Android利用ContentProvider获取联系人信息

package com.example.administrator.myapplication;

import android.content.ContentResolver;
import android.database.Cursor;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleAdapter;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;


public class MainActivity extends AppCompatActivity {

    private ContentResolver cr;
    private List<Map<String,Object>> data;
    private ListView lv_main_list;
    private SimpleAdapter simpleAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lv_main_list = (ListView)findViewById(R.id.lv_main_list);

        //获取内容访问者
        cr = getContentResolver();

        data = new ArrayList<Map<String,Object>>();
        //适配器
        simpleAdapter = new SimpleAdapter(this,data,android.R.layout.simple_list_item_2,new String[]{"names","phones"},new int[]{android.R.id.text1,android.R.id.text2});
        lv_main_list.setAdapter(simpleAdapter);
    }

    public void getContacts(View view){
        Cursor cursor=cr.query(Uri.parse("content://com.android.contacts/raw_contacts"),null,null,null,null);
        while(cursor.moveToNext()){
            Map<String,Object> map=new HashMap<String,Object>();
            int id=cursor.getInt(cursor.getColumnIndex("_id"));
            String displayName=cursor.getString(cursor.getColumnIndex("display_name"));
            Log.i("test",id+" "+displayName);
            map.put("names",displayName);

            //根据联系人获取联系人数据
            Cursor cursor2=cr.query(Uri.parse("content://com.android.contacts/raw_contacts/"+id+"/data"),null,null,null,null);
            while(cursor2.moveToNext()){
              //  int type=cursor2.getInt(cursor2.getColumnIndex("mimetype_id"));
                String type=cursor2.getString(cursor2.getColumnIndex("mimetype"));
                String data1=null;
                if ("vnd.android.cursor.item/phone_v2".equals(type)){
                    data1 = cursor2.getString(cursor2.getColumnIndex("data1"));
                    Log.i("test","   "+type+" "+data1);
                    map.put("phones",data1);
                }
            }
            data.add(map);
        }
        //通知适配器发生改变
        simpleAdapter.notifyDataSetChanged();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="Http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.example.administrator.myapplication.MainActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="获取所有的联系人"
        android:onClick="getContacts"
        />
    <ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/lv_main_list"

        ></ListView>
</LinearLayout>

<uses-permission android:name="android.permission.READ_CONTACTS" />