android如何获取手机联系人的数据库

很多人在做手机联系人的apk时会遇到，如何获取手机联系人数据库的问题，在这里我就简单的将代码写一下
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;    }}
在这里不要忘记了添加权限
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