java - 删除自定义 ListView 中的重复联系人

Question

我正在使用https://trinitytuts.com/get-contact-list-and-show-in-custom-listview-android/#在 ListView 中获取联系人列表的教程。它工作正常，但提供了重复的联系人。有人可以指导解决此问题并仅在 ListView 中进行一次联系吗？

主要 Activity 代码如下:

import android.app.Activity;
import android.content.ContentResolver;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SearchView;
import android.widget.Toast;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;


public class MainActivity extends Activity {

    // ArrayList
    ArrayList<SelectUser> selectUsers;
    List<SelectUser> temp;
    // Contact List
    ListView listView;
    // Cursor to load contacts list
    Cursor phones, email;

    // Pop up
    ContentResolver resolver;
    SearchView search;
    SelectUserAdapter adapter;

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

        selectUsers = new ArrayList<SelectUser>();
        resolver = this.getContentResolver();
        listView = (ListView) findViewById(R.id.contacts_list);

        phones = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME + " ASC");
        LoadContact loadContact = new LoadContact();
        loadContact.execute();

        search = (SearchView) findViewById(R.id.searchView);

        //*** setOnQueryTextListener ***
        search.setOnQueryTextListener(new SearchView.OnQueryTextListener() {

            @Override
            public boolean onQueryTextSubmit(String query) {
                // TODO Auto-generated method stub

                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {
                // TODO Auto-generated method stub
                adapter.filter(newText);
                return false;
            }
        });
    }

    // Load data on background
    class LoadContact extends AsyncTask<Void, Void, Void> {
        @Override
        protected void onPreExecute() {
            super.onPreExecute();

        }

        @Override
        protected Void doInBackground(Void... voids) {
            // Get Contact list from Phone

            if (phones != null) {
                Log.e("count", "" + phones.getCount());
                if (phones.getCount() == 0) {
                    Toast.makeText(MainActivity.this, "No contacts in your contact list.", Toast.LENGTH_LONG).show();
                }

                while (phones.moveToNext()) {
                    Bitmap bit_thumb = null;
                    String id = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.CONTACT_ID));
                    String name = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
                    String phoneNumber = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                    String EmailAddr = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA2));
                    String image_thumb = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.PHOTO_THUMBNAIL_URI));
                    try {
                        if (image_thumb != null) {
                            bit_thumb = MediaStore.Images.Media.getBitmap(resolver, Uri.parse(image_thumb));
                        } else {
                            Log.e("No Image Thumb", "--------------");
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }

                    SelectUser selectUser = new SelectUser();
                    selectUser.setThumb(bit_thumb);
                    selectUser.setName(name);
                    selectUser.setPhone(phoneNumber);
                    selectUser.setEmail(id);
                    selectUser.setCheckedBox(false);
                    selectUsers.add(selectUser);
                }
            } else {
                Log.e("Cursor close 1", "----------------");
            }
            //phones.close();
            return null;
        }

        @Override
        protected void onPostExecute(Void aVoid) {
            super.onPostExecute(aVoid);
            adapter = new SelectUserAdapter(selectUsers, MainActivity.this);
            listView.setAdapter(adapter);

            // Select item on listclick
            listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

                    Log.e("search", "here---------------- listener");

                    SelectUser data = selectUsers.get(i);
                }
            });

            listView.setFastScrollEnabled(true);
        }
    }

    @Override
    protected void onStop() {
        super.onStop();
        phones.close();
    }
}

Answer 1

为什么不使用Set？尝试将您的联系人存储在对象中，并将该对象存储在Set中>。请记住重写该 Object 的 equals 方法，您需要根据该方法消除重复项。

更多内容请阅读这里 http://www.java2novice.com/java-collections-and-util/hashset/duplicate/