FlexibleAdapter

DatabaseService.txt

public void createExpandableSectionsDatabaseTest(int size) {
        databaseType = DatabaseType.EXPANDABLE_SECTIONS;
        mItems.clear();
        for (int i = 0; i < size; i++) {
            mItems.add(newExpandableSectionItemTest(i + 1));//With expansion level 0
        }
    }


public static ExpandableHeaderItemTest newExpandableSectionItemTest(int i) {
        ExpandableHeaderItemTest expandableItem = new ExpandableHeaderItemTest("EH" + i);
        expandableItem.setTitle("Expandable Header " + i);
        for (int j = 1; j <= SUB_ITEMS; j++) {
            SubItemTest subItem = new SubItemTest(expandableItem.getId() + "-SB" + j, expandableItem);
            subItem.setTitle("Sub Item " + j);
            // NOTE: In case you want to retrieve the parent, you can implement ISectionable
            // then, assign the Header: ExpandableHeaderItem instance.
            //subItem.setHeader(expandableItem);
        }
        return expandableItem;
    }

ExpandableHeaderItemTest.java

package eu.davidea.samples.flexibleadapter.items;

import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

import eu.davidea.flexibleadapter.FlexibleAdapter;
import eu.davidea.flexibleadapter.Payload;
import eu.davidea.flexibleadapter.items.AbstractExpandableHeaderItem;
import eu.davidea.flexibleadapter.items.IExpandable;
import eu.davidea.flexibleadapter.items.IFlexible;
import eu.davidea.flexibleadapter.items.IHeader;
import eu.davidea.samples.flexibleadapter.R;
import eu.davidea.samples.flexibleadapter.items.ExpandableHeaderItem.ExpandableHeaderViewHolder;
import eu.davidea.viewholders.ExpandableViewHolder;

/**
 * This is an experiment to evaluate how a Section with header can also be expanded/collapsed.
 * <p>Here, it still benefits of the common fields declared in AbstractItem.</p>
 * It's important to note that, the ViewHolder must be specified in all &lt;diamond&gt; signature.
 */
public class ExpandableHeaderItemTest
        extends AbstractExpandableHeaderItem<ExpandableHeaderItemTest.ExpandableHeaderViewHolder, SubItemTest> {

    public String getId() {
        return id;
    }

    private final String id;
    /* Flags for FlexibleAdapter */
    private boolean mExpanded = false;

    public void setTitle(String title) {
        this.title = title;
    }

    private String title;


    public ExpandableHeaderItemTest(String id) {
        setDraggable(true);
        //We start with header shown and expanded
        setHidden(false);
        setExpanded(true);
        //NOT selectable (otherwise ActionMode will be activated on long click)!
        setSelectable(false);
        this.id = id;
    }

    @Override
    public boolean isExpanded() {
        return mExpanded;
    }

    @Override
    public void setExpanded(boolean expanded) {
        mExpanded = expanded;
    }

    @Override
    public int getExpansionLevel() {
        return 0;
    }




    @Override
    public boolean equals(Object inObject) {
        if (inObject instanceof ExpandableHeaderItemTest) {
            ExpandableHeaderItemTest inItem = (ExpandableHeaderItemTest) inObject;
            return this.id.equals(inItem.id);
        }
        return false;
    }

    @Override
    public int getSpanSize(int spanCount, int position) {
        return spanCount;
    }

    @Override
    public int getLayoutRes() {
        return R.layout.recycler_expandable_header_item;
    }

    @Override
    public ExpandableHeaderViewHolder createViewHolder(View view, FlexibleAdapter<IFlexible> adapter) {
        return new ExpandableHeaderViewHolder(view, adapter);
    }

    @Override
    public void bindViewHolder(FlexibleAdapter<IFlexible> adapter, ExpandableHeaderViewHolder holder, int position, List<Object> payloads) {
        if (payloads.size() > 0) {
            Log.d(this.getClass().getSimpleName(), "ExpandableHeaderItem Payload " + payloads + " - " + getTitle());
        } else {
            Log.d(this.getClass().getSimpleName(), "ExpandableHeaderItem NoPayload - " + getTitle());
            holder.mTitle.setText(getTitle());
        }
        String subtitle = (String.format("%s subItems %s(%s)",
                countFilteredChildren(adapter),
                (adapter.hasFilter() ? "found " : ""),
                (isExpanded() ? "expanded" : "collapsed")));
        holder.mSubtitle.setText(subtitle);
    }

    private String getTitle() {
        return title;
    }


    private int countFilteredChildren(FlexibleAdapter<IFlexible> adapter) {
        if (adapter.hasFilter()) {
            String filter = adapter.getFilter(String.class);
            int size = 0;
            for (SubItemTest s : mSubItems) {
                if (s.filter(filter)) size++;
            }
            return size;
        }
        return adapter.getCurrentChildren(this).size();
    }

