Android开发学习：[21]安卓查询联系人和电话

1、首先我们打开我们下载安装好的android studio，然后新建一个工程如下

2、然后我们在layout下面对app界面进行布局编写<RelativeLa鲻戟缒男yout xmlns:android="http://sch髫潋啜缅emas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context="com.basillee.asus.demo.MainActivity2"> <TextView android:id="@+id/result" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="25dp" android:textColor="@android:color/black" /></RelativeLayout>效果如design视图如下：

3、然后我们编写后台代码如下：package com.basillee.asus.蟠校盯昂demo;import an颊俄岿髭droid.content.ContentResolver;import android.database.Cursor;import android.os.Bundle;import android.provider.ContactsContract;import android.support.v7.app.ActionBarActivity;import android.widget.TextView;public class MainActivity2 extends ActionBarActivity { private String[]columns={ ContactsContract.Contacts._ID, ContactsContract.Contacts.DISPLAY_NAME, ContactsContract.CommonDataKinds.Phone.NUMBER , ContactsContract.CommonDataKinds.Phone.CONTACT_ID}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main_activity2); TextView textView= (TextView) findViewById(R.id.result); textView.setText(getQueryData()); } private String getQueryData() { StringBuilder stringBuilder=new StringBuilder(); ContentResolver resolver=getContentResolver(); Cursor cursor=resolver.query(ContactsContract.Contacts.CONTENT_URI,null,null,null,null); while(cursor.moveToNext()){ int idIndex=cursor.getColumnIndex(columns[0]); int displayNameIndex=cursor.getColumnIndex(columns[1]); int id=cursor.getInt(idIndex); String disPlayName=cursor.getString(displayNameIndex); Cursor phone=resolver.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null,columns[3]+"="+id,null,null); while(phone.moveToNext()){ int phoneNumberIndex=phone.getColumnIndex(columns[2]); String phoneNumber=phone.getString(phoneNumberIndex); stringBuilder.append(disPlayName+";"+phoneNumber+"\n"); } } cursor.close(); return stringBuilder.toString(); }}

4、写完之后我们要记得在androidmainifast.xml添加应用权限<uses-permission android:name="android.permission.READ_CONTACTS"></uses-permission>

5、然后我们运行此项目，点击上面的运行按钮

6、然后我们可以看到结果如下，显示了模拟器里面的联系人姓名和电话号码