我有一个示例应用程序，其中列出了我的Android手机中的联系人，我可以搜索它们。但是，通常会将联系人列出两次。我只希望它们被列出一次。我应该在代码中更改什么来解决这个问题？我在下面发布了我的代码的相关部分。
我在这里尝试how to remove duplicate contacts from arraylist，但我无法根据自己的需要修改代码。
MainActivity.java
package com.example.chris.contactlistcustomlistview;
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");
// retrieves contact information
LoadContact loadContact = new LoadContact();
loadContact.execute();
// let's set up our search box,
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) {
// when the text in searchView changes, call the filter function
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();
}
//what's happening here? For every user in the phonebook, show an image, the name, number, an id and maybe a checkbox?
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
// when DoInBackground is finished, when we have our phone number, name etc... display the results in our listview.
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();
}
}
SelectUserAdapter.java
package com.example.chris.contactlistcustomlistview;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Build;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
/**
* Created by Chris on 25/03/2016.
*/
public class SelectUserAdapter extends BaseAdapter {
public List<SelectUser> _data;
private ArrayList<SelectUser> arraylist;
Context _c;
ViewHolder v;
// RoundImage roundedImage;
public SelectUserAdapter(List<SelectUser> selectUsers, Context context) {
_data = selectUsers;
_c = context;
this.arraylist = new ArrayList<SelectUser>();
this.arraylist.addAll(_data);
}
@Override
public int getCount() {
return _data.size();
}
@Override
public Object getItem(int i) {
return _data.get(i);
}
@Override
public long getItemId(int i) {
return i;
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
public View getView(int i, View convertView, ViewGroup viewGroup) {
View view = convertView;
if (view == null) {
LayoutInflater li = (LayoutInflater) _c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = li.inflate(R.layout.inflate_listview, null);
Log.e("Inside", "here--------------------------- In view1");
} else {
view = convertView;
Log.e("Inside", "here--------------------------- In view2");
}
// we are making a cell format in the ListView, which will contain info like
// number, name... the layout for this, with name, no, pic etc...
// is contained in inflate_listview.xml, which describes how each cell data
// loads into the listview
v = new ViewHolder();
// So, for example, title is cast to the name id, in activity main,
// phone is cast to the id called no etc
v.title = (TextView) view.findViewById(R.id.name);
v.check = (CheckBox) view.findViewById(R.id.check);
v.phone = (TextView) view.findViewById(R.id.no);
// v.imageView = (ImageView) view.findViewById(R.id.pic);
// for each new cell with title, name, number etc...
//
final SelectUser data = (SelectUser) _data.get(i);
v.title.setText(data.getName());
v.check.setChecked(data.getCheckedBox());
v.phone.setText(data.getPhone());
Log.e("Image Thumb", "--------------" + data.getThumb());
view.setTag(data);
return view;
}
// Filter Class
public void filter(String charText) {
charText = charText.toLowerCase(Locale.getDefault());
// _data is our list of Users, or contacts
_data.clear();
// If there is nothing in the searchbox,
// then show all the contacts
if (charText.length() == 0) {
_data.addAll(arraylist);
// or else....
} else {
for (SelectUser wp : arraylist) {
// If a contact's phone number matches the input thus far that the user
// is filtering for, then include it in the listview.
if (wp.getPhone().toLowerCase(Locale.getDefault())
.contains(charText)) {
_data.add(wp);
}
}
}
notifyDataSetChanged();
}
static class ViewHolder {
// In each cell in the listview show a name and phone number
// ImageView imageView;
TextView title, phone;
CheckBox check;
}
}
答案 0 :(得分：0)
试试这个，我不确定它会解决这个问题。
if (selectUsers.indexOf(selectUser) == -1) {
selectUsers.add(selectUser);
}
答案 1 :(得分：0)
public class MainActivity extends Activity {
Cursor cursor;
ListView mainListView;
ArrayList hashMapsArrayList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (cursor != null) {
cursor.moveToFirst();}
try {
cursor = getApplicationContext().getContentResolver()
.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);
int Idx = cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.CONTACT_ID);
int nameIdx = cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME);
int phoneNumberIdx = cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER);
int photoIdIdx = cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.PHOTO_THUMBNAIL_URI);
cursor.moveToFirst();
Set<String> ids = new HashSet<>();
do {
System.out.println("=====>in while");
String contactid=cursor.getString(Idx);
if (!ids.contains(contactid)) {
ids.add(contactid);
HashMap<String, String> hashMap = new HashMap<String, String>();
String name = cursor.getString(nameIdx);
String phoneNumber = cursor.getString(phoneNumberIdx);
String image = cursor.getString(photoIdIdx);
System.out.println("Id--->"+contactid+"Name--->"+name);
System.out.println("Id--->"+contactid+"Number--->"+phoneNumber);
if (!phoneNumber.contains("*")) {
hashMap.put("contactid", "" + contactid);
hashMap.put("name", "" + name);
hashMap.put("phoneNumber", "" + phoneNumber);
hashMap.put("image", "" + image);
// hashMap.put("email", ""+email);
if (hashMapsArrayList != null) {
hashMapsArrayList.add(hashMap);}
// hashMapsArrayList.add(hashMap);
}
}
} while (cursor.moveToNext());
} catch (Exception e) {
e.printStackTrace();
} finally {
if (cursor != null) {
cursor.close();
}
}
}
}