implement fetching listings from remote instances

mastodon/src/main/java/org/joinmastodon/android/GlobalUserPreferences.java

@@ -48,6 +48,7 @@ public class GlobalUserPreferences{
 	public static boolean replyLineAboveHeader;
 	public static boolean compactReblogReplyLine;
 	public static boolean confirmBeforeReblog;
+	public static boolean allowRemoteLoading;
 	public static String publishButtonText;
 	public static ThemePreference theme;
 	public static ColorPreference color;
@@ -127,6 +128,7 @@ public class GlobalUserPreferences{
 		replyVisibility=prefs.getString("replyVisibility", null);
 		accountsWithContentTypesEnabled=prefs.getStringSet("accountsWithContentTypesEnabled", new HashSet<>());
 		accountsDefaultContentTypes=fromJson(prefs.getString("accountsDefaultContentTypes", null), accountsDefaultContentTypesType, new HashMap<>());
+		allowRemoteLoading=prefs.getBoolean("allowRemoteLoading", true);
 
 		try {
 			color=ColorPreference.valueOf(prefs.getString("color", ColorPreference.PINK.name()));
@@ -176,6 +178,7 @@ public class GlobalUserPreferences{
 				.putString("replyVisibility", replyVisibility)
 				.putStringSet("accountsWithContentTypesEnabled", accountsWithContentTypesEnabled)
 				.putString("accountsDefaultContentTypes", gson.toJson(accountsDefaultContentTypes))
+				.putBoolean("allowRemoteLoading", allowRemoteLoading)
 				.apply();
 	}
 

mastodon/src/main/java/org/joinmastodon/android/api/MastodonAPIRequest.java

@@ -20,9 +20,11 @@ import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.function.Consumer;
 
 import androidx.annotation.CallSuper;
+import androidx.annotation.Nullable;
 import androidx.annotation.StringRes;
 import me.grishka.appkit.api.APIRequest;
 import me.grishka.appkit.api.Callback;
@@ -44,7 +46,7 @@ public abstract class MastodonAPIRequest<T> extends APIRequest<T>{
 	TypeToken<T> respTypeToken;
 	Call okhttpCall;
 	Token token;
-	boolean canceled;
+	boolean canceled, isRemote;
 	Map<String, String> headers;
 	private ProgressDialog progressDialog;
 	protected boolean removeUnsupportedItems;
@@ -101,6 +103,21 @@ public abstract class MastodonAPIRequest<T> extends APIRequest<T>{
 		return this;
 	}
 
+	public MastodonAPIRequest<T> execRemote(String domain) {
+		return execRemote(domain, null);
+	}
+
+	public MastodonAPIRequest<T> execRemote(String domain, @Nullable AccountSession remoteSession) {
+		this.isRemote = true;
+		return Optional.ofNullable(remoteSession)
+				.or(() -> AccountSessionManager.getInstance().getLoggedInAccounts().stream()
+						.filter(acc -> acc.domain.equals(domain))
+						.findAny())
+				.map(AccountSession::getID)
+				.map(this::exec)
+				.orElse(this.execNoAuth(domain));
+	}
+
 	public MastodonAPIRequest<T> wrapProgress(Activity activity, @StringRes int message, boolean cancelable){
 		return wrapProgress(activity, message, cancelable, null);
 	}
@@ -167,6 +184,7 @@ public abstract class MastodonAPIRequest<T> extends APIRequest<T>{
 	@CallSuper
 	public void validateAndPostprocessResponse(T respObj, Response httpResponse) throws IOException{
 		if(respObj instanceof BaseModel){
+			((BaseModel) respObj).isRemote = isRemote;
 			((BaseModel) respObj).postprocess();
 		}else if(respObj instanceof List){
 			if(removeUnsupportedItems){
@@ -175,6 +193,7 @@ public abstract class MastodonAPIRequest<T> extends APIRequest<T>{
 					Object item=itr.next();
 					if(item instanceof BaseModel){
 						try{
+							((BaseModel) item).isRemote = isRemote;
 							((BaseModel) item).postprocess();
 						}catch(ObjectValidationException x){
 							Log.w(TAG, "Removing invalid object from list", x);
@@ -182,15 +201,20 @@ public abstract class MastodonAPIRequest<T> extends APIRequest<T>{
 						}
 					}
 				}
+				// no idea why we're post-processing twice, but well, as long
+				// as upstream does it like this, i don't wanna break anything
 				for(Object item:((List<?>) respObj)){
 					if(item instanceof BaseModel){
+						((BaseModel) item).isRemote = isRemote;
 						((BaseModel) item).postprocess();
 					}
 				}
 			}else{
 				for(Object item:((List<?>) respObj)){
-					if(item instanceof BaseModel)
+					if(item instanceof BaseModel) {
+						((BaseModel) item).isRemote = isRemote;
 						((BaseModel) item).postprocess();
+					}
 				}
 			}
 		}

mastodon/src/main/java/org/joinmastodon/android/api/requests/accounts/GetAccountByHandle.java

