Fix startFaceDetection RuntimeException.

Sometimes startFaceDetection is called twice and exception
is thrown.

Reproduction steps:
1. Set screen lock to none.
2. Start camera app and press power key to turn off screen immediately.
3. Start camera app.

bug:5497940
Change-Id: I3337d70e473943f5306cb459ce79c0faa45b77af

1 files changed, 2 insertions, 2 deletions

diff --git a/src/com/android/camera/Camera.java b/src/com/android/camera/Camera.java
index 931095e..1bedb4f 100644
--- a/src/com/android/camera/Camera.java
+++ b/src/com/android/camera/Camera.java
@@ -1458,7 +1458,7 @@ public class Camera extends ActivityBase implements FocusManager.Listener,
                 initializeCapabilities();
                 resetExposureCompensation();
                 startPreview();
-                startFaceDetection();
+                if (mFirstTimeInitialized) startFaceDetection();
             } catch (CameraHardwareException e) {
                 Util.showErrorAndFinish(this, R.string.cannot_connect_camera);
                 return;
@@ -1682,7 +1682,7 @@ public class Camera extends ActivityBase implements FocusManager.Listener,
         // display rotation in onCreate may not be what we want.
         if (mCameraState == PREVIEW_STOPPED) {
             startPreview();
-            startFaceDetection();
+            if (mFirstTimeInitialized) startFaceDetection();
         } else {
             if (Util.getDisplayRotation(this) != mDisplayRotation) {
                 setDisplayOrientation();