androidx.recyclerview.widget.RecyclerView#findViewHolderForLayoutPosition ( )源码实例Demo

public boolean buildSequence(@NonNull RecyclerView list) {
    LinearLayoutManager llm = (LinearLayoutManager) list.getLayoutManager();
    if (llm == null) return false;

    int pos = llm.findFirstCompletelyVisibleItemPosition();
    if (pos == -1) pos = 0;

    DownloadCardsAdapter.ViewHolder holder = (DownloadCardsAdapter.ViewHolder) list.findViewHolderForLayoutPosition(pos);
    if (holder != null) {
        list.scrollToPosition(pos);

        add(forView(holder.donutProgress, R.string.tutorial_moreDetails)
                .fitSystemWindows(true)
                .focusShape(FocusShape.CIRCLE)
                .enableAutoTextPosition());
        add(forView(holder.more, R.string.tutorial_evenMoreDetails)
                .fitSystemWindows(true)
                .focusShape(FocusShape.ROUNDED_RECTANGLE)
                .roundRectRadius(8)
                .enableAutoTextPosition());
        return true;
    }

    return false;
}
 

public final boolean buildForServers(@NonNull RecyclerView list) {
    RecyclerView.ViewHolder holder = list.findViewHolderForLayoutPosition(0);
    if (holder != null) {
        list.scrollToPosition(0);

        add(forView(holder.itemView, R.string.tutorial_serverDetails)
                .enableAutoTextPosition()
                .roundRectRadius(8)
                .focusShape(FocusShape.ROUNDED_RECTANGLE));
        return true;
    }

    return false;
}
 

public final boolean buildForPeers(@NonNull RecyclerView list) {
    RecyclerView.ViewHolder holder = list.findViewHolderForLayoutPosition(0);
    if (holder != null) {
        list.scrollToPosition(0);

        add(forView(holder.itemView, R.string.tutorial_peerDetails)
                .enableAutoTextPosition()
                .roundRectRadius(8)
                .focusShape(FocusShape.ROUNDED_RECTANGLE));
        return true;
    }

    return false;
}
 

public final boolean buildSequence(@NonNull RecyclerView list, @Nullable AriaDirectory dir) {
    int firstFile = dir == null ? 0 : dir.dirs.size();
    RecyclerView.ViewHolder holder = list.findViewHolderForLayoutPosition(firstFile);
    if (holder != null) {
        list.scrollToPosition(firstFile);

        add(forView(holder.itemView, R.string.tutorial_fileDetails)
                .enableAutoTextPosition()
                .roundRectRadius(8)
                .focusShape(FocusShape.ROUNDED_RECTANGLE));
        return true;
    }

    return false;
}
 

public final boolean buildSequence(@NonNull RecyclerView list) {
    RecyclerView.ViewHolder holder = list.findViewHolderForLayoutPosition(0);
    if (holder != null) {
        list.scrollToPosition(0);

        add(forView(holder.itemView, R.string.tutorial_folderDetails)
                .enableAutoTextPosition()
                .roundRectRadius(8)
                .focusShape(FocusShape.ROUNDED_RECTANGLE));
        return true;
    }

    return false;
}
 

public final boolean buildSequence(@NonNull View createGame, @NonNull RecyclerView list) {
    LinearLayoutManager llm = (LinearLayoutManager) list.getLayoutManager();
    if (llm == null) return false;

    int pos = llm.findFirstVisibleItemPosition();
    if (pos == -1) return false;

    GamesAdapter.ViewHolder holder = (GamesAdapter.ViewHolder) list.findViewHolderForLayoutPosition(pos);
    if (holder != null) {
        add(forView(holder.status, R.string.tutorial_gameStatus)
                .focusShape(FocusShape.CIRCLE)
                .enableAutoTextPosition()
                .fitSystemWindows(true));
        add(forView(holder.locked, R.string.tutorial_gameLocked)
                .focusShape(FocusShape.CIRCLE)
                .enableAutoTextPosition()
                .fitSystemWindows(true));
        add(forView(holder.spectate, R.string.tutorial_spectateGame)
                .focusShape(FocusShape.ROUNDED_RECTANGLE)
                .roundRectRadius(8)
                .enableAutoTextPosition()
                .fitSystemWindows(true));
        add(forView(holder.join, R.string.tutorial_joinGame)
                .focusShape(FocusShape.ROUNDED_RECTANGLE)
                .roundRectRadius(8)
                .enableAutoTextPosition()
                .fitSystemWindows(true));
        add(forView(createGame, R.string.tutorial_createGame)
                .focusShape(FocusShape.CIRCLE)
                .enableAutoTextPosition()
                .fitSystemWindows(true));
        return true;
    }

    return false;
}
 

@Nullable
public View getViewByPosition(RecyclerView recyclerView, int position, @IdRes int viewId) {
    if (recyclerView == null) {
        return null;
    }
    BaseViewHolder viewHolder = (BaseViewHolder) recyclerView.findViewHolderForLayoutPosition(position);
    if (viewHolder == null) {
        return null;
    }
    return viewHolder.getView(viewId);
}
 

@Override
boolean isShownInList(RecyclerView list, int pos) {
    return list.findViewHolderForLayoutPosition(pos) != null;
}