@@ -0,0 +1,15 @@
+package org.joinmastodon.android.api.requests.accounts;
+
+import org.joinmastodon.android.api.MastodonAPIRequest;
+import org.joinmastodon.android.model.Account;
+
+public class GetAccountByHandle extends MastodonAPIRequest<Account>{
+    /**
+     * note that this method usually only returns a result if the instance already knows about an
+     * account - so it makes sense for looking up local users, search might be preferred otherwise
+     */
+    public GetAccountByHandle(String acct){
+        super(HttpMethod.GET, "/accounts/lookup", Account.class);
+        addQueryParameter("acct", acct);
+    }
+}

mastodon/src/main/java/org/joinmastodon/android/api/session/AccountSessionManager.java

@@ -160,6 +160,11 @@ public class AccountSessionManager{
 		return sessions.get(id);
 	}
 
+	@Nullable
+	public AccountSession tryGetAccount(Account account) {
+		return sessions.get(account.getDomainFromURL() + "_" + account.id);
+	}
+
 	@Nullable
 	public AccountSession getLastActiveAccount(){
 		if(sessions.isEmpty() || lastActiveAccountID==null)

mastodon/src/main/java/org/joinmastodon/android/fragments/ProfileFragment.java

@@ -45,6 +45,7 @@ import android.widget.Toolbar;
 
 import org.joinmastodon.android.GlobalUserPreferences;
 import org.joinmastodon.android.R;
+import org.joinmastodon.android.api.MastodonErrorResponse;
 import org.joinmastodon.android.api.requests.accounts.GetAccountByID;
 import org.joinmastodon.android.api.requests.accounts.GetAccountRelationships;
 import org.joinmastodon.android.api.requests.accounts.GetAccountStatuses;
@@ -137,7 +138,7 @@ public class ProfileFragment extends LoaderFragment implements OnBackPressedList
 	private TextView followsYouView;
 	private ViewGroup rolesView;
 
-	private Account account;
+	private Account account, remoteAccount;
 	private String accountID;
 	private String domain;
 	private Relationship relationship;
@@ -176,7 +177,11 @@ public class ProfileFragment extends LoaderFragment implements OnBackPressedList
 
 		accountID=getArguments().getString("account");
 		domain=AccountSessionManager.getInstance().getAccount(accountID).domain;
-		if(getArguments().containsKey("profileAccount")){
+		if (getArguments().containsKey("remoteAccount")) {
+			remoteAccount = Parcels.unwrap(getArguments().getParcelable("remoteAccount"));
+			if(!getArguments().getBoolean("noAutoLoad", false))
+				loadData();
+		} else if(getArguments().containsKey("profileAccount")){
 			account=Parcels.unwrap(getArguments().getParcelable("profileAccount"));
 			profileAccountID=account.id;
 			isOwnProfile=AccountSessionManager.getInstance().isSelf(accountID, account);
@@ -347,36 +352,55 @@ public class ProfileFragment extends LoaderFragment implements OnBackPressedList
 		return sizeWrapper;
 	}
 
