commit 0d880c876b4f6392176bed29d230418c970aa9c0
author Tracy Zhou <tracyzhou@google.com> Tue May 12 14:43:44 2020 -0700
committer Tracy Zhou <tracyzhou@google.com> Tue May 12 14:43:44 2020 -0700
tree 9661d6f8d7bb8c1d92703ec7d8a26f9c3ef3e79a
parent 42de4ddc83680d488169e4950aed1c4a9e460ed1

Fade in grid preview

Fixes: 156406762
Test: https://drive.google.com/open?id=1JshUMjd1ASjHcAhnAiG3PEC-6wCRY7EE
Change-Id: I6a99650796fe64a6c11ee9fad6904b14373c6363

src/com/android/launcher3/graphics/PreviewSurfaceRenderer.java

diff --git a/src/com/android/launcher3/graphics/PreviewSurfaceRenderer.java b/src/com/android/launcher3/graphics/PreviewSurfaceRenderer.java
index 20eec9a..c62f308 100644
--- a/src/com/android/launcher3/graphics/PreviewSurfaceRenderer.java
+++ b/src/com/android/launcher3/graphics/PreviewSurfaceRenderer.java
@@ -29,6 +29,7 @@
 import android.view.Display;
 import android.view.SurfaceControlViewHost;
 import android.view.View;
+import android.view.animation.AccelerateDecelerateInterpolator;
 
 import com.android.launcher3.InvariantDeviceProfile;
 
@@ -37,6 +38,8 @@
 /** Render preview using surface view. */
 public class PreviewSurfaceRenderer implements IBinder.DeathRecipient {
 
+    private static final int FADE_IN_ANIMATION_DURATION = 200;
+
     private static final String KEY_HOST_TOKEN = "host_token";
     private static final String KEY_VIEW_WIDTH = "width";
     private static final String KEY_VIEW_HEIGHT = "height";
@@ -99,6 +102,11 @@
             view.setPivotY(0);
             view.setTranslationX((mWidth - scale * view.getWidth()) / 2);
             view.setTranslationY((mHeight - scale * view.getHeight()) / 2);
+            view.setAlpha(0);
+            view.animate().alpha(1)
+                    .setInterpolator(new AccelerateDecelerateInterpolator())
+                    .setDuration(FADE_IN_ANIMATION_DURATION)
+                    .start();
             mSurfaceControlViewHost.setView(view, view.getMeasuredWidth(),
                     view.getMeasuredHeight());
         });