How to make checkboxes visible in RecyclerView on a button click from activity?

Question

I have a button and a recycler view in an activity. Inside each row of the recycler view (viewholder in adapter class), I have an invisible checkbox. What I want to happen is when the user clicks the button, the checkboxes in each row should become visible. How can I achieve this?

Answer 1

Use a boolean flag to do it on button click set that flag true and set notifyDataSetChanged() for that adapter And in Adapter onBind chek that flag if flag true then set visibility VISIBLE for Checkbox else GONE

Answer 2

you can do it in Viewholder like that :

Entire viewholder:

holder.mycheckbox.setVisibility(View.GONE);

Answer 3

Try this example, Like the Jyotish Biswas explained I have done it with an example, I thought this explanation will clear your doubts.

ArrayList<Model> mModelList;
TestRecyclerViewAdapter mTestRecyclerViewAdapter;

RecyclerView mRecyclerView;

private String dummy_groups[] = {

        "Group 1",
        "Group 2",
        "Group 3",
        "Group 4",
        "Group 5",
        "Group 6",
        "Group 7",
        "Group 8"


};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    checkAllBoxes = findViewById(R.id.checkAllBoxes);


    mRecyclerView = findViewById(R.id.recyclerView);
    mRecyclerView.setHasFixedSize(true);

    ArrayList<Model> recordsDataLists = prepareData();
    mRecyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this));
    mTestRecyclerViewAdapter = new TestRecyclerViewAdapter(recordsDataLists);
    mRecyclerView.setAdapter(mTestRecyclerViewAdapter);

    mModelList = prepareData();
    mTestRecyclerViewAdapter.updateData(mModelList);

    checkAllBoxes.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            for (int i = 0; i < mTestRecyclerViewAdapter.getItemCount(); i++)
            {
                mModelList.get(i).setChecked(true);
                mTestRecyclerViewAdapter.notifyDataSetChanged();
            }
        }
    });
}

private ArrayList<Model> prepareData() {
    ArrayList<Model> theImage = new ArrayList<>();
    for (int i = 0; i < dummy_groups.length ; i++){
        Model createList = new Model();
        createList.setName(dummy_groups[i]);
        //createList.setChecked(true);
        theImage.add(createList);
    }
    return theImage;
}

Adapter class :

public class TestRecyclerViewAdapter extends 
RecyclerView.Adapter<TestRecyclerViewAdapter.TestRecyclerViewHolder> {

ArrayList<Model> mModel;

public TestRecyclerViewAdapter(ArrayList<Model> model) {
    mModel = model;
}

public void updateData(ArrayList<Model> modelArrayList){
    mModel.clear();
    mModel.addAll(modelArrayList);
    notifyDataSetChanged();
}

@NonNull
@Override
public TestRecyclerViewHolder onCreateViewHolder(@NonNull ViewGroup 
 parent, int viewType) {
    View view = 





LayoutInflater.from(parent.getContext()).inflate(R.layout.recylerview_layout,parent,false);
        return new TestRecyclerViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull TestRecyclerViewHolder holder, int position) {

        Model model = mModel.get(position);

        if (model.isChecked())
        {
            holder.checkBoxes.setVisibility(View.VISIBLE);
        }

    }

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

    public class TestRecyclerViewHolder extends RecyclerView.ViewHolder{

        CheckBox checkBoxes;

        public TestRecyclerViewHolder(@NonNull View itemView) {
            super(itemView);

            checkBoxes = itemView.findViewById(R.id.checkBoxes);
        }
    }
}

recylcerview.layout.xml

    <LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:weightSum="10"
    android:orientation="horizontal"
    android:layout_height="50dp">


    <TextView
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="8"
        android:text="@string/app_name"
        android:layout_gravity="center"
        android:textSize="25sp"
        android:gravity="center"
        android:textStyle="bold"/>


    <CheckBox
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="2"
        android:layout_gravity="center"
        android:gravity="center"
        android:id="@+id/checkBoxes"
        android:visibility="gone"/>


</LinearLayout>

Model.java

public class Model {

    public boolean isChecked;

    public String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public boolean isChecked() {
        return isChecked;
    }

    public void setChecked(boolean checked) {
        isChecked = checked;
    }
}

Try this and let me know if you have any issues.