Choice Mode in a RecyclerView?

Question

I'm trying to figure out how to achieve the same effect of

mListView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);

in a RecyclerView implementation. Please help.

Answer 1

There is no built-in support for a "choice mode" structure with RecyclerView. Your options are to either roll it yourself or use a third-party library that offers it. The DynamicRecyclerView library offers choice modes, but I have not tried it.

This sample app demonstrates implementing it yourself, in this case using the activated state to indicate which is the current choice. The overall pattern is:

• Have your RecyclerView.ViewHolder detect a UI operation that indicates a choice (click on a row? click on a RadioButton in the row? etc.).

• Keep track of the selection at the level of your RecyclerView.Adapter. In my case, a ChoiceCapableAdapter handles that, in conjunction with a SingleChoiceMode class that implements a ChoiceMode strategy.

• When a choice is made, update the newly-chosen row to reflect the choice and update the previously-chosen row to reflect that it is no longer chosen. findViewHolderForPosition() on RecyclerView can help here -- if you track the position of the last choice, findViewHolderForPosition() can give you the ViewHolder for that choice, so you can "un-choose" it.

• Keep track of the choice across configuration changes, by putting it in the saved instance state of the activity or fragment that is managing the RecyclerView.

Answer 2

I've created a library for this kind of choice mode applied to the RecyclerView, maybe it can help:

Description

This library has been created to help the integration of a multi-choice selection to the RecyclerView

Implementation

The integration with Gradle is very easy, you just need the jcenter repository and the library:

repositories {
    jcenter()
}
...

dependencies {
    compile 'com.davidecirillo.multichoicerecyclerview:multichoicerecyclerview:1.0.1'
}

Main steps for usage

Add the MultiChoiceRecyclerView to your xml file

<com.davidecirillo.multichoicesample.MultiChoiceRecyclerView
    android:id="@+id/multiChoiceRecyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

Instanciate you object and connect the view

MultiChoiceRecyclerView mMultiChoiceRecyclerView = (MultiChoiceRecyclerView) findViewById(R.id.multiChoiceRecyclerView);

Extend you adapter to the MultiChoiceAdapter and add it to the RecyclerView as per normal usage

public class MyAdapter extends MultiChoiceAdapter<MyViewHolder> {

    public MyAdapter(ArrayList<String> stringList, Context context) {
        this.mList = stringList;
        this.mContext = context;
    }

    ...
} 

MyAdapter myAdapter = new MyAdapter(mList, getApplicationContext());
mMultiChoiceRecyclerView.setAdapter(myAdapter);

For more information and customisations: https://github.com/dvdciri/MultiChoiceRecyclerView

Answer 3

You can follow this:

– Data (String name, boolean selected)

– Adapter with itemClickListener

– Activity or fragment

– activity_main (recyclerView)

– list_item (TextView, CheckBox)

Data

public class MultipleData {

    private String mTitle;
    private boolean mBoolean;

    public MultipleData(String title, boolean mBoolean) {
        this.mTitle = title;
        this.mBoolean = mBoolean;
    }

    public String getTitle() {
        return mTitle;
    }

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

    public boolean isBoolean() {
        return mBoolean;
    }

    public void setBoolean(boolean mBoolean) {
        this.mBoolean = mBoolean;
    }
}

Your views activity_main.xml (recyclerView)

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.thedeveloperworldisyours.fullrecycleview.multiple.MultipleFragment">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/multiple_fragment_recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</FrameLayout>

and list_item.xml (TextView, CheckBox)

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/multiple_list_item_text"
        android:layout_width="match_parent"
        android:layout_height="90dp"
        android:text="@string/app_name"
        android:typeface="monospace"
        android:layout_toLeftOf="@+id/multiple_list_item_check_button"
        android:gravity="center"
        android:textSize="@dimen/multiple_list_item_size_rock_stars"/>

    <RadioButton
        android:id="@+id/multiple_list_item_check_button"
        android:layout_width="wrap_content"
        android:layout_height="90dp"
        android:layout_alignParentRight="true"
        android:checked="false"
        android:clickable="false"
        android:focusable="false" />

