Android学习笔记（7）-读取系统联系人

1.activity_contact.xml布局文件，ListView控件用来展示系统联系人列表：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ListView
        android:id="@+id/contacts_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </ListView>
</LinearLayout>

2.ContactActivity.java文件：

package com.imooc.lightsensortest;

import android.database.Cursor;
import android.provider.ContactsContract;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

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

public class ContactActivity extends AppCompatActivity {
    ListView contactsView;

    ArrayAdapter<String>adapter;

    List<String> contactList=new ArrayList<String>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_contact);
        contactsView=(ListView)findViewById(R.id.contacts_view);
        adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,contactList);
        contactsView.setAdapter(adapter);
        readContacts();
    }
    //读取系统联系人
    private void readContacts(){
        Cursor cursor=null;
        try {
            //查询系统联系人
            cursor=getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null,null,null,null);
            while (cursor.moveToNext()){
                //获取联系人姓名
                String displayName=cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
                //获取联系人手机号
                String number=cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                contactList.add(displayName+"\n"+number);
            }
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            if(cursor!=null){
                cursor.close();//将Cursor对象关闭
            }
        }
    }
}

3.AndroidManifest.xml文件中加入读取系统联系人的权限配置：

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