SnapdragonCamera: fix screen flash on resuming

Currently preview cover will be hidden shortly after preview started,
but if the actual first frame comes late, the main screen will flash.
Register a oneshot preview callback to hide preview cover.

Change-Id: I81fabf2d97c32fc2112cf4fceef4edd0872439e2
CRs-Fixed: 889021

1 files changed, 7 insertions, 0 deletions

diff --git a/src/com/android/camera/VideoModule.java b/src/com/android/camera/VideoModule.java
index 86afd16bc..94235858d 100644
--- a/src/com/android/camera/VideoModule.java
+++ b/src/com/android/camera/VideoModule.java
@@ -1221,6 +1221,13 @@ public class VideoModule implements CameraModule,
             mCameraDevice.setPreviewDisplay(sh);
             mCameraDevice.startPreview();
             mPreviewing = true;
+            mCameraDevice.setOneShotPreviewCallback(mHandler,
+                new CameraManager.CameraPreviewDataCallback() {
+                    @Override
+                    public void onPreviewFrame(byte[] data, CameraProxy camera) {
+                        mUI.hidePreviewCover();
+                    }
+                });
             onPreviewStarted();
         } catch (Throwable ex) {
             closeCamera();