</RelativeLayout>

Adapter with ClickListener

public class MultipleRecyclerViewAdapter extends RecyclerView
        .Adapter<MultipleRecyclerViewAdapter
        .DataObjectHolder> {

    private List<MultipleData> mList;
    private static MultipleClickListener sClickListener;

    MultipleRecyclerViewAdapter(List<MultipleData> mList) {
        this.mList = mList;
    }

    static class DataObjectHolder extends RecyclerView.ViewHolder
            implements View
            .OnClickListener {

        TextView mTextView;
        RadioButton mRadioButton;

         DataObjectHolder(View itemView) {
            super(itemView);
            mTextView = (TextView) itemView.findViewById(R.id.multiple_list_item_text);
            mRadioButton = (RadioButton) itemView.findViewById(R.id.multiple_list_item_check_button);
            itemView.setOnClickListener(this);
        }

        @Override
        public void onClick(View v) {
            sClickListener.onItemClick(getAdapterPosition(), v);
        }
    }

    void changedData(int position) {
            if (mList.get(position).isBoolean()) {
                mList.get(position).setBoolean(false);
            } else {
                mList.get(position).setBoolean(true);
            }
        notifyDataSetChanged();
    }

    void setOnItemClickListener(MultipleClickListener myClickListener) {
        this.sClickListener = myClickListener;
    }

    @Override
    public DataObjectHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.multiple_list_item, parent, false);

        DataObjectHolder dataObjectHolder = new DataObjectHolder(view);
        return dataObjectHolder;
    }

    @Override
    public void onBindViewHolder(DataObjectHolder holder, int position) {
        holder.mTextView.setText(mList.get(position).getTitle());
        holder.mRadioButton.setChecked(mList.get(position).isBoolean());
    }

    @Override
    public int getItemCount() {
        return mList.size();
    }

    interface MultipleClickListener {
        void onItemClick(int position, View v);
    }


}

Activity or fragment

public class MultipleFragment extends Fragment implements MultipleRecyclerViewAdapter.MultipleClickListener{

    MultipleRecyclerViewAdapter mAdapter;

    public MultipleFragment() {
        // Required empty public constructor
    }

    public static MultipleFragment newInstance() {
        return new MultipleFragment();
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.multiple_fragment, container, false);

        RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.multiple_fragment_recycler_view);

        MultipleData hendrix = new MultipleData("Jimi Hendrix", false);
        MultipleData bowie = new MultipleData("David Bowie", false);
        MultipleData morrison = new MultipleData("Jim Morrison", false);

        MultipleData presley = new MultipleData("Elvis Presley", false);
        MultipleData jagger = new MultipleData("Mick Jagger", false);
        MultipleData cobain = new MultipleData("Kurt Cobain", false);

        MultipleData dylan = new MultipleData("Bob Dylan", false);
        MultipleData lennon = new MultipleData("John Lennon", false);
        MultipleData mercury = new MultipleData("Freddie Mercury", false);

        MultipleData elton = new MultipleData("Elton John", false);
        MultipleData clapton = new MultipleData("Eric Clapton", false);

        List<MultipleData> list = new ArrayList<>();
        list.add(0, hendrix);
        list.add(1, bowie);
        list.add(2, morrison);

        list.add(3, presley);
        list.add(4, jagger);
        list.add(5, cobain);

        list.add(6, dylan);
        list.add(7, lennon);
        list.add(8, mercury);

        list.add(9, elton);
        list.add(10, clapton);

        mAdapter = new MultipleRecyclerViewAdapter(list);
        recyclerView.setAdapter(mAdapter);
        recyclerView.setHasFixedSize(true);
        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getActivity());

        recyclerView.setLayoutManager(layoutManager);
        mAdapter.setOnItemClickListener(this);

        return view;
    }

    @Override
    public void onItemClick(int position, View v) {
        mAdapter.changedData(position);
    }
}

You can see this example in GitHub and this post for multiple choice, and this post for single choice Happy code!!!