Its almost working!

mastodon/src/main/java/org/joinmastodon/android/model/Status.java

@@ -58,6 +58,8 @@ public class Status extends BaseModel implements DisplayItemsParent{
 	public boolean bookmarked;
 	public boolean pinned;
 
+	public boolean filterRevealed = false;
+
 	public transient boolean spoilerRevealed;
 	public transient boolean hasGapAfter;
 	private transient String strippedText;

mastodon/src/main/java/org/joinmastodon/android/ui/displayitems/StatusDisplayItem.java

@@ -8,6 +8,7 @@ import android.view.View;
 import android.view.ViewGroup;
 
 import org.joinmastodon.android.R;
+import org.joinmastodon.android.api.session.AccountSession;
 import org.joinmastodon.android.api.session.AccountSessionManager;
 import org.joinmastodon.android.fragments.BaseStatusListFragment;
 import org.joinmastodon.android.fragments.HashtagTimelineFragment;
@@ -19,6 +20,7 @@ import org.joinmastodon.android.fragments.ThreadFragment;
 import org.joinmastodon.android.model.Account;
 import org.joinmastodon.android.model.Attachment;
 import org.joinmastodon.android.model.DisplayItemsParent;
+import org.joinmastodon.android.model.Filter;
 import org.joinmastodon.android.model.Hashtag;
 import org.joinmastodon.android.model.Notification;
 import org.joinmastodon.android.model.Poll;
@@ -26,6 +28,7 @@ import org.joinmastodon.android.model.ScheduledStatus;
 import org.joinmastodon.android.model.Status;
 import org.joinmastodon.android.ui.PhotoLayoutHelper;
 import org.joinmastodon.android.ui.text.HtmlParser;
+import org.joinmastodon.android.utils.StatusFilterPredicate;
 import org.parceler.Parcels;
 
 import java.util.ArrayList;
@@ -78,6 +81,7 @@ public abstract class StatusDisplayItem{
 			case ACCOUNT -> new AccountStatusDisplayItem.Holder(activity, parent);
 			case HASHTAG -> new HashtagStatusDisplayItem.Holder(activity, parent);
 			case GAP -> new GapStatusDisplayItem.Holder(activity, parent);
+			case WARNING -> new WarningFilteredStatusDisplayItem.Holder(activity, parent);
 			case EXTENDED_FOOTER -> new ExtendedFooterStatusDisplayItem.Holder(activity, parent);
 		};
 	}
@@ -126,6 +130,15 @@ public abstract class StatusDisplayItem{
 							}
 					)));
 		}
+
+		List<Filter> filters=AccountSessionManager.getInstance().getAccount(accountID).wordFilters.stream().filter(f->f.context.contains(Filter.FilterContext.HOME)).collect(Collectors.toList());
+		StatusFilterPredicate filterPredicate = new StatusFilterPredicate(filters);
+		if(!filterPredicate.testWithWarning(status)){
+			if(!status.filterRevealed){
+				items.add(new WarningFilteredStatusDisplayItem(parentID, fragment, status));
+				return items;
+			}
+		}
 		HeaderStatusDisplayItem header;
 		items.add(header=new HeaderStatusDisplayItem(parentID, statusForContent.account, statusForContent.createdAt, fragment, accountID, statusForContent, null, notification, scheduledStatus));
 		if(!TextUtils.isEmpty(statusForContent.content))
@@ -196,6 +209,7 @@ public abstract class StatusDisplayItem{
 		ACCOUNT,
 		HASHTAG,
 		GAP,
+		WARNING,
 		EXTENDED_FOOTER
 	}
 

mastodon/src/main/java/org/joinmastodon/android/ui/displayitems/WarningFilteredStatusDisplayItem.java

@@ -0,0 +1,51 @@
+package org.joinmastodon.android.ui.displayitems;
+
+import android.content.Context;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ProgressBar;
+import android.widget.TextView;
+
+import org.joinmastodon.android.R;
+import org.joinmastodon.android.fragments.BaseStatusListFragment;
+import org.joinmastodon.android.model.Status;
+import org.joinmastodon.android.ui.drawables.SawtoothTearDrawable;
+
+// Mind the gap!
+public class WarningFilteredStatusDisplayItem extends StatusDisplayItem{
+    public boolean loading;
+    public final Status status;
+
+    public WarningFilteredStatusDisplayItem(String parentID, BaseStatusListFragment parentFragment, Status status){
+        super(parentID, parentFragment);
+        this.status=status;
+    }
+
+    @Override
+    public Type getType(){
+        return Type.WARNING;
+    }
+
+    public static class Holder extends StatusDisplayItem.Holder<WarningFilteredStatusDisplayItem>{
+        public final ProgressBar progress;
+        public final TextView text;
+
+        public Holder(Context context, ViewGroup parent){
+            super(context, R.layout.display_item_warning, parent);
+            progress=findViewById(R.id.progress);
+            text=findViewById(R.id.text);
+//            itemView.setForeground(new SawtoothTearDrawable(context));
+        }
+
+        @Override
+        public void onBind(WarningFilteredStatusDisplayItem item){
+            text.setVisibility(item.loading ? View.GONE : View.VISIBLE);
+        }
+
+        @Override
+        public void onClick(){
+            item.status.filterRevealed = true;
+//            item.parentFragment.onGapClick(this);
+        }
+    }
+}

mastodon/src/main/java/org/joinmastodon/android/utils/StatusFilterPredicate.java

@@ -38,4 +38,22 @@ public class StatusFilterPredicate implements Predicate<Status>{
 		}
 		return true;
 	}
+
+	public boolean testWithWarning(Status status) {
+		if(status.filtered!=null){
+			if (status.filtered.isEmpty()){
+				return true;
+			}
+			boolean matches=status.filtered.stream()
+					.map(filterResult->filterResult.filter)
+					.filter(filter->filter.expiresAt==null||filter.expiresAt.isAfter(Instant.now()))
+					.anyMatch(filter->filter.filterAction==Filter.FilterAction.WARN);
+			return !matches;
+		}
+		for(Filter filter:filters){
+			if(filter.matches(status))
+				return false;
+		}
+		return true;
+	}
 }

mastodon/src/main/res/layout/display_item_warning.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="75dp"
+    android:background="@drawable/bg_timeline_gap">
+
+    <TextView
+        android:id="@+id/text"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_vertical"
+        android:gravity="center_horizontal"
+        android:textAppearance="@style/m3_body_large"
+        android:textColor="?android:textColorSecondary"
+        android:text="@string/load_missing_posts"/>
+
+    <ProgressBar
+        android:id="@+id/progress"
+        android:layout_width="32dp"
+        android:layout_height="32dp"
+        android:layout_gravity="center"
+        android:visibility="gone"/>
+
+</FrameLayout>