    /**
     * Provide a reference to the views for each data item.
     * Complex data labels may need more than one view per item, and
     * you provide access to all the views for a data item in a view holder.
     */
    static class ExpandableHeaderViewHolder extends ExpandableViewHolder {

        TextView mTitle;
        TextView mSubtitle;
        ImageView mHandleView;

        ExpandableHeaderViewHolder(View view, FlexibleAdapter adapter) {
            super(view, adapter, true);//True for sticky
            mTitle = view.findViewById(R.id.title);
            mSubtitle = view.findViewById(R.id.subtitle);
            this.mHandleView = view.findViewById(R.id.row_handle);
            if (adapter.isHandleDragEnabled()) {
                this.mHandleView.setVisibility(View.VISIBLE);
                setDragHandleView(mHandleView);
            } else {
                this.mHandleView.setVisibility(View.GONE);
            }

        }


    }

    @Override
    public String toString() {
        return "ExpandableHeaderItem[" + super.toString() + "//SubItems" + mSubItems + "]";
    }

}

SubItemTest.java

package eu.davidea.samples.flexibleadapter.items;

import android.animation.Animator;
import android.content.Context;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.annotation.NonNull;

import java.util.List;

import eu.davidea.flexibleadapter.FlexibleAdapter;
import eu.davidea.flexibleadapter.helpers.AnimatorHelper;
import eu.davidea.flexibleadapter.items.AbstractSectionableItem;
import eu.davidea.flexibleadapter.items.IFilterable;
import eu.davidea.flexibleadapter.items.IFlexible;
import eu.davidea.flexibleadapter.items.IHeader;
import eu.davidea.flexibleadapter.utils.FlexibleUtils;
import eu.davidea.samples.flexibleadapter.R;
import eu.davidea.viewholders.FlexibleViewHolder;

/**
 * If you don't have many fields in common better to extend directly from
 * {@link eu.davidea.flexibleadapter.items.AbstractFlexibleItem} to benefit of the already
 * implemented methods (getter and setters).
 */
public class SubItemTest extends AbstractSectionableItem<SubItemTest.ChildViewHolder, ExpandableHeaderItemTest> implements IFilterable<String> {

    private final String id;
    /**
     * The header of this item
     */
    ExpandableHeaderItemTest header;

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    String title;

    public SubItemTest(String id, ExpandableHeaderItemTest header) {
        super(header);
        setDraggable(true);
        this.id=id;
    }


    @Override
    public boolean equals(Object inObject) {
        if (inObject instanceof SubItemTest) {
            SubItemTest inItem = (SubItemTest) inObject;
            return this.id.equals(inItem.id);
        }
        return false;
    }

    @Override
    public int getLayoutRes() {
        return R.layout.recycler_sub_item;
    }

    @Override
    public ChildViewHolder createViewHolder(View view, FlexibleAdapter adapter) {
        return new ChildViewHolder(view, adapter);
    }

    @Override
    public void bindViewHolder(FlexibleAdapter<IFlexible> adapter, ChildViewHolder holder, int position, List<Object> payloads) {
        //In case of searchText matches with Title or with an SimpleItem's field
        // this will be highlighted
        if (adapter.hasFilter()) {
            Context context = holder.itemView.getContext();
            String filter = adapter.getFilter(String.class);
            FlexibleUtils.highlightText(holder.mTitle, getTitle(), filter,
                    context.getResources().getColor(R.color.colorAccent_light));
        } else {
            holder.mTitle.setText(getTitle());
        }
    }

    @Override
    public boolean filter(String constraint) {
        return getTitle() != null && getTitle().toLowerCase().trim().contains(constraint);
    }

    /**
     * Provide a reference to the views for each data item.
     * Complex data labels may need more than one view per item, and
     * you provide access to all the views for a data item in a view holder.
     */
    static final class ChildViewHolder extends FlexibleViewHolder {

        public ImageView mHandleView;
        public TextView mTitle;

        public ChildViewHolder(View view, FlexibleAdapter adapter) {
            super(view, adapter);
            this.mTitle = view.findViewById(R.id.title);
            this.mHandleView = view.findViewById(R.id.row_handle);
            if (adapter.isHandleDragEnabled()) {
                this.mHandleView.setVisibility(View.VISIBLE);
                setDragHandleView(mHandleView);
            } else {
                this.mHandleView.setVisibility(View.GONE);
            }
        }

        @Override
        public float getActivationElevation() {
            return eu.davidea.utils.Utils.dpToPx(itemView.getContext(), 4f);
        }

        @Override
        public void scrollAnimators(@NonNull List<Animator> animators, int position, boolean isForward) {
            AnimatorHelper.scaleAnimator(animators, itemView, 0f);
        }
    }

    @Override
    public String toString() {
        return "SubItem[" + super.toString() + "]";
    }

}