+	private void onAccountLoaded(Account result) {
+		account=result;
+		isOwnProfile=AccountSessionManager.getInstance().isSelf(accountID, account);
+		bindHeaderView();
+		dataLoaded();
+		if(!tabLayoutMediator.isAttached())
+			tabLayoutMediator.attach();
+		if(!isOwnProfile)
+			loadRelationship();
+		else
+			AccountSessionManager.getInstance().updateAccountInfo(accountID, account);
+		if(refreshing){
+			refreshing=false;
+			refreshLayout.setRefreshing(false);
+			if(postsFragment.loaded)
+				postsFragment.onRefresh();
+			if(postsWithRepliesFragment.loaded)
+				postsWithRepliesFragment.onRefresh();
+			if(pinnedPostsFragment.loaded)
+				pinnedPostsFragment.onRefresh();
+			if(mediaFragment.loaded)
+				mediaFragment.onRefresh();
+		}
+		V.setVisibilityAnimated(fab, View.VISIBLE);
+	}
+
 	@Override
 	protected void doLoadData(){
+		if (remoteAccount != null) {
+			UiUtils.lookupAccountHandle(getContext(), accountID, remoteAccount.getFullyQualifiedName(), (c, args) -> {
+				if (getContext() == null) return;
+				if (args == null || !args.containsKey("profileAccount")) {
+					onError(new MastodonErrorResponse(
+							getContext().getString(R.string.sk_error_loading_profile),
+							0, null
+					));
+					return;
+				}
+				onAccountLoaded(Parcels.unwrap(args.getParcelable("profileAccount")));
+			});
+			return;
+		}
+
 		currentRequest=new GetAccountByID(profileAccountID)
 				.setCallback(new SimpleCallback<>(this){
 					@Override
 					public void onSuccess(Account result){
 						if (getActivity() == null) return;
-						account=result;
+						onAccountLoaded(result);
-						isOwnProfile=AccountSessionManager.getInstance().isSelf(accountID, account);
-						bindHeaderView();
-						dataLoaded();
-						if(!tabLayoutMediator.isAttached())
-							tabLayoutMediator.attach();
-						if(!isOwnProfile)
-							loadRelationship();
-						else
-							AccountSessionManager.getInstance().updateAccountInfo(accountID, account);
-						if(refreshing){
-							refreshing=false;
-							refreshLayout.setRefreshing(false);
-							if(postsFragment.loaded)
-								postsFragment.onRefresh();
-							if(postsWithRepliesFragment.loaded)
-								postsWithRepliesFragment.onRefresh();
-							if(pinnedPostsFragment.loaded)
-								pinnedPostsFragment.onRefresh();
-							if(mediaFragment.loaded)
-								mediaFragment.onRefresh();
-						}
-						V.setVisibilityAnimated(fab, View.VISIBLE);
 					}
 				})
 				.exec(accountID);
@@ -490,9 +514,9 @@ public class ProfileFragment extends LoaderFragment implements OnBackPressedList
 		ViewImageLoader.load(avatar, null, new UrlImageLoaderRequest(GlobalUserPreferences.playGifs ? account.avatar : account.avatarStatic, V.dp(100), V.dp(100)));
 		ViewImageLoader.load(cover, null, new UrlImageLoaderRequest(GlobalUserPreferences.playGifs ? account.header : account.headerStatic, 1000, 1000));
 		SpannableStringBuilder ssb=new SpannableStringBuilder(account.displayName);
-		HtmlParser.parseCustomEmoji(ssb, account.emojis);
+			HtmlParser.parseCustomEmoji(ssb, account.emojis);
-		name.setText(ssb);
+			name.setText(ssb);
-		setTitle(ssb);
+			setTitle(ssb);
 
 		if (account.roles != null && !account.roles.isEmpty()) {
 			rolesView.setVisibility(View.VISIBLE);
@@ -511,13 +535,12 @@ public class ProfileFragment extends LoaderFragment implements OnBackPressedList
 
 		boolean isSelf=AccountSessionManager.getInstance().isSelf(accountID, account);
 
+		String acct = ((isSelf || account.isRemote)
+					? account.getFullyQualifiedName()
+					: account.acct);
 		if(account.locked){
 			ssb=new SpannableStringBuilder("@");
-			ssb.append(account.acct);
+			ssb.append(acct);
-			if(isSelf){
-				ssb.append('@');
-				ssb.append(domain);
-			}
 			ssb.append(" ");
 			Drawable lock=username.getResources().getDrawable(R.drawable.ic_lock, getActivity().getTheme()).mutate();
 			lock.setBounds(0, 0, lock.getIntrinsicWidth(), lock.getIntrinsicHeight());
@@ -526,7 +549,7 @@ public class ProfileFragment extends LoaderFragment implements OnBackPressedList
 			username.setText(ssb);
 		}else{
 			// noinspection SetTextI18n
-			username.setText('@'+account.acct+(isSelf ? ('@'+domain) : ""));
+			username.setText('@'+acct);
 		}
 		CharSequence parsedBio=HtmlParser.parse(account.note, account.emojis, Collections.emptyList(), Collections.emptyList(), accountID);
 		if(TextUtils.isEmpty(parsedBio)){

mastodon/src/main/java/org/joinmastodon/android/fragments/SettingsFragment.java

@@ -219,6 +219,11 @@ public class SettingsFragment extends MastodonToolbarFragment implements Provide
 			GlobalUserPreferences.confirmBeforeReblog=i.checked;
 			GlobalUserPreferences.save();
 		}));
+		items.add(new SwitchItem(R.string.sk_settings_allow_remote_loading, R.drawable.ic_fluent_communication_24_regular, GlobalUserPreferences.allowRemoteLoading, i->{
+			GlobalUserPreferences.allowRemoteLoading=i.checked;
+			GlobalUserPreferences.save();
+		}));
+		items.add(new SmallTextItem(R.string.sk_settings_allow_remote_loading_explanation));
 
 		items.add(new HeaderItem(R.string.sk_timelines));
 		items.add(new SwitchItem(R.string.sk_settings_show_replies, R.drawable.ic_fluent_chat_multiple_24_regular, GlobalUserPreferences.showReplies, i->{

mastodon/src/main/java/org/joinmastodon/android/fragments/account_list/AccountRelatedAccountListFragment.java

@@ -3,16 +3,27 @@ package org.joinmastodon.android.fragments.account_list;
 import android.net.Uri;
 import android.os.Bundle;
 
+import org.joinmastodon.android.R;
+import org.joinmastodon.android.api.MastodonAPIRequest;
+import org.joinmastodon.android.api.requests.accounts.GetAccountByHandle;
+import org.joinmastodon.android.api.session.AccountSession;
+import org.joinmastodon.android.api.session.AccountSessionManager;
 import org.joinmastodon.android.model.Account;
 import org.parceler.Parcels;
 
