Do not allow switching to other activities during panorama capture. (do not merge)

bug:5541182
Change-Id: I1cdbba9a8aec3b5c832f6e58baa26ff6312cf59a
diff --git a/src/com/android/camera/panorama/PanoramaActivity.java b/src/com/android/camera/panorama/PanoramaActivity.java
index 1a5a5aa..02816f4 100755
--- a/src/com/android/camera/panorama/PanoramaActivity.java
+++ b/src/com/android/camera/panorama/PanoramaActivity.java
@@ -62,6 +62,7 @@
 import android.util.Log;
 import android.view.Gravity;
 import android.view.Menu;
+import android.view.MenuItem;
 import android.view.OrientationEventListener;
 import android.view.View;
 import android.view.ViewGroup;
@@ -235,6 +236,20 @@
         return true;
     }
 
+    @Override
+    public boolean onPrepareOptionsMenu(Menu menu) {
+        super.onPrepareOptionsMenu(menu);
+        // Only show the menu when idle.
+        boolean idle = (mCaptureState == CAPTURE_STATE_VIEWFINDER && !mThreadRunning);
+        for (int i = 0; i < menu.size(); i++) {
+            MenuItem item = menu.getItem(i);
+            item.setVisible(idle);
+            item.setEnabled(idle);
+        }
+
+        return true;
+    }
+
     private void addBaseMenuItems(Menu menu) {
         MenuHelper.addSwitchModeMenuItem(menu, ModePicker.MODE_CAMERA, new Runnable() {
             public void run() {