Screen becomes blank while swiping left using following codes.Bad bugs?

The following code can be worked

``` xml

```

But when I remove

``` xml
android:layout_gravity="center"
```

at LinearLayout node,screen becomes blank.At the same time, if I change

``` xml
android:layout_gravity="left"
```

at ImageView node like this:

``` xml
android:layout_gravity="right"
```

It works well. Is this a bug?