-public abstract class AccountRelatedAccountListFragment extends PaginatedAccountListFragment{
+import java.util.Optional;
+
+public abstract class AccountRelatedAccountListFragment extends PaginatedAccountListFragment<Account> {
 	protected Account account;
+	protected String initialSubtitle = "";
 
 	@Override
 	public void onCreate(Bundle savedInstanceState){
 		super.onCreate(savedInstanceState);
 		account=Parcels.unwrap(getArguments().getParcelable("targetAccount"));
+		if (getArguments().containsKey("remoteAccount")) {
+			remoteInfo = Parcels.unwrap(getArguments().getParcelable("remoteAccount"));
+		}
 		setTitle("@"+account.acct);
 	}
 
@@ -22,4 +33,36 @@ public abstract class AccountRelatedAccountListFragment extends PaginatedAccount
 				? "/users/" + account.id
 				: '@' + account.acct).build();
 	}
+
+	@Override
+	public String getRemoteDomain() {
+		return account.getDomainFromURL();
+	}
+
+	@Override
+	public Account getCurrentInfo() {
+		return doneWithHomeInstance && remoteInfo != null ? remoteInfo : account;
+	}
+
+	@Override
+	protected MastodonAPIRequest<Account> loadRemoteInfo() {
+		return new GetAccountByHandle(account.acct);
+	}
+
+	@Override
+	protected AccountSession getRemoteSession() {
+		return Optional.ofNullable(remoteInfo)
+				.map(AccountSessionManager.getInstance()::tryGetAccount)
+				.orElse(null);
+	}
+
+	@Override
+	protected void onRemoteLoadingFailed() {
+		super.onRemoteLoadingFailed();
+		String prefix = initialSubtitle == null ? "" :
+				initialSubtitle + " " + getContext().getString(R.string.sk_separator) + " ";
+		String str = prefix +
+				getContext().getString(R.string.sk_no_remote_info_hint, getSession().domain);
+		setSubtitle(str);
+	}
 }

mastodon/src/main/java/org/joinmastodon/android/fragments/account_list/BaseAccountListFragment.java

@@ -1,5 +1,6 @@
 package org.joinmastodon.android.fragments.account_list;
 
+import android.annotation.SuppressLint;
 import android.app.ProgressDialog;
 import android.app.assist.AssistContent;
 import android.content.Intent;
@@ -47,6 +48,7 @@ import java.util.stream.Collectors;
 
 import androidx.annotation.CallSuper;
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import androidx.recyclerview.widget.RecyclerView;
 import me.grishka.appkit.Nav;
 import me.grishka.appkit.api.APIRequest;
@@ -243,10 +245,13 @@ public abstract class BaseAccountListFragment extends RecyclerFragment<BaseAccou
 			UiUtils.enablePopupMenuIcons(getActivity(), contextMenu);
 		}
 
+		@SuppressLint("SetTextI18n")
 		@Override
 		public void onBind(AccountItem item){
 			name.setText(item.parsedName);
-			username.setText("@"+item.account.acct);
+			username.setText("@"+ (item.account.isRemote
+					? item.account.getFullyQualifiedName()
+					: item.account.acct));
 			bindRelationship();
 		}
 
@@ -282,7 +287,8 @@ public abstract class BaseAccountListFragment extends RecyclerFragment<BaseAccou
 		public void onClick(){
 			Bundle args=new Bundle();
 			args.putString("account", accountID);
-			args.putParcelable("profileAccount", Parcels.wrap(item.account));
+			if (item.account.isRemote) args.putParcelable("remoteAccount", Parcels.wrap(item.account));
+			else args.putParcelable("profileAccount", Parcels.wrap(item.account));
 			Nav.go(getActivity(), ProfileFragment.class, args);
 		}
 
@@ -423,5 +429,10 @@ public abstract class BaseAccountListFragment extends RecyclerFragment<BaseAccou
 			emojiHelper=new CustomEmojiHelper();
 			emojiHelper.setText(parsedName=HtmlParser.parseCustomEmoji(account.displayName, account.emojis));
 		}
+
+		@Override
+		public boolean equals(@Nullable Object obj) {
+			return obj instanceof AccountItem i && i.account.url.equals(account.url);
+		}
 	}
 }

mastodon/src/main/java/org/joinmastodon/android/fragments/account_list/FollowerListFragment.java

@@ -13,12 +13,12 @@ public class FollowerListFragment extends AccountRelatedAccountListFragment{
 	@Override
 	public void onCreate(Bundle savedInstanceState){
 		super.onCreate(savedInstanceState);
-		setSubtitle(getResources().getQuantityString(R.plurals.x_followers, (int)(account.followersCount%1000), account.followersCount));
+		setSubtitle(initialSubtitle = getResources().getQuantityString(R.plurals.x_followers, (int)(account.followersCount%1000), account.followersCount));
 	}
 
