Checkboxes in RecyclerView in Android

 A simple example of using checkboxes in recycler view

A recyclerview recycles components, so the view is recreated again once you scroll up and down. To solve this problem, we will first create an empty list of deliveryNoteModels that we will use to store selected orders.

Creating a list of checkboxes isn’t a difficult mission. Adding a “select all” is arguably not too complicated as well.
But… what if we wanted to add subcategories? And… implement this in….. a recyclerView? Now this becomes a bit more complicated and confusing, and what is easier than finding a code that does exactly that with a simple explanation? So here we go…

TestActivity.java

	Lets get started with layouts first TestActivity To create each checkbox option, create a CheckBox in your layout.  Because a set of checkbox options lets the user select multiple items, each checkbox is managed separately, and you must register a click listener for each one. public class TestActivity extends AppCompatActivity {
	@Override
	protected void onCreate(@Nullable Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.test_activity);
	RecyclerView recycler = (RecyclerView) findViewById(R.id.recycler);
	recycler.setLayoutManager(new LinearLayoutManager(this));
	TestAdapter adapter = new TestAdapter();
	adapter.setCallback(new TestAdapter.Callback() {
	@Override
	public void onCheckedChanged(String item, boolean isChecked) {
	// Do what you want :)
	}
	});
	adapter.addItem("Foo");
	adapter.addItem("Bar");
	adapter.notifyDataSetChanged();
	}
	} ======================================================================================= Lets get started with layouts first TestAdapter  TestAdapter.java // This is your reyclerview adapter public class TestAdapter extends RecyclerView.Adapter<TestAdapter.ViewHolder> { // Just storing strings for example private List<String> items = new ArrayList<>(); // A callback that gets invoked when an item is checked (or unchecked) private Callback callback; // Call this to add strings to the adapter public void addItem(String item) { items.add(item); } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { return new ViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_with_checkbox, parent, false)); } @Override public int getItemCount() { return items.size(); } @Override public void onBindViewHolder(ViewHolder holder, int position) { holder.bind(items.get(position)); } // Sets the callback public void setCallback(Callback callback) { this.callback = callback; } // Callback interface, used to notify when an item's checked status changed public interface Callback { void onCheckedChanged(String item, boolean isChecked); } // Our view holder public static class ViewHolder extends RecyclerView.ViewHolder { private CheckBox checkBox; public ViewHolder(View itemView) { super(itemView); // Find the checkbox view in the layout checkBox = (CheckBox) itemView.findViewById(R.id.checkbox); } void bind(String s) { // Set the text checkBox.setText(s); // Listen to changes (i.e. when the user checks or unchecks the box) checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { // Invoke the callback if(callback != null) callback.onCheckedChanged(s, isChecked); } }); } } }

To create each checkbox option, create a CheckBox in your layout. Because a set of checkbox options lets the user select multiple items, each checkbox is managed separately, and you must register a click listener for each one.

CheckBox belongs to android.widget.CheckBox class. Android CheckBox class is the subclass of CompoundButton class. It is generally used in a place where user can select one or more than choices from a given list of choices. For example, selecting hobbies.