperColorInfo.getInstance(getContext());
     }
 
     public void setup(Launcher launcher, DragController dragController,
@@ -878,7 +879,10 @@ public class DragLayer extends InsettableFrameLayout {
                 getDescendantRectRelativeToSelf(currCellLayout, mHighlightRect);
                 canvas.clipRect(mHighlightRect, Region.Op.DIFFERENCE);
             }
-            canvas.drawColor((alpha << 24) | SCRIM_COLOR);
+            // for super light wallpaper it needs to be darken for contrast to workspace
+            // for dark wallpapers the text is white so darkening works as well
+            int color = ColorUtils.compositeColors(0x66000000, mWallpaperColorInfo.getMainColor());
+            canvas.drawColor(ColorUtils.setAlphaComponent(color, alpha));
             canvas.restore();
         }