 	@Override
 	public HeaderPaginationRequest<Account> onCreateRequest(String maxID, int count){
-		return new GetAccountFollowers(account.id, maxID, count);
+		return new GetAccountFollowers(getCurrentInfo().id, maxID, count);
 	}
 
 	@Override

mastodon/src/main/java/org/joinmastodon/android/fragments/account_list/FollowingListFragment.java

@@ -13,12 +13,12 @@ public class FollowingListFragment extends AccountRelatedAccountListFragment{
 	@Override
 	public void onCreate(Bundle savedInstanceState){
 		super.onCreate(savedInstanceState);
-		setSubtitle(getResources().getQuantityString(R.plurals.x_following, (int)(account.followingCount%1000), account.followingCount));
+		setSubtitle(initialSubtitle = getResources().getQuantityString(R.plurals.x_following, (int)(account.followingCount%1000), account.followingCount));
 	}
 
 	@Override
 	public HeaderPaginationRequest<Account> onCreateRequest(String maxID, int count){
-		return new GetAccountFollowing(account.id, maxID, count);
+		return new GetAccountFollowing(getCurrentInfo().id, maxID, count);
 	}
 
 	@Override

mastodon/src/main/java/org/joinmastodon/android/fragments/account_list/PaginatedAccountListFragment.java

@@ -1,33 +1,173 @@
 package org.joinmastodon.android.fragments.account_list;
 
+import android.os.Bundle;
+import android.view.View;
+
+import org.joinmastodon.android.GlobalUserPreferences;
+import org.joinmastodon.android.api.MastodonAPIRequest;
 import org.joinmastodon.android.api.requests.HeaderPaginationRequest;
+import org.joinmastodon.android.api.session.AccountSession;
 import org.joinmastodon.android.model.Account;
 import org.joinmastodon.android.model.HeaderPaginationList;
 
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
 import java.util.stream.Collectors;
 
+import me.grishka.appkit.api.Callback;
+import me.grishka.appkit.api.ErrorResponse;
 import me.grishka.appkit.api.SimpleCallback;
 
-public abstract class PaginatedAccountListFragment extends BaseAccountListFragment{
+public abstract class PaginatedAccountListFragment<T> extends BaseAccountListFragment{
 	private String nextMaxID;
+	private MastodonAPIRequest<T> remoteInfoRequest;
+	protected boolean doneWithHomeInstance, remoteRequestFailed, startedRemoteLoading, remoteDisabled;
+	protected int localOffset;
+	protected T remoteInfo;
 
 	public abstract HeaderPaginationRequest<Account> onCreateRequest(String maxID, int count);
 
