Clear preview frame on surfaceTexture during activity pause.

CameraActivity Reloads views on filmstrip during each resume.
While reloading surface texture is destroyed and recreated.
So when user press power key to pause and unlock to resume,
till the surface texture is destroyed user see the old frame
(which was rendered before onPause). Followed by gray screen
till surface creation and start of preview. It created
filckering impact on UI. Fix here is to destroy the surfaceTexure
in onPause itself so during next resume user won't see old frame.

Change-Id: Id5c787586288de660dc6ad91f3c2ae018761ddd4
CRs-Fixed: 566255

1 files changed, 15 insertions, 0 deletions

diff --git a/src/com/android/camera/ui/FilmStripView.java b/src/com/android/camera/ui/FilmStripView.java
index 074f80b8a..d2695b5a4 100644
--- a/src/com/android/camera/ui/FilmStripView.java
+++ b/src/com/android/camera/ui/FilmStripView.java
@@ -408,6 +408,8 @@ public class FilmStripView extends ViewGroup implements BottomControlsListener {
         public void goToFilmStrip();
 
         public void goToFullScreen();
+
+        public void clearSurfaceViews();
     }
 
     /**
@@ -2330,6 +2332,19 @@ public class FilmStripView extends ViewGroup implements BottomControlsListener {
             scaleTo(1f, GEOMETRY_ADJUST_TIME_MS);
         }
 
+        @Override
+        public void clearSurfaceViews() {
+            for(ViewItem item: mViewItem) {
+                if (item == null) {
+                    continue;
+                }
+                View v = item.getView();
+                if (v != mCameraView) {
+                    removeView(v);
+                }
+            }
+        }
+
         private void cancelFlingAnimation() {
             // Cancels flinging for zoomed images
             if (isFlingAnimationRunning()) {