Fix linter warnings

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

src/main/java/com/owncloud/android/ui/activity/FileDisplayActivity.java

@@ -1505,7 +1505,7 @@ public class FileDisplayActivity extends FileActivity
                         // TODO what about other kind of previews?
                     }
                 }
-                getListOfFilesFragment().setLoading(Boolean.FALSE);
+                getListOfFilesFragment().setLoading(false);
             } finally {
                 if (intent != null) {
                     removeStickyBroadcast(intent);
@@ -2218,7 +2218,7 @@ public class FileDisplayActivity extends FileActivity
                                         null
                                 );
 
-                                getListOfFilesFragment().setLoading(Boolean.TRUE);
+                                getListOfFilesFragment().setLoading(true);
 
                                 setBackgroundText();
 

src/main/java/com/owncloud/android/ui/activity/FolderPickerActivity.java

@@ -28,7 +28,6 @@ import android.content.IntentFilter;
 import android.content.res.ColorStateList;
 import android.content.res.Resources.NotFoundException;
 import android.graphics.PorterDuff;
-import android.graphics.drawable.Drawable;
 import android.os.Bundle;
 import android.os.Parcelable;
 import android.util.Log;
@@ -69,7 +68,6 @@ import javax.inject.Inject;
 
 import androidx.appcompat.app.ActionBar;
 import androidx.fragment.app.Fragment;
-import androidx.fragment.app.FragmentManager;
 import androidx.fragment.app.FragmentTransaction;
 
 import static com.owncloud.android.utils.DisplayUtils.openSortingOrderDialogFragment;
@@ -264,7 +262,7 @@ public class FolderPickerActivity extends FileActivity implements FileFragment.C
                                                                             getApplicationContext());
 
         refreshFolderOperation.execute(getAccount(), this, null, null);
-        getListOfFilesFragment().setLoading(Boolean.TRUE);
+        getListOfFilesFragment().setLoading(true);
         setBackgroundText();
     }
 

src/main/java/com/owncloud/android/ui/adapter/OCFileListAdapter.java

@@ -56,7 +56,6 @@ import com.elyeproj.loaderviewlibrary.LoaderImageView;
 import com.nextcloud.client.account.User;
 import com.nextcloud.client.account.UserAccountManager;
 import com.nextcloud.client.preferences.AppPreferences;
-import com.owncloud.android.MainApp;
 import com.owncloud.android.R;
 import com.owncloud.android.datamodel.FileDataStorageManager;
 import com.owncloud.android.datamodel.OCFile;
@@ -741,7 +740,7 @@ public class OCFileListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHol
 
         try {
             final Point screenSize = getScreenSize(thumbnailShimmer.getContext());
-            final int marginLeftAndRight = Math.round(targetLayoutParams.leftMargin + targetLayoutParams.rightMargin);
+            final int marginLeftAndRight = targetLayoutParams.leftMargin + targetLayoutParams.rightMargin;
             final int size = Math.round(screenSize.x / gridColumns - marginLeftAndRight);
 
             FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(size, size);

src/main/java/com/owncloud/android/ui/asynctasks/PhotoSearchTask.java

@@ -116,7 +116,7 @@ public class PhotoSearchTask extends AsyncTask<Void, Void, RemoteOperationResult
                 }
             }
 
-            photoFragment.setLoading(Boolean.FALSE);
+            photoFragment.setLoading(false);
 
             if (!result.isSuccess() && !isCancelled()) {
                 photoFragment.setEmptyListMessage(ExtendedListFragment.SearchType.PHOTO_SEARCH);

src/main/java/com/owncloud/android/ui/fragment/ExtendedListFragment.java

@@ -178,7 +178,7 @@ public class ExtendedListFragment extends Fragment implements
         return mFabMain;
     }
 
-    public void setLoading(Boolean enabled) {
+    public void setLoading(boolean enabled) {
         mRefreshListLayout.setRefreshing(enabled);
     }
 

src/main/java/com/owncloud/android/ui/fragment/OCFileListFragment.java

@@ -1625,7 +1625,7 @@ public class OCFileListFragment extends ExtendedListFragment implements
                                 @Override
                                 public void run() {
                                     if (fileDisplayActivity != null) {
-                                        setLoading(Boolean.FALSE);
+                                        setLoading(false);
                                     }
                                 }
                             });