+	protected abstract MastodonAPIRequest<T> loadRemoteInfo();
+	public abstract T getCurrentInfo();
+	public abstract String getRemoteDomain();
+
+	@Override
+	public void onViewCreated(View view, Bundle savedInstanceState) {
+		super.onViewCreated(view, savedInstanceState);
+
+		// already have remote info (e.g. from arguments), so no need to fetch it again
+		if (remoteInfo != null) {
+			onRemoteInfoLoaded(remoteInfo);
+			return;
+		}
+
+		remoteDisabled = !GlobalUserPreferences.allowRemoteLoading
+				|| getSession().domain.equals(getRemoteDomain());
+		if (!remoteDisabled) {
+			remoteInfoRequest = loadRemoteInfo().setCallback(new Callback<>() {
+				@Override
+				public void onSuccess(T result) {
+					if (getContext() == null) return;
+					onRemoteInfoLoaded(result);
+				}
+
+				@Override
+				public void onError(ErrorResponse error) {
+					if (getContext() == null) return;
+					onRemoteLoadingFailed();
+				}
+			});
+			remoteInfoRequest.execRemote(getRemoteDomain(), getRemoteSession());
+		}
+	}
+
+	/**
+	 * override to provide an ideal account session (e.g. if you're logged into the author's remote
+	 * account) to make the remote request from. if null is provided, will try to get any session
+	 * on the remote domain, or tries the request without authentication.
+	 */
+	protected AccountSession getRemoteSession() {
+		return null;
+	}
+
+	protected void onRemoteInfoLoaded(T info) {
+		this.remoteInfo = info;
+		this.remoteInfoRequest = null;
+		maybeStartLoadingRemote();
+	}
+
+	protected void onRemoteLoadingFailed() {
+		this.remoteRequestFailed = true;
+		this.remoteInfo = null;
+		this.remoteInfoRequest = null;
+		if (doneWithHomeInstance) dataLoaded();
+	}
+
+	@Override
+	public void dataLoaded() {
+		super.dataLoaded();
+		footerProgress.setVisibility(View.GONE);
+	}
+
+	private void maybeStartLoadingRemote() {
+		if (startedRemoteLoading || remoteDisabled) return;
+		if (!remoteRequestFailed) {
+			if (data.size() == 0) showProgress();
+			else footerProgress.setVisibility(View.VISIBLE);
+		}
+		if (doneWithHomeInstance && remoteInfo != null) {
+			startedRemoteLoading = true;
+			loadData(localOffset, itemsPerPage * 2);
+		}
+	}
+
+	@Override
+	public void onRefresh() {
+		localOffset = 0;
+		doneWithHomeInstance = false;
+		startedRemoteLoading = false;
+		super.onRefresh();
+	}
+
+	@Override
+	public void loadData(int offset, int count) {
+		// always subtract the amount loaded through the home instance once loading from remote
+		// since loadData gets called with data.size() (data includes both local and remote)
+		if (doneWithHomeInstance) offset -= localOffset;
+		super.loadData(offset, count);
+	}
+
 	@Override
 	protected void doLoadData(int offset, int count){
-		currentRequest=onCreateRequest(offset==0 ? null : nextMaxID, count)
+		MastodonAPIRequest<?> request = onCreateRequest(offset==0 ? null : nextMaxID, count)
 				.setCallback(new SimpleCallback<>(this){
 					@Override
 					public void onSuccess(HeaderPaginationList<Account> result){
+						boolean justRefreshed = !doneWithHomeInstance && offset == 0;
+						Collection<AccountItem> d = justRefreshed ? List.of() : data;
+
 						if(result.nextPageUri!=null)
 							nextMaxID=result.nextPageUri.getQueryParameter("max_id");
 						else
 							nextMaxID=null;
 						if (getActivity() == null) return;
-						onDataLoaded(result.stream().map(AccountItem::new).collect(Collectors.toList()), nextMaxID!=null);
+						List<AccountItem> items = result.stream()
+								.filter(a -> d.size() > 1000 || d.stream()
+										.noneMatch(i -> i.account.url.equals(a.url)))
+								.map(AccountItem::new)
+								.collect(Collectors.toList());
+
+						boolean hasMore = nextMaxID != null;
+
+						if (!hasMore && !doneWithHomeInstance) {
+							// only runs last time data was fetched from the home instance
+							localOffset = d.size() + items.size();
+							doneWithHomeInstance = true;
+						}
+
+						onDataLoaded(items, hasMore);
+						if (doneWithHomeInstance) maybeStartLoadingRemote();
 					}
-				})
+
-				.exec(accountID);
+					@Override
+					public void onError(ErrorResponse error) {
+						if (doneWithHomeInstance) {
+							onRemoteLoadingFailed();
+							onDataLoaded(Collections.emptyList(), false);
+							return;
+						}
+						super.onError(error);
+					}
+				});
+
+		if (doneWithHomeInstance && remoteInfo == null) return; // we are waiting
+		if (doneWithHomeInstance && remoteInfo != null) {
+			request.execRemote(getRemoteDomain(), getRemoteSession());
+		} else {
+			request.exec(accountID);
+		}
+		currentRequest = request;
 	}
 
 	@Override

mastodon/src/main/java/org/joinmastodon/android/fragments/account_list/StatusFavoritesListFragment.java

@@ -7,17 +7,23 @@ import org.joinmastodon.android.R;
 import org.joinmastodon.android.api.requests.HeaderPaginationRequest;
 import org.joinmastodon.android.api.requests.statuses.GetStatusFavorites;
 import org.joinmastodon.android.model.Account;
+import org.joinmastodon.android.model.Status;
 
 public class StatusFavoritesListFragment extends StatusRelatedAccountListFragment{
 	@Override
 	public void onCreate(Bundle savedInstanceState){
 		super.onCreate(savedInstanceState);
+		updateTitle(status);
+	}
+
+	@Override
+	protected void updateTitle(Status status) {
 		setTitle(getResources().getQuantityString(R.plurals.x_favorites, (int)(status.favouritesCount%1000), status.favouritesCount));
 	}
 
 	@Override
 	public HeaderPaginationRequest<Account> onCreateRequest(String maxID, int count){
-		return new GetStatusFavorites(status.id, maxID, count);
+		return new GetStatusFavorites(getCurrentInfo().id, maxID, count);
 	}
 
 	@Override

mastodon/src/main/java/org/joinmastodon/android/fragments/account_list/StatusReblogsListFragment.java

@@ -7,17 +7,23 @@ import org.joinmastodon.android.R;
 import org.joinmastodon.android.api.requests.HeaderPaginationRequest;
 import org.joinmastodon.android.api.requests.statuses.GetStatusReblogs;
 import org.joinmastodon.android.model.Account;
+import org.joinmastodon.android.model.Status;
 
 public class StatusReblogsListFragment extends StatusRelatedAccountListFragment{
 	@Override
 	public void onCreate(Bundle savedInstanceState){
 		super.onCreate(savedInstanceState);
+		updateTitle(status);
+	}
+
+	@Override
+	protected void updateTitle(Status status) {
 		setTitle(getResources().getQuantityString(R.plurals.x_reblogs, (int)(status.reblogsCount%1000), status.reblogsCount));
 	}
 
