安卓开发：获取手机通讯录信息

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

package com.contentprovide.liuliu.test_9_12_01;

import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

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

public class MainActivity extends AppCompatActivity {

    ListView mylist;

    List<HashMap<String, String>> list;
    HashMap<String, String> hash;

    Cursor cursor;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mylist = (ListView) findViewById(R.id.list);
        list = new ArrayList();
        
//        实例化数据库指针
        cursor = this.getContentResolver().
                query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);

//        获取本地通讯录信息，并通过键值对的方式放进ArrayList数组中
        while (cursor.moveToNext()) {

            String get_name = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
            String get_number = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));

            hash = new HashMap<>();
            hash.put("h_name", get_name);
            hash.put("h_number", get_number);

            list.add(hash);
        }

        mylist.setAdapter(new MyAdapter());

    }

//    适配器
    class MyAdapter extends BaseAdapter {

        @Override
        public int getCount() {
            return list.size();
        }

        @Override
        public Object getItem(int i) {
            return i;
        }

        @Override
        public long getItemId(int i) {
            return i;
        }

        @Override
        public View getView(int i, View view, ViewGroup viewGroup) {

            Myholder myholder;

            if (view == null) {
                view = LayoutInflater.from(getApplicationContext()).inflate(R.layout.item, null);
                myholder = new Myholder();

                myholder.myname = view.findViewById(R.id.name);
                myholder.mynumber = view.findViewById(R.id.number);

                view.setTag(myholder);

            } else {

                myholder = (Myholder) view.getTag();

            }


            myholder.myname.setText(list.get(i).get("h_name"));
            myholder.mynumber.setText(list.get(i).get("h_number"));


            return view;


        }

        class Myholder {
            TextView myname;
            TextView mynumber;
        }
    }


}