android如何获取手机联系人的数据库示例代码

package com.example.song.lx_day14_contacts; 
 
import android.content.ContentResolver; 
import android.database.Cursor; 
import android.net.Uri; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.widget.ListView; 
import android.widget.SimpleAdapter; 
import android.widget.TextView; 
 
import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
 
/** 
 * 获取手机通讯录信息 展示并且修改 
 * listview 
 * simpleadapter 
 * list> 
 */ 
public class MainActivity extends AppCompatActivity { 
  private String uri_raw = "content://com.android.contacts/raw_contacts"; 
  //直接获取data表中的 数据类型是phone 
  private String uri_phone = "content://com.android.contacts/data/phones"; 
  //直接获取data表中数据类型是emali 
  private String uri_emalis = "content://com.android.contacts/data/emails"; 
  private String uri_data = "content://com.android.contacts/data"; 
  private ListView listView; 
  private TextView empty; 
  private SimpleAdapter adapter; 
  private List> data = new ArrayList<>(); 
  private ContentResolver contentResolver;//用来访问数据 
 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    listView = ((ListView) findViewById(R.id.lv)); 
    empty = ((TextView) findViewById(R.id.empty)); 
    listView.setEmptyView(empty);//设置空视图 
    adapter = new SimpleAdapter(this, data, R.layout.item, new String[]{"_id", "display_Name", "data1"}, new int[]{R.id.id, R.id.name, R.id.number}); 
    listView.setAdapter(adapter); 
    contentResolver = getContentResolver(); 
    reloadListView(); 
  } 
 
  private void reloadListView() { 
    data.clear(); 
    data.addAll(selectData()); 
    adapter.notifyDataSetChanged(); 
 
  } 
 
  //查询工作 用于查询data raw_contact标 返回list数据 在刷新adapter 
  private List> selectData() { 
    /** 
     * 1.先查询raw 获取_id查出所有联系人 
     * 2.循环查询-->根据_id去data表中（_id=raw_contacts_id）查询 data1数据 
     */ 
    Cursor cursor = contentResolver.query(Uri.parse(uri_raw), new String[]{"_id", "display_name"}, null, null, null); 
    //cursor返回的cursor数量不定 
    List> list = new ArrayList<>(); 
    while (cursor != null && cursor.moveToNext()) { 
      String _id = cursor.getString(0); 
      String displayName = cursor.getString(1); 
      Map map = new HashMap<>(); 
      map.put("_id", _id); 
      map.put("display_Name", displayName); 
      //根据_id 去data查手机号 
      Cursor cursor1 = contentResolver.query(Uri.parse(uri_phone), new String[]{"data1"}, "raw_contact_id=?", new String[]{_id}, null); 
      //循环拿到手机号 
      StringBuffer sb = new StringBuffer(); 
      //这里循环拿到手机号是因为有时联系人中 你可能一个人有几个电话 
      while (cursor1 != null && cursor1.moveToNext()) { 
        sb.append(cursor1.getString(0) + "\n"); 
      } 
      cursor1.close(); 
      map.put("data1", sb.toString()); 
      list.add(map); 
    } 
    cursor.close(); 
    return list; 
  } 
}