 	@Override
 	public HeaderPaginationRequest<Account> onCreateRequest(String maxID, int count){
-		return new GetStatusReblogs(status.id, maxID, count);
+		return new GetStatusReblogs(getCurrentInfo().id, maxID, count);
 	}
 
 	@Override

mastodon/src/main/java/org/joinmastodon/android/fragments/account_list/StatusRelatedAccountListFragment.java

@@ -3,12 +3,27 @@ package org.joinmastodon.android.fragments.account_list;
 import android.net.Uri;
 import android.os.Bundle;
 
+import org.joinmastodon.android.R;
+import org.joinmastodon.android.api.MastodonAPIRequest;
+import org.joinmastodon.android.api.requests.statuses.GetStatusByID;
+import org.joinmastodon.android.api.session.AccountSession;
+import org.joinmastodon.android.api.session.AccountSessionManager;
 import org.joinmastodon.android.model.Status;
 import org.parceler.Parcels;
 
-public abstract class StatusRelatedAccountListFragment extends PaginatedAccountListFragment{
+import java.util.Optional;
+
+public abstract class StatusRelatedAccountListFragment extends PaginatedAccountListFragment<Status> {
 	protected Status status;
 
+	protected abstract void updateTitle(Status status);
+
+	protected MastodonAPIRequest<Status> loadRemoteInfo() {
+		String[] parts = status.url.split("/");
+		if (parts.length == 0) return null;
+		return new GetStatusByID(parts[parts.length - 1]);
+	}
+
 	@Override
 	public void onCreate(Bundle savedInstanceState){
 		super.onCreate(savedInstanceState);
@@ -17,7 +32,7 @@ public abstract class StatusRelatedAccountListFragment extends PaginatedAccountL
 
 	@Override
 	protected boolean hasSubtitle(){
-		return false;
+		return remoteRequestFailed;
 	}
 
 	@Override
@@ -28,4 +43,35 @@ public abstract class StatusRelatedAccountListFragment extends PaginatedAccountL
 						: '@' + status.account.acct + '/' + status.id)
 				.build();
 	}
+
+	@Override
+	public String getRemoteDomain() {
+		return Uri.parse(status.url).getHost();
+	}
+
+	@Override
+	public Status getCurrentInfo() {
+		return doneWithHomeInstance && remoteInfo != null ? remoteInfo : status;
+	}
+
+	@Override
+	protected AccountSession getRemoteSession() {
+		return Optional.ofNullable(remoteInfo)
+				.map(s -> s.account)
+				.map(AccountSessionManager.getInstance()::tryGetAccount)
+				.orElse(null);
+	}
+
+	@Override
+	protected void onRemoteInfoLoaded(Status info) {
+		super.onRemoteInfoLoaded(info);
+		updateTitle(remoteInfo);
+	}
+
+	@Override
+	protected void onRemoteLoadingFailed() {
+		super.onRemoteLoadingFailed();
+		setSubtitle(getContext().getString(R.string.sk_no_remote_info_hint, getSession().domain));
+		updateToolbar();
+	}
 }

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

@@ -1,7 +1,10 @@
 package org.joinmastodon.android.model;
 
+import android.net.Uri;
 import android.text.TextUtils;
 
+import androidx.annotation.Nullable;
+
 import org.joinmastodon.android.api.ObjectValidationException;
 import org.joinmastodon.android.api.RequiredField;
 import org.parceler.Parcel;
@@ -135,6 +138,8 @@ public class Account extends BaseModel implements Searchable{
 
 	public List<Role> roles;
 
+	public @Nullable String fqn; // akkoma has this, mastodon't
+
 	@Override
 	public String getQuery() {
 		return url;
@@ -162,6 +167,7 @@ public class Account extends BaseModel implements Searchable{
 			moved.postprocess();
 		if(TextUtils.isEmpty(displayName))
 			displayName=username;
+		if(fqn == null) fqn = getFullyQualifiedName();
 	}
 
 	public boolean isLocal(){
@@ -173,6 +179,10 @@ public class Account extends BaseModel implements Searchable{
 		return parts.length==1 ? null : parts[1];
 	}
 
+	public String getDomainFromURL() {
+		return Uri.parse(url).getHost();
+	}
+
 	public String getDisplayUsername(){
 		return '@'+acct;
 	}
@@ -181,6 +191,10 @@ public class Account extends BaseModel implements Searchable{
 		return '@'+acct.split("@")[0];
 	}
 
+	public String getFullyQualifiedName() {
+		return fqn != null ? fqn : acct.split("@")[0] + "@" + getDomainFromURL();
+	}
+
 	@Override
 	public String toString(){
 		return "Account{"+

