Optimize imports

Signed-off-by: alperozturk <alper_ozturk@proton.me>

app/src/main/java/com/owncloud/android/ui/preview/PreviewImageActivity.java

@@ -21,7 +21,6 @@ import android.content.IntentFilter;
 import android.os.Bundle;
 import android.view.MenuItem;
 import android.view.View;
-import android.view.ViewGroup;
 
 import com.nextcloud.client.account.User;
 import com.nextcloud.client.di.Injectable;
@@ -52,8 +51,6 @@ import com.owncloud.android.ui.fragment.OCFileListFragment;
 import com.owncloud.android.utils.MimeTypeUtil;
 
 import java.io.Serializable;
-import java.util.ArrayList;
-import java.util.List;
 import java.util.Optional;
 
 import javax.inject.Inject;
@@ -62,7 +59,6 @@ import androidx.annotation.NonNull;
 import androidx.appcompat.app.ActionBar;
 import androidx.drawerlayout.widget.DrawerLayout;
 import androidx.localbroadcastmanager.content.LocalBroadcastManager;
-import androidx.recyclerview.widget.RecyclerView;
 import androidx.viewpager2.widget.ViewPager2;
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 

app/src/main/java/com/owncloud/android/ui/preview/PreviewImagePagerAdapter.kt

@@ -129,7 +129,7 @@ class PreviewImagePagerAdapter : FragmentStateAdapter {
      */
     fun getFileAt(position: Int): OCFile? {
         return try {
-            imageFiles!![position]
+            imageFiles[position]
         } catch (exception: IndexOutOfBoundsException) {
             null
         }