1.手机上联系人数据库文件（contact2.db）存放目录：/data/data/com.android.providers.contacts
2.联系人源码位于工程目录：packages\apps\Contacts
3.数据库中一堆表，但常用这些表：data、phone_lookup、contacts、raw_contacts
@ContactsDatabaseHelper.java
public interface Tables {public static final String CONTACTS = "contacts";public static final String DELETED_CONTACTS = "deleted_contacts";public static final String RAW_CONTACTS = "raw_contacts";public static final String STREAM_ITEMS = "stream_items";public static final String STREAM_ITEM_PHOTOS = "stream_item_photos";public static final String PHOTO_FILES = "photo_files";public static final String PACKAGES = "packages";public static final String MIMETYPES = "mimetypes";public static final String PHONE_LOOKUP = "phone_lookup";public static final String NAME_LOOKUP = "name_lookup";public static final String AGGREGATION_EXCEPTIONS = "agg_exceptions";public static final String SETTINGS = "settings";public static final String DATA = "data";public static final String GROUPS = "groups";public static final String PRESENCE = "presence";public static final String AGGREGATED_PRESENCE = "agg_presence";public static final String NICKNAME_LOOKUP = "nickname_lookup";public static final String CALLS = "calls";public static final String CALLS_SYNC = "calls_sync";public static final String STATUS_UPDATES = "status_updates";public static final String PROPERTIES = "properties";public static final String ACCOUNTS = "accounts";public static final String VISIBLE_CONTACTS = "visible_contacts";public static final String DIRECTORIES = "directories";public static final String DEFAULT_DIRECTORY = "default_directory";public static final String SEARCH_INDEX = "search_index";public static final String VOICEMAIL_STATUS = "voicemail_status";//add by lumospublic static final String GROUP_LOOKUP = "group_lookup";public static final String SPAM_ADDRESS = "spam_address";public static final String SPEED_DIAL = "speed_dial";// This list of tables contains auto-incremented sequences.public static final String[] SEQUENCE_TABLES = new String[] {CONTACTS,RAW_CONTACTS,STREAM_ITEMS,STREAM_ITEM_PHOTOS,PHOTO_FILES,DATA,GROUPS,CALLS,DIRECTORIES};
4.查询时使用Phone.CONTENT_URI会关联查询多张表（contacts、raw_contacts、data？详情查看源码ContactsProvider2.java） ，返回的结果中已经包含了很多信息，如联系人姓名、电话号码等，基本可以满足一般需求
@ContactsProvider2.java
matcher.addURI(ContactsContract.AUTHORITY, "data/phones", PHONES)
5.代码实现（异步加载使用rxjava）
权限申请：<uses-permission android:name="android.permission.READ_CONTACTS"/>
远程库依赖： compile 'io.reactivex:rxandroid:1.1.0'
compile 'io.reactivex:rxjava:1.1.0'
package com.example.lance.contactdbtest;import android.app.ListActivity;import android.database.Cursor;import android.os.Bundle;import android.provider.ContactsContract;import android.util.Log;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.TextView;import java.util.ArrayList;import java.util.List;import rx.Observable;import rx.Subscriber;import rx.android.schedulers.AndroidSchedulers;import rx.schedulers.Schedulers;public class MainActivity extends ListActivity {MyAdapter adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//setContentView(R.layout.activity_main);adapter = new MyAdapter();getListView().setAdapter(adapter);Observable.create(new Observable.OnSubscribe<List<Contact>>() {@Overridepublic void call(Subscriber<? super List<Contact>> subscriber) {try {Cursor cursor = getContentResolver().query(monDataKinds.Phone.CONTENT_URI, new String[]{monDataKinds.Phone.DISPLAY_NAME_PRIMARY, monDataKinds.Phone.NUMBER}, null, null, null);if(cursor != null){int nameId = cursor.getColumnIndex(monDataKinds.Phone.DISPLAY_NAME_PRIMARY);int numberId = cursor.getColumnIndex(monDataKinds.Phone.NUMBER);List<Contact> contacts = new ArrayList<Contact>();while (cursor.moveToNext()){Contact contact = new Contact();contact.name = cursor.getString(nameId);contact.number = cursor.getString(numberId);contacts.add(contact);}subscriber.onNext(contacts);subscriber.onCompleted();}} catch (Exception e) {if (subscriber.isUnsubscribed()) {//refuse to emit onError if already unsubscribedreturn;}subscriber.onError(e);}}}).subscribeOn(Schedulers.newThread()).observeOn(AndroidSchedulers.mainThread()).subscribe(new Subscriber<List<Contact>>() {@Overridepublic void onCompleted() {Log.i("test", "onCompleted");}@Overridepublic void onError(Throwable e) {Log.e("test", "onError");e.printStackTrace();}@Overridepublic void onNext(List<Contact> contacts) {adapter.addAll(contacts);}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.menu_main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();//noinspection SimplifiableIfStatementif (id == R.id.action_settings) {return true;}return super.onOptionsItemSelected(item);}class MyAdapter extends BaseAdapter {List<Contact> mContacts = new ArrayList<>();public void addAll(List<Contact> contacts){mContacts.addAll(contacts);notifyDataSetChanged();}@Overridepublic int getCount() {return mContacts.size();}@Overridepublic Object getItem(int i) {return i;}@Overridepublic long getItemId(int i) {return i;}@Overridepublic View getView(int i, View view, ViewGroup viewGroup) {View holder = view;if(holder == null){holder = getLayoutInflater().inflate(R.layout.list_item, viewGroup, false);}Contact contact = mContacts.get(i);if(contact != null) {((TextView) holder.findViewById(R.id.name)).setText(contact.name);((TextView) holder.findViewById(R.id.number)).setText(contact.number);}return holder;}}class Contact{String name;String number;}}
