Expandable-Recycler

A library provide expand & collapse state for recyclerview.

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Including In Your Project

If you are a Maven user you can easily include the library by specifying it as a dependency:

Maven

<dependency>
  <groupId>com.infideap.expandablerecycler</groupId>
  <artifactId>expandable-recycler</artifactId>
  <version>0.0.1</version>
  <type>pom</type>
</dependency>

Gradle

dependencies {
   implementation 'com.infideap.expandablerecycler:expandable-recycler:0.0.1'
}

if the gradle unable to sync, you may include this line in project level gradle,

repositories {
 maven{
   url "https://dl.bintray.com/infideap2/expandable-recycler"
 }
}

or, you can include it by download this project and import /expandable-recycler as module.

How to use

You can use RecyclerView library provide by Google, not necessary to use ExpandableRecycler in this library (Just gimmick).

Then, in java class, use ExpandableRecycler.Adapter as RecyclerView's adapter. Like below :

public class PostExpandableRecyclerViewAdapter extends ExpandableRecycler.Adapter<PostExpandableRecyclerViewAdapter.ViewHolder> {
   
   ...
   
   @Override
    public void onBindViewHolder(final ViewHolder holder, final int position) {
        holder.mItem = mValues.get(position);
        //call this method after assign holder's item
        super.onBindViewHolder(holder, position);


    }
    
    /**
     * 
     * @param position
     * @return number of child for specific position/index
     */
    @Override
    public int getChildCount(int position) {
        return mValues.get(position).comments.size();
    }
    
    ...
    
    
    public class ViewHolder extends ExpandableRecycler.ViewHolder {
        View view;
        TextView titleView;
        TextView postView;
        View childView;
        View parentView;

        public Post mItem;

        public ViewHolder(Context context, ViewGroup parent) {
            super(context, parent);
            view = itemView;

        }

        @Override
        public View getView(Context context, ViewGroup parent) {

            parentView = LayoutInflater.from(context).inflate(R.layout.fragement_post_parent, parent, false);

            titleView = (TextView) parentView.findViewById(R.id.textView_title);
            postView = (TextView) parentView.findViewById(R.id.textView_post);

            titleView.setText(mItem.title);
            postView.setText(mItem.body);

            return parentView;
        }

        @Override
        public View getChildView(Context context, ViewGroup parent, int childPosition) {
            childView = LayoutInflater.from(context).inflate(R.layout.fragment_post_child, parent, false);
            TextView emailTextView = (TextView) childView.findViewById(R.id.textView_email);
            TextView commentTextView = (TextView) childView.findViewById(R.id.textView_comment);
            emailTextView.setText(mItem.comments.get(childPosition).email);
            commentTextView.setText(mItem.comments.get(childPosition).body);

            childView.findViewById(R.id.bookmark).setBackgroundColor(colors[childPosition % colors.length]);
            return childView;
        }


        @Override
        public String toString() {
            return super.toString() + " '" + postView.getText() + "'";
        }
    }
}