Merge pull request #1 from jariztia/master

Case the Activity gets killed by the OS while it's in the background

src/android/com/phonegap/plugins/barcodescanner/BarcodeScanner.java

@@ -15,6 +15,7 @@
 import android.Manifest;
 import android.app.Activity;
 import android.content.Intent;
+import android.os.Bundle;
 import android.util.Log;
 import android.content.pm.PackageManager;
 
@@ -302,4 +303,13 @@ public void onRequestPermissionResult(int requestCode, String[] permissions,
        }
    }
 
+    /**
+     * This plugin launches an external Activity when the camera is opened, so we
+     * need to implement the save/restore API in case the Activity gets killed
+     * by the OS while it's in the background.
+     */
+    public void onRestoreStateForActivityResult(Bundle state, CallbackContext callbackContext) {
+        this.callbackContext = callbackContext;
+    }
+
 }