[FIXED] How to access MyViewHolder inner class views outside RecyclerViewAdapter?

Issue

I have a MyViewHolder inner class inside RecyclerViewAdapter inside Checklistitems class. I want access elements of MyViewHolder in method onOptionItemSelected(). Here, I have three classes, and because of that, it becomes more complicated for me.

public class ChecklistItems extends AppCompatActivity {

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

public class ChecklistAdapter extends RecyclerView.Adapter  <RecyclerView.ViewHolder>{

    @NonNull
    @Override
    public RecyclerView.ViewHolder  onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        return new ChecklistChildViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
      
    }

    @Override
    public int getItemCount() {
        return x;
    }

    public class ChecklistChildViewHolder extends RecyclerView.ViewHolder{
        CheckBox checkBox;
        ImageView delete, move;

        ChecklistChildViewHolder(@NonNull View itemView) {
            super(itemView);
            checkBox = itemView.findViewById(R.id.checkbox_child);
            delete = itemView.findViewById(R.id.delete_child);
            move = itemView.findViewById(R.id.move_child);
            delete.setVisibility(View.INVISIBLE);
        }
    }
}

@Override
public boolean onOptionsItemSelected(@NonNull MenuItem item) {
    switch (item.getItemId()){

        case R.id.edit:
            isEditChecklist = true;
            // My problem is in here
            // I want to set visibility of a delete imageView here, when I clicked edit button in the toolbar
            // I have created these objects in order to access the ChecklistChildViewHolder class but the third line below asks
            // for a parameter, I don't know what to pass

            ChecklistItems checklistItems = new ChecklistItems();
            ChecklistItems.ChecklistAdapter checklistAdapter = checklistItems.new ChecklistAdapter();
            ChecklistAdapter.ChecklistChildViewHolder checklistChildViewHolder = checklistAdapter.new ChecklistChildViewHolder();
    }
    return true;
}
}

Any help would be appreciated.

Solution

Update your code like this

Your Activity

public class ChecklistItems extends AppCompatActivity {

private ChecklistAdapter mAdapter;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_checklist_items);
    mAdapter = new ChecklistAdapter();
}

@Override
public boolean onOptionsItemSelected(@NonNull MenuItem item) {
    switch (item.getItemId()){

        case R.id.edit:
            isEditChecklist = true;
            mAdapter.updateItems(true);
    }
    return true;
}
}

Your Adapter

public class ChecklistAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{

private boolean isEnableDelete = false;

@NonNull
@Override
public RecyclerView.ViewHolder  onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    return new ChecklistChildViewHolder(view);
}

@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {

    ((ChecklistChildViewHolder) holder).onBind(isEnableDelete);
}

@Override
public int getItemCount() {
    return x;
}

public void updateItems(boolean isEnableDelete){
    this.isEnableDelete = isEnableDelete;
    notifyDataSetChanged();

}

public class ChecklistChildViewHolder extends RecyclerView.ViewHolder{
    CheckBox checkBox;
    ImageView delete, move;

    ChecklistChildViewHolder(@NonNull View itemView) {
        super(itemView);
        checkBox = itemView.findViewById(R.id.checkbox_child);
        delete = itemView.findViewById(R.id.delete_child);
        move = itemView.findViewById(R.id.move_child);
        delete.setVisibility(View.INVISIBLE);
    }

    public void onBind(boolean isEnableDelete){
        if (isEnableDelete){
            delete.setVisibility(View.VISIBLE);
        }else delete.setVisibility(View.INVISIBLE);
    }
}
}

Answered By - Gobu CSG
Answer Checked By - Candace Johnson (JavaFixing Volunteer)