java - 如何从 Activity 的弹出菜单中选择回收者 View 的复选框？

Question

我有一个带有复选框的联系人列表。另外，我还必须在工具栏上单击图像时创建一个弹出菜单。

弹出菜单显示全选选项。

所以单击全选我希望列表中的所有复选框都被选中。

我在适配器中定义的复选框。

适配器:

    public class InviteAdapter extends RecyclerView.Adapter<InviteAdapter.MyViewHolder> {

    private ArrayList<Contact> contactArrayList;
    private Context mContext;

    public class MyViewHolder extends RecyclerView.ViewHolder {
        public TextView name;
        private CheckBox checkBox;

        public MyViewHolder(View view) {
            super(view);
            name = (TextView) view.findViewById(R.id.textContactName);
            checkBox = (CheckBox) view.findViewById(R.id.checkBox);

        }
    }


    public InviteAdapter(Context context, ArrayList<Contact> contactArrayList) {
        this.contactArrayList = contactArrayList;
        this.mContext = context;

    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.invite_contact_item, parent, false);

        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        Contact contact = contactArrayList.get(position);
        holder.name.setText(contact.getmFullName());



    }

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

}

Activity :

    public class InviteContactsActivity extends AppCompatActivity {

    private RecyclerView recyclerView;
    private InviteAdapter adapter;
    private ArrayList<Contact> contactList;
    private ContactTableHelper contactDb;


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


        Toolbar toolbar = (Toolbar) findViewById(R.id.main_toolbar);
        TextView mTitle = (TextView) findViewById(R.id.toolbar_title);

        mTitle.setText("Invite Contacts");


        if (toolbar != null) {

            toolbar.setTitle("");
            setSupportActionBar(toolbar);

        }
        ImageView back = (ImageView)findViewById(R.id.imageBack);

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

                finish();

            }
        });

        final ImageView selectAll = (ImageView)findViewById(R.id.selectAll);

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

                PopupMenu popup = new PopupMenu(InviteContactsActivity.this,selectAll);

                popup.getMenuInflater().inflate(R.menu.pop_up_menu, popup.getMenu());

                popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
                    public boolean onMenuItemClick(MenuItem item) {



                        return true;
                    }
                });

                popup.show();
            }
        });


        contactDb = new ContactTableHelper(InviteContactsActivity.this);

        contactList = contactDb.getAllContacts();

        recyclerView = (RecyclerView) findViewById(R.id.recycler_view);

        recyclerView.setHasFixedSize(true);
        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(InviteContactsActivity.this);
        recyclerView.setLayoutManager(mLayoutManager);
        recyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));
        recyclerView.setItemAnimator(new DefaultItemAnimator());

        adapter = new InviteAdapter(InviteContactsActivity.this, contactList);
        recyclerView.setAdapter(adapter);
    }
}

谢谢你..

编辑:

我是这样做的:

Activity 中:

            popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
                public boolean onMenuItemClick(MenuItem item) {

                    for (Contact contact: mContactList) {

                        contact.setSelected(true);


                    }

                    mAdapter.notifyItemRangeChanged(); // how to do here?

                    return true;
                }
            });

在适配器中:

@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
    Contact contact = contactArrayList.get(position);
    holder.name.setText(contact.getmFullName());

    if(contact.getSelected() == true)
    {
        holder.checkBox.setChecked(true);
    }

}

请检查并告诉我我缺少什么？

Answer 1

在适配器类中创建一个方法:

public void toggleContactsSelection( boolean isSelected ) {
   for( Contact contact : contactArrayList ) {
       contact.setSelected(isSelected);
   }
   notifyDataSetChanged(); // OR you can use notifyItemRangeChanged - which ever suits your needs
}

在你的 onBindViewHolder 方法中:

@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
    Contact contact = contactArrayList.get(position);
    holder.name.setText(contact.getmFullName());
    holder.checkBox.setChecked(contact.getSelected());
}

每当您需要选择所有/取消选择所有联系人时，调用适配器的方法:

inviteAdapter.toggleContactsSelection(true); //Selects all contacts
inviteAdapter.toggleContactsSelection(false); //Unselect all contacts

以下是 Recycler 适配器中涉及的方法及其使用说明的链接:

https://developer.android.com/reference/android/support/v7/widget/RecyclerView.Adapter.html