android - 当我滚动 recyclerview 时，recyclerview 项目会发生变化

Question

当我在 recyclerview 中选择一个项目时，会自动选择多个项目

我正在做的是

i just want to fetch contacts with no duplication and list all contacts in recyclerview And make visible two textviews (one is for number and second is for name)Its Done But The problem is

when i click on an item it gets clicked 4 times (for example if i click on an item it make visible two textviews but the same item with same name and number get visible like with i have clicked 4 items and see pics )

适配器类

    package "";

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.SwitchCompat;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CompoundButton;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.example.altu.calllocker.R;
import com.example.altu.calllocker.model.ContactsModel;

import java.util.HashMap;
import java.util.List;


public class ContactsAdapter extends RecyclerView.Adapter<ContactsAdapter.ContactsViewHolder> {
    List<ContactsModel> list;
    Context context;
    public static HashMap<String, String> hashMapBlock;

    public ContactsAdapter(List<ContactsModel> list, Context context) {
        this.list = list;
        this.context = context;
    }

    @Override
    public ContactsViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.contacts_item, parent, false);
        context = parent.getContext();
        hashMapBlock = new HashMap<>();
        ContactsViewHolder viewHolder = new ContactsViewHolder(view);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(final ContactsViewHolder holder, final int position) {
        holder.txtno.setText(list.get(position).get_id());
        holder.txt_contactname.setText(list.get(position).getDisplay_name());
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.e("position", list.get(position).get_id() + "  " + list.get(position).getData1() + "  " + list.get(position).getDisplay_name());
                if (holder.linearLayout.getVisibility() == View.VISIBLE) {
                    holder.linearLayout.setVisibility(View.GONE);
                } else {
                    holder.linearLayout.setVisibility(View.VISIBLE);
                    holder.txt_contactName.setText(list.get(position).getDisplay_name());
                    holder.txt_contact_no.setText(list.get(position).getData1());
                }

            }
        });
        holder.switchBlock.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (isChecked) {
                    hashMapBlock.put(list.get(position).getData1(), "block");
                    Log.e("block", list.get(position).getData1());
                    Toast.makeText(context, "block" + "  " + list.get(position).getData1(), Toast.LENGTH_SHORT).show();
                } else {
                    hashMapBlock.remove(list.get(position).getData1());
                    Log.e("unblock", list.get(position).getData1());
                    Toast.makeText(context, "unblock" + "  " + list.get(position).getData1(), Toast.LENGTH_SHORT).show();
                }
            }
        });

    }

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

    public class ContactsViewHolder extends RecyclerView.ViewHolder {
        TextView txt_contactname;
        TextView txt_contactName;
        TextView txt_contact_no;
        LinearLayout linearLayout;
        SwitchCompat switchBlock;
        TextView txtno;

        public ContactsViewHolder(View itemView) {

            super(itemView);
            this.txtno = (TextView) itemView.findViewById(R.id.txtno);
            this.txt_contactname = (TextView) itemView.findViewById(R.id.txt_contactName);
            this.txt_contactName = (TextView) itemView.findViewById(R.id.txt_contact_name);
            this.txt_contact_no = (TextView) itemView.findViewById(R.id.txt_contact_no);
            this.linearLayout = (LinearLayout) itemView.findViewById(R.id.linearlayout);
            this.switchBlock = (SwitchCompat) itemView.findViewById(R.id.switchButton_block);


        }
    }
}

MainActivity，我将所有联系人获取到 recyclerview

 package "";

import android.app.ProgressDialog;
import android.content.ContentResolver;
import android.database.Cursor;
import android.os.AsyncTask;
import android.provider.ContactsContract;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.widget.Toast;

import com.example.altu.calllocker.R;
import com.example.altu.calllocker.adapter.ContactsAdapter;
import com.example.altu.calllocker.customclass.SimpleDividerItemDecoration;
import com.example.altu.calllocker.model.ContactsModel;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    RecyclerView recyclerview_contacts;
    List<ContactsModel> contactVOList;
    ProgressDialog progressDialog;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bindview();
        new Thread(new Task()).start();
        progressDialog.dismiss();