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

@@ -11,6 +11,14 @@ import androidx.annotation.CallSuper;
 import androidx.annotation.NonNull;
 
 public abstract class BaseModel implements Cloneable{
+
+	/**
+	 * indicates the profile has been fetched from a foreign instance.
+	 *
+	 * @see MastodonAPIRequest#execRemote
+	 */
+	public transient boolean isRemote;
+
 	@CallSuper
 	public void postprocess() throws ObjectValidationException{
 		try{

mastodon/src/main/java/org/joinmastodon/android/ui/utils/UiUtils.java

@@ -56,6 +56,7 @@ import org.joinmastodon.android.E;
 import org.joinmastodon.android.GlobalUserPreferences;
 import org.joinmastodon.android.MastodonApp;
 import org.joinmastodon.android.R;
+import org.joinmastodon.android.api.MastodonErrorResponse;
 import org.joinmastodon.android.api.StatusInteractionController;
 import org.joinmastodon.android.api.requests.accounts.SetAccountBlocked;
 import org.joinmastodon.android.api.requests.accounts.SetAccountFollowed;
@@ -1136,6 +1137,12 @@ public class UiUtils {
 		}
 	}
 
+	public static void lookupAccountHandle(Context context, String accountID, String query, BiConsumer<Class<? extends Fragment>, Bundle> go) {
+		parseFediverseHandle(query).ifPresentOrElse(
+				handle -> lookupAccountHandle(context, accountID, handle, go),
+				() -> go.accept(null, null)
+		);
+	}
 	public static void lookupAccountHandle(Context context, String accountID, Pair<String, Optional<String>> queryHandle, BiConsumer<Class<? extends Fragment>, Bundle> go) {
 		String fullHandle = ("@" + queryHandle.first) + (queryHandle.second.map(domain -> "@" + domain).orElse(""));
 		new GetSearchResults(fullHandle, GetSearchResults.Type.ACCOUNTS, true)
@@ -1153,12 +1160,18 @@ public class UiUtils {
 							return;
 						}
 						Toast.makeText(context, R.string.sk_resource_not_found, Toast.LENGTH_SHORT).show();
+						args.putString("error", context.getString(R.string.sk_resource_not_found));
 						go.accept(null, null);
 					}
 
 					@Override
 					public void onError(ErrorResponse error) {
-
+						Bundle args = new Bundle();
+						if (error instanceof MastodonErrorResponse e) {
+							args.putString("error", e.error);
+							args.putInt("httpStatus", e.httpStatus);
+						}
+						go.accept(null, args);
 					}
 				}).exec(accountID);
 	}

mastodon/src/main/res/drawable/ic_fluent_communication_24_regular.xml

@@ -0,0 +1,3 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="24dp" android:height="24dp" android:viewportWidth="24" android:viewportHeight="24">
+    <path android:pathData="M12 4.5c-4.694 0-8.5 3.806-8.5 8.5 0 2.345 0.948 4.466 2.484 6.005 0.293 0.293 0.293 0.768 0 1.06-0.294 0.293-0.769 0.293-1.061 0C3.118 18.256 2 15.758 2 13 2 7.477 6.477 3 12 3s10 4.477 10 10c0 2.758-1.118 5.256-2.923 7.065-0.292 0.293-0.767 0.293-1.06 0-0.293-0.292-0.294-0.767-0.001-1.06C19.552 17.467 20.5 15.345 20.5 13c0-4.694-3.806-8.5-8.5-8.5zM12 8c-2.761 0-5 2.239-5 5 0 1.382 0.56 2.632 1.466 3.537 0.293 0.293 0.293 0.768 0 1.06-0.292 0.294-0.767 0.294-1.06 0.001C6.229 16.423 5.5 14.796 5.5 13c0-3.59 2.91-6.5 6.5-6.5s6.5 2.91 6.5 6.5c0 1.796-0.73 3.423-1.906 4.598-0.293 0.293-0.768 0.293-1.06 0-0.293-0.293-0.293-0.768 0-1.06C16.44 15.631 17 14.381 17 13c0-2.761-2.239-5-5-5zm0 2.5c-1.38 0-2.5 1.12-2.5 2.5s1.12 2.5 2.5 2.5 2.5-1.12 2.5-2.5-1.12-2.5-2.5-2.5zM11 13c0-0.552 0.448-1 1-1s1 0.448 1 1-0.448 1-1 1-1-0.448-1-1z" android:fillColor="@color/fluent_default_icon_tint"/>
+</vector>

mastodon/src/main/res/values/strings_sk.xml

@@ -293,4 +293,8 @@
     <string name="sk_open_in_app_failed">Could not open in app</string>
     <string name="sk_external_share_title">Share with account</string>
     <string name="sk_external_share_or_open_title">Share or open with account</string>
+    <string name="sk_no_remote_info_hint">remote info unavailable</string>
+    <string name="sk_error_loading_profile">Failed loading the profile on your home instance.</string>
+    <string name="sk_settings_allow_remote_loading">Load info from remote instances</string>
+    <string name="sk_settings_allow_remote_loading_explanation">Try fetching more accurate listings for followers, likes and boosts by loading the information from the instance of origin.</string>
 </resources>