        //adapter = new ContactsAdapter(contactlist, getApplicationContext());
        //recyclerview_contacts.setAdapter(adapter);

    }

    public void bindview() {
        recyclerview_contacts = (RecyclerView) findViewById(R.id.recyclerview_contacts);
        contactVOList = new ArrayList<>();
        recyclerview_contacts.setHasFixedSize(true);
        LinearLayoutManager llm = new LinearLayoutManager(MainActivity.this);
        llm.setOrientation(LinearLayoutManager.VERTICAL);
        recyclerview_contacts.setLayoutManager(llm);
        SimpleDividerItemDecoration itemDecoration = new SimpleDividerItemDecoration(this);
        recyclerview_contacts.addItemDecoration(itemDecoration);
        progressDialog = new ProgressDialog(this);
        progressDialog.setMessage("Loading.....");
        progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
        progressDialog.setMax(100);
        progressDialog.setProgress(0);
        progressDialog.show();
    }

    class Task implements Runnable {
        @Override
        public void run() {

            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    getAllContact();
                }
            });


        }

    }



    private void getAllContact() {
        if (contactVOList.size() > 0) {
            contactVOList.clear();
        }
        //  List<ContactsModel> contactVOList = new ArrayList();
        ContactsModel contactVO;

        ContentResolver contentResolver = getContentResolver();
        Cursor cursor = contentResolver.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME + " ASC");
        if (cursor.getCount() > 0) {
            while (cursor.moveToNext()) {

                int hasPhoneNumber = Integer.parseInt(cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER)));
                if (hasPhoneNumber > 0) {
                    String id = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
                    String name = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));

                    contactVO = new ContactsModel();
                    contactVO.setDisplay_name(name);
                    contactVO.set_id(id);

                    Cursor phoneCursor = contentResolver.query(
                            ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                            null,
                            ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?",
                            new String[]{id},
                            null);
                    if (phoneCursor.moveToNext()) {
                        String phoneNumber = phoneCursor.getString(phoneCursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                        contactVO.setData1(phoneNumber);
                    }

                    phoneCursor.close();

                    Cursor emailCursor = contentResolver.query(
                            ContactsContract.CommonDataKinds.Email.CONTENT_URI,
                            null,
                            ContactsContract.CommonDataKinds.Email.CONTACT_ID + " = ?",
                            new String[]{id}, null);
                    while (emailCursor.moveToNext()) {
                        String emailId = emailCursor.getString(emailCursor.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA));
                    }
                    emailCursor.close();
                    contactVOList.add(contactVO);
                }

            }

            ContactsAdapter contactAdapter = new ContactsAdapter(contactVOList, getApplicationContext());
            //recyclerview_contacts.setLayoutManager(new LinearLayoutManager(this));
            recyclerview_contacts.setAdapter(contactAdapter);
            contactAdapter.notifyDataSetChanged();
            Log.e("size", String.valueOf(contactVOList.size()));
        }
    }

}

image 1 image2 with auto selection

Answer 1

您应该在 ViewHolder 中设置 OnclickListener 并使用 getLayoutPosition() 方法获取被点击项目的位置。

 public class ContactsViewHolder extends RecyclerView.ViewHolder {
    TextView txt_contactname;
    TextView txt_contactName;
    TextView txt_contact_no;
    LinearLayout linearLayout;
    SwitchCompat switchBlock;
    TextView txtno;

    public ContactsViewHolder(View itemView) {

        super(itemView);
        this.txtno = (TextView) itemView.findViewById(R.id.txtno);
        this.txt_contactname = (TextView) itemView.findViewById(R.id.txt_contactName);
        this.txt_contactName = (TextView) itemView.findViewById(R.id.txt_contact_name);
        this.txt_contact_no = (TextView) itemView.findViewById(R.id.txt_contact_no);
        this.linearLayout = (LinearLayout) itemView.findViewById(R.id.linearlayout);
        this.switchBlock = (SwitchCompat) itemView.findViewById(R.id.switchButton_block);

        itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                 int position =getLayoutPosition();
                //Your logic

            }
        });


    }
}